Cane toad

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For other uses, see Cane toads (disambiguation).

Cane toad

An adult cane toad, brown in colour, displaying the unwebbed front feet, webbing on the back feet, and large parotoid glands on the side of the head.

Conservation status


Least Concern (IUCN 3.1)[1]

Scientific classification

Kingdom:
Animalia

Phylum:
Chordata

Class:
Amphibia

Order:
Anura

Family:
Bufonidae

Genus:
Bufo

Subgenus:
Rhinella

Species:
B. marinus

Binomial name

Bufo marinus
(Linnaeus, 1758)

Distribution of the cane toad. Native distribution in blue, introduced in red.

Synonyms

Rhinella marinus[2]
Chaunus marinus[2]

The cane toad (Bufo marinus), also known as the Giant Neotropical Toad or Marine Toad, is a large, terrestrial true toad native to Central and South America, but has since been introduced to various islands throughout Oceania and the Caribbean. It is a member of the subgenus Rhinella of the genus Bufo, which includes many different true toad species found throughout Central and South America. The cane toad is a prolific breeder; females lay single-clump spawns with thousands of eggs. Its reproductive success is partly because of opportunistic feeding: it has a diet, unusual among Anurans, of both dead and living matter. Adults average 10–15 cm (3.9–5.9 in) in length; the largest recorded specimen weighed 2.65 kilograms (5.8 lb) with a length of 38 cm (15 in) from snout to vent.

The cane toad has poison glands, and the tadpoles are highly toxic to most animals if ingested. Because of its voracious appetite, the cane toad has been introduced to many regions of the Pacific and the Caribbean islands as a method of agricultural pest control. The species derives its common name from its use against the cane beetle (Dermolepida albohirtum). The cane toad is now considered a pest and aninvasive species in many of its introduced regions; of particular concern is that its toxic skin kills many animals—native predators and otherwise—when ingested.

Contents

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[edit]Taxonomy

Originally, cane toads were used to eradicate pests from sugarcane, giving rise to their common name. The cane toad has many other common names, including "Giant Toad" and "Marine Toad"; the former refers to its size and the latter to the binomial name, Bufo marinus. It was one of many species described by Linnaeus in his 18th-century work Systema Naturae (1735).[3] Linnaeus based the specific epithet marinus on an illustration by Dutch zoologist Albertus Seba, who mistakenly believed the cane toad to inhabit both terrestrial and marine environments.[4] Other common names include "Giant Neotropical Toad",[5] "Dominican Toad",[6] "Giant Marine Toad",[7] and "South American Cane Toad".[8] In Trinidadian English they are commonly called "Crapaud".[9]

A large, adult cane toad, showing the light colouration that is present in some specimens of the species.

A lightly coloured cane toad

In Australia, the adults may be confused with large native frogs from the genera Limnodynastes, Cyclorana and Mixophyes. These species can be distinguished from the cane toad by the absence of large parotoid glands behind their eyes and the lack of a ridge between the nostril and the eye.[10] Cane toads have been confused with theGiant Burrowing Frog (Heleioporus australiacus), because both are large and warty in appearance; however, the latter can be readily distinguished from the former by its vertical pupils and its silver-grey (as opposed to gold) iris.[11] Juvenile cane toads may be confused with species of the Uperoleia genus, but their adult colleagues can be distinguished by the lack of bright colouring on the groin and thighs.[12]

In the United States, the cane toad closely resembles many Bufonid species. In particular, it could be confused with the Southern toad (Bufo terrestris), which can be distinguished by the presence of two bulbs in front of the parotoid glands.[13]

[edit]Description

A juvenile cane toad, showing many of the features of the adult toads, but without the large parotoid glands.

A young cane toad (Bufo marinus)

The cane toad is very large;[14] the females are significantly longer than males,[15] reaching an average length of 10–15 cm (3.9–5.9 in).[14] "Prinsen", a toad kept as a pet in Sweden, is listed by the Guinness Book of Records as the largest recorded specimen. It reportedly weighed 2.65 kilograms (5.84 lb) and measured 38 cm (15 in) from snout to vent, or 54 cm (21 in) when fully extended.[16] Larger toads tend to be found in areas of lower population density.[17] They have a life expectancy of 10 to 15 years in the wild,[18] and can live considerably longer in captivity, with one specimen reportedly surviving for 35 years.[19]

The skin of the cane toad is dry and warty.[14] It has distinct ridges above the eyes, which run down the snout.[10] Individual cane toads can be grey, yellowish, red-brown or olive-brown, with varying patterns.[20] A large parotoid gland lies behind each eye.[14] The ventral surface is cream-coloured and may have blotches in shades of black or brown. The pupils are horizontal and the irises golden.[11] The toes have a fleshy webbing at their base,[14] and the fingers are free of webbing.[20]

The juvenile cane toad is much smaller than the adult cane toad at 5–10 cm (2.0–3.9 in) long. Typically, they have smooth, dark skin, although some specimens have a red wash. Juveniles lack the adults’ large parotoid glands, so they are usually less poisonous.[17] The tadpoles are small and uniformly black, and are bottom-dwellers, tending to form schools.[21] Tadpoles range from 10 to 25 mm (0.39 to 0.98 in) in length.[22]

[edit]Ecology, behaviour and life history

The common name "Marine Toad" and the scientific name Bufo marinus suggest a link to marine life,[23] but the adult cane toad is entirely terrestrial, only venturing to freshwater to breed. Tadpoles have been found to tolerate salt concentrations equivalent to at most 15% that of seawater.[24] The cane toad inhabits open grassland and woodland, and has displayed a "distinct preference" for areas that have been modified by humans, such as gardens and drainage ditches.[25] In their native habitats, the toads can be found in subtropical forests,[22] although dense foliage tends to limit their dispersal.[26]

The cane toad begins life as an egg, which is laid as part of long strings of jelly in water. A female lays 8,000–25,000 eggs at once and the strings can stretch up to 20 metres (66 ft) in length.[23] The black eggs are covered by a membrane and their diameter is approximately 1.7–2.0 mm (0.067–0.079 in).[23] The rate at which an egg evolves into a tadpole is dependent on the temperature: the pace of development increases with temperature. Tadpoles typically hatch within 48 hours, but the period can vary from 14 hours up to almost a week.[23] This process usually involves thousands of tadpoles—which are small, black and have short tails—forming into groups. It takes between 12 and 60 days for the tadpoles to develop into toadlets, with four weeks being typical.[23] Similarly to their adult counterparts, eggs and tadpoles are toxic to many animals.[14]

When they emerge, toadlets typically are about 10–11 mm (0.39–0.43 in) in length, and grow rapidly. While the rate of growth varies by region, time of year and gender, Zug and Zug found an average initial growth rate of 0.647 mm (0.0255 in) per day, followed by an average rate of 0.373 mm (0.0147 in) per day. Growth typically slows once the toads reach sexual maturity.[27] This rapid growth is important for their survival—in the period between metamorphosis and sub–adulthood, the young toads lose the toxicity that protected them as eggs and tadpoles, but have yet to fully develop the parotoid glands that produce bufotoxin.[28] Because they lack this key defence, it is estimated that only 0.5% of cane toads reach adulthood.[17][29]

As with rates of growth, the point at which the toads become sexually mature varies across different regions. In New Guinea, sexual maturity is reached by female toads with a snout–vent length of between 70 and 80 mm (2.8 and 3.1 in), while toads inPanama achieve maturity when they are between 90 and 100 mm (3.5 and 3.9 in) in length.[30] In tropical regions, such as their native habitats, breeding occurs throughout the year, but in subtropical areas, breeding occurs only during warmer periods that coincide with the onset of the wet season.[31]

The cane toad is estimated to have a critical thermal maximum of 40–42 °C (104–108 °F) and a minimum of around 10–15 °C (50–59 °F).[32] The ranges can change due to adaptation to the local environment.[33] The cane toad has a high tolerance to water loss—one study showed that some can withstand a 52.6% loss of body water, allowing them to survive outside tropical environments.[33]

[edit]Diet

Most frogs identify prey by movement, and vision appears to be the primary method by which the cane toad detects prey; however, the cane toad can also locate food using its sense of smell.[34] They eat a wide range of material; in addition to the normal prey of small rodents, reptiles, other amphibians, birds and a range of invertebrates, they also eat plants, dog food and household refuse. Cane toads have a habit of swallowing their prey.[35]

An adult cane toad with dark colouration, as found in El Salvador. The parotoid gland is prominently displayed on the side of the head.

A specimen of Bufo marinus from El Salvador. The large parotoid glands are visible behind the eyes.

[edit]Defences

The adult cane toad has enlarged parotoid glands behind the eyes, and other glands across their back. When the toads are threatened, their glands secrete a milky-white fluid known as bufotoxin.[36] Components of bufotoxin are toxic to many animals;[37] there have even been human deaths due to the consumption of cane toads.[22]

Bufotenin, one of the chemicals excreted by the cane toad, is classified as a Class 1 drug under Australian law, alongside heroin and cannabis. It is thought that the effects of bufotenin are similar to that of mild poisoning; the stimulation, which includes mild hallucinations, lasts for less than an hour.[38] As the cane toad excretes bufotenin in small amounts, and other toxins in relatively large quantities, toad licking could result in serious illness or death.[39]

In addition to releasing toxin, the cane toad is capable of inflating its lungs, puffing up and lifting its body off the ground to appear taller and larger to a potential predator.[36]

[edit]Predators

Many species prey on the cane toad in its native habitat. These include the Broad-snouted Caiman (Caiman latirostris), the Banded Cat-eyed Snake (Leptodeira annulata), the eel (family: Anguillidae), various species of killifish,[40] the Rock flagtail (Kuhlia rupestris), some species of catfish (order: Siluriformes) and some species of ibis (subfamily: Threskiornithinae).[40] Predators outside the cane toad’s native range include the Whistling Kite (Haliastur sphenurus), the Rakali (Hydromys chrysogaster), the Black Rat (Rattus rattus) and the Water Monitor (Varanus salvator). There have been occasional reports of the Tawny Frogmouth (Podargus strigoides) and the Papuan Frogmouth (Podargus papuensis)[41] feeding on cane toads. It is likely that an opossum of the Didelphis genus can eat cane toads with impunity.[42]

[edit]Distribution

The cane toad is native to the Americas, and its range stretches from the Rio Grande Valley in southern Texas to the central Amazon and south-eastern Peru.[43][44] This area encompasses both tropical and semi-arid environments. The density of the cane toad is significantly lower within its native distribution than in places where it has been introduced. In South America, the density was recorded to be 20 adults per 100 metres (109 yards) of shoreline, 50–100 times lower than the density in Australia.[45]

[edit]Introductions

The cane toad has been introduced to many regions of the world—particularly the Pacific—for the biological control of agricultural pests.[43] These introductions have generally been well-documented, and the cane toad may be one of the most studied of any introduced species.[46]

Before the early 1840s, the cane toad had been introduced into Martinique and Barbados, from French Guiana and Guyana.[47] An introduction to Jamaica was made in 1844 in an attempt to reduce the rat population.[48] Despite its failure to control the rodents, the cane toad was introduced to Puerto Rico in the early 20th century in the hope that it would counter a beetle infestation that was ravaging the sugarcane plantations. The Puerto Rican scheme was successful and halted the economic damage caused by the beetles, prompting scientists in the 1930s to promote it as an ideal solution to agricultural pests.[49]

As a result, many countries in the Pacific region emulated the lead of Puerto Rico and introduced the toad in the 1930s.[50] There are introduced populations in Australia, Florida,[51] Papua New Guinea,[52] the Philippines,[53] the Ogasawara and Ryukyu Islands of Japan,[54] most Caribbean islands,[50] Fiji and many other Pacific islands.[50] including Hawaii[55][56] Since then, the cane toad has become a pest in many host countries, and poses a serious threat to native animals.[57]

[edit]Australia

Main article: Cane toads in Australia

A map of Australia with the cane toad's distribution highlighted. The area follows the north-eastern coast of Australia, ranging from the Northern Territory through to the top end of New South Wales.

Distribution of the cane toad in Australia

Following the apparent success of the cane toad in eating the beetles that were threatening the sugarcane plantations of Puerto Rico, and the fruitful introductions into Hawaii and the Philippines, there was a strong push for the cane toad to be released in Australia to negate the pests that were ravaging the Queensland cane fields.[58] As a result, 102 toads were collected from Hawaii, equally comprising males and females, and brought to Australia.[59] After an initial release in August 1935, the Commonwealth Department of Health decided to ban future introductions until a study was conducted into the feeding habits of the toad. The study was completed in 1936 and the ban lifted, at which point large scale releases were undertaken—by March, 1937, 62,000 toadlets had been released into the wild.[58][59] The toads became firmly established in Queensland, increasing exponentially in number and extending their range into the Northern Territory and New South Wales.[20][59]

However, the toad was generally unsuccessful in reducing the targeted beetles, in part because the cane fields provided insufficient shelter for the predators during the day.[60] Since its original introduction, the cane toad has had a particularly marked effect on Australian biodiversity. The population of a number of native predatory reptiles has declined, such as the varanid lizards Varanus mertensi, V. mitchelli and V. panoptes, the land snakes Pseudechis australis and Acanthophis antarcticus, and the crocodile species Crocodylus johnstoni; in contrast, the population of the agamid lizard Amphibolurus gilberti—known to be a prey item of V. panoptes—has increased.[61]

[edit]Caribbean

The cane toad was introduced to various Caribbean islands to counter a number of pests that were infesting local crops.[62] While it was able to establish itself on some islands, such as Barbados and Jamaica, other introductions, such as in Cuba before 1900 and in 1946, and on the islands of Dominica and Grand Cayman, were unsuccessful.[63]

The earliest recorded introductions were to Barbados and Martinique. The Barbados introductions were focused on the biological control of pests that were damaging the sugarcane crops,[64] and while the toads became abundant, they have not been as successful in controlling the pests as in Australia.[65] The toad was introduced to Martinique from French Guiana before 1944 and became established. Today, they reduce the mosquito and mole cricket populations.[66] A third introduction to the region occurred in 1884, when toads appeared in Jamaica, reportedly imported from Barbados to help control the rodent population. While they had no significant effect on the rats, they nevertheless became well established.[67] Other introductions include the release on Antigua—possibly before 1916, although there are suggestions that this initial population may have died out by 1934 and been reintroduced at a later date—[68] and Montserrat, which saw an introduction before 1879 that led to the establishment of a solid population, which was apparently sufficient to survive the Soufrière Hills volcano eruption in 1995.[69]

In 1920, the cane toad was introduced into Puerto Rico to control the populations of white-grub (Phyllophaga spp.), a sugarcane pest.[70] Before this, the pests were manually collected by humans, so the introduction of the toad eliminated labor costs.[70] A second group of toads was imported in 1923, and by 1932 the cane toad was well established.[71] The population of white-grubs dramatically decreased,[70] and this was attributed to the cane toad at the annual meeting of the International Sugar Cane Technologists in Puerto Rico.[57] However, there may have been other factors.[57] The six-year period after 1931—when the cane toad was most prolific, and the white-grub saw dramatic decline—saw the highest ever rainfall for Puerto Rico.[72]Nevertheless, the assumption was that the cane toad controlled the white-grub; this view was reinforced by a Nature article titled "Toads save sugar crop",[57] and this led to large-scale introductions throughout many parts of the Pacific.[73]

More recently, the cane toad has been spotted in Carriacou and Dominica, the latter appearance occurring in spite of the failure of the earlier introductions.[74]

[edit]Fiji

The cane toad was introduced into Fiji to combat insects that infested sugarcane plantations. The introduction of the cane toad to the region was first suggested in 1933, following the successes in Puerto Rico and Hawaii. After considering the possible side effects, the national government of Fiji decided to release the toad in 1953, and 67 specimens were subsequently imported from Hawaii.[75] Once the toads were established, a 1963 study concluded that as the toad’s diet included both harmful and beneficial invertebrates, it was considered "economically neutral".[56] Today the cane toad can be found on all major islands in Fiji, although they tend to be smaller than their counterparts in other regions.[76]

[edit]New Guinea

The cane toad was successfully introduced into New Guinea to control hawk moth larvae that were eating sweet potato crops.[52] The first release occurred in 1937 using toads imported from Hawaii, with a second release the same year using specimens from the Australian mainland. Evidence suggests there was a third release in 1938, consisting of toads that were being used for human pregnancy tests—many species of toad were found to be effective for this task, and were employed for approximately 20 years after the discovery was announced in 1948.[77][78] Initial reports argued that the toads were effective in reducing the incidence of cutworm and it was suggested that sweet potato yields were improving.[79] As a result, these first releases were followed by further distributions across much of the region,[79] although their effectiveness on other crops, such as cabbages, has been questioned—when the toads were released at Wau, the cabbages provided insufficient shelter and the toads rapidly left the immediate area for the superior shelter offered by the forest.[80] A similar situation had previously arisen in the Australian cane fields, but this experience was either unknown or ignored in New Guinea.[80] The cane toad has since become abundant in rural and urban areas.[81]

[edit]United States

The cane toad naturally exists in southern Texas, but attempts (both deliberate and accidental) have been made to introduce the species to other parts of the country. These include introductions to the mainland state of Florida and to the islands of Hawaii, as well as largely unsuccessful introductions to Louisiana.[82]

Initial releases into Florida failed. Attempted introductions before 1936 and 1944, made with the objective of controlling sugarcane pests, were unsuccessful as the toads failed to proliferate. Later attempts failed in the same way.[83][84] However, the toad gained a foothold in the state after an accidental release by an importer at Miami International Airport in 1957, and deliberate releases by animal dealers in 1963 and 1964 established the toad in other parts of Florida.[84][85] Today, the cane toad is well established in the state, from the Florida Keys to north of Tampa, and they are gradually extending further northward.[86] In Florida, the toad is a regarded as a threat to both native species [87] and to pets,[88] so much so that the Florida Fish and Wildlife Conservation Commission recommends that residents euthanize them.[89]

A selection of cane toad merchandise, including key rings made from their legs, a coin purse made from the head, front limbs and body of a toad, and a stuffed cane toad.

Cane toad merchandise

Around 150 cane toads were introduced to Oahu in Hawaii in 1932, and the population swelled to 105,517 after 17 months.[50] The toads were sent to the other islands, and more than 100,000 toads were distributed by July 1934;[90] eventually over 600,000 were transported.[91]

[edit]Uses

Other than the previously mentioned use as a biological control for pests, the cane toad has been employed in a number of commercial and non-commercial applications. Traditionally, within the toad’s natural range in South America, the Embera-Wounaan would "milk" the toads for their toxin, which was then employed as an arrow poison. There are also suggestions that the toxins may have been used as a narcotic by the Olmec people. The toad has been hunted as a food source in parts of Peru, and eaten after the removal of the skin and parotoid glands.[92] More recently, the toad’s toxins have been used in a number of new ways: bufotenin has been used in Japan as an aphrodisiac and a hair restorer, and in cardiac surgery in China to lower the heart rates of patients.[22]

Other modern applications of the cane toad include pregnancy testing,[92] as pets,[93] laboratory research,[94] and the production of leather goods. Pregnancy testing was conducted in the mid-20th century by injecting urine from a woman into a male toad’s lymph sacs, and if spermatozoa appeared in the toad’s urine, the patient was deemed to be pregnant.[92] The tests using toads were faster than those employing mammals; toads were easier to raise, and, although the initial 1948 discovery employed Bufo arenarum for the tests, it soon became clear that a variety of anuran species were suitable, including the cane toad. As a result, toads were employed in this task for approximately 20 years.[78] As a laboratory animal, the cane toad is regarded as ideal; they are plentiful, and easy and inexpensive to maintain and handle. The use of the cane toad in experiments started in 1950s, and by the end of 1960s, large numbers were being collected and exported to high schools and universities.[94] Since then, a number of Australian states have introduced or tightened importation regulations.[95] Even dead toads have value. Cane toad skin has been made into leather and novelty items;[96][97] stuffed cane toads, posed and accessorised, have found a home in the tourist market,[98] and attempts have been made to produce fertilizer from their bodies.[99]

[edit]Citations

  1. ^ Solis et al. 2008. Database entry includes a range map and justification for this species is of least concern.
  2. ^ a b Crossland, Alford & Shine 2009, p. 626
  3. ^ Linnaeus 1758, p. 824
  4. ^ Beltz 2007
  5. ^ Easteal et al. 1985, p. 185
  6. ^ "Cane Toad (Bufo marinus)". National Invasive Species Information Center. United States Department of Agriculture. June 15, 2009. Retrieved June 17, 2009.
  7. ^ Caughley & Gunn 1996, p. 140
  8. ^ Australian State of the Environment Committee 2002, p. 107
  9. ^ Kenny 2008, p. 35
  10. ^ a b Vanderduys & Wilson 2000, p. 1
  11. ^ a b "Giant Burrowing Frog". Wildlife of Sydney. Australian Museum. April 15, 2009. Retrieved June 17, 2009.
  12. ^ Barker, Grigg & Tyler 1995, p. 381
  13. ^ Brandt & Mazzotti 2005, p. 3
  14. ^ a b c d e f Robinson 1998
  15. ^ Lee 2001, p. 928
  16. ^ Wyse 1997, p. 249
  17. ^ a b c Tyler 1989, p. 117
  18. ^ Tyler 1989, pp. 117–118
  19. ^ Grenard 2007, p. 55
  20. ^ a b c Cameron 2009
  21. ^ Tyler 1976, p. 81
  22. ^ a b c d Invasive Species Specialist Group 2006
  23. ^ a b c d e Tyler 1989, p. 116
  24. ^ Ely 1944, p. 256
  25. ^ Lever 2001, p. 3
  26. ^ Barker, Grigg & Tyler 1995, p. 380
  27. ^ Zug & Zug 1979, pp. 14–15
  28. ^ Zug & Zug 1979, p. 15
  29. ^ Anstis 2002, p. 274
  30. ^ Zug & Zug 1979, p. 8
  31. ^ Lever 2001, p. 6
  32. ^ Tyler 1989, p. 118
  33. ^ a b Tyler 1989, p. 119
  34. ^ Lever 2001, p. 10
  35. ^ Tyler 1989, pp. 130–132
  36. ^ a b Tyler 1989, p. 134
  37. ^ Tyler 1989, pp. 134–136
  38. ^ Fawcett 2004, p. 9
  39. ^ Weil & Davis 1994, pp. 1–8
  40. ^ a b Tyler 1989, p. 138–139
  41. ^ Angus 1994, pp. 10–11
  42. ^ "American possums the solution to cane toads in Australia? – Science Show – 20 March 2010". Abc.net.au. Retrieved 2010-04-26.
  43. ^ a b Tyler 1989, p. 111
  44. ^ Zug & Zug 1979, pp. 1–2
  45. ^ Lampo & De Leo 1998, p. 392
  46. ^ Easteal 1981, p. 94
  47. ^ Easteal 1981, p. 96
  48. ^ Lannoo 2005, p. 417
  49. ^ Tyler 1989, pp. 112–113
  50. ^ a b c d Tyler 1989, pp. 113–114
  51. ^ Smith 2005, pp. 433–441
  52. ^ a b Zug, Lindgrem & Pippet 1975, pp. 31–50
  53. ^ Alcala 1957, pp. 90–96
  54. ^ Kidera et al. 2008, pp. 423–440
  55. ^ Oliver & Shaw 1953, pp. 65–95
  56. ^ a b Hinckley 1963, pp. 253–259
  57. ^ a b c d Tyler 1989, p. 113
  58. ^ a b Tyler 1976, p. 77
  59. ^ a b c Easteal 1981, p. 104
  60. ^ Tyler 1976, p. 83
  61. ^ Doody et al. 2009, pp. 46–53. On snake populations see Shine 2009, p. 20.
  62. ^ Lever 2001, p. 67
  63. ^ Lever 2001, pp. 73–74
  64. ^ Lever 2001, p. 71
  65. ^ Kennedy, Anthony quoted in Lever 2001, p. 72
  66. ^ Lever 2001, p. 81
  67. ^ Lever 2001, pp. 78–79
  68. ^ Easteal 1981, p. 98
  69. ^ Lever 2001, pp. 81–82
  70. ^ a b c Tyler 1989, p. 112
  71. ^ Van Volkenberg 1935, pp. 278–279. "After a completely successful method of killing white grubs by chemical means was found, the only opportunities for its use in Puerto Rico have been limited to small areas in pineapple plantations at elevations where the toad is even yet not present in sufficient abundance."
  72. ^ Freeland 1985, pp. 211–215
  73. ^ Tyler 1989, pp. 113–115
  74. ^ Lever 2001, pp. 72–73
  75. ^ Lever 2001, pp. 128–129
  76. ^ Lever 2001, pp. 130–131
  77. ^ Easteal 1981, p. 103
  78. ^ a b Tyler, Wassersug & Smith 2007, pp. 6–7
  79. ^ a b Lever 2001, p. 118
  80. ^ a b Tyler 1976, pp. 83–84
  81. ^ Lever 2001, p. 119
  82. ^ Easteal 1981, pp. 100–102
  83. ^ Lever 2001, p. 57
  84. ^ a b Easteal 1981, p. 100
  85. ^ Lever 2001, p. 58
  86. ^ Lever 2001, p. 59
  87. ^ "Bufo Marinus @ Florida Wildlife Extension at UF/IFAS". Wec.ufl.edu. Retrieved 2010-04-26.
  88. ^ "Poisonous Bufo May Have Toad Hold On Temple Terrace". .tbo.com. 2007-11-02. Retrieved 2010-04-26.
  89. ^ "WEC 11/UW046: Marine Toads (Bufo marinus)". Edis.ifas.ufl.edu. Retrieved 2010-04-26.
  90. ^ Lever 2001, p. 64
  91. ^ Easteal 1981, p. 101
  92. ^ a b c Lever 2001, p. 32
  93. ^ Mattison 1987, p. 145
  94. ^ a b Tyler 1976, p. 85
  95. ^ Tyler 1976, pp. 88–89
  96. ^ McCarin 2008, p. 8
  97. ^ Hardie 2001, p. 3
  98. ^ Bateman 2008, p. 48
  99. ^ Australian Associated Press 2006

 

Colorado River Toad

From Wikipedia, the free encyclopedia

  (Redirected from Bufo alvarius)

Colorado River Toad

Conservation status


Least Concern (IUCN 3.1)

Scientific classification

Kingdom:
Animalia

Phylum:
Chordata

Class:
Amphibia

Order:
Anura

Family:
Bufonidae

Genus:
Bufo

Species:
B. alvarius

Binomial name

Bufo alvarius
Girard in’ Baird, 1859

Synonyms

Incilius alvarius
(Frost, 2008)

The Colorado River Toad or Bufo alvarius, also known as the Sonoran Desert Toad, is a psychoactive toad found in the Southwestern United States and northern Mexico. The skin and venom of Bufo alvarius contain 5-MeO-DMT and bufotenin.

Contents

[hide]

[edit]Description

Bufo alvarius United States range map (the toad also lives in northwest Mexico).

The Colorado River Toad is carnivorous, eating small rodents, insects, and small reptiles and other toad species; like many toads, they have a long, sticky tongue which aids them in catching prey. It lives in both desert and semi-arid areas throughout the range of its habitat. They are semi-aquatic and are often found in streams, near springs, and incanals and drainage ditches. They often make their home in rodent burrows and are nocturnal. They have a loud,piercing call, which sounds similar to screaming.

The toad generally breeds in small rain pools after the summer showers start; they spend approximately one month as yellowish-brown tadpoles before moving onto the land. They grow to be up to 4-7 inches long.

[edit]Venom and U.S. law

The toad’s primary defense system are glands that produce a poison that may be potent enough to kill a grown dog.[1] These parotoid glands also produce the 5-MeO-DMT [2]and bufotenin for which the toad is known; both of these chemicals belong to the family of hallucinogenic tryptamines. The presence of these substances in the skin and poison of the toad produces psychoactive effects when smoked.[3]

Bufotenine is a Schedule I controlled substance in the United States but possession of the toad is not a crime in itself. In November 2007, a man in Kansas City was arrested and charged with possession of a controlled substance when police discovered B. alvarius toad poison in his possession.[4][5] In Arizona one may legally bag up to ten toads with a fishing license but it could constitute a criminal violation if it can be shown that one is in possession of this toad with the intent to milk and smoke its venom.[6]

It should also be noted that none of the states in which B. alvarius is (or was) indigenous – California, Arizona, and New Mexico – legally allow a person to remove the toad from the state. For example, the Arizona Department of Game and Fish is clear about the law in Arizona: "An individual shall not… export any live wildlife from the state; 3. Transport, possess, offer for sale, sell, sell as live bait, trade, give away, purchase, rent, lease, display, exhibit, propagate… within the state…"[6]

In California, B. alvarius has been designated as "endangered" and possession of this toad is illegal. "It is unlawful to capture, collect, intentionally kill or injure, possess, purchase, propagate, sell, transport, import or export any native reptile or amphibian, or part thereof…"[7]

In New Mexico, this toad is listed as "threatened" and, again, taking B. alvarius is unlawful.[8][9]

[edit]References

  1. ^ Steven J. Phillips, Patricia Wentworth Comus (eds.) (2000). A Natural History of the Sonoran Desert. University of California Press. p. 537. ISBN 0-520-21980-5.
  2. ^ Toxins of Bufo alvarius
  3. ^ http://www.erowid.org/experiences/subs/exp_Toad_Venom.shtml Erowid’s Toad Venom Experience Vault
  4. ^ Kansas City man was arrested for possession of a Bufo Alvarius, Sonoran Desert Toad, Colorado River Toad
  5. ^ Drug sweep yields weed, coke, toad – KCCommunityNews.com
  6. ^ a b http://www.azgfd.gov/pdfs/h_f/regulations/2007-2008ReptileRegulations.pdf
  7. ^ "Title 14. Chapter 5., § 40(a)".
  8. ^ 19.33.6 NMAC
  9. ^ 19.35.10 NMAC
  • Pauly, G. B., D. M. Hillis, and D. C. Cannatella. (2004) The history of a Nearctic colonization: Molecular phylogenetics and biogeography of the Nearctic toads (Bufo). Evolution 58: 2517–2535.
  • Hammerson & Santos-Barrera (2004). Bufo alvarius. 2006. IUCN Red List of Threatened Species. IUCN 2006. www.iucnredlist.org. Retrieved on 12 May 2006. Database entry includes a range map and justification for why this particular species is of least concern
  • Frost, Darrel R., et al.; Grant, Taran; Faivovich, JuliÁN; Bain, Raoul H.; Haas, Alexander; Haddad, CÉLIO F.B.; De SÁ, Rafael O.; Channing, Alan et al. (2006). "The Amphibian Tree of Life". Bulletin of the American Museum of Natural History 297: 1–370. doi:10.1206/0003-0090(2006)297[0001:TATOL]2.0.CO;2.

[edit]External links

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Wikispecies has information related to: Incilius alvarius

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Poison dart frog

From Wikipedia, the free encyclopedia

  (Redirected from Poison frog)

Poison dart frogs (Dendrobatidae)

Dendrobates azureus (top) andDendrobates leucomelas

Scientific classification

Kingdom:
Animalia

Phylum:
Chordata

Class:
Amphibia

Order:
Anura

Suborder:
Neobatrachia

Superfamily:
Dendrobatoidea

Family:
Dendrobatidae
Cope, 1865

Subfamilies and genera

Distribution of Dendrobatidae (in black)

Poison dart frog (also dart-poison frog, poison frog or formerly poison arrow frog) is the common name of a group of frogs in the family Dendrobatidae which are native to Central and South America. Unlike most frogs, these species are active during the day and often exhibit brightly-colored bodies. Although all wild dendrobatids are at least somewhat toxic, levels of toxicity vary considerably from one species to the next and from one population to another. Many species are critically endangered. These amphibians are often called "dart frogs" due to indigenous Amerindians‘ use of their toxic secretions to poison the tips ofblowdarts.[2] In fact, of over 175 species, only three have been documented as being used for this purpose (curare plants are more commonly used), and none come from the Dendrobates genus, which is most characterized by the brilliant color and complex patterns of its members.[3][4]

Contents

[hide]

[edit]Characteristics

Dyeing dart frog (Dendrobates tinctorius).

Most species of poison dart frogs are small, sometimes less than 1.5 centimetres (0.59 in) in adult length, although a few are up to 6 centimetres (2.4 in) in length. They weigh about 2 grams, depending on the size of the frog. Most poison dart frogs are brightly colored, displaying aposematic patterns to warn potential predators. Their bright coloration is associated with their toxicity and levels of alkaloids. Frogs like the ones of Dendrobates species have high levels of alkaloids, whereas the Colostethus species are cryptically colored and are non-toxic.[5] Unlike most other frogs, they are diurnal, rather than being primarily nocturnal or crepuscular.[6]

They lay their eggs in moist places, including on leaves, in plants, among exposed roots, and elsewhere, and allow the tadpoles to wriggle onto their backs shortly after they hatch. They then carry the piggy-backed tadpoles to water, where the larva remain until metamorphosis. The water is typically a pool, but some species use the water gathered in bromeliads or other plants; and some species provide food, supplying the tadpoles with unfertilized eggs to eat.[6]

[edit]Habitat

Poison dart frogs are endemic to humid, tropical environments of Central and Latin America (South America).[3] These frogs are generally found in tropical rainforests, including in Bolivia, Costa Rica, Brazil, Colombia, Ecuador, Venezuela, Suriname, French Guyana, Peru, Panama, Nicaragua and non-native to Hawaii.[3][7]

Natural habitats include subtropical or tropical moist lowland forests, subtropical or tropical high-altitude shrubland, subtropical or tropical moist montanes and rivers, freshwater marshes, intermittent freshwater marshes, lakes and swamps. Other species can be found in seasonally wet or flooded lowland grassland, arable land, pastureland, rural gardens, plantations, moist savanna and heavily degraded former forest. Premontane forests and rocky areas have also been known to hold frogs. Dendrobatids tend to live on or close to the ground, as well as in trees as much as 10 metres (33 ft) from the ground.[8]

[edit]Reproduction

Many species of poison dart frog are dedicated parents. The red-and-blue poison-arrow frog (Dendrobates pumilio) carry their newly hatched tadpoles into the canopy. The tadpoles stick to the mucus on the back of their parents. Once in the upper reaches of the rainforest trees the parents deposit their young in the pools of water that accumulate in epiphytic plants such as bromeliads. The tadpoles feed on invertebrates in their arboreal nursery and their mother will even supplement their diet by depositing eggs into the water. Other poison frogs lay their eggs on the forest floor, hidden beneath the leaf litter. Poison frogs fertilize their eggs externally, that is to say, the female lays a clutch of eggs and a male fertilizes them afterward, in the same manner as most fish (external fertilization). Poison frogs can often be observed clutching each other, similar to the manner most frogs copulate in. However, these demonstrations are actually territorial wrestling matches. Both males and females frequently engage in disputes over territory. A male will fight for the most prominent roosts from which to broadcast his mating call; females fight over desirable nests, and even invade the nests of other females to devour competitor’s eggs.[9]

[edit]Taxonomy

Dart frogs are the focus of major phylogenetic studies, and undergo taxonomic changes frequently.[1] Family Dendrobatidae was revised taxonomically in 2006 and contains 12 genera, with ca. 170 species.[10][11]

[edit]Color morphs

Some poison dart frogs species include a number of conspecific color morphs that emerged as early as 6,000 years ago.[12] Therefore, species such as Dendrobates tinctorius can include color pattern morphs that can be interbred (colors are under polygenic control, while the actual patterns are probably controlled by a single locus).[13] Differing coloration has historically misidentified single species as separate, and there is still controversy among taxonomists over classification.[14]

[edit]Toxicity and medicine

See also: Allopumiliotoxin 267A, Batrachotoxin, Epibatidine, Histrionicotoxin, and Pumiliotoxin 251D

The skin of the phantasmal poison frogcontains epibatidine

Many poison dart frogs secrete lipophilic alkaloid toxins through their skin. Alkaloids in the skin glands of poison frogs serve as a chemical defence against predation, and they are therefore able to be active alongside potential predators during the day. About 28 structural classes of alkaloids are known in poison frogs.[3][15] The most toxic of poison-dart frog species is Phyllobates terribilis. It is argued that dart frogs do not synthesize their poisons, but sequester the chemicals from arthropod prey items, such as ants, centipedes and mites. This is known as the dietary hypothesis.[16] Because of this, captive-bred animals do not contain significant levels of toxins. Despite the toxins used by some poison dart frogs, there are some predators that have developed the ability to withstand them, including the Amazon ground snake (Liophisepinephelus).[17]

Chemicals extracted from the skin of Epipedobates tricolor may be shown to have medicinal value.[18] One such chemical is a painkiller 200 times as potent as morphine, called epibatidine, that has unfortunately demonstrated unacceptable gastrointestinal side effects in humans.[19] Secretions from dendrobatids are also showing promise as muscle relaxants, heart stimulants and appetite suppressants.[20] The most poisonous of these frogs, the Golden Poison Frog (Phyllobates terribilis), has enough toxin on average to kill ten to twenty men or about ten thousand mice.[21] Most other dendrobatids, while colorful and toxic enough to discourage predation, pose far less risk to humans or other large animals.

[edit]Captive care

See also: History of dendrobatid frogkeeping

All species of poison dart frogs are neotropical in origin. Wild-caught specimens can maintain toxicity for some time, so appropriate care should be taken when handling such animals.[22] While there is scant scientific study on the lifespan of poison dart frogs, retagging frequencies indicate it can range from one to three years in the wild.[23] However, these frogs typically live for much longer than that in captivity, having been reported to live as long as 25 years. These claims also seem to be questionable since many of the larger species take a year or more to mature, and Phyllobates species can take more than two years. In captivity, most species thrive where the humidity is kept constant at 80 to 100% and where the temperature is around 72 °F (22 °C) to 80 °F (27 °C) during the day and no lower than 60 °F (16 °C) to 65 °F (18 °C) at night. Some species tolerate lower temperatures better than others.

[edit]Conservation status

Further information: Decline in amphibian populations

Like many frog families, dendrobatids have also been affected by the worldwide decline in amphibian populations. Habitat loss (due to logging and farming) and predation by introduced species are among the more common causes, but the cutaneouschytridiomycosis has struck dart frogs the hardest in the past 25 years.[24] Zoos have tried to counteract this disease by treating captive frogs with an antifungal agent that is used to kill athlete’s foot in humans.[25]

[edit]See also

[edit]References

  1. ^ a b Grant, T., Frost, D. R., Caldwell, J. P., Gagliardo, R., Haddad, C. F. B., Kok, P. J. R., Means, D. B., Noonan, B. P., Schargel, W. E., and Wheeler, W. C. (2006). "Phylogenetic systematics of dart-poison frogs and their relatives (Amphibia: Athesphatanura: Dendrobatidae)". Bulletin of the American Museum of Natural History (American Museum of Natural History) 299 (299): 1–262. doi:10.1206/0003-0090(2006)299[1:PSODFA]2.0.CO;2.
  2. ^ Myers, C. W., J. W. Daly, and B. Malkin (1978). "A dangerously toxic new frog (Phyllobates) used by Embera Indians of western Colombia, with discussion of blowgun fabrication and dart poisoning". Bull. Amer. Mus. Nat. Hist. 161 (2): 307–366.
  3. ^ a b c d "AmphibiaWeb – Dendrobatidae". AmphibiaWeb. Retrieved 2008-10-10.
  4. ^ Heying, H. (2003). "Dendrobatidae". Animal Diversity Web. Retrieved 2008-09-18.
  5. ^ Caldwell, J.P. (1996). "The evolution of myrmecophagy and its correlates in poison frogs (Family Dendrobatidae).". Journal of Zoology 240: 75–101.
  6. ^ a b Zweifel, Robert G. (1998). Cogger, H.G. & Zweifel, R.G.. ed. Encyclopedia of Reptiles and Amphibians. San Diego: Academic Press. pp. 95–97. ISBN 0-12-178560-2.
  7. ^ "Poison Dart Frogs in Hawaii". Explore Biodiversity. Retrieved 2008-10-21.
  8. ^ Kristiina Hurme, Kittzie Gonzalez, Mark Halvorsen, Bruce Foster, and Don Moore (2003). "Environmental Enrichment for Dendrobatid Frogs". Journal of Applied Animal Welfare Science (Lawrence Erlbaum Associates, Inc.) 6 (4): 285–299.doi:10.1207/s15327604jaws0604_3. PMID 14965783.
  9. ^ Piper, Ross (2007), Extraordinary Animals: An Encyclopedia of Curious and Unusual Animals, Greenwood Press.
  10. ^ "Amphibian Species of the World". The American Museum of Natural History. Retrieved 2008-10-10.
  11. ^ F. Harvey Pough … (2004). Herpetology. Upper Saddle River, NJ: Pearson/Prentice Hall. pp. 92. ISBN 0131008498.
  12. ^ Summers, K; Symula, R; Clough, M; Cronin, T (Nov 1999). "Visual mate choice in poison frogs.". Proceedings. Biological sciences / the Royal Society 266 (1434): 2141–5. doi:10.1098/rspb.1999.0900. PMID 10649631.
  13. ^ Summers K., Cronin T. W., Kennedy T. (2004). "Cross-breeding of distinct color morphs of the Strawberry Poison Frog (Dendrobates pumilio) from the Bocas del Toro Archipelago, Panama". Journal of Herpetology 38 (1): 1–8. doi:10.1670/51-03A.
  14. ^ PJR Kok, RD MacCulloch, P Gaucher, EH Poelman, GR Bourne, A Lathrop, GL Lenglet (2006). "A new species of Colostethus (Anura, Dendrobatidae) from French Guiana with a redescription of Colostethus beebei (Noble, 1923) from its type locality".Phyllomedusa 5 (1): 43–66.
  15. ^ Cannatella, David (1995). "Dendrobatidae. Poison-arrow frogs, Dart-poison frogs, Poison-dart frogs". The Tree of Life Project. Retrieved 2008-10-23.
  16. ^ Daly, J.W., Gusovsky, F., Myers, C.W., Yotsuyamashita, M., and Yasumoto, T. (1994). "1st Occurrence of Tetrodotoxin in a Dendrobatid Frog (Colostethus-Inguinalis), with Further Reports for the Bufonid Genus Atelopus.". Toxicon 32: 279–285.
  17. ^ C.W. Myers, J.W. Daly, and B. Malkin (1978). "A dangerously toxic new frog (Phyllobates) used by the Emberá Indians of western Colombia, with discussion of blowgun fabrication and dart poisoning.". Bulletin of the American Museum of natural history 161 (2): pp. 307–365 + color pls. 1–2.
  18. ^ "Science: Potent painkiller from poisonous frog – 30 May 1992 – New Scientist". New Scientist. Retrieved 2008-10-10.
  19. ^ Prince and Sine; Sine, SM (2008). "Epibatidine Activates Muscle Acetylcholine Receptors with Unique Site Selectivity". Biophysical Journal (Biophysical Journal) 75 (4): 1817. doi:10.1016/j.soildyn.2007.11.006. PMID 9746523. PMC 1299853. Retrieved 2008-10-10.
  20. ^ "San Diego Zoo’s Animal Bytes: Poison Frog". Zoological Society of San Diego. Retrieved 2008-10-10.
  21. ^ Most poisonous creature on earth could be a mystery insect
  22. ^ Stefan, Lötters; Jungfer, Henkel, Schmidt (2007). Poison Frogs: Biology, Species, & Captive Husbandry. Serpent’s Tale. pp. 110–136. ISBN 3930612623.
  23. ^ Gray, HM, et al. (2002). "Traumatic Injuries in Two Neotropical Frogs Dendrobates auratus and Physalaemus pustulosus". Journal of Herpetology 36 (1): 117–121. doi:10.1051/forest:19940309.
  24. ^ Daszak P, Berger L, Cunningham AA, Hyatt AD, Green DE, Speare R. (1999). "Emerging infectious diseases and amphibian population declines". Emerg. Infect. Dis. (5): 735–48.
  25. ^ "Poison Dart Frog Fact Sheet – National Zoo| FONZ". Smithsonian National Zoological Park. Retrieved 2008-10-10.

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