Literaturdatenbank
Literaturdatenbank |
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Shine, R. (2010). The ecological impact of invasive cane toads (bufo marinus) in australia. Quarterly Review of Biology, 85, 253–291.
Added by: Sarina Wunderlich (30 Jun 2012 22:01:54 UTC) |
| Resource type: Journal Article BibTeX citation key: Shine2010 View all bibliographic details  |
Categories: General Keywords: Amphibien = amphibians, Australien = Australia, Chelidae, Chelodina, Chelodina latisternum, Chelodina rugosa, Echsen = saurians, Habitat = habitat, invasive Arten = invasive species, Panzerechsen = crocodilia, Schildkröten = turtles + tortoises, Schlangen = snakes Creators: Shine Collection: Quarterly Review of Biology |
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| Abstract |
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Turtles sometimes ingest cane toads without ill effects, whereas other predation attempts (even by the same turtle species) can be fatal. Covacevich and Archer (1975) reported that a long-necked turtle (Chelodina sp.) ate a dead cane toad without becoming ill, and Crossland and Alford (1998) reported that saw-shelled turtles (Elseya latisternum) and Krefft’s river turtles (Emydura krefftii) consumed cane toad tadpoles but were unaffected. Hamley and Georges (1985) found toads in the stomachs of four fieldcollected saw-shelled turtles from the Brisbane area. The same authors fed toads to this turtle species in captivity without noting any ill effects, and even maintained two specimens for four months or more on a diet composed exclusively of cane toads. By contrast, there are unsubstantiated reports from Aboriginal communities on Groote Eylandt and the Borroloola region that cane toads have killed ‘goanna, bluetongue, long-necked turtle, geese and everything’ (Evans 1999). Similarly, community members from Beswick and Burunga, south of Katherine, included barramundi and long- and short-necked turtles in their list of species affected by toads (Begg et al. 2000). Scientific studies of toad impacts on taxa such as barramundi (see above) and geese (see below) suggest that these statements may be in error, whereas the statements about goannas and bluetongue lizards are consistent with other evidence (see below). Hence, it is difficult to evaluate the reliability of the statements about turtle mortality. E. Kruger (pers. comm.) has reported dead long-neck turtles (Chelodina rugosa) in waterbodies used by cane toads for breeding. In our experimental studies, long-necked turtles (Chelodina rugosa) seized but rejected toad tadpoles, and survived. However, consumption of toad eggs was fatal (Greenlees and Shine 2009). As is the case for other aquatic predators such as fish, the jelly coat of the egg (which lacks toxicity: Crossland and Shine 2009) may mask the poisons sequestered within the ovum, such that the predator swallows the entire egg mass before detecting its toxic nature.
Added by: Sarina Wunderlich |