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Toad's tongue for breakfast : exploitation of a novel prey type, the invasive cane toad, by scavenging raptors in tropical Australia

journal contribution
posted on 2011-06-01, 00:00 authored by Christa BeckmannChrista Beckmann, R Shine
Although interest in the ecological impacts of invasive species has largely focused on negative effects, some native taxa may benefit from invader arrival. In tropical Australia, invasive cane toads (Bufo marinus) have fatally poisoned many native predators (e.g., marsupials, crocodiles, lizards) that attempt to ingest the toxic anurans, but birds appear to be more resistant to toad toxins. We quantified offtake of dead (road-killed) cane toads by raptors (black kites (Milvus migrans) and whistling kites (Haliastur sphenurus)) at a site near Darwin, in the Australian wet-dry tropics. Raptors readily took dead toads, especially small ones, although native frogs were preferred to toads if available. More carcasses were removed in the dry season than the wet season, perhaps reflecting seasonal availability of alternative prey. Raptors appeared to recognize and avoid bufotoxins, and typically removed and consumed only the toads’ tongues (thereby minimizing toxin uptake). The invasion of cane toads thus constitutes a novel prey type for scavenging raptors, rather than (as is the case for many other native predators) a threat to population viability.

History

Journal

Biological invasions

Volume

13

Issue

6

Pagination

1447 - 1455

Publisher

Springer Netherlands

Location

Dordrecht, The Netherlands

ISSN

1387-3547

eISSN

1573-1464

Language

eng

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2010, Springer Science+Business Media B.V.