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Effects of brodifacoum on the land crab of Ascension Island
Pain, DJ | Brooke, ML | Finnie, JK | Jackson, A
Journal of Wildlife Management [J. Wildl. Manage.]. Vol. 64, no.
2, pp. 380-387. Apr 2000.
Ascension island and its surrounding islets and seastacks form the
most important breeding place for seabirds in the tropical
Atlantic. As a result of human exploitation and introduced
predators, populations of most seabirds have undergone large-scale
declines since the island's discovery by humans in 1501. Plans to
restore Ascension's seabird colonies have included proposals to
eradicate the introduced rats using island-wide application of the
anticoagulant rodenticide brodifacoum. Assessment of the
feasibility of rodent eradication on this scale requires careful
evaluation of the potential non-target effects. We investigated
the direct effects of brodifacoum upon the native land crab
(Gecarcinus lagostoma), brodifacoum persistence and distribution
in crab tissues, and the potential for secondary effects upon land
crab scavengers and predators, including humans. Land crabs were
fed Talon pellets (20P and 7-20, 0.002% brodifacoum) to simulate
maximum exposure should an island-wide rodent eradication program
take place. Crabs were kept caged in their natural environment for
varying periods of time, and body parts were analyzed for
brodifacoum residues. No crabs appeared to die as a result of
exposure to brodifacoum. Whilst crabs readily ingested Talon
pellets, only low concentrations of brodifacoum were found in
their bodies after exposure ( less than or equal to 0.129 ug/g wet
body tissue). Brodifacoum was not detected within crab claws at
any time, and no residues were detected in any body tissues 1
month following exposure.
 Descriptors: Article Subject Terms Breeding | Introduced species | Islands | Rodenticides | Tropical environment | Article Taxonomic Terms Aves | Gecarcinus lagostoma
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