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Providing evidence to improve practice

Individual study: Impact on nesting Cory's shearwaters Calonectris diomedea of eradication of introduced house mice Mus musculus and European rabbits Oryctolagus cuniculus from Selvagem Grande, Selvagens Islands, Portugal

Published source details

Zino F., Hounsome M.V., Buckle A.P. & Biscoito M. (2008) Was the removal of rabbits and house mice from Selvagem Grande beneficial to the breeding of Cory's shearwaters Calonectris diomedea borealis? Oryx, 42, 151-154


This study is summarised as evidence for the intervention(s) shown on the right. The icon shows which synopsis it is relevant to.

Control or remove habitat-altering mammals Bird Conservation

A before-and-after study on Selvagem Grande (2.45 km2), Madeira Archipelago, Portugal (Zino et al. 2008), found that the breeding success and productivity of Cory’s shearwaters Calonectris diomedia borealis was significantly higher in 2002-6 (54-56% of 2,075 nests producing fledglings), following the eradication of European rabbits Oryctolagus cuniculus and house mice Mus musculus (a potential predator) than in 13 years during 1982-2001, before eradication (36-45% of 4,952 nests producing fledglings). Eradications were simultaneous, through the application of brodifacoum in July-September 2002 and it was not, therefore, possible to determine which species was constraining the shearwater population. The authors argue that because of the timing of the eradications and the instantaneous impact on productivity, the two species must have been impacting on chick, rather than egg survival.

 

Control mammalian predators on islands for seabirds Bird Conservation

A before-and-after study on Selvagem Grande (245 ha), Madeira Archipelago, Portugal (Zino et al. 2008), found that breeding success and productivity of Cory’s shearwaters Calonectris diomedia borealis was significantly higher, following the eradication of rabbits Oryctolagus cuniculus and house mice Mus musculus from the island. This paper is discussed in detail in ‘Control or remove habitat-altering mammals’.