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By Navjot S Sodhi; et al

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Hypoleucos) and Eastern Grass-owl (Tyto longimembris) in tropical Australia (Mooney 1998) remain vulnerable to pesticides. 11; Bildstein et al. 1998). Raptors in other tropical regions also remain susceptible. For example, fenthion used to eradicate Red-billed Quelea (Quelea quelea) causes the mortality of raptors when they feed on treated individuals (Keith and Bruggers 1998). The quintessential example of the effects of environmental contaminants on birds comes from tropical vultures. 21; Prakash et al.

1992). After isolation, bird capture rates at least doubled in newly isolated fragments. These elevated bird numbers persisted for about 200 days until population sizes fell below pre-isolation levels (Bierregaard et al. 1992), with the extent of avifaunal collapse being greater in smaller fragments. In the years, decades or even centuries after fragmentation, small patches of remnant habitat are likely to harbor more species than they are capable of maintaining. ” The term “extinction debt” is used to describe the time lag between habitat loss and the local extinction of populations and species (Tilman et al.

Indd 21 1/30/2011 2:40:45 PM 22 Chapter 1 100 Percentage decline 95 G. bengalensis G. 21 The percentage of decline in the number of two vulture species in India. Declines are based on surveys conducted in 1991–1993 and 2000. (Data derived from Prakash et al. ) (organophosphate monocrotphos) extensively used to eliminate grasshoppers (Woodbridge et al. 1995). As a result of pesticide-mediated mortality in wintering grounds, Swainson’s Hawks have been suffering population declines in parts of its breeding range in North America (Sarasola et al.

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