A. S. Rashed

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Batesian mimicry occurs when a palatable species (the mimic) gains protection from predators by resembling an unpalatable or otherwise protected species (the model). While some mimetic species resemble their models closely, other species ('imperfect mimics') are thought to bear only a crude likeness. In an earlier study, pigeons (Columba livia) were trained(More)
Although the principles of disruptive colouration are widely believed to explain a variety of animal colour patterns, there has been no field evidence that it works to reduce the detection rates of natural prey. In a recent paper, Cuthill et al. successfully address this shortfall, separating the benefits of background matching from those of disruptive(More)
Prey that are unprofitable to attack (for example, those containing noxious chemicals) frequently exhibit slower and more predictable movement than species that lack these defenses. Possible explanations for the phenomenon include a lack of selection pressure on unprofitable prey to avoid predators and active selection on unprofitable prey to advertise(More)
We test for fitness costs of resistance in a natural host-parasite system, involving Drosophila nigrospiracula and ectoparasitic mites, Macrocheles subbadius. We contrasted rates of mortality at embryonic and pupal stages of host ontogeny between replicate-resistant and -susceptible (control) lines at different temperatures (24, 28, and 34 degrees C).(More)
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