Willow B. English

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BACKGROUND Geolocators are useful for tracking movements of long-distance migrants, but potential negative effects on birds have not been well studied. We tested for effects of geolocators (0.8-2.0 g total, representing 0.1-3.9 % of mean body mass) on 16 species of migratory shorebirds, including five species with 2-4 subspecies each for a total of 23 study(More)
Fisher’s sex ratio theory predicts that on average parents should allocate resources equally to the production of males and females. However, when the cost/benefit ratio for producing males versus females differs, the theory predicts that parents may bias production, typically through underproduction of the sex with greater variation in fitness. We tested(More)
Predators are the main cause of nest failure in groundnesting birds, including shorebirds (Angelstam 1986). Increasing nest success by reducing predation can be desirable for conservation reasons, or for pursuing research questions that require successful nests (Schamel et al. 2004, Smith et al. 2011). Predation control must consider effectiveness, cost,(More)
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