Although reproductive strategies can be influenced by a variety of intrinsic and extrinsic
factors, life history theory provides a rigorous framework for explaining variation in …

Animals need to adjust reproductive decisions to environmental seasonality. In contrast to
species from the well-studied temperate zones, little is known for tropical birds about the …

Migration, broadly defined as directional movement to take advantage of spatially distributed
resources, is a dramatic behaviour and an important component of many life histories that …

Many tropical birds breed seasonally, but it is largely unknown which environmental cues
they use to time reproduction. Changes in tropical photoperiod have been regarded as too …

Publisher Summary This chapter gives an overview of the consequences of photoperiodic
responsiveness for the adaptability of birds to human-caused environmental change. It …

In changing environments, birds time reproduction to optimize survival of young (eg,
Wingfield, 1983; Perrins, 1970; Lack, 1968). Selective features of the environment (ultimate …

Global warming is predicted to adversely affect the reproduction of birds, especially in
northern latitudes. A recent study in Finland inferred that declining populations of black …

Crossbills (genus Loxia) are thought to breed opportunistically whenever food is abundant. If
strictly true, this would distinguish them from most temperate zone birds that use photoperiod …

Birds show pronounced seasonal breeding at all latitudes, and many are able to predict and
prepare for a forthcoming breeding opportunity, thereby maximizing reproductive potential …

In seasonally unpredictable habitats, organisms cannot anticipate and prepare for a regular
yearly reproductive period. Therefore, they opportunistically breed at any time of year …