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• W102585364 abstract "An animal’s life history traits and its underlying management of resources are an outcome of competition for resources and risk of predation and how this might change over time. Because tropical birds are not subject to a severe cold winter period with low food availability, they were assumed to have life history traits differing from that of temperate birds. However, tropical climates are characterised by a strong seasonality of rainfall, which in turn might be associated with fluctuations in food abundance, especially granivorous food. It is thus not clear that tropical birds are freed from the constraints of seasonal variance in the risk of starvation. Studies carried out on birds in temperate regions have revealed that during periods of increased starvation risk birds (i) gain more mass as a result of depositing fat reserves, (ii) feed earlier in the day, (iii) show more risk taking behaviour by feeding more often in risky areas (iv), show higher levels of competitive interactions as individuals converge on limited remaining food patches and use provided food more readily and (v) show strongly seasonal periods of breeding and moult coincident with high availability of food resources. If there is seasonal variability of starvation risk in tropical areas, this should then be reflected in similar patterns of resource management and behaviour. We tested these predictions in tropical granivorous bird species inhabiting savannah habitat in central Nigeria. We predicted fat reserves and mass, risk taking behaviour, use of provided food patches and competitive interactions to peak, group size to be smallest and breeding and moult not to occur during the rainy season when food availability is expected to be lowest. During the early rainy season birds (i) deposited more fat and gained more mass but this was lost during the late rainy season and remained at roughly similar levels throughout the dry season in most species. Depletion rates of artificial feeding patches differing in predation risk revealed that birds (ii) fed more in the morning than in the afternoon during" @default.
• W102585364 created "2016-06-24" @default.
• W102585364 creator A5021845356 @default.
• W102585364 date "2007-06-01" @default.
• W102585364 modified "2023-09-23" @default.
• W102585364 title "Trade-offs between the risks of predation and starvation in subtropical granivorous finches" @default.
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