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Large-brained birds lay smaller but heavier clutches

Avian Research 2023年第3期14卷 460-466页

作者： Shaobin Li Xiaoman Liu Guopan Li Xiaolong Du College of Life Science Yangtze UniversityJingzhou40025China

The brain is among the most energetically costly organs in vertebrates,and thus trade-offs have been hypothesized to exert constraints on brain size *** energy trade-off hypothesis(ETH) predicts that reducing the energy consumption of reproduction or other costly tissues should compensate for the cost of a large *** production in birds requires a large proportion of the total energy budget,and a clutch mass in some bird species can outweigh the body mass of the *** date,this hypothesis has mainly been tested in mammals and ectothermic animals such as anurans and *** collated data on adult brain size,body mass and eggproduction traits such as clutch size,egg mass and annual broods from published studies,and conducted a phylogenetic comparative test of the interplay between egg-production investment and brain size evolution across bird *** controlling for phylogenetic relationships and body size,we find a negative correlation between brain size and clutch size across 1395 species,which favored ***,when egg mass was integrated in models,positive associations were detected between brain size and mass of eggs(via egg mass,clutch mass and annual total egg mass).Our results suggest that brain size trades off against egg-production only via certain aspects(e.g.,clutch size).By contrast,a positive relationship between brain size and total egg reproduction(e.g.,clutch mass and annual total egg mass) implied increased total energy budget outweighing energy allocation across bird *** study shows that there is no general energy trade-off between brain size and eggreproduction investment,and suggests that brain size evolution follows mixed strategies across bird species.

关键词： Brain size Breeding attempts Clutch size Comparative analysis Egg mass reproduction investment Trade-off

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