Life history predicts flight muscle phenotype and function in birds

Shane DuBay, Yongjie Wu, Graham Scott, Yanhua Qu, Qiao Liu, Joel Smith, Chao Xin, Andrew Hart Reeve, Chen Juncheng, Dylan Meyer, Jing Wang, Jacob Johnson, Zachary Cheviron, Fumin Lei & John Bates
1. Functional traits are the essential phenotypes that underlie an organism’s life history and ecology. Although biologists have long recognized that intraspecific variation is consequential to an animals’ ecology, studies of functional variation are often restricted to species-level comparisons, ignoring critical variation within species. In birds, interspecific comparisons have been foundational in connecting flight muscle phenotypes to species-level ecology, but intraspecific variation has remained largely unexplored. 2. We asked how age- and sex-dependent demands on...
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These counts follow the COUNTER Code of Practice, meaning that Internet robots and repeats within a certain time frame are excluded.
What does this mean?