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      Drivers of wing shape in a widespread Neotropical bird: a dual role of sex-specific and migration-related functions

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          Linear Discrimination, Ordination, and the Visualization of Selection Gradients in Modern Morphometrics

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            Protandrous arrival timing to breeding areas: a review

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              Tropical birds have a slow pace of life.

              Tropical birds are relatively long-lived and produce few offspring, which develop slowly and mature relatively late in life, the slow end of the life-history axis, whereas temperate birds lie at the opposite end of this continuum. We tested the hypothesis that tropical birds have evolved a reduced basal metabolic rate (BMR). We measured BMR of 69 species of tropical birds, the largest data set amassed on metabolic rates of tropical birds, and compared these measurements with 59 estimates of BMR for temperate birds. Our analyses included conventional least squares regression, regressions based on phylogenetic independent contrasts, and a comparison of BMR of 13 phylogenetically matched pairs, one species from the tropics and one from northerly temperate areas. Our triptych showed that tropical birds had a reduced BMR, compelling evidence for a connection between the life history of tropical birds and a slow pace of life. Further, tropical migrants breeding in temperate habitats had a lower BMR than did temperate residents, suggesting that these migrants have physiological traits consistent with a slow pace of life. In addition, we determined that tropical birds had a lower cold-induced peak metabolic rate and thermogenic metabolic scope than temperate species, a finding that is consistent with the hypothesis that their environment has not selected for high levels of thermogenesis, or alternatively, that a slow pace of life may be incompatible with high thermogenic capacity. We conclude that physiological function correlates with the suite of life-history traits.
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                Author and article information

                Journal
                Evolutionary Ecology
                Evol Ecol
                Springer Science and Business Media LLC
                0269-7653
                1573-8477
                August 2018
                July 11 2018
                August 2018
                : 32
                : 4
                : 379-393
                Article
                10.1007/s10682-018-9945-4
                © 2018

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