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Aerobic power and flight capacity in birds: a phylogenetic test of the heart-size hypothesis
University of Austral Chile, Chile; University of Catolica Chile, Chile.
University of Catolica Chile, Chile; University of Bernardo OHiggins, Chile.
University of Austral Chile, Chile.
Linköping University, Department of Physics, Chemistry and Biology. Linköping University, Faculty of Science & Engineering.
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2018 (English)In: Journal of Experimental Biology, ISSN 0022-0949, E-ISSN 1477-9145, Vol. 221, no 1, article id UNSP jeb175208Article in journal (Refereed) Published
Abstract [en]

Flight capacity is one of the most important innovations in animal evolution; it only evolved in insects, birds, mammals and the extinct pterodactyls. Given that powered flight represents a demanding aerobic activity, an efficient cardiovascular system is essential for the continuous delivery of oxygen to the pectoral muscles during flight. It is well known that the limiting step in the circulation is stroke volume (the volume of blood pumped from the ventricle to the body during each beat), which is determined by the size of the ventricle. Thus, the fresh mass of the heart represents a simple and repeatable anatomical measure of the aerobic power of an animal. Although several authors have compared heart masses across bird species, a phylogenetic comparative analysis is still lacking. By compiling heart sizes for 915 species and applying several statistical procedures controlling for body size and/or testing for adaptive trends in the dataset (e.g. model selection approaches, phylogenetic generalized linear models), we found that (residuals of) heart size is consistently associated with four categories of flight capacity. In general, our results indicate that species exhibiting continuous hovering flight (i.e. hummingbirds) have substantially larger hearts than other groups, species that use flapping flight and gliding show intermediate values, and that species categorized as poor flyers show the smallest values. Our study reveals that on a broad scale, routine flight modes seem to have shaped the energetic requirements of birds sufficiently to be anatomically detected at the comparative level.

Place, publisher, year, edition, pages
COMPANY OF BIOLOGISTS LTD , 2018. Vol. 221, no 1, article id UNSP jeb175208
Keywords [en]
Comparative phylogenetics; Cardiovascular system; Stroke volume; Aves; Ornstein-Uhlenbeck models
National Category
Zoology
Identifiers
URN: urn:nbn:se:liu:diva-144563DOI: 10.1242/jeb.162693ISI: 000419924000002PubMedID: 29150450OAI: oai:DiVA.org:liu-144563DiVA, id: diva2:1178285
Note

Funding Agencies|Fondo Nacional de Desarrollo Cientifico y Tecnologico [1130750, 11160271]; Linkopings Universitet; Svenska Forskningsradet Formas; Direccion General de Investigacion Cientifica y Tecnica [CGL2012-36345]; Comision Nacional de Investigacion Cientifica y Tecnologica

Available from: 2018-01-29 Created: 2018-01-29 Last updated: 2018-02-21

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The full text will be freely available from 2018-11-17 15:43
Available from 2018-11-17 15:43

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