Light conditions and the evolution of the visual system in birds.

Autor:	Fröhlich A; Faculty of Forestry, University of Agriculture in Kraków, Kraków, Poland.; Institute of Nature Conservation, Polish Academy of Sciences, Kraków, Poland., Ducatez S; IRD, ILM, Ifremer, UPF, UMR 241 SECOPOL, Campus d'Outumaoro, Punaauia, Tahiti, French Polynesia., Neˇmec P; Department of Zoology, Faculty of Science, Charles University, Prague, Czech Republic., Sol D; Centre for Ecological Research and Forestry Applications (CREAF), Spanish National Research Council (CSIC), Catalonia, Spain.; Institute of Evolutionary Biology (CSIC-Universitat Pompeu Fabra), Barcelona, Catalonia, Spain.
Jazyk:	angličtina
Zdroj:	Evolution; international journal of organic evolution [Evolution] 2024 Jul 01; Vol. 78 (7), pp. 1237-1247.
DOI:	10.1093/evolut/qpae054
Abstrakt:	Despite vision being an essential sense for many animals, the intuitively appealing notion that the visual system has been shaped by environmental light conditions is backed by insufficient evidence. Based on a comprehensive phylogenetic comparative analysis of birds, we investigate if exposure to different light conditions might have triggered evolutionary divergence in the visual system through pressures on light sensitivity, visual acuity, and neural processing capacity. Our analyses suggest that birds that have adopted nocturnal habits evolved eyes with larger corneal diameters and, to a lesser extent, longer axial length than diurnal species. However, we found no evidence that sensing and processing organs were selected together, as observed in diurnal birds. Rather than enlarging the processing centers, we found a tendency among nocturnal species to either reduce or maintain the size of the two main brain centers involved in vision-the optic tectum and the wulst. These results suggest a mosaic pattern of evolution, wherein optimization of the eye optics for efficient light capture in nocturnal species may have compromised visual acuity and central processing capacity. (© The Author(s) 2024. Published by Oxford University Press on behalf of The Society for the Study of Evolution (SSE). All rights reserved. For commercial re-use, please contact reprints@oup.com for reprints and translation rights for reprints. All other permissions can be obtained through our RightsLink service via the Permissions link on the article page on our site—for further information please contact journals.permissions@oup.com.)
Databáze:	MEDLINE
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