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Long life evolves in large brained bird lineages (1 Viewer)

Fred Ruhe

Well-known member
Netherlands
Dante Jiménez‐Ortega, Niclas Kolm, Simone Immler, Alexei A. Maklakov & Alejandro Gonzalez‐Voyer, 2020

Long life evolves in large brained bird lineages

Evolution (advance online publication)
doi: https://doi.org/10.1111/evo.14087
https://onlinelibrary.wiley.com/doi/10.1111/evo.14087

Abstract:

The brain is an energetically costly organ that consumes a disproportionate amount of resources. Species with larger brains relative to their body size have slower life histories, with reduced output per reproductive event and delayed development times that can be offset by increasing behavioral flexibility. The “cognitive buffer” hypothesis maintains that large brain size decreases extrinsic mortality due to greater behavioral flexibility, leading to a longer lifespan. Alternatively, slow life histories, and long lifespan can be a pre‐adaptation for the evolution of larger brains. Here we use phylogenetic path analysis to contrast different evolutionary scenarios and disentangle direct and indirect relationships between brain size, body size, life history and longevity across 339 altricial and precocial bird species. Our results support both a direct causal link between brain size and lifespan, and an indirect effect via other life history traits. These results indicate that large brain size engenders longer life, as proposed by the “cognitive buffer” hypothesis.

Enjoy,

Fred
 

Fred Ruhe

Well-known member
Netherlands
Figure 1. Theoretical framework of the study. a) Allometric effects scenario, b) Brain effects scenario, and c) Combined effects scenario. Arrows indicate proposed direct associations between traits. Dotted lines represent links that were not present in all models (See Supplementary material for the complete set of tested models). Continuous lines represent links present in all models, based on previous evidence supporting the relevance of such relationships (see Methods for details). Br= Brain mass; B= Body mass; E= Egg mass; C= Clutch size; I= Incubation period; F= Fledging age; L= Maximum longevity.

Fred
 

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