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Hybrid Dysfunction Expressed as Elevated Metabolic Rate in Male Ficedula Flycatchers

Sirkia PM; Alund M; McFarlane SE; Qvarnstrom A

Hybrid Dysfunction Expressed as Elevated Metabolic Rate in Male Ficedula Flycatchers

Sirkia PM
Alund M
McFarlane SE
Qvarnstrom A
Katso/Avaa
Publisher's version (387.7Kb)
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PUBLIC LIBRARY SCIENCE
doi:10.1371/journal.pone.0161547
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2021042715861
Tiivistelmä

Studies of ecological speciation are often biased towards extrinsic
sources of selection against hybrids, resulting from intermediate hybrid
morphology, but the knowledge of how genetic incompatibilities
accumulate over time under natural conditions is limited. Here we focus
on a physiological trait, metabolic rate, which is central to life
history strategies and thermoregulation but is also likely to be
sensitive to mismatched mitonuclear interactions. We measured the
resting metabolic rate of male collared, and pied flycatchers as well as
of naturally occurring F1 hybrid males, in a recent hybrid zone. We
found that hybrid males had a higher rather than intermediate metabolic
rate, which is indicative of hybrid physiological dysfunction. Fitness
costs associated with elevated metabolic rate are typically
environmentally dependent and exaggerated under harsh conditions. By
focusing on male hybrid dysfunction in an eco-physiological trait, our
results contribute to the general understanding of how combined
extrinsic and intrinsic sources of hybrid dysfunction build up under
natural conditions.

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