NDLI: The energetic costs of alternative male reproductive strategies in Xiphophorus nigrensis

Content Provider	Springer Nature Link
Author	Cummings, Molly Elizabeth Gelineau Kattner, Rose
Copyright Year	2009
Abstract	The coexistence of alternative male mating strategies depends on the balance between costs and benefits. Here we examine the short-term metabolic costs associated with distinct reproductive strategies in the genetically determined alternative male phenotypes of a northern swordtail, Xiphophorus nigrensis. In this species, large males court females, non-adorned small males chase females, and intermediate males exhibit both courtship and chase behaviors. Using intermittent flow respirometry, we measure oxygen consumption rates and behaviors of each size class in isolation and in the presence of a female. Changes in oxygen consumption between solitary and female presence trials (ΔVO2) correlated significantly with standard length across all size classes (r = 0.42). Only the large male class exhibited a significant increase in oxygen consumption in female-present trials exhibiting a range of increase from 2 to 200% relative to solitary metabolic rates, but costs of specific courtship displays could not be demonstrated. Sword length explained 54–57% of the variation in oxygen consumption in large male solitary trials and 63–65% in the female-present trials independent of any behavioral correlation with sword length. Our results exhibit similarities to condition-dependent alternative mating systems where the female-favored phenotype has higher energetic costs.
Starting Page	935
Ending Page	946
Page Count	12
File Format	PDF
ISSN	03407594
Journal	Journal of Comparative Physiology A
Volume Number	195
Issue Number	10
e-ISSN	14321351
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-08-18
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Respirometry Alternative mating strategies Swordtails Signaling behavior Energetic costs Animal Physiology Zoology Neurosciences
Content Type	Text
Resource Type	Article
Subject	Physiology Behavioral Neuroscience Animal Science and Zoology Ecology, Evolution, Behavior and Systematics

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