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Female house wrens ( Troglodytes aedon ) increase the size, but not immunocompetence, of their offspring through extra‐pair mating
Author(s) -
FORSMAN ANNA M. ,
VOGEL LAURA A. ,
SAKALUK SCOTT K. ,
JOHNSON BONNIE G. ,
MASTERS BRIAN S. ,
JOHNSON L. SCOTT,
THOMPSON CHARLES F.
Publication year - 2008
Publication title -
molecular ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.619
H-Index - 225
eISSN - 1365-294X
pISSN - 0962-1083
DOI - 10.1111/j.1365-294x.2008.03860.x
Subject(s) - biology , troglodytes , immunocompetence , offspring , mating , brood , mating preferences , mate choice , zoology , sexual selection , ecology , immune system , immunology , genetics , pregnancy
House wrens are typically socially monogamous, but frequently engage in extra‐pair matings leading to multisired broods. Because females do not appear to acquire direct material benefits from their extra‐pair mates, we tested the hypothesis that female house wrens derive indirect genetic benefits, such as enhanced immunocompetence (cutaneous immune activity, humoral immunity, and plasma bactericidal activity) and condition (size and haematoserological traits) for their offspring, by mating polyandrously. We predicted that extra‐pair young (EPY) should show greater immune responsiveness and better body condition than their within‐pair maternal half‐siblings (WPY). Contrary to our prediction, WPY had higher cutaneous immune activity than their EPY brood‐mates in two of three years, and EPY and WPY did not differ in measures of innate and humoral immunity. WPY also had higher albumin to γ‐globulin ratios than EPY; however, they were not in better condition based on other measures. EPY had consistently longer tarsi (a measure of long‐bone size) than their WPY half‐siblings, suggesting that females engage in extra‐pair copulations with larger males. The benefits of large structural size in the study population is unknown, but based on evidence from other passerines, we suggest that structural size may be an important fitness‐related trait in house wrens. We conclude that our results are not consistent with the hypothesis that females gain immune‐related benefits for their offspring by engaging in extra‐pair matings. Further study of the fitness consequences of differences in tarsus length is needed to determine whether females acquire size‐related benefits for their offspring from extra‐pair mates.