Juvenile hormone favors sexually-selected traits but impairs fat reserves and abdomen mass in males and females |
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Authors: | Jorge Contreras-Garduño Alex Córdoba-Aguilar Mónica Azpilicueta-Amorín Adolfo Cordero-Rivera |
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Institution: | 1.Departamento de Biología, División de Ciencias Naturales y Exactas,Universidad de Guanajuato,Guanajuato,Mexico;2.Departamento de Ecología Evolutiva, Instituto de Ecología,Universidad Nacional Autónoma de México,Mexico, D. F.,Mexico;3.Grupo de Ecoloxía e da Conservación, Departamento de Ecoloxía e Bioloxía Animal,Universidade de Vigo,Pontevedra, Galicia,Spain |
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Abstract: | The physiological mechanism underlying resource allocation in sexual selection studies has been little studied. One candidate
is hormones as these favor resource allocation to reproductive traits but impair survival due to a resource over-expenditure
directed to the former traits. We have investigated whether a juvenile hormone analog (JHa, methoprene) administrated topically
is involved in the resource allocation to wing pigmentation (an ornamental trait), fat reserves and flight muscle mass in
both sexes of Calopteryx haemorrhoidalis and C. virgo. We also investigated the possible negative effect of such implementation on abdomen mass (an indirect measure of egg production)
and field-based survival in adult males of C. haemorrhoidalis and C. splendens. We found that males and females treated with JHa, against a control group, developed higher wing pigmentation and showed
reduced fat reserves but had no change in muscle mass. In females, JHa decreased abdominal weight (an indicator of fecundity)
and in males, survival was impaired only in C. splendens. These results support the idea that JH induces resource allocation to wing pigmentation, a sexually selected trait in both
sexes. Thus, this study suggests that the action of JH could be a mechanistic link between ornaments and physiological condition
in both males and females. |
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