Seasonal changes in body size,sexual size dimorphism and sex ratio in relation to mating system in an adult odonate community |
| |
Authors: | Jesús?Wong-Mu?oz Email author" target="_blank">Alex?Córdoba-AguilarEmail author Raúl?Cueva del Castillo Martín?A?Serrano-Meneses John?Payne |
| |
Institution: | 1.Departamento de Ecología Evolutiva, Instituto de Ecología,Universidad Nacional Autónoma de México,México DF,Mexico;2.UBIPRO, Laboratorio de Ecología,Universidad Nacional Autónoma de México,Edo. de México,Mexico;3.Centro de Investigación en Reproducción Animal,CINVESTAV-Universidad Autónoma de Tlaxcala,Tlaxcala,Mexico;4.Vashon,USA |
| |
Abstract: | Seasonal environments impose developmental time constraints on insects which can be reflected in body size and sex ratio.
By tracking these two aspects in recently emerged adults of 10 species of an odonate community in a number of lakes, we investigated
whether (a) body size in both sexes decreased as the flight season progressed and whether this led to seasonal changes in
sexual size dimorphism (SSD); (b) SSD patterns were related to mating systems; (c) biases in sex ratio could be explained
by mortality rates associated with the largest sex (e.g. in species with male-biased SSD, a female-biased sex ratio; in species
with female-biased SSD, a male-biased sex ratio). Our results indicated that adults in most species, but not all, tend to
reach a smaller body size as the season progressed. However, the opposite pattern was found in a few species. Predictions
about the relation between SSD and mating systems were confirmed: a female-biased SSD in nonterritorial species and monomorphism
for territorial species. However, predictions of biases in sex ratio according to SSD were not met in all species. Interestingly,
changes in body size and SSD along the season were lake-specific in two species in which these patterns could be examined.
These results, although partially supportive of environmental and sexual selection patterns acting on size and sex ratio as
documented in other odonate species, indicate that we are still far from understanding seasonal constrains in these animals. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|