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Precopulatory guarding-time of the male amphipod Eogammarus oclairi : effect of population structure

Precopulatory guarding-time of the male amphipod Eogammarus oclairi : effect of population structure 227 124 124 2 2 O. Iribarne M. Fernandez D. Armstrong Departmento de Biologia Universidad Nacional de Mar del Plata Funes 3250 7600 Mar del Plata Argentina Departamento de Biologia, C114D (Estacion Las Cruses) Pontificia Universidad Catolica de Chile Santiago de Chile Chile School of Fisheries, WH-10 University of Washington 98195 Seattle Washington USA Abstract This study shows that population structure affects guarding time in the amphipod Eogammarus oclairi Bousfield. In the laboratory, mean guarding time depended on the male weight-frequency distribution, operational sex ratio, and male density. It was longer when the male population encompassed a broad range of weights than when the weight distribution was narrower; however, guarding time did not differ when the population's weight distribution was narrow and composed of either small or large males. Mean guarding time varied between a few hours when the operational sex ratio (male:female) was 1:3 to>7 d when the sex ratio was 2:1. It was also affected by male density, increasing as male density increased. The results suggest that the stimulus to guard depends on the intensity of male-male competition. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Marine Biology Springer Journals

Precopulatory guarding-time of the male amphipod Eogammarus oclairi : effect of population structure

Iribarne, O.; Fernandez, M.; Armstrong, D.
Marine Biology , Volume 124 (2) – Dec 1, 1995
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References (36)

Publisher
Springer Journals
Copyright
Copyright © 1995 by Springer-Verlag
Subject
Life Sciences; Biomedicine general; Oceanography; Ecology; Microbiology; Zoology
ISSN
0025-3162
eISSN
1432-1793
DOI
10.1007/BF00347126
Publisher site
See Article on Publisher Site

Abstract

227 124 124 2 2 O. Iribarne M. Fernandez D. Armstrong Departmento de Biologia Universidad Nacional de Mar del Plata Funes 3250 7600 Mar del Plata Argentina Departamento de Biologia, C114D (Estacion Las Cruses) Pontificia Universidad Catolica de Chile Santiago de Chile Chile School of Fisheries, WH-10 University of Washington 98195 Seattle Washington USA Abstract This study shows that population structure affects guarding time in the amphipod Eogammarus oclairi Bousfield. In the laboratory, mean guarding time depended on the male weight-frequency distribution, operational sex ratio, and male density. It was longer when the male population encompassed a broad range of weights than when the weight distribution was narrower; however, guarding time did not differ when the population's weight distribution was narrow and composed of either small or large males. Mean guarding time varied between a few hours when the operational sex ratio (male:female) was 1:3 to>7 d when the sex ratio was 2:1. It was also affected by male density, increasing as male density increased. The results suggest that the stimulus to guard depends on the intensity of male-male competition.

Journal

Marine Biology – Springer Journals

Published: Dec 1, 1995

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