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Author: Pedro Galán

Animal Biology , Vol. 54, No. 1, pp. 57-75 (2004) Ó Koninklijke Brill NV, Leiden, 2004. Also available online - www.brill.nl Structure of a population of the lizard Podarcis bocagei in northwest Spain: variations in age distribution, size distribution and sex ratio PEDRO GALÁN Departamento de

In: Animal Biology

OPERATIONAL SEX RATIOS IN SEAHORSES by AMANDA C.J. VINCENT1,2) (Large Animal Research Group, Department of Zoology, University of Cambridge, Down- ing St., Cambridge CB2 3EJ, UK) (With I Figure) (Acc. 18-I-1994) Summary Contrary to all expectations based on their male pregnancy, recent work

In: Behaviour
Author: Adansi Amankwaa

© Koninklijke Brill NV, Leiden, 2007 DOI: 10.1163/156921007X236972 Th e Effects of Polygyny and Domicility on Offspring Sex Ratio in Ghana Adansi A. Amankwaa 1 Department of Psychology, Sociology and Social Work, 504 College Drive, Albany State University, Albany GA 31705, USA adansi

In: African and Asian Studies

REPRODUCTIVE COMPETITION AND SELECTION ON MALE TRAITS AT VARYING SEX RATIOS IN THE FIELD CRICKET, GRYLLUS PENNSYLVANICUS by KONSTANTINE SOUROUKIS and WILLIAM H. CADE1) (Department of Biological Sciences, Brock University, St. Catharines, Ontario Canada L2S 3A1) (With 5 Figures) (Acc. 30-VI-1993

In: Behaviour

Sex ratio and body size among hatchlings of habu, Trimeresurus flavoviridis, from the Okinawa Islands, Japan Masahiko Nishimura, Takao Kamura Department of Habu, Okinawa Prefectural Institute of Public Health, Ozato 2003, Okinawa 901-12, Japan Abstract. Embryo and hatchling sex ratios were

In: Amphibia-Reptilia
Author: D.F. Owen

Seasonal change in sex ratio in Acraea quirina (F.) (Lep. Nymphalidae), and notes on the factors causing distortions of the sex ratio in butterflies By D. F. OWEN Department of Animal Ecology, University of Lund Present address: 66 Scraptoft Lane, Leicester, England Abstract The butterfly

In: Insect Systematics & Evolution

Introduction The ratio of males to females in a mature population, i.e. the sex ratio, is an essential demographic parameter. In an ecological context, the sex ratio is among the most important factors in the dynamics, genetics, life history and evolution of populations (Godfray and Werren

In: Amphibia-Reptilia

An unstable social environment affects sex ratio in guinea pigs: an adaptive maternal effect? Kristina Kemme 1) , Sylvia Kaiser 1,3) , Nikolaus von Engelhardt 2) , Dirk Wewers 1) , Ton Groothuis 2) & Norbert Sachser 1) ( 1 Department of Behavioural Biology, University of Münster, Badestrasse 9

In: Behaviour
Author: Clint D. Kelly

1. Introduction The adult sex ratio is an aspect of the social environment that profoundly affects the reproductive behaviour of males and females across a wide variety of animal taxa (Emlen & Oring, 1977 ; Weir et al., 2011 ; de Jong et al., 2012; Szekely et al., 2014 ). One type of

In: Behaviour
Authors: M.J. Parr and Marion Palmer

The Sex Ratios, Mating Frequencies and Mating Expectancies of Three Coenagriids (Odonata : Zygoptera) in Northern England By M. J. PARR and MARION PALMER Department of Biology, University of Salford, Salford M5 4WT, England (Present address: Department of Biological Sciences, Ahmadu Bello

In: Insect Systematics & Evolution