Theory and methods of exploring sex ratios in plants, animals and microbes.Sex Ratios: Concepts and Research Methods provides both context to and instruction on many aspects of research on sex ratios. Unlike other books on the topic, it covers both how to carry out research on sex ratios and why such research is important in the context of evolutionary ecology. A wide spectrum of animal plant and microbial groups are covered, from malarial parasites to humans. Researchers and graduate students in behavioural and evolutionary ecology will find it an indispensable reference work for their research.Sex Ratios: Concepts and Research Methods provides both context to and instruction on many aspects of research on sex ratios. Unlike other books on the topic, it covers both how to carry out research on sex ratios and why such research is important in the context of evolutionary ecology. A wide spectrum of animal plant and microbial groups are covered, from malarial parasites to humans. Researchers and graduate students in behavioural and evolutionary ecology will find it an indispensable reference work for their research.This multi-author volume provides both a conceptual context and an instruction in methods for many aspects of sex ratio research. The book discusses theory, statistical analysis, and genetics, as well as research in one of a wide spectrum of animal, plant, and microbial taxa. Sex Ratios: Concepts and Research Methods is primarily intended for graduate and professional behavioral and evolutionary ecologists in this field, but it will also be useful to biologists building evolutionary models, and researchers analyzing data involving proportions or comparisons across phylogenetically related species.Preface and acknowledgements; Part I. Sex Ratio Theory: 1. Models of sex ratio evolution Jon Seger and J. William Stubblefield; 2. Optimal sex allocation: steps towards a mechanistic theory Ido R. Pen and Franz J. Weissing; Part II. Statistical Analysis of Sex RatilĂ$