Demographic origins of skewed operational and adult sex ratios: perturbation analyses of two-sex models
| Autor: | Steven R. Beissinger, Sophie Veran |
|---|---|
| Rok vydání: | 2009 |
| Předmět: |
Male
Sex Characteristics Ecology Forpus passerinus Population Dynamics Biology Models Theoretical biology.organism_classification Venezuela Life stage Psittaciformes Sexual Behavior Animal Juvenile Biological dispersal Animals Philopatry Animal Migration Female Sex Ratio Matrix population models Ecology Evolution Behavior and Systematics Sex ratio Sex characteristics |
| Zdroj: | Ecology letters. 12(2) |
| ISSN: | 1461-0248 |
| Popis: | Skewed sex ratios - operational (OSR) and Adult (ASR) - arise from sexual differences in reproductive behaviours and adult survival rates due to the cost of reproduction. However, skewed sex-ratio at birth, sex-biased dispersal and immigration, and sexual differences in juvenile mortality may also contribute. We present a framework to decompose the roles of demographic traits on sex ratios using perturbation analyses of two-sex matrix population models. Metrics of sensitivity are derived from analyses of sensitivity, elasticity, life-table response experiments and life stage simulation analyses, and applied to the stable stage distribution instead of lambda. We use these approaches to examine causes of male-biased sex ratios in two populations of green-rumped parrotlets (Forpus passerinus) in Venezuela. Female local juvenile survival contributed the most to the unbalanced OSR and ASR due to a female-biased dispersal rate, suggesting sexual differences in philopatry can influence sex ratios more strongly than the cost of reproduction. |
| Databáze: | OpenAIRE |
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