作者
Evan L Preisser, Daniel I Bolnick, Michael F Benard
发表日期
2005/2
期刊
Ecology
卷号
86
期号
2
页码范围
501-509
出版商
Ecological Society of America
简介
Predation is a central feature of ecological communities. Most theoretical and empirical studies of predation focus on the consequences of predators consuming their prey. Predators reduce prey population densities through direct consumption (a density‐mediated interaction, DMI), a process that may indirectly affect the prey's resources, competitors, and other predators. However, predators can also affect prey population density by stimulating costly defensive strategies. The costs of these defensive strategies can include reduced energy income, energetic investment in defensive structures, lower mating success, increased vulnerability to other predators, or emigration. Theoretical and empirical studies confirm the existence of these induced costs (trait‐mediated interactions, TMIs); however, the relative importance of intimidation (TMI) and consumption (DMI) effects remains an open question. We conducted a meta …
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