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Lecture 16

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Biology 3446B
Robert Solomon

Lecture 16 – Predation and Prey Management Factors influencing vulnerability of prey 1. Habitat quality - Habitat provides poor or lack of escape over near other resources, or poor visibility for predator detection exposes animals to increased predation - Prey = vulnerable during inclement weather or seasons when limited habitat resources force them to use areas where they are more exposed 2. Decrease animal quality at increase prey densities - Decreased prey alertness, and ability to escape or fight may result from intrinsic or extrinsic density dependent factors - Extrinsic factors: Scarcity of food quality when prey population is high - Intrinsic factors: fighting and injuries to prey making them more vulnerable to predation - Prey with dominance hierarchies – subordinate animals affected most severely 3. Dispersal of subordinate prey animals in poor habitats - In territorial prey species, subordinate animals are forces into “poor” habitats where they are more vulnerable to predation - As prey population increase, a greater proportion of population will be in poor habitat 4. The evolved predator-evasion strategy of prey - Prey animals have evolved adaptations that limit the effectiveness of predators in naturally associated environments - Evolved adaptations may be ineffective when environments are altered by human activity 5. Increas
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