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Frequently confused terms

Habitat Use Habitat Selection, . Habitat use = occupation of a habitat without any connotation of preference implies used ?for something'Habitat selection = implies choice among those habitats available individs may search for certain habitats for specific behaviors (breed, feed, rest...) use < or

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Frequently confused terms

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    1. Frequently confused terms Habitat use Habitat selection Habitat preference Habitat requirement

    2. Habitat Use Habitat Selection, Habitat use = occupation of a habitat without any connotation of preference implies used ‘for something’ Habitat selection = implies choice among those habitats available individs may search for certain habitats for specific behaviors (breed, feed, rest...) use < or > availability

    3. Habitat Preference Habitat Requirement Habitat preference = implies choice of one habitat over another without regard to whether it is available or not. Preference exists even if habitat is not there. Habitat requirement = implies that the habitat attribute is needed for survival. Differs from preference in that you may prefer 1 among several types that all meet your requirements

    4. How do animals select habitat ? Is habitat selection and innate ability or a learned trait ? Experiments with field mice Harris (1952) Wecker (1963) Laughing gulls in N. Carolina Klopfer & Hailman (1965)

    5. How do animals select habitat ? Concept of stimulus summation Hilden (1965) habitat selection in birds Crayfish example (Tash et al 1990) experiments to determine what constitutes habitat Consequences of not being able to recognize suitable habitat.

    6. How do animals select habitat ? Niche gestalt James (1971) early attempts to evaluate Hutchinson’s (1957) n-dimensional hypervolume Competition and Predation effects on habitat selection Nelson and Mech (1967) wt deer and wolves

    7. Levels of Habitat Selection At the broadest level habitat selection is innate Evolution led to choices that constrain animals to certain geographical boundaries within this ‘range of tolerance’ limited by historical events, animals make choices

    8. Hierarchical levels of habitat selection Johnson (1980) 1st Order - physical or geographical range 2nd Order - home range of an animal or group 3rd Order - habitat components within a HR 4th Order - actual food items etc.

    9. Diagram of hierarchical levels A = Continental 1st order B = Habitat 2nd order C = Components 3rd order

    10. Habitat selection leads to differential population densities Not all parts of distribution have equally good ‘habitat quality’ What factors lead to population densities in a species habitats?

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