PotvinLowellFortinEtAl2001

Référence

Potvin, F., Lowell, K., Fortin, M.-J., Belanger, L. (2001) How to test habitat selection at the home range scale: A resampling random windows technique. Ecoscience, 8(3):399-406.

Résumé

Habitat selection studies at the home range scale involve testing whether an animal selects a particular spatial arrangement of habitats within a landscape. We propose a technique based on comparing the landscape pattern indices (LPIs) of observed home ranges with those of a large sample of random windows. In order to determine the appropriate, size of the windows, we examined how this variable influences LPIs in a 138-km(2) boreal forest block where clearcuts were prevalent. Square random windows of three different sizes (289, 729, and 1156 ha) yielded similar habitat composition proportions but very different values for many of the other LPIs. When compared with values computed for the entire landscape as a single window, most LPIs except composition were very different in the random windows. An example of a comparison between marten (Martes americana Turton), home ranges (n = 11) and square random windows (n = 100) in our study area is given, showing a strong selection for mosaics containing more forest (> 30 years), fewer open regenerating stands, and a larger amount of core area in forest. We conclude that computing LPI values for the entire landscape as a single window is inappropriate for testing habitat selection at the home range scale, and that windows of similar size as the home ranges should be used instead.

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@ARTICLE { PotvinLowellFortinEtAl2001,
    AUTHOR = { Potvin, F. and Lowell, K. and Fortin, M.-J. and Belanger, L. },
    TITLE = { How to test habitat selection at the home range scale: A resampling random windows technique },
    JOURNAL = { Ecoscience },
    YEAR = { 2001 },
    VOLUME = { 8 },
    PAGES = { 399-406 },
    NUMBER = { 3 },
    ABSTRACT = { Habitat selection studies at the home range scale involve testing whether an animal selects a particular spatial arrangement of habitats within a landscape. We propose a technique based on comparing the landscape pattern indices (LPIs) of observed home ranges with those of a large sample of random windows. In order to determine the appropriate, size of the windows, we examined how this variable influences LPIs in a 138-km(2) boreal forest block where clearcuts were prevalent. Square random windows of three different sizes (289, 729, and 1156 ha) yielded similar habitat composition proportions but very different values for many of the other LPIs. When compared with values computed for the entire landscape as a single window, most LPIs except composition were very different in the random windows. An example of a comparison between marten (Martes americana Turton), home ranges (n = 11) and square random windows (n = 100) in our study area is given, showing a strong selection for mosaics containing more forest (> 30 years), fewer open regenerating stands, and a larger amount of core area in forest. We conclude that computing LPI values for the entire landscape as a single window is inappropriate for testing habitat selection at the home range scale, and that windows of similar size as the home ranges should be used instead. },
    KEYWORDS = { GIS; habitat selection; home range; landscape; marten; metrics; pattern indices RADIO-TRACKING DATA; LANDSCAPE; PATTERN; FRAGMENTATION; AVAILABILITY; MAMMALS; METRICS; MARTEN; OREGON; LEVEL },
    OWNER = { brugerolles },
    TIMESTAMP = { 2007.12.05 },
}

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