Assessing Habitat Selection when Availability Changes

Arthur, Stephen M.; Manly, Bryan F. J.; McDonald, Lyman L.; Garner, Gerald W.

doi:10.2307/2265671

Cited by 302 publications

(349 citation statements)

References 39 publications

(87 reference statements)

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“…We examined availability at the scale of an approximate daily movement capability of caribou using the 95 th percentile movement distance (Arthur et al, 1996) between consecutive 20-h fixes calculated for each herd during each season. We selected the 95 th percentile movement distance after examining frequency distributions by herd and season to identify the distance that a caribou was capable of moving in a 20-h period with the exception of movements that were not typical and may have been provoked by rare human or other disturbance.…”

Section: Defining Availabilitymentioning

confidence: 99%

Comparison of seasonal habitat selection between threatened woodland caribou ecotypes in central British Columbia

Jones

Gillingham

Seip

et al. 2007

Ran

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Woodland caribou (Rangifer tarandus caribou) in British Columbia have been classified into ecotypes based on differences in use of habitat in winter. Although recovery planning focuses on ecotypes, habitat use and selection varies within ecotypes. Our objectives were to compare habitat use and selection among previously identified woodland caribou herds at the transition zone between northern (Moberly, Quintette, and Kennedy herds) and mountain (Parsnip herd) ecotypes in central British Columbia. We developed selection models for each herd in spring, calving, summer/fall, early and late winter. Topographic models best predicted selection by most herds in most seasons, but importance of vegetation-cover was highlighted by disproportionate use of specific vegetation-cover types by all caribou herds (e.g., in early winter, 75% of Kennedy locations were in pine-leading stands, 84% of Parsnip locations were in fir and fir-leading stands, and 87 and 96% of locations were in alpine for the Moberly and Quintette herds, respectively). Using a combination of GPS and VHF radio-collar locations, we documented some spatial overlap among herds within the year, but use of vegetation-cover types and selection of elevations, aspects, and vegetation-cover types differed among herds and within ecotypes in all seasons. Habitat use and selection were most similar between the two northern-ecotype herds residing on the eastern side of the Rocky Mountains. This research indicates that habitat use and selection by caribou herds in all seasons is more variable than ecotype classifications suggest and demonstrates the value of undertaking herd-specific mapping of critical habitat for woodland caribou.

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Section: Defining Availabilitymentioning

confidence: 99%

Comparison of seasonal habitat selection between threatened woodland caribou ecotypes in central British Columbia

Jones

Gillingham

Seip

et al. 2007

Ran

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“…The distance each caribou moved per day was calculated by comparing the location of the individual with its previous location. 1 calculated the 9 0 ' maximum percentile of subsequent daily location distances (Arthur et al 1996). This distance was then used to define the bufFer radius for each animal's locations using ArcView 3.1 (Figure 4-1 ).…”

Section: ) Ail Locations Were Imported Into Arcview Version 31 mentioning

confidence: 99%

Responses of Mountain Caribou to Linear Features in a West-Central Alberta Landscape

Oberg¹,

Rohner²,

Schmiegelow³

2002

Environmental Concerns in Rights-of-Way Management: 7th International Symposium

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The author has granted a nonexclasive licence allowing the National Library of Canada to reproduce, loan, distriiute or sell copies of this thesis in microform, paper or electronic formats. other hear feature data were obtained using road activity sweys, and aerial photographs to determine relative pst-disturbance age of the h e m features.Caribou locations were disûibuted non-randomly arormd streams and roads, with preference increasing as the distance h m these h e m features increased. Caribou avoided streams to a maximum distance of 250 m, and roads to a maximum distance of 500 m. rosuffcient caribou locations occurred arouad active mads for separate analysis, but caribou avoided in-active roads to a distance of 250 m, signaling thai the mechankm for avoidance may be more than a response to increased human activity. There was no significant avoidance or preference by c&bou for seismic lines. However, caribou were 26% more likely to occur around seismic h e s greater than 23 years of age than around more recent hes. The lack of avoidance response by caribou to seismic lines determineci in this study may be attributed to low statistical power, the possible success of current low impact mitigation measures, or to aspects of mountain caribou We history.This study contributes additional evidence that linear features are affecthg woodland caribou distributions and may be leading to fiuictional habitat loss.Management approaches prescribed by current industrial operating guidelines on caribou ranges are discussed and 1 present additional stnitegies for reducing disturbance effects of linear features on montain caribou habitat in west-cenûai Alberta.

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“…• The model of Arthur et al (1996) can be seen as special case of our model. There it is assumed that the availability parameters are constant over time for each animal,…”

Section: B (R)mentioning

confidence: 99%

“…So in their case, availability is only estimated and constant over each year. Arthur et al (1996) demonstrate with an example of five female polar bears in the Bering and Chukchi seas how to deal with changing availability. They defined availability as circles around each location to account for the highly variable nature of sea ice.…”

Section: Introductionmentioning

confidence: 99%

“…To our knowledge only three studies have used simple versions of multinomial logit models in habitat selection studies (Arthur et al (1996), Cooper & Millspaugh (1999), and McCracken, Manly & Vander Heyden (1998)). McCracken et al (1998) give a detailed introduction into multinomial logit models and discuss a simple example of one black bear female.…”

Section: Introductionmentioning

confidence: 99%

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A general approach to the analysis of habitat selection

2009

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Investigating habitat selection of animals aims at the detection of preferred and avoided habitat types as well as at the identification of covariates influencing the choice of certain habitat types. The final goal of such analyses is an improvement of the conservation of animals. Usually, habitat selection by larger animals is assessed by radio-tracking or visual observation studies, where the chosen habitat is determined for a number of animals at a set of time points. Hence the resulting data often have the following structure: A categorical variable indicating the habitat type selected by an animal at a specific time point is repeatedly observed and shall be explained by covariates. These may either describe properties of the habitat types currently available and / or properties of the animal. In this paper, we present a general approach for the analysis of such data in a categorical regression setup. The proposed model generalises and improves upon several of the approaches previously discussed in the literature and in particular allows to account for changing habitat availability due to the movement of animals within the observation area. It incorporates both habitat-and animal-specific covariates, and includes individual-specific random effects in order to account for correlations introduced by the repeated mea-1 surements on single animals. The methodology is implemented in a freely available software package. We demonstrate the general applicability and the capabilities of the proposed approach in two case studies: The analysis of a songbird in SouthAmerica and a study on brown bears in Central Europe.

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Assessing Habitat Selection when Availability Changes

Cited by 302 publications

References 39 publications

Comparison of seasonal habitat selection between threatened woodland caribou ecotypes in central British Columbia

Comparison of seasonal habitat selection between threatened woodland caribou ecotypes in central British Columbia

Responses of Mountain Caribou to Linear Features in a West-Central Alberta Landscape

A general approach to the analysis of habitat selection

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