Titlebook: Resource Selection by Animals; Statistical design a Bryan F. J. Manly,Lyman L. McDonald,Dana L. Thomas Book 1993 Bryan F.J. Manly, Lyman L.

大范围流行

Estimating resource selection functions from samples of resource units using proportional hazards a small fraction of the available resource units are used and samples of available and used resource units are available. The third model is appropriate when an appreciable proportion of resource units are used and only samples of unused units are taken.

宣誓书

Examples of the use of resource selection functions,, and (c) the difference between studies that involve one period of selection time and studies that involve several periods of selection time. In addition, the assumptions that are required for the estimation of resource selection functions are discussed.

cutlery

Book 1993 of the comparison of the use and availability of resources of different types. Our in­ tended audience is field ecologists in general and wildlife biologists in particular who are attempting to measure the extent to which real animal populations are selective in their choice of food and habitat. As

Embolic-Stroke

Atmosphere

Statistical modelling procedures,the simplest model that accounts adequately for the observed variation. The chosen model is then used to assess the amount of resource selection. Within this model-based framework there is a variety of inference procedures that are useful. These procedures are reviewed in this chapter.

Eviction

Studies with resources defined by several categories, several categories. These studies are the simplest that can be carried out, and are also the ones that are used most often. They are therefore worth considering in their own right, although they can be thought of as special cases of the more general types of study design that are discussed in later

Grasping

Estimating a resource selection probability function from a census of resource units using logistic of resource units, and estimating a logistic function for the probability of use as a function of variables that are measured on the units. This approach is discussed in this chapter, and is illustrated using data on the selection of winter habitat by antelope.

青石板

Estimating resource selection functions from samples of resource units using proportional hazards aits or unused resource units. The differences between these models are related to the sampling protocols A, B and C that have been defined in section 1.4, but an extra important factor is the proportion of available units that are used. The first model is appropriate when either sampling fractions a

缓和

GOAT

Analysis of the amount of use, not. Three principal cases are recognized: (a) where the amount of use is a count (such as the number of animals present); (b) where the amount of use is measured (such as the biomass eaten); and (c) where the distribution of the amount of use is a mixture of zeros for unused units and a distributi