Resource Selection by Animals: Statistical Design and Analysis for Field Studies

Copertina anteriore
Springer Science & Business Media, 1993 - 177 pagine
We have written this book as a guide to the design and analysis of field studies of resource selection, concentrating primarily on statistical aspects 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 such, we have made no attempt to address those aspects of theoretical ecology that are concerned with how animals might choose their resources if they acted in an optimal manner. The book is based on the concept of a resource selection function, where this is a function of characteristics measured on resource units such that its value for a unit is proportional to the probability of that unit being used. We argue that this concept leads to a unified theory for the analysis and interpretation of data on resource selection and can replace many ad hoc statistical methods that have been used in the past.
 

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Indice

Introduction to resource selection studies
1
12 THE DATA FOR RESOURCE SELECTION STUDIES
4
14 SAMPLING PROTOCOLS
8
15 INDICES OF SELECTION
9
16 HYPOTHESIS TESTS AND CONFIDENCE INTERVALS
11
17 DISCUSSION
13
Examples of the use of resource selection functions
14
22 EXAMPLES
15
52 ESTIMATING THE LOGISTIC FUNCTION
71
53 DISCUSSION
82
Estimating a resource selection probability function from a census of resource units at several points in time using the proportional hazards model
89
62 ESTIMATING THE PROPORTIONAL HAZARDS FUNCTION
91
63 DISCUSSION
95
Estimating resource selection functions from samples of resource units using proportional hazards and loglinear models
99
72 EXPECTED SAMPLE FREQUENCIES FOR RESOURCE UNITS
100
73 THE PROPORTIONAL HAZARDS MODEL
101

23 SAMPLE DESIGNS
29
Statistical modelling procedures
32
33 LOGLIKELIHOOD CHISQUARED TESTS
33
34 ANALYSIS OF RESIDUALS
34
35 MULTIPLE TESTS AND CONFIDENCE INTERVALS
35
Studies with resources defined by several categories
36
43 RATIOS OF RANDOM VARIABLES
37
44 CHISQUARED TESTS
39
45 DESIGN I WITH KNOWN PROPORTIONS OF AVAILABLE RESOURCE UNITS
40
46 TESTS ON PROPORTIONS OF USED UNITS
42
47 INFERENCES CONCERNING SELECTION RATIOS
46
48 COMPARISON OF SELECTION RATIOS
47
49 DESIGN I WITH ESTIMATED PROPORTIONS OF AVAILABLE RESOURCE UNITS
49
410 DESIGN II WITH SAMPLING PROTOCOL A
54
412 Sample of available resource units
61
413 DESIGN III WITH SAMPLING PROTOCOL A
65
415 SAMPLE OF AVAILABLE RESOURCE UNITS
66
416 DISCUSSION
67
Estimating a resource selection probability function from a census of resource units using logistic regression
70
74 SMALL PROPORTION OF RESOURCE UNITS USED
102
75 ONLY SAMPLES OF UNUSED RESOURCE UNITS AVAILABLE
103
77 INFERENCES WITH SAMPLE DATA
106
78 RECOMMENDATIONS
122
Estimating a resource selection function from two samples of resource units using logistic regression and discriminant function methods
125
82 LINEAR DISCRIMINANT FUNCTION ANALYSIS
130
83 QUADRATIC DISCRIMINANT FUNCTION ANALYSIS
135
General loglinear modelling
137
92 FITTING MODELS TO DATA
138
Analysis of the amount of use
145
102 ANALYSIS OF COUNTS OF THE AMOUNT OF USE
146
103 ANALYSIS OF CONTINUOUS MEASURES OF THE AMOUNT OF USE
154
104 MIXTURES OF ZEROS AND POSITIVE MEASURES OF THE AMOUNT OF USE
155
The comparison of selection for different types of resource unit
158
References
165
Author Index
173
Subject Index
176
Copyright

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