Optimal use of resources structures home ranges and spatial distribution of black bears

Research has shown that territories of animals are economical. Home ranges should be similarly efficient with respect to spatially distributed resources and this should structure their distribution on a landscape, although neither has been demonstrated empirically. To test these hypotheses, we used home range models that optimize resource use according to resource-maximizing and area-minimizing strategies to evaluate the home ranges of female black bears, Ursus americanus, living in the southern Appalachian Mountains. We tested general predictions of our models using 104 home ranges of adult female bears studied in the Pisgah Bear Sanctuary, North Carolina, U.S.A., from 1981 to 2001. We also used our models to estimate home ranges for each real home range under a variety of strategies and constraints and compared similarity of simulated to real home ranges. We found that home ranges of female bears were efficient with respect to the spatial distribution of resources and were best explained by an area-minimizing strategy with moderate resource thresholds and low levels of resource depression. Although resource depression probably influenced the spatial distribution of home ranges on the landscape, levels of resource depression were too low to quantify accurately. Home ranges of lactating females had higher resource thresholds and were more susceptible to resource depression than those of breeding females. We conclude that home ranges of animals, like territories, are economical with respect to resources, and that resource depression may be the mechanism behind ideal free or ideal preemptive distributions on complex, heterogeneous landscapes.

[1]  Michael S. Mitchell,et al.  Test of a habitat suitability index for black bears in the southern Appalachians , 2002 .

[2]  Steven W. Buskirk,et al.  HOME RANGE, TIME, AND BODY SIZE IN MAMMALS' , 1986 .

[3]  R. Macmillen,et al.  Threshold Model of Feeding Territoriality and Test with a Hawaiian Honeycreeper , 1976, Science.

[4]  R. Ims.  Responses in spatial organization and behaviour to manipulations of the food resource in the vole Clethrionomys rufocanus , 1987 .

[5]  Jean-Michel Gaillard,et al.  Ecological correlates of home‐range size in spring–summer for female roe deer (Capreolus capreolus) in a deciduous woodland , 2005 .

[6]  Andrew E. Derocher,et al.  Space-use strategies of female polar bears in a dynamic sea ice habitat , 2001 .

[7]  James L. D. Smith,et al.  Influence of Food Distribution and Predation Pressure on Spacing Behavior in Palm Civets , 1995 .

[8]  W. V. Winkle.  COMPARISON OF SEVERAL PROBABILISTIC HOME-RANGE MODELS' , 1975 .

[9]  M. Bhaskara Rao,et al.  Model Selection and Inference , 2000, Technometrics.

[10]  R. Powell,et al.  KERNELHR: A program for estimating animal home ranges , 1998 .

[11]  L. Crowder,et al.  LIFE HISTORIES AND ELASTICITY PATTERNS: PERTURBATION ANALYSIS FOR SPECIES WITH MINIMAL DEMOGRAPHIC DATA , 2000 .

[12]  M. Hixon.  Food Production and Competitor Density as the Determinants of Feeding Territory Size , 1980, The American Naturalist.

[13]  S. Amstrup,et al.  Activity Patterns of Radio-Collared Black Bears in Idaho , 1976 .

[14]  R. Powell,et al.  An Evaluation of the Accuracy of Kernel Density Estimators for Home Range Analysis , 1996 .

[15]  J. Grant,et al.  OPTIMAL TERRITORY SIZE IN THE CONVICT CICHLID , 1999 .

[16]  T. Saitoh.  The effects and limits of territoriality on population regulation in grey red-backed voles,Clethrionomys rufocanus bedfordiae , 1991, Researches on Population Ecology.

[17]  S. Fretwell.  Populations in a seasonal environment. , 1973, Monographs in population biology.

[18]  J. Ebersole.  Food Density and Territory Size: An Alternative Model and a Test on the Reef Fish Eupomacentrus leucostictus , 1980, The American Naturalist.

[19]  Donald R. Powers,et al.  The Effect of Food Availability on Time and Energy Expenditures of Territorial and Non-Territorial Hummingbirds , 1994 .

[20]  H. Simon,et al.  Models of Discovery : and other topics in the methods of science , 1977 .

[21]  J. A. Litvaitis,et al.  Bobcat Habitat Use and Home Range Size in Relation to Prey Density , 1986 .

[22]  M. Conroy,et al.  Home range, movements, and habitat use of coyotes in southcentral Georgia , 1992 .

[23]  S. Gehrt,et al.  Resource distribution, female home range dispersion and male spatial interactions: group structure in a solitary carnivore , 1998, Animal Behaviour.

[24]  Geoffrey M. Jacquez,et al.  Quantification of the Spatial Co-Occurrences of Ecological Boundaries , 1996 .

[25]  J. S. Lindzey,et al.  Dynamics of Home Range and Movements of Adult Black Bears in Northeastern Pennsylvania , 1980 .

[26]  M. Hixon,et al.  Territory Area, Flower Density, and Time Budgeting in Hummingbirds: An Experimental and Theoretical Analysis , 1983, The American Naturalist.

[27]  C. Willey.  Aging Black Bears from First Premolar Tooth Sections , 1974 .

[28]  C. Both,et al.  Density Dependence, Territoriality, and Divisibility of Resources: From Optimality Models to Population Processes , 2003, The American Naturalist.

[29]  John W. Zimmerman,et al.  Radiotelemetry error : location error method compared with error polygons and confidence ellipses , 1995 .

[30]  M. Hixon.  Energy Maximizers and Time Minimizers: Theory and Reality , 1982, The American Naturalist.

[31]  C. S. Holling.  The components of prédation as revealed by a study of small-mammal prédation of the European pine sawfly. , 1959 .

[32]  L. Rogers.  Social relationships, movements, and population dynamics of black bears in northeastern Minnesota , 1977 .

[33]  Michael S. Mitchell,et al.  A mechanistic home range model for optimal use of spatially distributed resources , 2004 .

[34]  F. Gill,et al.  Economics of Feeding Territoriality in the Golden-Winged Sunbird , 1975 .

[35]  F. Palomares.  Site fidelity and effects of body mass on home-range size of Egyptian mongooses , 1994 .

[36]  E. Jones.  Effects of Forage Availability on Home Range and Population Density of Microtus pennsylvanicus , 1990 .

[37]  Michael Edward Hohn,et al.  An Introduction to Applied Geostatistics: by Edward H. Isaaks and R. Mohan Srivastava, 1989, Oxford University Press, New York, 561 p., ISBN 0-19-505012-6, ISBN 0-19-505013-4 (paperback), $55.00 cloth, $35.00 paper (US) , 1991 .

[38]  H. Pulliam,et al.  Sources, Sinks, and Habitat Selection: A Landscape Perspective on Population Dynamics , 1991, The American Naturalist.

[39]  L. Rogers.  Effects of Food Supply and Kinship on Social Behavior Movements and Population Growth of Black Bears in Northeastern Minnesota USA , 1987 .

[40]  W. H. Burt.  Territoriality and Home Range Concepts as Applied to Mammals , 1943 .

[41]  Thomas W. Schoener,et al.  An empirically based estimate of home range , 1981 .

[42]  P. Frank,et al.  Boston Studies in the Philosophy of Science , 1968 .

[43]  B. Worton.  Kernel methods for estimating the utilization distribution in home-range studies , 1989 .

[44]  F. Lindzey,et al.  Home Range and Habitat Use by Black Bears in Southwestern Washington , 1977 .

[45]  R. Powell,et al.  Internal structure of home ranges of black bears and analyses of home-range overlap , 1990 .

[46]  R. Powell.  Black Bear Home Range Overlap in North Carolina and the Concept of Home Range Applied to Black Bears , 1987 .

[47]  T. Schoener.  Simple Models of Optimal Feeding-Territory Size: A Reconciliation , 1983, The American Naturalist.

[48]  R. Ruff,et al.  Population Dynamics and Movements of Black Bears Ursus-Americanus in East Central Alberta Canada , 1982 .

[49]  John W. Zimmerman,et al.  Ecology and Behaviour of North American Black Bears: Home Ranges, Habitat and Social Organization , 1996 .

[50]  G. S. Boomer,et al.  Modeling annual energy metabolism rhythms in mammals , 2005 .

[51]  Richard S. Ostfeld,et al.  Territoriality and mating system of California voles , 1986 .

[52]  Norman A. Slade,et al.  Influence of sampling interval on estimates of home-range size , 1985 .

[53]  R. Powell,et al.  Topographical constraints and home range quality , 1998 .

[54]  F. Bunnell,et al.  Home Range and Body Weight-- A Reevaluation , 2007 .

[55]  J. Krebs,et al.  Behavioural Ecology: An Evolutionary Approach , 1978 .

[56]  James H. Brown,et al.  Influence of Economics, Interspecific Competition, and Sexual Dimorphism on Territoriality of Migrant Rufous Hummingbirds , 1978 .