Search Results

Robert D. Holt and Michael Barfield

: 247-267. De Meeus, T., Michalakis, Y., Renaud, F., Olivieri, I. 1993. Polymorphism in heterogeneous environments, evolution of habitat selection and sympatric speciation—soft and hard selection models. Evol. Ecol. 7: 175-198. Diehl, S.R., Bush, G.L. 1989. The role of habitat preference in

Niclas Jonzén

habitat preferences and quality depend on spatial scale and metrics of fitness. J. Appl. Ecol. 44: 983-992. Ciarniello, L.M., Boyce, M.S., Seip, D.R. 2007. Grizzly bear habitat selection is scale dependent. Ecol. Appl. 17: 1424-1440. Cressman, R., Křivan, V. 2006. Migration dynamics for the

Daniel Fortin, Douglas W. Morris and Philip D. McLoughlin

and heterogeneity in habitat selection by elk in Yellowstone National Park. �coscience 10: 421-431. Brown, J.S., Pavolvic, N.B. 1992. Evolution in heterogeneous environments: effects of migration on habitat specialization. Evol. Ecol. 6: 360-382. Coltman, D.W., O'Donaoghue, P., Jorgensons

Douglas W. Morris

Most organisms live in heterogeneous environments. Yet we know little about how variations in scales of heterogeneity influence decisions on patch use and habitat selection, and how they impact spatial distribution and evolution. In particular, we need to know whether the choice of habitats and patches emerges from a hierarchy of decisions, whether resource consumption correlates closely with space use, and whether different types of individuals are associated with patterns of spatial distribution. I address these knowledge gaps with field experiments that manipulated the risk and quality of foraging patches exploited by male meadow voles. I used clear versus wooden covers to create risky versus safe foraging sites and added supplemental food to create rich versus poor habitats. I assessed whether the resources harvested from each tray matched its frequency of use by groups of voles expressing different temperament scores. Habitat and patch use did not fit a simple hierarchy of decisions because animals merged space use and foraging speed in a sophisticated strategy of risk management. Giving-up densities mirrored activity densities at the scale of safe versus risky patches but not at the scale of safe versus risky or rich versus poor habitats. Voles tended to prefer one habitat over another for reasons independent of the experimental manipulations. Groups of voles with different temperament scores were not linked to foraging types but were linked to habitat preference. The bias in habitat use by different behavioural types provides a potential mechanism for the evolutionary divergence of populations occupying different habitats.

IDO TSURIM, ZVIKA ABRAMSKY and BURT P. KOTLERB

.G., Smith, F.E., Slobodkin, L.B. 1960. Community structure, population control, and competition. Am. Nat. 94: 421-425. Hutto, R.L. 1981. Seasonal variation in the foraging behavior of some migratory western Wood Warblers. Auk 98: 765-777. Hutto, R.L. 1985a. Habitat selection by nonbreeding

JAY A. ROSENHEIM

Bouskila, A., Robinson, M.E., Roitberg, B.D., Tenhumberg, B. 1998. Life-history decisions under predation risk: importance of a game perspective. Evol. Ecol. 12: 701-715. Heithaus, M.R. 2001. Habitat selection by predators and prey in communities with asymmetrical intraguild

DOUGLAS W. MORRIS

.L., Pinshow, B. 1991. The shape of a gerbil isocline measured using principles of optimal habitat selection. Ecology 72: 329-40. Abramsky, Z., Rosenzweig, M.L., Subach, A. 1992. The shape of a gerbil isocline: an experimental field study. Oikos 63: 193-9. Abramsky, Z., Ovadia, O., Rosenzweig, M

Sven Almquist

Habitat Selection by Spiders on Coastal Sand Dunes in Scania, Sweden By SVEN ALMQUIST Department of Animal Ecology, University of Lund, 223 62 Lund, Sweden Abstract This paper deals with the habitat selection of I5 species of spiders on coastal sand dunes studied by the analysis of their

Peter F. Sale

A SUGGESTED MECHANISM FOR HABITAT SELECTION BY THE JUVENILE MANINI ACANTHURUS TRIOSTEGUS SANDVICENSIS STREETS by PETER F. SALE 1) 2) 3) (Department of Zoology, University of Sydney, Sydney, N.S.W., Australia) (With 6 Figures) (Rec. 20-1-1969) INTRODUCTION The manini, Acanthurus triostegus

Luis M. Carrascal, Carlos Cano and José A. Diaz

Habitat selection in Iberian Psammodromus species along a Mediterranean successional gradient Luis M. Carrascal1, José A. Diaz, Carlos Cano Cátedra de Zoologia (Vertebrados), Departamento de Biologia Animal I, Facultad de Biologia, Universidad Complutense, 28040 Madrid, Spain 1 Present Adress