Abstract
Animal dispersal and subsequent settlement is a key process in the life history of many organisms, when individuals use demographic and environmental cues to target post-dispersal habitats where fitness will be highest. To investigate the hypothesis that environmental disturbance (habitat fragmentation) may alter these cues, we compared dispersal patterns of 60 red squirrels (Sciurus vulgaris) in three study sites that differ in habitat composition and fragmentation. We determined dispersal distances, pre- and post-dispersal habitat types and survival using a combination of capture–mark–recapture, radio-tracking and genetic parentage assignment. Most (75%) squirrels emigrated from the natal home range with mean dispersal distance of 1,014 ± 925 m (range 51–4,118 m). There were no sex-related differences in dispersal patterns and no differences in average dispersal distance, and the proportion of dispersers did not differ between sites. In one of the sites, dispersers settled in patches where density was lower than in the natal patch. In the least fragmented site, 90% of animals settled in the natal habitat type (habitat cuing) against 44–54% in the more strongly fragmented sites. Overall, more squirrels settled in the natal habitat type than expected based on habitat availability, but this was mainly due to individuals remaining within the natal wood. In the highly fragmented landscape, habitat cuing among emigrants did not occur more frequently than expected. We concluded that increased habitat fragmentation seemed to reduce reliable cues for habitat choice, but that dispersing squirrels settled in patches with lower densities of same-sex animals than at the natal home range or patch, independent of degree of fragmentation.
Similar content being viewed by others
References
Anderson PK (1989) Rodent dispersal. Spec Publ Am Soc Mammal 9:1–142
Andrén H (1994) Effects of habitat fragmentation on birds and mammals in landscapes with different proportions of suitable habitat: a review. Oikos 71:355–363
Bakker VJ, Van Vuren DH (2004) Gap-crossing decisions by the red squirrel, a forest-dependent small mammal. Conserv Biol 18:689–697
Byrom AE (2002) Dispersal and survival of juvenile feral ferrets Mustela furo in New Zealand. J Appl Ecol 39:67–78
Byrom AE, Krebs CJ (1999) Natal dispersal of juvenile arctic ground squirrels in the boreal forest. Can J Zool 78:1309–1319
Clobert J, Danchin E, Dhondt AA, Nichols JD (2001) Dispersal. Oxford University Press, Oxford
Clobert J, Gaillard JF, Cote J, Meylan S, Massot M (2009) Informed dispersal, heterogeneity in animal dispersal syndromes and the dynamics of spatially structured populations. Ecol Lett 12:197–209
Coulon A, Fitzpatrick JW, Bowman R, Stith BM, Makarewich CA, Stenzler LM, Lovette IJ (2008) Congruent population structure inferred from dispersal behaviour and intensive genetic surveys of the threatened Florida scrub-jay (Aphelocoma cœrulescens). Mol Ecol 17:1685–1701
Davis JM, Stamps JA (2004) The effect of natal experience on habitat preferences. Trends Ecol Evol 19:411–416
Dobson FS, Jones WT (1985) Multiple causes of dispersal. Am Nat 126:855–858
Gaillard JM, Hewison AJM, Kjellander P, Pettorelli N, Bonenfant C, Van Moorter B, Liberg O, Andren H, Van Laere E, Klein F, Angibault JM, Coulon A, Vanpé C (2008) Population density and sex do not influence fine-scale natal dispersal in roe deer. Proc R Soc Lond B 275:2025–2030
Garrett MG, Franklin WL (1988) Behavioral ecology of dispersal in the black-tailed prairie dogs. J Mammal 69:236–250
Garshelis DL (2000) Delusions in habitat evaluation: measuring use, selection, and importance. In: Boitani L, Fuller TK (eds) Research techniques in animal ecology: controversies and consequences. Columbia University Press, New York, pp 111–164
Greenwood PJ (1980) Mating system, philopatry and dispersal in birds and mammals. Anim Behav 28:1140–1162
Hale ML, Bevan R, Wolff K (2001) New polymorphic microsatellite markers for the red squirrel (Sciurus vulgaris) and their applicability to the grey squirrel (S. carolinensis). Mol Ecol Notes 1:47–49
Hanski IK, Selonen V (2009) Female-biased natal dispersal in the Siberian flying squirrel. Behav Ecol 20:60–67. doi:10.1093/beheco/arn115
Haughland DL, Larsen KW (2004a) Ecology of North American red squirrels across contrasting habitats: relating natal dispersal to habitat. J Mammal 85:225–236
Haughland DL, Larsen KW (2004b) Exploration correlates with settlement: red squirrel dispersal in contrasting habitats. J Anim Ecol 73:1024–1034
Hosmer DW, Lemeshow S (1989) Applied logistic regression. Wiley, London
Jenness J (2007) Nearest features (nearfeat.avx) estension for ArcView 3.x v. 3.8b. Jenness Enterprises. http://jennessent.com/arcview/nearest_features.htm
Larsen KW, Boutin S (1994) Movements, survival, and settlement of red squirrel (Tamiasciurus hudsonicus) offspring. Ecology 75:214–223
Lima SL, Zollner PA (1996) Towards a behavioral ecology of ecological landscapes. Trends Ecol Evol 11:131–135
Locey KJ, Stone PA (2008) Ontogenetic factors affecting diffusion dispersal in the introduced Mediterranean gecko, Hemidactylus turcicus. J Herpetol 42:593–599
Marshall TC, Slate J, Kruuk LEB, Pemberton JM (1998) Statistical confidence for likelihood-based paternity inference in natural conditions. Mol Ecol 7:639–655
Matthysen E (2005) Density-dependent dispersal in birds and mammals. Ecography 28:403–416
Matthysen E, Currie D (1996) Habitat fragmentation reduces disperser success in juvenile nuthatches Sitta europaea: evidence from patterns of territory establishment. Ecography 19:67–72
Matthysen E, Adriaensen F, Dhondt AA (1995) Dispersal distances of nuthatches, Sitta europaea, in a highly fragmented forest habitat. Oikos 72:375–381
McGarigal K, Marks BJ (1994) Fragstats: spatial pattern analysis program for quantifying landscape structure. Version 2.0. Forest Science Department. Oregon State University, Corvallis
Pulliam HR, Danielson BJ (1991) Sources, sinks, and habitat selection: a landscape perspective on population dynamics. Am Nat 137:S50–S66
Remeš V (2000) How can maladaptive habitat choice generate source–sink population dynamics? Oikos 91:579–582
SAS (1999) SAS/STAT user’s guide, version 8.2. SAS Institute, Cary
Schiegg K, Daniels SJ, Walters JR, Priddy JA, Pasinelli G (2006) Inbreeding in red-cockaded woodpeckers: effects of natal dispersal distance and territory location. Biol Conserv 131:544–552. doi:10.1016/j.biocon.2006.03.001
Schlaepfer MA, Runge MC, Sherman PW (2002) Ecological and evolutionary traps. Trends Ecol Evol 17:474–481
Selonen V, Hanski IK, Desrochers A (2007) Natal habitat-biased dispersal in the Siberian flying squirrel. Proc R Soc Lond B 274:2063–2068
Sheperd BF, Swihart RK (1995) Spatial dynamics of fox squirrels (Sciurus niger) in fragmented landscapes. Can J Zool 73:2098–2105
Stamps JA (1987) The effect of familiarity with a neighborhood on territory acquisition. Behav Ecol Sociobiol 21:274–277
Stenseth NC, Lidicker WZ (1992) Animal dispersal: small mammals as a model. Chapman & Hall, London
Stuart-Smith AK, Boutin S (1995) Behavioral differences between surviving and depredated juvenile red squirrels. Ecoscience 2:34–40
Szulkin M, Sheldon BC (2008) Dispersal as a means of inbreeding avoidance in a wild bird population. Proc R Soc Lond B 275:703–711. doi:10.1098/rspb.2007.0989
Todd R (2000) Microsatellite loci in the Eurasian red squirrel, Sciurus vulgaris L. Mol Ecol 9:2165–2166
Travis JMJ, French DR (2000) Dispersal functions and spatial models: expanding our dispersal toolbox. Ecol Lett 3:163–165
Trizio I, Crestanello B, Galbusera P, Wauters LA, Tosi G, Matthysen E, Hauffe HC (2005) Geographical distance and physical barriers shape the genetic structure of Eurasian red squirrels (Sciurus vulgaris) in the Italian Alps. Mol Ecol 14:469–481
Turchin P (1998) Quantitative analysis of movement: measuring and modeling population redistribution in animals and plants. Sinauer, Sunderland
Van Vuren D, Armitage KB (1994) Survival of dispersing and philopatric yellow-bellied marmots: what is the cost of dispersal? Oikos 69:179–181
Verbeylen G, De Bruyn L, Mattysen E (2003) Patch occupancy, population density and dynamics in a fragmented red squirrel Sciurus vulgaris population. Ecography 26:118–128
Verbeylen G, Wauters LA, De Bruyn L, Matthysen E (2009) Woodland fragmentation affect space use of Eurasian red squirrels. Acta Oecol 35:94–103. doi:10.1016/j.actao.2008.08.005
Vuilleumier S, Fontanillas P (2007) Landscape structure affects dispersal in the greater white-toothed shrew: inference between genetic and simulated ecological distances. Ecol Model 201:369–376
Wauters LA, Casale P (1996) Long-term scatterhoarding in the red squirrel (Sciurus vulgaris). J Zool 238:195–207
Wauters LA, Dhondt AA (1992) Spacing behaviour of the red squirrel, Sciurus vulgaris: variation between habitats and the sexes. Anim Behav 43:297–311
Wauters LA, Dhondt AA (1993) Immigration patterns and success in red squirrels. Behav Ecol Sociobiol 33:159–167
Wauters LA, Dhondt AA (1995) Lifetime reproductive success and its correlates in female Eurasian red squirrels. Oikos 72:402–410
Wauters LA, De Vos R, Dhondt AA (1990) Factors affecting male mating success in red squirrels (Sciurus vulgaris). Ethol Ecol Evol 2:195–204
Wauters L, Hutchinson Y, Parkin DT, Dhondt AA (1994a) The effects of habitat fragmentation on demography and on the loss of genetic variation in the red squirrel. Proc R Soc Lond B 255:107–111
Wauters L, Matthysen E, Dhondt AA (1994b) Survival and lifetime reproductive success in dispersing and resident red squirrels. Behav Ecol Sociobiol 34:197–201
Wauters LA, Casale P, Dhondt AA (1994c) Space use and dispersal of red squirrels in fragmented habitats. Oikos 69:140–146
Wauters LA, Lens L, Dhondt AA (1995) Variation in territory fidelity and territory shifts among red squirrels, Sciurus vulgaris, females. Anim Behav 49:187–193
Wauters LA, Matthysen E, Adriaensen F, Tosi G (2004) Within-sex density dependence and population dynamics of red squirrels Sciurus vulgaris. J Anim Ecol 73:11–25
Wiens JA, Stenseth NC, Van Horne B, Ims RA (1993) Ecological mechanisms and landscape ecology. Oikos 66:369–380
Wolff JO (1994) More on juvenile dispersal in mammals. Oikos 71:349–352
Acknowledgments
We would like to thank all forest owners for their permission to study squirrels on their estates. Constructive criticism by two anonymous referees greatly helped to improve the MS. This study was partly financed by VLINA-project 97.01 of the Flemish Ministry (ANIMAL) and by the European Community (EC-Step-0040 project). Capturing, handling and radio-tracking of squirrels was done in compliance with national regulations.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Wauters, L.A., Verbeylen, G., Preatoni, D. et al. Dispersal and habitat cuing of Eurasian red squirrels in fragmented habitats. Popul Ecol 52, 527–536 (2010). https://doi.org/10.1007/s10144-010-0203-z
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10144-010-0203-z