Abstract
In a four year study data on the presence of red squirrel were collected in an agricultural landscape by counting dreys in 49 woods ranging from 0.5 to 14 ha, and differing in quality of habitat and isolation.
Logit regression analysis showed that the area per woodlot covered with conifers is a good predictor of squirrel presence for each year and during the whole period, but the significance of the regression decreases with time. During the study the number of woods occupied by red squirrel increased, and smaller woods and those without conifers also became inhabited. This trend is in accordance with the positive effect of time in regression analyses on the presence of the species and on the colonization of woods, and it suggests an increase of squirrel numbers in the area. Addition of several isolation variables in the regression analyses showed significant effects in different years, and the effect of isolation was independent of time. In the first two years the area of habitat around a woodlot, the distance to the nearest woodlot larger than 30 ha, and the density of possible movement corridors have significant effects on the presence of red squirrel.
In the last two years, with presumably a high number of squirrels, the (short) distance to the nearest woodlot and also the area of habitat around woods have significant effects. It is concluded that the spatial dynamics of the population can be understood as the outcome of individual spatial behaviour, rather than as the result of metapopulation processes.
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References
Andrén, H. and Lemnell, P.-A. 1992. Population fluctuations habitat selection in the Eurasian red squirrel Sciurus vulgaris. Ecography 15: 303–307.
Belovsky, G.E. 1987. Extinction models and mammalian persistance. In Viable populations for conservation. Edited by M.E. Soulé. Cambridge University Press, Cambridge, England.
Boorman, S.A. and Levitt, P.R. 1973. Group selection on the boundary of a stable population. Theor. Pop. Biol. 4: 85–128.
Bowers, M.A. and Dooley, J.L. jr. 1991. Landscape composition and the intensity and outcome of two species competition. Oikos 60: 180–186.
Brewer, B.A., Lacy, R.C., Foster, M.L. and Alaks, G. 1990. Inbreeding depression in insular and central populations of Peromyscus mice.J. of Heredity 81: 257–266.
Celada, C., Bogliani, G., Gariboldi, A. and Maracci, A. Occupancy of isolated woodlots by the red squirrel Sciurus vulgaris L., in Italy. In press.
Corbet, G.B. and Southern, H.N. (eds.) 1977. The handbook of British mammals. Blackwell Scientific Publications, London, England.
Danielson, B.J. 1991. Communities in a landscape: the influence of habitat heterogeneity on the interactions between species. Am. Nat. 138: 1105–1120.
DuMouchel, W. and Waternaux, C. 1983. Some new dichotomous regression methods. In Recent advantages in statistics. Edited by M.H. Rizvi, J.S. Rustagi and D. Siegmond. Academic Press, New York.
Genstat 5 Committee 1987. Genstat 5 reference manual. Claredon Press, Oxford, England.
Goodman, D. 1987. The demography of chance extinction. In Viable populations for conservation. Edited by M.E. Soulé. Cambridge University Press, Cambridge, England.
Gurnell, J. 1987. The natural history of squirrels. Christopher Helm, London, England.
Jongman, R.H.G., Ter Braak, C.J.F. and Van Tongeren, O.F.R. 1987. Data analysis in community and landscape ecology. Pudoc, Wageningen, The Netherlands.
Levins, R. 1970. Extinction. In Some mathematical questions in biology. Lectures on mathematics in the Life Sciences Vol 2: 75–101. Am. Math. - Soc., Rhode Island, USA.
Merriam, G. and Wegner, J. 1992. Local extinctions, habitat fragmentation, and ecotones. In Landscape Boundaries: consequences for biotic diversity and ecological flows. Edited by A.J. Hansen and F. di Castri. Springer Verlag, Berlin, Germany.
Pulliam, H.R. 1988. Sources, sinks, and population regulation. Am. Nat. 132: 652–661.
Van Apeldoorn, R.C., Oostenbrink, W.T., Van Winden, A. and Van der Zee, F.F. 1992. Effects of habitat fragmentation on the bank vole, Clethrionomys glareolus in an agricultural landscape. Oikos 65: 265–274.
Verboom, B. and Van Apeldoorn, R.C. 1990. Effects of habitat fragmentation on the red squirrel, Sciurus vulgaris L. Landscape Ecol. 4: 171–176.
Wauters, L.A. and Dhondt, A.A. 1986. Dichtheid en home ranges van een populatie eekhoorns Sciurus vulgaris L., 1758 in België. Lutra 29: 243–260 (with English summary).
Wauters, L.A. and Dhondt, A.A. 1988. The use of red squirrel (Sciurus vulgaris) dreys to estimate population density. J. Zool. 214: 179–187.
Wauters, L. and Dhondt, A.A. 1989. Body weight, longevity and reproductive success in red squirrels (Sciurus vulgaris). J. Anim. Ecol. 58: 637–651.
Wauters, L. and Dhondt, A.A. 1992. Spacing behaviour of red squirrels, Sciurus vulgaris variation between habitat and the sexes. Anim. Behav. 43: 297–311.
Wauters, L., Swinnen, C. and Dhondt, A.A. 1992. Activity budget and foraging behaviour of red squirrels (Sciurus vulgaris) in coniferous and deciduous habitats. J. Zool. Lond. 227: 71–86.
Wildt, D.E., Bush, M., Goodrowe, K.L., Packer, C., Pusey, A.E., Brown, J.L., Joslin, P. and O'Brien, S.J.O. 1987. Reproductive and genetic consequences of founding isolated lion populations. Nature 329: 328–331.
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van Apeldoorn, R.C., Celada, C. & Nieuwenhuizen, W. Distribution and dynamics of the red squirrel (Sciurus vulgaris L.) in a landscape with fragmented habitat. Landscape Ecol 9, 227–235 (1994). https://doi.org/10.1007/BF00134749
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DOI: https://doi.org/10.1007/BF00134749