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Ecological correlates of trap response of a Neotropical forest rodent, Proechimys semispinosus

Published online by Cambridge University Press:  10 July 2009

Gregory H. Adler  and
Thomas D. Lambert
Gregory H. Adler
Affiliation:
Department of Biology and Microbiology, University of Wisconsin – Oshkosh, Oshkosh, WI 54901, USA
Thomas D. Lambert
Affiliation:
Department of Biology and Microbiology, University of Wisconsin – Oshkosh, Oshkosh, WI 54901, USA
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Abstract

Patterns of trap response in the Central American spiny rat (Proechimys semispinosus), a frugivorous forest rodent, were examined in relation to age, sex, density and resource abundance. Populations on four small islands (designated numbers 4, 8, 14, and 52) in Gatun Lake (central Panama) were sampled by live-trapping for four nights every month for four years. Trappability was calculated as the proportion of all individuals known to be alive that were actually captured. Mean body mass at first capture was within the range of subadult body masses and differed among islands but not between sexes. Trappabilities summed over the entire study were generally low and differed among islands and age classes (juveniles, subadults and adults) and between sexes. In general, adults were more trappable than juveniles and subadults, and females (particularly adults) were more trappable than males. Trappability and the number of captures per individual varied seasonally and were generally greatest during December and January. Monthly estimates of these two variables were examined for autocorrelation, and the order of the autoregressive error model was determined separately for each island population. The arcsine of trappability and the number of captures per individual were regressed on log10 densities of spiny rats and of fruiting trees and lianas after controlling for autocorrelation. Both trappability indices were negatively related to the density of fruiting trees and lianas on islands 8 and 14, indicating that spiny rats may be seasonally food-stressed. The number of captures per individual was related positively to the density of spiny rats on island 52 and negatively on island 8. Results indicate that spiny rat populations must be sampled with greater intensity and duration than temperate forest rodents.

Keywords

islandsPanamaProechimys semispinosusrodentsspiny rattrap response
Type
Research Article
Information
Journal of Tropical Ecology , Volume 13 , Issue 1 , January 1997 , pp. 59 - 68
Copyright
Copyright © Cambridge University Press 1997

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References

LITERATURE CITED

Adler, G. H. 1994. Tropical forest fragmentation and isolation promote asynchrony among populations of a frugivorous rodent. Journal of Animal Ecology 63:903–911.CrossRefGoogle Scholar
Adler, G. H. 1995. Fruit and seed exploitation by Central American spiny rats, Proechimys semispinosus. Studies on Neotropical Fauna and Environment 30:237–244.CrossRefGoogle Scholar
Adler, G. H., Endries, M. & Piotter, S. 1996. Spacing patterns within populations of a tropical forest rodent, Proechimys semispinosus, on five Panamanian islands. Journal of Zoology, London, in press.CrossRefGoogle Scholar
Adler, G. H. & Seamon, J. O. 1991. Distribution and abundance of a tropical rodent, the spiny rat, on islands in Panama. Journal of Tropical Ecology 7:349–360.CrossRefGoogle Scholar
Chatfield, C. 1975. The analysis of time series: theory and practice. Chapman and Hall, London, UK.CrossRefGoogle Scholar
Fleming, T. H. 1971. Population ecology of three species of Neotropical rodents. Miscellaneous Publications of the Museum of Zoology, University of Michigan, No. 143, pp. 1–77.Google Scholar
Foster, R. B. 1982. The seasonal rhythm of fruitfall on Barro Colorado Island. Pp. 151–172 in Leigh, E. G. Jr., Rand, A. S. & Windsor, D. M. (eds). The ecology of a tropical forest: seasonal rhythms and long-term changes. Smithsonian Institution Press, Washington, DC, USA.Google Scholar
Gliwicz, J. 1983. Age indicators in the spiny rat, Proechimys semispinosus. Tropical Ecology 24:299–304.Google Scholar
Gliwicz, J. 1984. Population dynamics of the spiny rat Proechimys semispinosus on Orchid Island (Panama). Biotropica 16:73–78.CrossRefGoogle Scholar
González, -M. & Alberico, M. 1993. Selection de habitat en una comunidad de mamiferos pequeños en la costa Pacifica de Colombia. Caldasia 17:313–324.Google Scholar
Grizzle, J. E., Starmer, C. F. & Koch, G. G. 1969. Analysis of categorical data by linear models. Biometrics 25:489–504.CrossRefGoogle ScholarPubMed
Kleinbaum, D. G. & Kupper, L. L. 1978. Applied regression analysis and other multivariable methods. Duxbury Press, North Scituate, MA, USA.Google Scholar
Krebs, C. J. & Boonstra, R. 1984. Trappability estimates for mark-recapture data. Canadian Journal of Zoology 62:2440–2444.CrossRefGoogle Scholar
Nichols, J. D. & Pollock, K. H. 1983. Estimation methodology in contemporary small mammal capture-recapture studies. Journal of Mammalogy 64:253–260.CrossRefGoogle Scholar
Rudd, R. L. 1979. Is the tropical small mammal collector a fruiting tree? Malayan Nature Journal 33:71–74.Google Scholar
SAS Institute, Inc. 1993. SAS/ETS user's guide, version 6, 2nd ed.Cary, NC, USA.Google Scholar
Shumway, R. H. 1988. Applied statistical time series analysis. Prentice Hall, Englewood Cliffs, NJ, USA.Google Scholar
Verdú, M. & García-Fayos, . 1994. Correlations between the abundances of fruits and frugivorous birds: the effect of temporal autocorrelation. Acta Œcologica 15:791–796.Google Scholar
Windsor, D. M. 1990. Climate and moisture variability in a tropical forest: long-term records from Barro Colorado Island, Panama. Smithsonian Contributions to the Earth Sciences 29:1–145.CrossRefGoogle Scholar
Wright, S. J. 1979. Competition between insectivorous lizards and birds in central Panama. American Zoologist 19:1145–1156.CrossRefGoogle Scholar
Wright, S. J. 1985. How isolation affects rates of turnover of species on islands. Oikos 44:331–338.CrossRefGoogle Scholar