Winter filtering, immigrant selection and species composition of insular mammals of Lake Huron

Winter filtering, immigrant selection and species composition of insular mammals of Lake Huron Patterns in species composition of small mammals on islands of northwestern Lake Huron, USA were studied to test the hypothesis that insular community structure was strongly influenced by immigrant selection, l e, selection for the more vagile species Of 17 insectivores and rodents in the mainland pool nine were detected on at least one of the 25 islands studied These species comprised a biased subset of the mainland pool, biased in favor of species with relatively good winter immigration abilities The five true hibernators were absent from all islands studied and the two winter‐inactive species occurred on just two islands Frequency of insular occurrence increased with level of winter activity (hibernator vs winter‐inactive vs winter‐active) and with body size (p < 0.02) The winter filtering effect remains one of the best documented forms of immigrant selection In general however, insular community structure is influenced by the combined effects of selective extinction as well as selective immigration Common insular species are those which combine relatively high immigration abilities with low resource requirements http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Ecography Wiley

Winter filtering, immigrant selection and species composition of insular mammals of Lake Huron

Ecography, Volume 16 (1) – Jan 1, 1993

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Publisher
Wiley
Copyright
Copyright © 1993 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0906-7590
eISSN
1600-0587
DOI
10.1111/j.1600-0587.1993.tb00055.x
Publisher site
See Article on Publisher Site

Abstract

Patterns in species composition of small mammals on islands of northwestern Lake Huron, USA were studied to test the hypothesis that insular community structure was strongly influenced by immigrant selection, l e, selection for the more vagile species Of 17 insectivores and rodents in the mainland pool nine were detected on at least one of the 25 islands studied These species comprised a biased subset of the mainland pool, biased in favor of species with relatively good winter immigration abilities The five true hibernators were absent from all islands studied and the two winter‐inactive species occurred on just two islands Frequency of insular occurrence increased with level of winter activity (hibernator vs winter‐inactive vs winter‐active) and with body size (p < 0.02) The winter filtering effect remains one of the best documented forms of immigrant selection In general however, insular community structure is influenced by the combined effects of selective extinction as well as selective immigration Common insular species are those which combine relatively high immigration abilities with low resource requirements

Journal

EcographyWiley

Published: Jan 1, 1993

References

  • Mammalian community structure on islands immigration, extinction and interactive effects
    Lomolino, Lomolino
  • Bioenergetics of cross‐ice movements by Microtus pennsylvanicus. Peromyscus leucopus and Blarina brevicauda
    Lomolino, Lomolino

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