Peninsula Effects on Birds in a Coastal Landscape: Are Coves More Species Rich than Lobes?

  • Sam Riffell Department of Wildlife, Department of Fisheries and Aquaculture, Mississippi State, MS 39762, United States
  • Brian Keas Department of Biological and Allied Health Sciences, Ohio Northern University, Ada, OH 45810, United States
  • Thomas Burton Zoology Department, Michigan State University, East Lansing, MI 48824, United States
Keywords: Birds, Coastal wetlands, Great lakes, Peninsula effect


Peninsula effects - decreasing richness with increasing distance along peninsula lobes - have been identified for many taxa on large peninsulas. Peninsula effects are caused by differences in colonization and extinction predicted by island biogeography or by environmental gradients along the peninsula. We compared species-area regressions for cove patches (i.e., mainland) to regressions for lobe patches (i.e., on peninsula tips) for wet meadow birds along a highly interdigitated shoreline (northern Lake Huron, USA). We conducted analysis both with and without accounting for variation in habitat and landscape characteristics (i.e., environmental gradients) of wet meadows. Species-area regressions for coves did not differ from lobes, nor did these results differ when we accounted for gradients. Similarly, few species were more abundant in coves. Peninsula effects may have been lacking because lobe patches were located ≈ 800 m on average from the mainland, and birds are highly mobile and can easily sample patches over these distances. One important caveat was that wet meadow patches > 5 ha were located in coves, so coves would still be important considerations in conservation plans because of the contribution of large patches to reproductive success, dispersal and population dynamics.

How to Cite
Riffell, S.; Keas, B.; Burton, T. Peninsula Effects on Birds in a Coastal Landscape: Are Coves More Species Rich Than Lobes?. LO 2012, 29, 1-15.
Research Article