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

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