Designing Wetlands for Amphibians: The Importance of Predatory Fish and Shallow Littoral Zones in Structuring of Amphibian Communities Article Received: 13 May 2003 Accepted: 03 June 2004 DOI:
Cite this article as: Porej, D. & Hetherington, T. Wetlands Ecol Manage (2005) 13: 445. doi:10.1007/s11273-004-0522-y Abstract
Under section 401 and section 404 of the Clean Water Act, permission to degrade existing natural wetlands in the USA may be conditional on restoring or creating ‘replacement’ wetlands. Success of wetland mitigation efforts in adequately replacing lost wildlife habitats depends on our good understanding of key ecological attributes that affect the structure of wetland faunal communities. We examined the effects of the presence of predatory fish, shallow vegetated littoral zone, emergent vegetation cover, wetland age and size on amphibian diversity in 42 replacement wetlands located in the Ohio’s North Central Tillplain ecoregion. We recorded 13 species of pond-breeding amphibians, and the average local species richness (
α-richness) was 4.2 ± 1.7 species per site (range 1–7). There is strong evidence for the positive association between amphibian species richness and presence of a shallow littoral zone, and the negative association with presence of predatory fish. There was no evidence for the association between species richness and age, size, amount of forest cover within 200 m, nor the amount of emergent vegetation cover at the study sites. It is estimated that local species richness in wetlands with shallows was 1.76 species higher on average than in wetlands without shallows (95% CI from 0.75 to 2.76). The presence of predatory fish was associated with an average reduction in species richness by an estimated 1.21 species (95% CI from 0.29 to 2.11). Replacement wetlands were placed in areas with little or no existing forest cover, and amphibian species associated with forested wetlands were either rare (eastern newt, spotted salamander) or not present at all (marbled salamander, wood frog). In addition, we surveyed all replacement wetlands constructed under section 401 in Ohio since 1990, and found that predatory fish were present in 52.4% of the sites and that shallows were absent from 42.7% of the sites. Our results indicate that current wetland replacement practices could have a negative effect on the amphibian diversity within our region. Key words Ambystoma American bullfrog amphibian community colonization green frog habitat restoration leopard frog Ohio predation small-mouthed salamander wetland mitigation References Adams, M.J. 1999 Correlated factors in amphibian decline: Exotic species and habitat change in western Washington J. Wildlife Manage. 63 1162 1171 Google Scholar Adams, M.J., Richter, K.O., Leonard, W.P. 1997 Surveying and monitoring amphibians using aquatic funnel traps Olson, D.H. Leonard, W.P. Bury, R.B. eds. Sampling Amphibians in Lentic Habitats Methods and Approaches for the Pacific Northwest. Society for Northwestern Vertebrate Biology Olympia WAUSA 47 54 Google Scholar Adams, M.J., Pearl, C.A., Bury, R.B. 2003 Indirect facilitation of an anuran invasion by non-native fishes Ecol. Lett. 6 343 352 CrossRef Google Scholar Brown, L., Downhower, J.F. 1988Analyses in Behavioral Ecology Sinauer Associates SunderlandMAUSA Google Scholar
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