Abstract
We examined the potential importance of distance from the spring source (reach), season, and physicochemical variability on zoobenthic biodiversity, biomass, and trait-based metrics [functional feeding groups (FFG) and habit traits] in three karst spring systems in the Ozarks region of Missouri, USA. Density and biomass were measured during summer and winter in each spring source and three downstream reaches of each springbrook. Nearly 20,000 invertebrates in total were collected, identified, and counted. We measured biomass directly or by length–weight relationships. Overall downstream and seasonal patterns of diversity, biomass, and traits were similar among springs, but species dominance and composition varied significantly. Taxonomic richness increased downstream in all springs, but evenness decreased. Amphipods and isopods were the most abundant taxa at the spring source but were progressively replaced downstream by insects (with dominance varying among springs and seasons). Density and biomass for flatworms, snails, and insects increased downstream, while crustacean numbers diminished along this ecotone. FFG increased from 3 at the spring source (mostly shredders) to 4–7 downstream where scrapers, collectors, and/or predators predominated. Physicochemical factors proved minor at best as mechanistic explanations for ecotonal changes. We conclude that structural and functional community changes could be attributed to a matrix of interrelated factors including organic substrate, food availability, and biotic interactions.
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Acknowledgments
We thank R.T. Pavlowsky, Marc Owen, and staff at the Ozarks Environmental and Water Resources Institute (OEWRI) at Missouri State University for their support. Special thanks are owed to spring owners T. Lynch, R. Campbell, and R. Lovett. We appreciate the help of L. Bullard from the Watershed Committee of the Ozarks for his assistance with locating the spring sites and sharing his expertise on spring ecosystems. We thank L.A. Bennett, M.A. Blackwood, and C. Freeman from the University of Kansas and J. Shepard and C. Copper for lab and field assistance. Comments from anonymous reviewers helped improve this final manuscript.
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Carroll, T.M., Thorp, J.H. Ecotonal shifts in diversity and functional traits in zoobenthic communities of karst springs. Hydrobiologia 738, 1–20 (2014). https://doi.org/10.1007/s10750-014-1907-4
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DOI: https://doi.org/10.1007/s10750-014-1907-4