caa a22 4500 606228101 CHVBK 20210128101202.0 cr unu---uuuuu 210128e20150501xx s 000 0 eng 10.1007/s10641-014-0354-4 doi (NATIONALLICENCE)springer-10.1007/s10641-014-0354-4 Fish assemblage and environmental differences upstream and downstream of a cave: a potential reset mechanism [Elektronische Daten] [Alison Coulter, Tracy Galarowicz] The traditional view of stream systems, exemplified by the river continuum concept, shows predictable shifts in species composition and ecosystem function based on changes in nutrients and energy. Usually headwaters have fewer species, lower nutrients and greater habitat variability than downstream sites. The modern view of stream systems is much more complex with disturbances altering expected environmental conditions and assemblages. Reset mechanisms function to change the expected downstream biotic assemblages so that they resemble what would be expected at an upstream location. The presence of a reset mechanism may be indicated by a variety of factors including decreases in biomass and diversity. To assess the potential impacts of a cave, which can impact a variety of hydrologic factors including temperature, fish assemblages and environmental conditions were sampled around a cave. Differences were seen both in assemblage and environmental conditions between sites located upstream and downstream of a cave; variation in assemblage and environment also occurred at a 10m scale. Overall, species diversity and richness were lower downstream of the cave, resembling a headwater-like site. There was a shift from warmer water species upstream to an assemblage defined by high abundances of mottled sculpin and the presence of brown trout. These differences in assemblage were linked with environmental conditions, including temperature, that were likely influenced by the presence of the cave. Results of this study indicate that, in this case, a cave has impacted fish assemblages and the surrounding stream ecosystem and may be functioning as a reset mechanism, resulting in decreased species diversity and changes in assemblage composition over a short distance. Springer Science+Business Media Dordrecht, 2014 Cave nationallicence Reset mechanism nationallicence River continuum concept nationallicence Scale nationallicence Fish assemblages nationallicence Coulter Alison Department of Natural Resources, Purdue University, 195 Marstellar St., 47907, West Lafayette, IN, USA aut Galarowicz Tracy Department of Biology, Central Michigan University, 217 Brooks Hall, 48859, Mt. Pleasant, MI, USA aut Environmental Biology of Fishes Springer Netherlands 98/5(2015-05-01), 1223-1231 0378-1909 98:5<1223 2015 98 10641 https://doi.org/10.1007/s10641-014-0354-4 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10641-014-0354-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Coulter Alison Department of Natural Resources, Purdue University, 195 Marstellar St., 47907, West Lafayette, IN, USA aut NATIONALLICENCE 700 1- Galarowicz Tracy Department of Biology, Central Michigan University, 217 Brooks Hall, 48859, Mt. Pleasant, MI, USA aut NATIONALLICENCE 773 0- Environmental Biology of Fishes Springer Netherlands 98/5(2015-05-01), 1223-1231 0378-1909 98:5<1223 2015 98 10641