caa a22 4500 469097299 CHVBK 20180323133034.0 cr unu---uuuuu 170328e19920201xx s 000 0 eng 10.1007/BF00317215 doi (NATIONALLICENCE)springer-10.1007/BF00317215 Wurtsbaugh Wayne Department of Fisheries and Wildlife/Ecology Center, Utah State University, 84322-5210, Logan, UT, USA aut Food-web modification by an invertebrate predator in the Great Salt Lake (USA) [Elektronische Daten] [Wayne Wurtsbaugh] Summary: During unusually wet years the salinity of the Great Salt Lake (Utah) decreased from above 100 g/L to 50 g/L. This allowed the predaceous insect Trichocorixa verticalis to invade the pelagic region of the lake and reach a mean summer density of 52/m3. Concurrent changes in the pelagic ecosystem were: a decrease in the dry biomass of the previously dominant filter-feeding brine shrimp Artemia franciscana from 720 to 2 mg/m3, the invasion of three other zooplankton taxa, a 10 × decrease in community filtration rate, a 20 × increase in chlorophyll a concentration, a 4 × decrease in water clarity and perhaps a decrease in soluble nutrients. Trichocorixa abundance was also inversely correlated with the abundance of Artemia along a salinity gradient in the lake's estuary. In a 9-d microcosm experiment Trichocorixa preyed on nauplii and decreased the total density of Artemia from 103 to 6/L. The reduction in Artemia allowed protozoans to increase 10-100 ×. Changes in chlorophyll and clarity were consistent with those observed in the lake. These results suggest that invertebrate predation may be an important factor structuring simple food webs such as those found in moderately saline lakes. Springer-Verlag, 1992 Saline lakes nationallicence Artemia nationallicence Predation nationallicence Trophic cascade nationallicence Microbial nationallicence Oecologia Springer-Verlag 89/2(1992-02-01), 168-175 0029-8549 89:2<168 1992 89 442 https://doi.org/10.1007/BF00317215 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00317215 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Wurtsbaugh Wayne Department of Fisheries and Wildlife/Ecology Center, Utah State University, 84322-5210, Logan, UT, USA aut NATIONALLICENCE 773 0- Oecologia Springer-Verlag 89/2(1992-02-01), 168-175 0029-8549 89:2<168 1992 89 442 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer