caa a22 4500 445893923 CHVBK 20180317145625.0 cr unu---uuuuu 170323e20110501xx s 000 0 eng 10.1007/s10750-011-0617-4 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0617-4 Distribution of freshwater diatom Didymosphenia geminata in streams in the Sierra Nevada, USA, in relation to water chemistry and bedrock geology [Elektronische Daten] [Andy Rost, Christian Fritsen, Clinton Davis] The freshwater stalked diatom, Didymosphenia geminata, has increased its proliferation in new and native ranges with the potential for significant ecological impacts to streams around the world. Uncertainty remains regarding the water chemistry in which D. geminata thrives despite recent advances in the understanding of its suitable physical habitat. Stream surveys were conducted in the central and the northern Sierra Nevada, CA, USA, to determine whether D. geminata distribution patterns were related to water chemistry and bedrock geology. Surveys included measurements of physical, chemical, and biological parameters from 50 stream reaches in 35 different streams. The water chemistry variable, percent Ca2+ (P<0.001) provided the best fit models (binary logistic regression AUC 0.84) for predicting the presence of D. geminata in Sierra Nevada streams. Other significant water chemistry predictors included the percent SO4 2− and Mg2+ concentrations. The bedrock geology variable, percent meta-sedimentary rock in a watershed (P<0.001), provided the best fit model (binary logistic regression AUC 0.77) for predicting the presence of D. geminata. This study further defines the environmental conditions in which D. geminata thrives, provides insight into D. geminata ecophsyiology, and will help refine current distribution and risk assessment models. Springer Science+Business Media B.V., 2011 Didymosphenia geminata nationallicence Stalked diatoms nationallicence Water chemistry nationallicence Bedrock geology nationallicence Nuisance algal blooms nationallicence Rost Andy Science and Technology Department, Sierra Nevada College, 999 Tahoe Boulevard, 89451, Incline Village, NV, USA aut Fritsen Christian Division of Earth and Ecosystem Sciences, Desert Research Institute, 2215 Raggio Parkway, 89512, Reno, NV, USA aut Davis Clinton Division of Earth and Ecosystem Sciences, Desert Research Institute, 2215 Raggio Parkway, 89512, Reno, NV, USA aut Hydrobiologia Springer Netherlands 665/1(2011-05-01), 157-167 0018-8158 665:1<157 2011 665 10750 https://doi.org/10.1007/s10750-011-0617-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0617-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rost Andy Science and Technology Department, Sierra Nevada College, 999 Tahoe Boulevard, 89451, Incline Village, NV, USA aut NATIONALLICENCE 700 1- Fritsen Christian Division of Earth and Ecosystem Sciences, Desert Research Institute, 2215 Raggio Parkway, 89512, Reno, NV, USA aut NATIONALLICENCE 700 1- Davis Clinton Division of Earth and Ecosystem Sciences, Desert Research Institute, 2215 Raggio Parkway, 89512, Reno, NV, USA aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 665/1(2011-05-01), 157-167 0018-8158 665:1<157 2011 665 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer