NDLI: Distribution of freshwater diatom Didymosphenia geminata in streams in the Sierra Nevada, USA, in relation to water chemistry and bedrock geology

Content Provider	Springer Nature Link
Author	Rost, Andy L. Fritsen, Christian H. Davis, Clinton J.
Copyright Year	2011
Abstract	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.
Starting Page	157
Ending Page	167
Page Count	11
File Format	PDF
ISSN	00188158
Journal	Hydrobiologia
Volume Number	665
Issue Number	1
e-ISSN	15735117
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-02-22
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Didymosphenia geminata Stalked diatoms Water chemistry Bedrock geology Nuisance algal blooms Zoology Ecology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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