2022 Early Hearing Detection & Intervention Virtual Conference

March 13 - 15, 2022

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5/23/2018  |   10:15 AM - 10:30 AM   |  NUTRIENT ENRICHMENT TRIGGERS SWITCH IN THE DOMINANT MODE OF TEMPORAL β-DIVERSITY IN FRESHWATER ALGAL COMMUNITIES   |  420 A

NUTRIENT ENRICHMENT TRIGGERS SWITCH IN THE DOMINANT MODE OF TEMPORAL β-DIVERSITY IN FRESHWATER ALGAL COMMUNITIES

Nutrient enrichment can alter natural patterns of community succession in freshwater ecosystems. We sampled 35 streams bimonthly for 2 y that spanned a steep gradient of total phosphorus (TP, <10 to 150 μg/L) to determine how TP enrichment influenced variation in algal species biovolumes and composition (i.e. temporal β-diversity). While temporal β-diversity displayed no relationship with TP concentration, a new method of partitioning turnover into components that measure balanced variation in abundances (βBAL) and abundance-gradients (βGRA) revealed striking differences in the mode of community turnover as P enrichment increased. At low TP exposure (< 25 μg/L), seasonal variation in algal communities was dominated by βBAL; as biovolumes of some species declined they were substituted by similar increases in biovolumes from other species. This pattern shifted abruptly at 21-28 μg/L TP enrichment with βGRA increases, which was driven by a subset of the species pool increasing in biovolume during the cooler winter and spring months (primarily the nuisance algae Cladophora glomerata). Though algal communities showed high levels of unpartitioned temporal β-diversity across the TP gradient, our results show the importance of identifying the source of community variation in freshwater algae.

  • Phosphorous
  • Biological Gradients & Thresholds
  • Community

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Presenters/Authors

Stephen C. Cook (), University of Oklahoma, stephencook@ou.edu;


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Jeffrey A. Back (), Baylor University, Jeff_Back@baylor.edu;


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Ryan S. King (), Baylor University, Ryan_S_King@baylor.edu;


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