2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/21/2019  |   2:45 PM - 3:00 PM   |  BIOGEOGRAPHY OF BACTERIA IN HEADWATER STREAMS ACROSS BIOMES AND SEASONS   |  150 G

BIOGEOGRAPHY OF BACTERIA IN HEADWATER STREAMS ACROSS BIOMES AND SEASONS

Benthic microbial communities of headwater streams conduct important processes for maintaining critical stream ecosystem functions both within headwaters and downstream. Not all headwater communities are equal and there is a growing effort to understand which factors are responsible for differences among them and more generally to understand the utility and limitations of bacterial biogeography information. Using three well-studied catchments, White Clay Creek (PA, USA), Neversink River (NY, USA) and Rio Tempisquito (Costa Rica), we examined the influence of catchment, season, substrate type (rock vs. sediment), stream order, and water chemistry on the composition of streambed microbial communities characterized by 16S rRNA genes. The direction and magnitude of change in bacterial richness between stream orders depended on catchment, substrate, and season. Partial redundancy analysis showed that substrate type (8.1%) was more influential than catchment (4.6%), season (1.8%), and stream order (1.5%) in structuring bacterial community composition. Relative abundance of Cyanobacteria was seven times greater in rock biofilms than sediments, while Acidobacteria had twice the relative abundance in sediments compared with rock biofilms. Our results suggest that changes in benthic substrate could substantially alter the biogeography of bacteria in headwater streams, globally.

  • Biodiversity
  • Distribution
  • Sediment

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Presenters/Authors

Raven Bier (), Stroud Water Research Center, raven.bier@gmail.com;


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Jennifer Mosher (), Marshall University, mosher@marshall.edu;


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Louis Kaplan (), Stroud Water Research Center, lakaplan@stroudcenter.org;


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Jinjun Kan (), Stroud Water Research Center, jkan@stroudcenter.org;


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