as told by the types and biomass of stream bugs

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Presentation transcript:

Both pollutants and altered hydrology negatively affect stream life in ACC as told by the types and biomass of stream bugs Amy Rosemond1, Jessica Sterling1,2, Phillip Bumpers1,3, Seth Wenger 1,3 1Odum School of Ecology, University of Georgia, Athens, GA 2Chattahoochee Riverkeeper, Atlanta, GA 3River Basin Center, University of Georgia, Athens, GA

Conceptual model of urbanization effects on streams; Wenger et al. 2009

Framework links management decisions to stream health Stressors Responses Hydrology Pollutants Measures of health Complex decisions/ desired protection

Is it a hydrology or pollutant problem? USGS, Frank Ippolito 2010

How many species and which species of ‘stream bugs’ are present How many species and which species of ‘stream bugs’ are present? Are species sensitive to or tolerant of pollution?

How much are present? Reduced numbers/biomass of ‘stream bugs’ may indicate effects of hydrology

How much are present? Lots of bugs = healthy stream

This study – 32,900 invertebrates identified and measured! Biomass: Quantitative sampling, identify and measure all bugs present (replicate samples per stream) This study – 32,900 invertebrates identified and measured! Surber sampler – Wildco/Cole Parmer

Sites sampled in this study Increased watershed urbanization gradient: Rural, mixed use, suburban, urban Sterling et al. 2016

Biomass ↓ high in Rural, lower in other sites % impervious surface cover = urbanization Number of species↓ 30 vs 15; Biotic index scores good/fair to fair/poor Biomass ↓ high in Rural, lower in other sites # species Losing Biodiversity and function! Sterling et al. 2016

Biomass↓ of even tolerant bugs Evidence that both pollution and hydrology are affecting ACC streams Sterling et al. 2016

Good news: many management decisions can address both stressor types: slowing stormwater, promoting natural filtration, rain gardens, stream buffers, etc. Management Stressors Responses Hydrology Pollutants Measures of health Complex decisions/ desired protection

Acknowledgements Collaboration with Athens-Clarke County Stormwater Division – grant-writing, data, ideas Ryan Eaves, Jason Peek, Adam Gaufaurian Sample collection and processing Reid Brown, Caitlin Ward Ideas, experimental design, data analysis Mary Freeman, Marirosa Molina