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as told by the types and biomass of stream bugs

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Presentation on theme: "as told by the types and biomass of stream bugs"— Presentation transcript:

1 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

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

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

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

5 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?

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

7 How much are present? Lots of bugs = healthy stream

8 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

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

10 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

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

12 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

13 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

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