Event Title

Response of Benthic Macroinvertebrate Communities to Variations in Discharge during the Fall Months of 2015 and 2016 in the Upper Main Stem of the Susquehanna River

Presenter Information

Marta Mendez, Susquehanna University

Faculty Advisor

Jack Holt

Start Date

25-4-2017 5:00 PM

End Date

25-4-2017 6:00 PM

Description

In this eighth year of a long-term study of benthic macro invertebrate communities (BMI) in the upper main stem of the Susquehanna River, we use BMI communities to assess the river health to reflect both water quality and habitat variation. Flow regimes of 2015 during summer showed 317% increase from 79 year average (July 2015, using the Sunbury USGS gage). Bray-Curtis showed 47% similarity during summer 2015, but fell to 38% during the same period in 2016. Low flow had the greatest negative impact on the individuals of he %EPT, with the exception of Heptageniidae. The Hilsenhoff Biotic Index (HBI) score rose at sites 1 and 2 from 4.024 and 3.188 in 2015 to 5.615 and 3.746 in 2016. Shannon Diversity Index (SDI) increased from 2015 (1.59 and 1.03) to 2016 (1.78 and 1.41). These results underscore the importance of multiyear sampling in assessments of environments as variable as large rivers.

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Apr 25th, 5:00 PM Apr 25th, 6:00 PM

Response of Benthic Macroinvertebrate Communities to Variations in Discharge during the Fall Months of 2015 and 2016 in the Upper Main Stem of the Susquehanna River

In this eighth year of a long-term study of benthic macro invertebrate communities (BMI) in the upper main stem of the Susquehanna River, we use BMI communities to assess the river health to reflect both water quality and habitat variation. Flow regimes of 2015 during summer showed 317% increase from 79 year average (July 2015, using the Sunbury USGS gage). Bray-Curtis showed 47% similarity during summer 2015, but fell to 38% during the same period in 2016. Low flow had the greatest negative impact on the individuals of he %EPT, with the exception of Heptageniidae. The Hilsenhoff Biotic Index (HBI) score rose at sites 1 and 2 from 4.024 and 3.188 in 2015 to 5.615 and 3.746 in 2016. Shannon Diversity Index (SDI) increased from 2015 (1.59 and 1.03) to 2016 (1.78 and 1.41). These results underscore the importance of multiyear sampling in assessments of environments as variable as large rivers.