Macroinvertebrates are insects, snails, worms, and other aquatic organisms. We use them as bioindicators of aquatic ecosystems' "quality," or integrity.
Our group performs research on different human activities and how they relate to macroinvertebrate communities. We work closely with chemists, fisheries experts and other colleagues to analyze diverse data sets and understand stressors on aquatic ecosystems.
​Recent activity
2/26/2020 Stef Kroll presented "Stream Restoration in the Delaware Basin: Insects as Bioindicators" at the American Entomological Society's February 2020 Meeting. 
2/12/2020 Stef Kroll and Tanya Dapkey attend the DRWI Winter Gathering 
1/20/2020 Stef Kroll attends Lindy Center Community Based Learning workshop
January 2020 Stef Kroll and Tanya Dapkey attend DRWI Cluster Meetings
11/19/2019 Stef Kroll, Tanya Dapkey, Danielle Odom and Boloroo Erdenee attend the 3rd Annual Delaware Watershed Research Conference at the Academy of Natural Sciences
11/18/2019 Tanya Dapkey and the Philly Pod of 500 Women Scientists went to Harrisburg and met with local PA Representatives.  
Danielle Odom, Tanya Dapkey, Dr. Stef Kroll and Dr. Steven Burian at the Eagle Hill Institute
Heptageniidae Mayfly
Other important websites

Follow Dr. Stef Kroll's research: ResearchGate

Learn more about the Delaware River Watershed Initiative: ansp.org/drwi
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Watershed Ecology Section at the Academy of Natural Sciences:
​ www.ansp.org/research/environmental-research/sections/watershed/
Stef Kroll preparing to sample Cobbs Creek
Relevant papers
Kroll, S.A., Hayley C. Oakland, March 2019. A review of studies documenting the effects of agricultural best management practices on physiochemical and biological measures of stream ecosystem integrity. Natural Areas Journal.

Kroll, S.A., D.H. Keller, R.J. Horwitz, B.W. Sweeney, J.K. Jackson, L.B. Perez, February 2019. Monitoring large-scale conservation and restoration programs aimed at improving stream ecosystem integrity: The role of planning, goal setting, and data management.  Journal of Freshwater Science. ​

Kroll, S.A., N.H. Ringler, J. De las Heras. M.C. Cano, 2017. Macroinvertebrates on the front lines: projected community response to temperature and precipitation changes in Mediterranean streams. Journal of Freshwater Ecology 32(1), 513-528.

Hajek, A.E., P. Tobin, S.A. Kroll, S.J. Long, 2017.  Symbionts mediate oviposition behavior in invasive and native woodwasps. Agricultural and Forest Entomology doi: 10.1111/afe.12276.

Kroll, S.A., E.E. Morris, S.J. Long, A.E. Hajek, 2013. Parasitism of Sirex noctilio by non-sterilizing Deladenus siricidicola in northeastern North America. Biological Control 67: 203-211.

Kroll, S.A., N.H. Ringler, J. De las Heras, J.J. Gómez-Alday, A. Moratalla, R.D. Briggs, 2012. Changes in stream water quality and macroinvertebrate communities in response to flow regulation and inter-basin transfer: The Segura River Basin (SE Spain), Ecohydrology 6(5): 878-888.

Kroll, S.A., C. Navarro, M.C. Cano, J. De las Heras, 2009. The influence of land use on stream water quality and macroinvertebrate biotic indices in rivers within Castilla-La Mancha (Spain).  Limnetica 28(2): 203-214.

Kroll, S.A., R. Abell, 2015. Points of Departure: Baseline Conditions in the Subwatershed Clusters of the Delaware River Watershed Initiative, Academy of Natural Sciences of Drexel University, 65 pp. 

Kroll, S.A., L. Perez, 2014. Delaware River Watershed Initiative: Cluster Characterization Report, Academy of Natural Sciences of Drexel University, 34 pp. 

Kroll, S.A., L. Perez, K. Christopher, 2014. Coordinated Monitoring Plan for the Delaware River Watershed Initiative, Academy of Natural Sciences of Drexel University, 50pp. 

​Sweeney, Bern, et. al. including Dapkey, T. 2011. Can DNA barcodes of stream macroinvertebrates improve descriptions of community structure and water quality?  Journal of the North American Benthological Society. 30(1): 195-216. 
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