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.
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.
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Recent activity
BIG NEWS!
We have been awarded the NFWF Grant for our proposal: "Evaluating Headwater Biodiversity, Vulnerability, and Potential Resilience to Inform Conservation in the Delaware Basin" !!! Sampling starts in Spring 2021, we can't wait to get started! MORE BIG NEWS! We have also been funded by PA Dept. Environmental Protection to study PA headwater macroinvertebrate diversity, which will complement the NFWF-funded work! 2/1/2021 Stef Kroll published this blog post, "Visualize Diverse Scientists" 12/2020 Stef wrote 2 blog posts on "River of the People" (Part 1, Part 2) about the Delaware Watershed of the Lenape historically and now. 8/31/2020 Kathryn Christopher and Tanya Dapkey wrote a blog for the River of the Year series called Data and the Delaware 8/8/2020 Tanya Dapkey produced and presented a Moth Night video to help ANS celebrate BugFest 2020 8/1/2020 Stef Kroll presented during the River Keeper Networks "Storytelling with Data" webinar 6/24/2020 Danielle Odom and Tanya Dapkey presented Macroinvertebrate Madness together for a virtual ANS event. 6/10/2020 Hayley Oakland presented her "Viewing variation in restored habitat" poster during the SFS Summer of Science in the Management and Conservation session 5/19/2020 Stef Kroll participated in the ANS Ask a Scientist where she answered questions all about fresh water ecology. 4/15/2020 Tanya Dapkey and Danielle Odom get together for some virtual outreach and chat about Freshwater Macros. 
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 Watershed Ecology Section at the Academy of Natural Sciences: www.ansp.org/research/environmental-research/sections/watershed/ Stef Kroll's Medium site for blog posts. 
Stef Kroll preparing to sample Cobbs Creek
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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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