2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/05/2017 | 9:00 AM - 9:15 AM | FLOW AND LARGE CONSUMER ALTERATIONS CAN HAVE LIMITED IMPACTS ON BENTHIC COLONIZATION IN PRODUCTIVE AGRICULTURAL STREAMS | 302C
FLOW AND LARGE CONSUMER ALTERATIONS CAN HAVE LIMITED IMPACTS ON BENTHIC COLONIZATION IN PRODUCTIVE AGRICULTURAL STREAMS
Increased water demand and more variable rainfall are expected to change stream flow regimes in the southeastern U.S. Predicted increases in floods and drying will increase benthic recolonization events, and concurrently change community interactions during recolonization as large consumers return from more distant refugia. We studied how stream benthos recover under altered flow and large consumer presence. We split a second order stream in half with 10 m long plastic barriers that diverted water to create high and low discharge sides at three sites. Consumer exclusion cages were nested within flow treatments. Neither a 2-fold difference in discharge and velocity, nor large consumers had a significant effect on algal or macroinvertebrate colonization during the five-week study. Although lower discharge increased overall benthic organic matter by 68%, benthic respiration and gross primary productivity were not significantly changed. This agricultural stream was highly productive with algal biomass exceeding 300 mg chl a m-2. It appears bottom-up resource control may dominate physical and biological controls, suggesting impacted streams may be more resistant to changes in flow regimes when algal and macroinvertebrate source colonists are present.
- C22 Disturbance
- C11 Community Ecology
- S31 Moving forward in flow ecology: identifying and testing key hypotheses
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Presenters/Authors
Justin Murdock
(), Tennessee Tech University, jnmurdock@tntech.edu;
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Andrea Engle
(), Tennessee Tech University, anengle42@students.tntech.edu;
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Natalie Knorp
(), Tennessee Tech University, neknorp42@students.tntech.edu;
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Amy Doll
(), Tennessee Tech University, aedoll42@students.tntech.edu;
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Eric Malone
(), Tennessee Tech University, ewmalone42@students.tntech.edu;
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Grace McClellan
(), Tennessee Tech University, gmcclellan@tntech.edu;
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Melissa Moffet
(), Tennessee Tech University, mcmoffet42@outlook.com;
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Juliet Ohemeng-Ntiamoah
(), Tennessee Tech University, johemengn42@students.tntech.edu;
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Jason Payne
(), Tennessee Tech University, jhpayne42@students.tntech.edu;
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Robert Paine
(), Tennessee Tech University, rtpaine42@students.tntech.edu;
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Juju Wellemeyer
(), Tennessee Tech University, cwellemey42@students.tntech.edu;
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