2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/05/2017 | 9:30 AM - 9:45 AM | A FISH EYE VIEW OF ‘BROWNING’: DIRECT VS INDIRECT EFFECTS OF ORGANIC MATTER LOADING ON FISH-ZOOPLANKTON INTERACTIONS | 306C
A FISH EYE VIEW OF ‘BROWNING’: DIRECT VS INDIRECT EFFECTS OF ORGANIC MATTER LOADING ON FISH-ZOOPLANKTON INTERACTIONS
Mechanisms driving the ‘browning’ of fresh waters are currently under intense investigation. However, less is known about the direct and indirect effects browning will have on the structure and function of aquatic communities. We investigated the effect of browning on larval Micropterus salmoides and their zooplankton prey. Experimental tanks were established in the laboratory where water color was altered with increasing concentrations of Super Hume (absorbance at 440 nm = 1.4 – 9.6 m<-1>). Direct effects on foraging efficiency and selectivity were assessed with short-term feeding experiments. Indirect effects were assessed over the course of one month, observing changes in the growth and abundance of algae and zooplankton and subsequent effects on fish feeding rate and growth. Browning did not directly alter the ability of larval fish to see and capture prey across our brown water treatments. However, we did observe significant indirect effects on fish due to decreases in algae and zooplankton with increased water color. Thus, browning is likely to reduce energy transfer to larval fish during a critical stage of development due to a reduction in prey availability rather than a reduction in visual acuity.
- C25 Food Webs
- C11 Community Ecology
- S10 Understanding and predicting the effects of climate change on lake and stream fishes x S15 Connectivity and Effects of Carolina and Delmarva Bays, Pocosins, and other Geographically Isolated Wetlands of the Atlantic Coastal Plain
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Presenters/Authors
Jacob Spain
(), Longwood University, jacob.spain@live.longwood.edu;
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Troy Clift
(), Longwood University, troy.clift@live.longwood.edu;
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Dina Leech
(), Longwood University, leechdm@longwood.edu;
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