2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/25/2021 | 8:30 AM - 10:30 AM | ZOOPLANKTON SUBSIDY WITHIN A RESERVOIR-STREAM NETWORK DIFFERS BETWEEN WATER QUALITY REGIMES | Virtual Platform

ZOOPLANKTON SUBSIDY WITHIN A RESERVOIR-STREAM NETWORK DIFFERS BETWEEN WATER QUALITY REGIMES

Damming of streams creates a landscape mosaic of lentic systems (reservoirs) within a lotic system (the stream network) and alters ecological attributes of the stream network. The introduction of reservoirs into stream systems increases the planktonic subsidy to the lotic portions of the landscape and shifts community composition toward filter feeders in areas immediately downstream of the dams. Reservoir mixing dynamics result in regime-changes in water quality conditions that affect the plankton, so in this study we asked whether regime-changes in water quality influence zooplankton subsidy to streams. Our model system is a 4th order stream impounded by a series of four small polymictic reservoirs separated by an average of 3.41 stream-kilometers. UPGMA clustering of 22 water quality variables measured weekly supported the existence of three distinctly different water quality regimes: one defined by elevated conductivity readings, another by elevated colored dissolved organic matter (CDOM) readings, and a third with lower conductivity and CDOM readings. Zooplankton subsidy to the stream network was higher during the high-conductivity state, suggesting a link between zooplankton subsidy to the stream and reservoir mixing dynamics.

Stream
Nutrient cycling
Models

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Presenters/Authors

Sara Iuliucci (), Rowan University, iuliuc98@students.rowan.edu;