2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 2:15 PM - 2:30 PM | STREAM SIZE-DEPENDENT SPATIAL AND TEMPORAL PATTERNS IN DIATOM ASSEMBLAGES: EVIDENCE FROM A LONG-TERM STUDY IN MULTI-STRESSOR SYSTEMS | 302C
STREAM SIZE-DEPENDENT SPATIAL AND TEMPORAL PATTERNS IN DIATOM ASSEMBLAGES: EVIDENCE FROM A LONG-TERM STUDY IN MULTI-STRESSOR SYSTEMS
Bioassessment is commonly used to evaluate the integrity of rivers and streams, determine changes related to point source discharges, and inform management decisions. Although periphyton chlorophyll a is often incorporated into bioassessment programs, assessment of periphytic diatom assemblages is less common. Using a multi-year (n=13), multi-site (n=5-7/stream), seasonally sampled (spring and fall) dataset, we evaluated spatial and temporal patterns in diatom assemblages relative to non-point sources, and inputs from tributaries and pulp and paper mill discharges in four streams (Codorus Creek, PA; Leaf River, MS; McKenzie and Willamette Rivers, OR) of varying drainage area and land use. Diatom assemblage structure and biotic integrity/diagnostic metrics (e.g. %eutrophic, %sensitive, etc.) differed with stream size. In the larger rivers, significant differences in diatom assemblages occurred between seasons and across years, but spatial differences were rarely observed. In contrast, significant spatial and seasonal differences in diatoms were seen in wadeable Codorus Creek. Associated water quality and habitat measures support the hypothesis that stream size mediates spatial variability in these systems. Findings from this study highlight the value of spatially and temporally comprehensive datasets in elucidating assemblage patterns.
- C01 Algae
- C11 Community Ecology
- C17 Bioassessment
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Presenters/Authors
Camille Flinders
(), NCASI, cflinders@ncasi.org;
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William Arthurs
(), NCASI, warthurs@ncasi.org;
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Joan Ikoma
(), NCASI, jikoma@ncasi.org;
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Renee Ragsdale
(), NCASI, rragsdale@ncasi.org;
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