2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
5/22/2018 | 11:00 AM - 11:15 AM | TRIBUTARY JUNCTION, WHAT’S YOUR FUNCTION? TESTING HYPOTHESES REGARDING THREE MECHANISTIC RESPONSES IN BENTHIC COMMUNITY STRUCTURE AT TRIBUTARY JUNCTIONS | 420 A
TRIBUTARY JUNCTION, WHAT’S YOUR FUNCTION? TESTING HYPOTHESES REGARDING THREE MECHANISTIC RESPONSES IN BENTHIC COMMUNITY STRUCTURE AT TRIBUTARY JUNCTIONS
Stream network connectivity is an important watershed-scale characteristic as it can influence local habitat and resources available for stream biota. Previous studies found that tributary confluences are ecologically significant locations, causing punctuations in the longitudinal organization of benthic invertebrate communities. However, there has been little effort to test mechanisms underlying these macroinvertebrate community responses, such as modified habitat structure, inputs of novel resources, and colonization from drifting invertebrates. These mechanisms were tested using colonization baskets to manipulate substrate size, organic matter, and position relative to tributary junction. Combining these data with drift sampling, we tested the following hypotheses: (1) Coarser substrate and added leaf litter upstream will partly explain the community dissimilarity upstream and downstream. (2) Drifting invertebrates from the tributary also largely contribute to upstream-downstream contrasts.
(3) The largest contrasts of drift and benthic community composition occur in mid-sized tributaries, where they are sufficiently large to provide signal, yet small enough to be ecologically distinct from the mainstem channel. The extent to which these mechanisms explain changes in observed communities can provide insight into which characteristics of tributary contributions are important for maintaining stream network benthic biodiversity.
- Connectivity
- Invertebrate
- Biodiversity
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Presenters/Authors
David Tavernini
(), University of British Columbia, taverninid@gmail.com;
ASHA DISCLOSURE:
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John Richardson
(), University of British Columbia, John.Richardson@ubc.ca;
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Nonfinancial -