2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/25/2021 | 2:00 PM - 3:30 PM | THE POSSIBILITY OF FRESHWATER ESTUARIES AS HOTSPOTS IN LITTORAL BENTHIC COMMUNITIES | Virtual Platform
THE POSSIBILITY OF FRESHWATER ESTUARIES AS HOTSPOTS IN LITTORAL BENTHIC COMMUNITIES
Freshwater ecosystems are often linked, such as streams flowing into lakes or wetlands, but lotic-lentic transitions are rarely studied. The ecotone between tributary stream and lake may function as a freshwater estuary. We hypothesized that the littoral influenced by the tributary will be a hotspot (e.g., higher macroinvertebrate diversity/biomass, higher metabolism). We measured macroinvertebrate diversity and biomass and benthic metabolism of nine littoral locations along the 50 cm depth line parallel to shore in each of the two inlets of Lake Derborence (Switzerland). Sample locations spanned littoral from beyond to through and, again, beyond the influence of the inflowing stream water, with sampling occurring monthly from July through October. Macroinvertebrate communities differed between stream and lake and varied greatly in abundance and diversity among inlets and months. Metabolic rates were similar among the two inlets but highest in September when temperatures were highest. In general, variation in macroinvertebrates and metabolism was high at small scales (within an inlet and month), but differences were not explained by proximity to the mixing zone. Transition zones of Lake Derborence did not reveal expected biological hotspots but rather a highly heterogeneous lake littoral.
- Ecotones
- Biodiversity
- Ecosystem functioning
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Presenters/Authors
Janine Rüegg
(), University of Lausanne, janine.ruegg@unil.ch;
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Marie-Elodie Perga
(), University of Lausanne, marie-elodie.perga@unil.ch;
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Stuart Lane
(), University of Lausanne, stuart.lane@unil.ch;
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