2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/08/2017 | 2:45 PM - 3:00 PM | GLACIAL-MELT OVERRIDES LONGITUDIANL PATTERNS IN BASAL RESOURCES AND FOOD WEBS OF APLINE STREAMS | 306B
GLACIAL-MELT OVERRIDES LONGITUDIANL PATTERNS IN BASAL RESOURCES AND FOOD WEBS OF APLINE STREAMS
Basal resources in stream ecosystems originate either from autochthonous (i.e., within-system) or allochthonous (i.e., external) production. Their quantity and relative proportion depend on location within the stream continuum as well as stream characteristics (e.g., water source from snow/glacial melt) and likely determine food web composition, structure, and production. We studied three catchments with differing degrees of glacial runoff and vegetation cover (alpine prairie to subalpine forest; up-to-downstream) for biofilm, benthic organic matter, and macroinvertebrates. Biofilm chlorophyll-a (chla) was highest in the snowmelt-fed stream and only showed an up-to-downstream increasing pattern in September during the chla-peak (6.13 to 34.19 mg/m2) while streams with glacial influence had generally low chla (<15 mg/m2). Coarse benthic organic matter (CBOM) was also higher in the snowmelt-dominated streams compared to the glacial-fed streams (mean 7 vs 3 g/m2). Macroinvertebrate densities were low in July and August in the glacial-melt influenced streams while the snowmelt dominated streams showed high densities of very small stoneflies. Results suggest that water source rather than upstream to downstream differences in basal resources drive patterns in food webs.
- S31 Moving forward in flow ecology: identifying and testing key hypotheses
- C03 Invertebrates
- C25 Food Webs
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Presenters/Authors
Janine Rüegg
(), University of Lausanne, janine.ruegg@unil.ch;
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Tom Battin
(), Ecole Polytechnique Fédérale de Lausanne, tom.battin@epfl.ch;
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