2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

5/20/2019 | 3:00 PM - 3:15 PM | EFFECTS OF TEMPERATURE ON ENERGY FLUX THROUGH STREAM FOOD WEBS | 250 DE

EFFECTS OF TEMPERATURE ON ENERGY FLUX THROUGH STREAM FOOD WEBS

Predicting how temperature influences fluxes of energy through food webs is challenging because of covariation between temperature and resource (e.g., light, food) availability. Further, responses of food web fluxes to warming will depend on both physiological changes to consumer metabolism, as well as, population-level shifts in species composition and life-history. We measured the influence of temperature on energy and material fluxes from basal resources to invertebrate consumers seasonally in six geothermally-influenced streams (temperature range: ~5–30°C). We predicted temperature-invariance of energy flows because of the opposing expectations for temperature dependence of standing biomass and energy demand. We found that total annual energy fluxes were positively related to temperature. However, seasonal patterns in light led to widely varying consumer biomass, strongly influencing the timing (late-summer peak) and magnitude (~15–70 fold differences) of consumer demand. In the warmest stream, peak consumer demand was out of phase with resource availability due to large reductions in demand as temperatures neared the thermal maximum for metazoans. Our results show that interactions between temperature and resource availability shape temporal patterns of energy flux in food webs and may constrain stream ecosystem responses to warming.

Invertebrate
Predator-prey
Organic Matter

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Presenters/Authors

James Junker (), Montana State University, james.junker1@gmail.com;