2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/08/2017 | 10:00 AM - 10:15 AM | AQUATIC MACROINVERTEBRATE RESPONSES TO PREDATION AND TEMPERATURE: VARIATION IN CONTEXT DEPENDENT TROPHIC INTERACTIONS | 302C
AQUATIC MACROINVERTEBRATE RESPONSES TO PREDATION AND TEMPERATURE: VARIATION IN CONTEXT DEPENDENT TROPHIC INTERACTIONS
Trophic cascades, the indirect effects of carnivores on primary producers mediated by herbivores, remains a central theme of ecological theory. How climate change will alter the mechanisms controlling such interactions remains largely unexplored, certainly in stream ecosystems. In montane streams, stonefly predators have been documented to indirectly affect algal biomass by influencing the distribution, abundance, behavior, and life histories of invertebrate grazers. Density mediated interactions (DMI) occur when community composition is primarily influenced by changes in herbivore abundance due to consumption by predators. Trait-mediated interactions (TMI) alter available basal resources through non-consumptive interactions such as anti-predatory behaviors. In this research, we conducted mesocosm experiments on stonefly predators and mayfly prey to determine the relative importance of grazers on regulating algal production under 3 temperature treatments intended to simulate climate warming. Furthermore, we examined the influence of both TMI and DMI on algal production through consumptive and non-consumptive predatory treatments. We found algal production to decrease as temperature increased but no differences among grazer-alone treatments versus DMI or TMI on algal production.
- C03 Invertebrates
- C01 Algae
- C11 Community Ecology
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Presenters/Authors
Scott Morton
(), Colorado State Univeristy, smorton9292@gmail.com;
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