2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
6/08/2017 | 12:00 PM - 12:15 PM | RESILIENCE OF AQUATIC FOOD CHAINS TO PRESS AND PULSE PERTURBATIONS | 302B
RESILIENCE OF AQUATIC FOOD CHAINS TO PRESS AND PULSE PERTURBATIONS
Aquatic ecosystems are subject to myriad press and pulse perturbations including nutrient and sediment inputs, invasive species, floods, droughts, and increasing temperature. We sought to determine the attributes of ecosystems that confer resilience to perturbations, specifically the influence of interaction strength, fast and slow turnover pools, and ecosystem characteristics. We curated long-term data from lake and river ecosystems describing time series of nutrient concentrations, primary producers, consumers, and predators. We applied multivariate autoregressive state-space (MARSS) models to estimate metrics of resilience to perturbations, including reactivity of the ecosystem to perturbation and the return rate of the ecosystem following a perturbation. Since perturbations radiate through food chains in different ways, we explored the effect of top-down, bottom-up, and diffuse pathways of perturbation radiation through ecosystems. Our preliminary results indicate that riverine sediment inputs propagate through lake ecosystems following a variety of radiative models. Systems with high mean interaction strengths exhibited the greatest reactivity and return time. This meta-analysis of aquatic time series data contributes to our understanding of the factors shaping the resilience of aquatic ecosystems to disturbance.
- C20 Climate Change
- C11 Community Ecology
- S24 Towards a predictive freshwater ecology: using time-series data to understand and forecast responses to a changing environment
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Presenters/Authors
James Hood
(), The Ohio State University, hood.211@osu.edu;
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Thomas Barnum
(), USAID, tbarnum32@gmail.com;
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Irena Creed
(), School of Environment and Sustainability, University of Saskatchewan, Saskatoon, SK, irena.creed@usask.ca;
Irena Frances Creed is a Professor and Canada Research Chair in Watershed Sciences at Western University in Canada. Her research leadership and activity have improved our understanding of watershed hydrological and biogeochemical functions under present and predicted climate scenarios. By coupling this understanding with innovative techniques in geographic information systems, remote sensing and modeling to characterize these functions, she has enabled governments to develop planning and regulatory tools in support of innovative policies designed to ensure the sustainability of watershed systems.
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Shawn Devlin
(), Flathead Lake Biological Station- University of Montana, shawn.devlin@umontana.edu;
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Michelle Evans-White
(), University of Arkansas, mevanswh@uark.edu;
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Tamara Harms
(), University of Alaska Fairbanks, tamara.harms@alaska.edu;
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Jeremy Jones
(), Univeristy of Alaska Fairbanks, jbjonesjr@alaska.edu;
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Claire Ruffing
(), University of British Columbia, ruffing.cathcart@ubc.ca;
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Albert Ruhi
(), National Socio-Environmental Synthesis Center. , aruhi@sesync.org;
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Mark Scheuerell
(), University of Washington , scheuerl@uw.edu;
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Adrianne Smits
(), University of California, Davis, asmits@ucdavis.edu;
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Ashley Mickens
(), Miami University, mickenam@miamioh.edu ;
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