2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/25/2021 | 8:30 AM - 10:30 AM | Transient dynamics over ecological timescales: take it to the limit or one piece at a time? | Virtual Platform
Transient dynamics over ecological timescales: take it to the limit or one piece at a time?
River communities of plants, invertebrates, and fish are in a constant state of flux, with local extinctions and range expansions occurring over ecological timescales. These non-equilibrium dynamics are driven by the rivers themselves, which impose flow and disturbance regimes that fluctuate on daily, annual, or longer timescales. While population models (matrix models, logistic growth projections, Lotka-Volterra equations) can describe population trajectories and species interactions in these dynamic ecosystems, model analysis often involves asymptotic analysis, or taking the limit of population dynamics over long timescales -- a method that may not be appropriate for river communities that aren’t in equilibrium. An alternative approach is to measure the transient dynamics of populations over piecewise timeframes of interest. While asymptotic analysis sometimes predicts eventual extirpation of less-competitive species, and thus community simplification, transient analysis shows that these species can co-occur over meaningful timescales (10’s to 100’s of generations or longer). The concepts are illustrated with empirical examples that explore plant, invertebrate, and fish populations that inhabit desert rivers prone to flood and drought events as well as non-stationary shifts in flow regime due to climate change.
- Ecological dynamics
- Flow regime
- Biodiversity
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Presenters/Authors
Dave Lytle
(), Oregon State University, lytleda@oregonstate.edu;
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