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Experimental Investigation of Secondary Flow Structures Downstream of a Model Type IV Stent Failure in a 180° Curved Artery Test Section

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Detection of scale-specific community dynamics using wavelets.

Timothy H Keitt¹, Janet Fischer

¹Section of Integrative Biology, University of Texas, Austin, Texas 78712, USA. tkeitt@mail.utexas.edu

|December 16, 2006

Summary

Ecological communities can respond to disturbances like acidification through synchrony or compensation. Wavelet analysis revealed that zooplankton communities exhibit both patterns, depending on the time scale and disturbance severity.

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Area of Science:

Ecology
Aquatic Ecology
Community Ecology

Background:

Ecological communities respond to anthropogenic disturbance.
Synchrony leads to large biomass fluctuations and ecosystem function changes.
Compensation maintains biomass and ecosystem function despite disturbances.

Purpose of the Study:

Examine zooplankton community dynamics under experimental pH manipulation.
Apply wavelet analysis to partition synchrony and compensation patterns by time scale.
Differentiate responses to seasonal variation versus acidification.

Main Methods:

Experimental pH manipulation in Little Rock Lake, Wisconsin.
Analysis of zooplankton community dynamics.
Novel application of wavelet analysis to time series data.
Partitioning synchrony and compensation by time scale.

Main Results:

Some time series exhibited both synchrony and compensation depending on the analysis scale.
Unmanipulated basin showed subtle synchrony and compensation at annual time scales.
Acidified basin dynamics shifted to longer time scales.
Differential sensitivity of Daphnia species to acidification revealed strong compensation at multiannual scales.

Conclusions:

Wavelet analysis effectively separates ecological patterns by time scale.
Zooplankton community responses vary with disturbance type and duration.
Understanding synchrony and compensation is crucial for predicting ecosystem stability under climate change.