EARLY HEARING DETECTION AND INTERVENTION VIRTUAL CONFERENCE
MARCH 2-5, 2021
(Virtually the same conference, without elevators, airplane tickets, or hotel room keys)
5/23/2018 | 9:15 AM - 9:30 AM | A STOCHASTIC MODEL OF EPILITHIC ALGAL SUCCESSION AND PATCH DYNAMICS IN STREAMS | 330 B
A STOCHASTIC MODEL OF EPILITHIC ALGAL SUCCESSION AND PATCH DYNAMICS IN STREAMS
Spatiotemporal distribution of epilithic periphyton succession is described using a stochastic model based on continuous-time, Markovian processes. Periphyton within a reach is viewed as a mosaic of habitat patches undergoing different successional trajectories. Spatiotemporal, allogenic-conditions that define patches constrain autogenic factors within them. Each patch can contain 1 of 8 community types defined by algal growth forms. Ninety-two successional data sets were used to determine transition probabilities among communities as a function of light, nutrients and current. In the absence of disturbance and grazing, succession within a patch reaches a stationary, “climax”, state. Preliminary simulations indicate high light and nutrients increase transition probabilities toward communities containing a mat of motile diatoms with emergent filamentous Chlorophytes. Low light and nutrients result in communities with prostrate taxa and/or erect, araphid diatoms. Current has less of an effect on transitions. Data from the literature will be used to determine the probability and degree to which succession within patch is reset by disturbance or grazing. The dynamic distribution of patch types then can be described based on the frequency and severity of these resetting events.
- Periphyton
- Diatom
- Distribution
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Presenters/Authors
Dean DeNicola
(), Slippery Rock University, dean.denicola@sru.edu;
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James McNair
(), Grand Valley State Univ. Annis Water Resources Institute, mcnairja@gvsu.edu;
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Jiyeon Suh
(), Grand Valley State University, suhj@gvsu.edu;
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