2022 Early Hearing Detection & Intervention Virtual Conference
March 13 - 15, 2022
5/25/2021 | 2:00 PM - 3:30 PM | EVALUATING CONTROLS OF DIATOM BIODIVERSITY IN STREAMS IN THE MCMURDO DRY VALLEYS OF ANTARCTICA USING METACOMMUNITY SIMULATIONS AND REMOTE SENSING DATA | Virtual Platform
EVALUATING CONTROLS OF DIATOM BIODIVERSITY IN STREAMS IN THE MCMURDO DRY VALLEYS OF ANTARCTICA USING METACOMMUNITY SIMULATIONS AND REMOTE SENSING DATA
Because of the importance of diatoms as bioindicators, it is important that we develop a process-based understanding of the factors that organize their biodiversity at multiple spatial scales in heterogeneous and dynamic ecosystems. In the McMurdo Dry Valleys of Antarctica, well-described diatom assemblages are found within two cyanobacterial mat types, which occupy different habitats and vary in coverage within and among streams. Here, we use MCSim, a spatially explicit metacommunity simulation package for R, to test alternative hypotheses about the roles of dispersal and species sorting in maintaining the biodiversity of diatom assemblages. The spatial distribution and patchiness of cyanobacterial mat habitats was characterized by remote imagery of the Lake Fryxell sub-catchment in Taylor Valley. The available species pool for diatom metacommunity simulation scenarios was informed by the Antarctic Freshwater Diatoms Database, maintained by the McMurdo Dry Valleys Long Term Ecological Research program. We used simulation outcomes to test the plausibility of alternative community assembly hypotheses to explain empirically observed patterns of freshwater diatom biodiversity in the long-term record. The results point to the importance of dispersal for understanding current and future biodiversity patterns for diatoms in this ecosystem.
- Biodiversity
- Models
- Connectivity
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Presenters/Authors
Eric Sokol
(), Battelle, National Ecological Observatory Network (NEON), sokole@gmail.com;
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J. E. Barrett
(), Virginia Tech, jebarre@vt.edu;
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Tyler Kohler
(), École Polytechnique Fédérale de Lausanne, Switzerland, tyler.j.kohler@gmail.com;
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Lee Stanish
(), University of Colorado, Boulder, lstanasih@gmail.com;
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Diane McKnight
(), University of Colorado, diane.mcknight@colorado.edu;
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Mark Salvatore
(), Northern Arizona University, Mark.Salvatore@nau.edu;
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