2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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5/27/2021 | 2:00 PM - 3:30 PM | SEASONAL PATTERNS OF PHYTOPLANKTON PHOTOPHYSIOLOGY AND COMMUNITY COMPOSITION IN FLATHEAD LAKE, MONTANA | Virtual Platform

SEASONAL PATTERNS OF PHYTOPLANKTON PHOTOPHYSIOLOGY AND COMMUNITY COMPOSITION IN FLATHEAD LAKE, MONTANA

Phytoplankton often dominate primary production in large, deep lakes. In temperate lakes, phytoplankton community composition and physiology can vary widely over seasonal time scales. We used 2 years of near-monthly 16S rRNA gene sequences and phytoplankton photophysiology experiments, along with biogeochemical and physical data, to examine temporal dynamics in primary producers in oligotrophic Flathead Lake. Phytoplankton in the near-surface waters maintained elevated rates of carbon fixation per unit chlorophyll in the summer, when the lake was stratified and incident light flux was greatest, while phytoplankton growing in the low-light, deep chlorophyll maximum layer demonstrated less seasonal-scale variability. 16S rRNA gene sequence analyses revealed closely related members of the genus Cyanobium dominated cyanobacteria taxa, and eukaryotic phytoplankton (based on plastid rRNA genes) demonstrated clear seasonality. Relative abundances of Cryptophyceae were elevated during the well-mixed winter months, with Chrysophyceae becoming increasingly abundant during the summer. The phytoplankton composition, when compared across depths, indicates that summer lake stratification promotes vertically segregated phytoplankton communities. Together, our time series yield unique information on the seasonal phenology of the primary producer community in a large, oligotrophic lake.

Biogeochemistry
Ecological dynamics
Ecosystem Dynamics

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Presenters/Authors

Kate Evans (), Flathead Lake Biological Station, katherine1.evans@umontana.edu;