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Department of Estuarine and Ocean Sciences Seminar - Ilana Berman-Frank

When: Wednesday, October 20, 2021
12:30 PM - 1:30 PM
Where: > See description for location
Description: The School for Marine Science and Technology
Department of Estuarine and Ocean Sciences
Seminar Announcement

"Iron and Phosphorus Deprivation Induce Sociality in The marine Bloom-forming Cyanobacterium Trichodesmium"

Ilana Berman-Frank
Charney School of Marine Sciences
University of Haifa, Israel

Wednesday, October 20, 2021
12:30 pm to 1:30 pm
SMAST East Rooms 101/102
And Via Zoom

Trichodesmium spp. are dinitrogen-fixing (diazotrophic) cyanobacteria that exist as single filaments (trichomes) and as macroscopic colonies formed by aggregating trichomes. We demonstrate that limited availability of dissolved phosphorus (P) or iron (Fe) stimulated trichome mobility and induced colony formation in cultures and natural populations. The colonies formed appear to provide enhanced metabolic rates compared to single trichomes under depleted nutrients and were also characterized by stronger attachment forces between the trichomes. We postulate that also, in the nutrient-limited surface oceans, P and Fe availability prompt colony formation as well as bloom fate of Trichodesmium and primarily control the abundance and distribution of its different morphologies.
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Topical Areas: School for Marine Sciences and Technology, SMAST Seminar Series