Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/133253
Title: Planktonic habitats in the Amazon Plume region of the Western Tropical North Atlantic
Authors: Pham, Anh H.
Choisnard, Noémie
Fernández Carrera, Ana 
Subramaniam, Ajit
Strope, Erica K.
Carpenter, Edward J.
Voss, Maren
Montoya, Joseph P.
UNESCO Clasification: 251001 Oceanografía biológica
Keywords: Amazon River plume
Habitat classification
Hierachical clustering
Phytoplankton
Western Tropical North Atlantic
Issue Date: 2024
Journal: Frontiers in Marine Science 
Abstract: The Western Tropical North Atlantic is a highly dynamic marine system where the Amazon River Plume (ARP) generates a patchwork of environmental conditions that favor different phytoplankton groups. To study phytoplanktonic community structure in such heterogeneous conditions, we used a set of five standard ship-based measurements taken from oceanographic surveys between 2010 and 2021 to characterize different habitat types. We then utilized a variety of multiparametric approaches to examine phytoplankton biodiversity in the different habitats to assess the biological relevance of our delineated habitats. Our approach generated a consistent set of habitat types across cruises carried out in multiple different years and the Amazon’s two predominant (wet and dry) seasons. Our phytoplankton community analyses revealed strong distinctions among all habitats along the plume gradient using in-vivo fluorescence and diagnostic pigments, and clear contrasts of diazotroph community along the mesohaline waters using direct cell-count, a pattern consistent with niche partitioning among similar species. The few apparent mismatches we found between phytoplankton community composition and habitat may reflect recent hydrographic changes driven by mixing and/or upwelling and thus may be a useful index to biologically-relevant temporal variation. Our habitat classification approach is straightforward and broadly applicable in identifying biologically distinct areas within heterogeneous and dynamic regions of the ocean.
URI: http://hdl.handle.net/10553/133253
ISSN: 2296-7745
DOI: 10.3389/fmars.2024.1287497
Source: Frontiers in Marine Science [ISSN 2296-7745], v. 11
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