Planktonic food web structure and trophic transfer efficiency along a productivity gradient in the tropical and subtropical Atlantic Ocean
| Autor: | Albert Calbet, Gara Franchy, Santiago Hernández-León, Adriana Rodríguez-Santos, Laia Armengol |
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| Přispěvatelé: | Ministerio de Economía y Competitividad (España), European Commission |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0301 basic medicine
Chlorophyll Food Chain lcsh:Medicine Article 03 medical and health sciences 0302 clinical medicine Phytoplankton Seawater Biomass Ciliophora lcsh:Science Diel vertical migration Atlantic Ocean Trophic level Prochlorococcus Synechococcus Biomass (ecology) Autotrophic Processes Multidisciplinary biology lcsh:R Plankton biology.organism_classification Food web 030104 developmental biology Oceanography Dinoflagellida Environmental science Upwelling lcsh:Q 030217 neurology & neurosurgery |
| Zdroj: | Scientific Reports, Vol 9, Iss 1, Pp 1-19 (2019) Scientific Reports Digital.CSIC. Repositorio Institucional del CSIC instname |
| ISSN: | 2045-2322 |
| Popis: | 19 pages, 11 figures, 5 tables, supplementary information https://doi.org/10.1038/s41598-019-38507-9 Oligotrophic and productive areas of the ocean differ in plankton community composition and biomass transfer efficiency. Here, we describe the plankton community along a latitudinal transect in the tropical and subtropical Atlantic Ocean. Prochlorococcus dominated the autotrophic community at the surface and mixed layer of oligotrophic stations, replaced by phototrophic picoeukaryotes and Synechococcus in productive waters. Depth-integrated biomass of microzooplankton was higher than mesozooplankton at oligotrophic stations, showing similar biomasses in productive waters. Dinoflagellates dominated in oligotrophic waters but ciliates dominated upwelling regions. In oligotrophic areas, microzooplankton consumed ca. 80% of the production, but ca. 66% in upwelling zones. Differences in microzooplankton and phytoplankton communities explain microzooplankton diel feeding rhythms: higher grazing rates during daylight in oligotrophic areas and diffuse grazing patterns in productive waters. Oligotrophic areas were more efficient at recycling and using nutrients through phytoplankton, while the energy transfer efficiency from nutrients to mesozooplankton appeared more efficient in productive waters. Our results support the classic paradigm of a shorter food web, and more efficient energy transfer towards upper food web levels in productive regions, but a microbially dominated, and very efficient, food web in oligotrophic regions. Remarkably, both models of food web exist under very high microzooplankton herbivory This research was funded by projects Migrants and Active Flux in the Atlantic Ocean (MAFIA, CTM2012-39587-C04-01) to S.H.L. and Daily feeding rhythms in marine microzooplankton (FERMI, CGL2014-59227-R; MINECO/FEDER, UE) to A.C. L.A. was funded with a doctoral fellowship (BES-2013-063148) from the MINECO of Spain |
| Databáze: | OpenAIRE |
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