Phytoplankton size changes and diversity loss in the southwestern Mediterranean Sea in relation to long-term hydrographic variability

Ramírez-Romero, Eduardo, Molinero, Juan Carlos, Sommer, Ulrich, Salhi, Noussaiba, Kéfi - Daly Yahia, Ons and Daly Yahia, Mohamed Néjib (2020) Phytoplankton size changes and diversity loss in the southwestern Mediterranean Sea in relation to long-term hydrographic variability Estuarine, Coastal and Shelf Science, 235 . Art.Nr. 106574. DOI 10.1016/j.ecss.2019.106574.

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Abstract

Structural changes in plankton primary producers have large implications for food web dynamics, energy fluxes and the vertical export of biogenic particulate carbon. Here we examine phytoplankton data spanning the period 1993–2008 from the Bay of Tunis, southwestern Mediterranean Sea, in relation to long term hydroclimate variability. We show a conspicuous shift in the structure of the phytoplankton community characterized by an increase of small-sized species and diversity loss, revealing a dominance of smaller blooming diatoms and cyanobacteria. Such changes were concurrent with marked modifications in hydroclimatic patterns experienced in the Bay of Tunis consisting of a shift towards enhanced winter precipitation together with rising temperatures. This novel study shows an overall rise in the proportion of small phytoplankton cells and a decreasing trend in phytoplankton diversity in the southern Mediterranean area. These findings warn of a potential decline of trophic efficiency and lesser food web stability resulting from mean size reduction and the diversity loss.

Document Type: Article
Keywords: Size structural changes; Diversity loss; Ocean warming; Nanophytoplankton; Phytoplankton diversity; Southwestern mediterranean
Research affiliation: IFREMER
OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-B Experimental Ecology - Benthic Ecology
Refereed: Yes
DOI etc.: 10.1016/j.ecss.2019.106574
ISSN: 0272-7714
Projects: OCEAN-CERTAIN
Date Deposited: 13 Jan 2020 10:05
Last Modified: 14 Jan 2020 09:03
URI: http://eprints.uni-kiel.de/id/eprint/48733

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