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RISS 인기검색어
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- 저자 : Niquil Nathalie (검색결과 1 건)
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Chkili Oumayma,Meddeb Marouan,Mejri Kousri Kaouther,Melliti Ben Garali Sondes,Makhlouf Belkhahia Nouha,Tedetti Marc,Pagano Marc,Belaaj Zouari Amel,Belhassen Malika,Niquil Nathalie,Sakka Hlaili Asma 한국해양과학기술원 2023 Ocean science journal Vol.58 No.1
We assessed the spatial variability in the size structure of phytoplankton, community composition, primary production and carbon fuxes through the planktonic food web of the Gulf of Gabès (GG; Southeastern Mediterranean Sea) in the fall of 2017 during the MERMEX-MERITE cruise. High concentrations in nutrients, chlorophyll a (~ 2–6 µg L−1) and primary production (1816–3674 mg C m−2 d−1) revealed an eutrophic status of the studied stations in the GG. In accordance with hydrodynamic features, inorganic nutrients showed increases in concentrations from North to South and from coast to ofshore, these nutrient gradients impacting the spatial distribution of phytoplankton community. Size-fractioned phytoplankton biomass and production were the lowest in the northernmost zone where they were mainly sustained by pico-sized fraction. Concomitantly, in this area, small aloricate ciliates were dominant leading to a high microbivory. Conversely, higher biomass and production were measured towards the South and ofshore with prevalence of larger phytoplankton (nano- and/or microsized fractions) supported by diatoms. The herbivorous protozooplankton and metazooplankton were more abundant in these zones, resulting in an increase of the herbivory. The vertical particulate organic carbon fux followed also a north–south and coast-ofshore increasing gradient, with a higher contribution of phytoplankton, and zooplankton fecal pellets to the sinking organic matter in the southernmost area. Our results suggest that even in nutrient-rich and highly productive waters, a continuum of trophic pathways, ranging from microbial to multivorous and herbivorous food webs, may exist, which implies diferent efciencies in carbon export and carrying capacity within the ecosystem.
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