Spatio-temporal variability of the size-fractionated primary production and chlorophyll in the Levantine Basin (northeastern Mediterranean)

• Autorzy: Yucel N.

Identyfikatory

DOI

10.1016/j.oceano.2017.12.003

• Języki publikacji: EN

Abstrakty

EN

Spatial and temporal variations in size-fractionated primary production (PP) and chl a, in relation to ambient physicochemical parameters, were studied in the three distinct ecosystems of northeastern Levantine Basin namely eutrophic Mersin Bay, mesotrophic Rhodes Gyre, and oligotrophic offshore waters. These ecosystems were visited in July and September 2012 and March and May 2013. Total primary production (TPP) rates ranged between 0.22 and 17.8 mg C m⁻³ h⁻¹ within the euphotic zone, whereas depth-integrated TPP rates were in the range 21.5-348.8 mg C m⁻² h⁻¹ (mean: 105.5 ± 88 mg C m⁻² h⁻¹), with the lowest rates recorded for offshore waters. Similar spatio-temporal variations were observed in chl a concentrations, ranging from 2.3 to 117.9 mg m⁻² (mean: 28.9 ± 24.9 mg m⁻²) in the study area. The Mersin Bay TPP rates have exceeded almost 8-12 times those measured in the offshore waters and the Rhodes Gyre; however, the chl a concentrations measured in coastal waters (0.343 mg m⁻³) and the Rhodes Gyre (0.308 mg m⁻³) were only threefold larger than the offshore values. PP and chl a were dominated by picoplankton in the study area whereas small nanoplankton, being the most active, displayed the highest assimilation ratio in offshore waters (6.8) and the Rhodes Gyre (2.8). In the upper-layer waters depleted of P (0.02-0.03 μM) of the northeastern Mediterranean, a positive correlation was observed between NO₃ + NO₂ and PP (and thus, chl a), which strongly suggests that reactive P and inorganic nitrogen are co-limiting factors in the production and biomass distribution of the phytoplankton community in both shelf and offshore waters.

Słowa kluczowe

EN

primary production; chlorophyll; picoplankton; Rhodes Gyre; Cilician Basin; Levantine Basin

• Wydawca: Polish Academy of Sciences, Institute of Oceanology ; Elsevier
• Czasopismo: Oceanologia
• Rocznik: 2018
• Tom: No. 60 (3)
• Strony: 288--304
• Opis fizyczny: Bibliogr. 56 poz., mapy, rys., tab., wykr.

Twórcy

autor

Yucel N.

• Faculty of Marine Sciences & Technology, Iskenderun Technical University, Hatay, Turkey
• Institute of Marine Sciences, Middle East Technical University, Erdemli, Mersin, Turkey

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2018).