Spatio-temporal variability of the size-fractionated primary production and chlorophyll in the Levantine Basin (northeastern Mediterranean)
Summary: 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 off...
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| Format: | Article |
| Language: | English |
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Elsevier
2018-07-01
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| Series: | Oceanologia |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0078323418300022 |
| _version_ | 1819211108859248640 |
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| author | Nebil Yucel |
| author_facet | Nebil Yucel |
| author_sort | Nebil Yucel |
| collection | DOAJ |
| description | Summary: 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. Keywords: Primary production, Chlorophyll, Picoplankton, Rhodes Gyre, Cilician Basin, Levantine Basin |
| first_indexed | 2024-12-23T06:21:50Z |
| format | Article |
| id | doaj.art-f0759b5b3b2243e88bed4b6105783531 |
| institution | Directory Open Access Journal |
| issn | 0078-3234 |
| language | English |
| last_indexed | 2024-12-23T06:21:50Z |
| publishDate | 2018-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Oceanologia |
| spelling | doaj.art-f0759b5b3b2243e88bed4b61057835312022-12-21T17:57:10ZengElsevierOceanologia0078-32342018-07-01603288304Spatio-temporal variability of the size-fractionated primary production and chlorophyll in the Levantine Basin (northeastern Mediterranean)Nebil Yucel0Faculty of Marine Sciences & Technology, Iskenderun Technical University, Hatay, Turkey; Institute of Marine Sciences, Middle East Technical University. Erdemli, Mersin, Turkey; Correspondence to: Iskenderun Technical University, Faculty of Marine Sciences & Technology, Department of Water Resources Management and Organization, Meydan Mah. 512 Sk, 31320 Iskenderun, Hatay, Turkey. Tel.: +90 326 614 1693x3720; fax: +90 326 614 1877.Summary: 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. Keywords: Primary production, Chlorophyll, Picoplankton, Rhodes Gyre, Cilician Basin, Levantine Basinhttp://www.sciencedirect.com/science/article/pii/S0078323418300022 |
| spellingShingle | Nebil Yucel Spatio-temporal variability of the size-fractionated primary production and chlorophyll in the Levantine Basin (northeastern Mediterranean) Oceanologia |
| title | Spatio-temporal variability of the size-fractionated primary production and chlorophyll in the Levantine Basin (northeastern Mediterranean) |
| title_full | Spatio-temporal variability of the size-fractionated primary production and chlorophyll in the Levantine Basin (northeastern Mediterranean) |
| title_fullStr | Spatio-temporal variability of the size-fractionated primary production and chlorophyll in the Levantine Basin (northeastern Mediterranean) |
| title_full_unstemmed | Spatio-temporal variability of the size-fractionated primary production and chlorophyll in the Levantine Basin (northeastern Mediterranean) |
| title_short | Spatio-temporal variability of the size-fractionated primary production and chlorophyll in the Levantine Basin (northeastern Mediterranean) |
| title_sort | spatio temporal variability of the size fractionated primary production and chlorophyll in the levantine basin northeastern mediterranean |
| url | http://www.sciencedirect.com/science/article/pii/S0078323418300022 |
| work_keys_str_mv | AT nebilyucel spatiotemporalvariabilityofthesizefractionatedprimaryproductionandchlorophyllinthelevantinebasinnortheasternmediterranean |