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The characterisation and summer distribution of ultraphytoplankton in the Gulf of Gabes (Eastern Mediterranean Sea, Tunisia) by using flow cytometry
- Source :
- Continental Shelf Research, Continental Shelf Research, Elsevier, 2015, 93, pp.27-38. ⟨10.1016/j.csr.2014.10.002⟩, Continental Shelf Research, 2015, 93, pp.27-38. ⟨10.1016/j.csr.2014.10.002⟩
- Publication Year :
- 2015
- Publisher :
- HAL CCSD, 2015.
-
Abstract
- TheGulfofGabesintheEasternMediterraneanBasinisoneofthelargestcontinentalshelvesandisahighly productivearea.ThisisincontrasttotheEasternMediterraneanBasinasawholewhichisoligotrophicto ultraoligotrophic.Overrecentyears,duetoincreasedpressurefromanthropologicalactivities,therehas beenadeclineinthebiologicalresourcesintheGulfofGabes.Thishasledscientiststofocustheirresearch on thedifferenttrophiclevelsofthefoodchainandinparticularonphytoplankton.Studiesdedicatedto phytoplanktonintheGulfofGabeshavepreviouslyreliedonconventionalglobalapproaches.Thisworkon theotherhand,examinesultraphytoplankton(o10 mm) distributionatthesinglecelllevelindifferent watermasses,duringasummercruise(2008).Threedistinctwatermasseswereidentified:modified Mediterraneanwaters(MMW),modified Atlanticwaters(MAW)andIonianwaters(IW).Despitethe summerperiod,nutrientswereabundantandnon-limiting.Flowcytometryresolved five cellgroups, Prochlorococcus, Synechococcus, picoeukaryotes,nanoeukaryotesandagroupofunidentified cells.These cellswerecharacterisedbylow fluorescencesignalsandscattersignalslargerthanthatofcyanobacteriaand picoeukaryotesandthuswerelabelledLFNanoforlow fluorescencenanoeukaryotes.Theywerefoundin veryhighabundances,whereastheotherusualgroupswererelativelylowinabundancedespitethe favourablegrowthconditions.LFNanofoundduringa2012summercruiseinthesamearea,werealso sorted by flowcytometryandobservedbyscanningelectronmicroscopy.Choanoflagellateswereidentified, andthesenanoflagellatesappeartoaccountforthelowabundanceintheusualultraphytoplanktongroup due totheirefficientfeeding/grazingmechanism.However,themostabundantLFNanocouldnotbe identified.Resultsstronglysuggestatop-downcontroloftheecosystem,consistentwiththehigh productivityoftheGulfthatimpliesarapidtransferofmatterandenergytohighertrophiclevels.
- Subjects :
- [SDU.OCEAN]Sciences of the Universe [physics]/Ocean, Atmosphere
biology
business.industry
Distribution (economics)
Geology
Aquatic Science
Oceanography
Synechococcus
biology.organism_classification
Choanoflagellates
Eastern mediterranean
Mediterranean sea
Climatology
Phytoplankton
Mediterranean Sea
Environmental science
14. Life underwater
Prochlorococcus
Flow cytometry
business
Top-down control
Gulf of Gabes
Subjects
Details
- Language :
- English
- ISSN :
- 02784343 and 18736955
- Database :
- OpenAIRE
- Journal :
- Continental Shelf Research, Continental Shelf Research, Elsevier, 2015, 93, pp.27-38. ⟨10.1016/j.csr.2014.10.002⟩, Continental Shelf Research, 2015, 93, pp.27-38. ⟨10.1016/j.csr.2014.10.002⟩
- Accession number :
- edsair.doi.dedup.....c10e6fc9363e7e817c56c24e1178515c
- Full Text :
- https://doi.org/10.1016/j.csr.2014.10.002⟩