Seasonal dynamics of phytoplankton in the Gulf of Aqaba, Red Sea.

Al-Najjar, T., Badran, M.I., Richter, C., Meyerhöfer, Michael and Sommer, Ulrich (2006) Seasonal dynamics of phytoplankton in the Gulf of Aqaba, Red Sea. Hydrobiologia, 579 (1). pp. 69-83. DOI 10.1007/s10750-006-0365-z.

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Abstract

Seawater samples were collected biweekly from the northern Gulf of Aqaba, Red Sea, for Phytoplankton analysis during the period May 1998 to October 1999. Microscopic counts and HPLC methods were employed. Procaryotic and eucaryotic ultraplankton dominated throughout most of the year, with larger nano- and microplankton making up only 5% of the photosynthetic biomass. Moderate seasonal variations in the 0–125 m integrated Chl a contrasted with a pronounced seasonal succession of the major taxonomic groups, reflecting the changes in the density stratification of the water column: Prochlorococcus dominated during the stratified summer period and were almost absent in winter. Chlorophyceae and Cryptophyceae were dominant during winter mixing but scarce or absent during summer. Diatoms and Synechococcus showed sharp and moderate biomass peaks in late winter and spring respectively, but remained at only low Chl a levels for the rest of the year. Chrysophyceae, Prymnesiophyceae and the scarce Dinophyceae showed no clear seasonal distribution pattern. The implications of alternating procaryotic and eucaryote dominated algal communities for the Red Sea pelagic food web are discussed.

Document Type: Article
Keywords: Chlorophyll a, Pigments, Nutrients, HPLC, CHEMTAX Gulf, Aqaba, Red Sea
Research affiliation: OceanRep > GEOMAR > FB3 Marine Ecology > FB3-EOE-N Experimental Ecology - Food Webs
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BI Biological Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1007/s10750-006-0365-z
ISSN: 0018-8158
Projects: Future Ocean
Date Deposited: 03 Dec 2008 16:52
Last Modified: 02 Jul 2018 08:05
URI: http://oceanrep.geomar.de/id/eprint/8209

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