Diversity and distribution of winter phytoplankton in the Arabian Gulf and the Sea of Oman. (15th May 2016)

• Record Type: Journal Article
• Authors: Polikarpov, Igor; Saburova, Maria; Al-Yamani, Faiza
• Is Part Of: Continental shelf research. Volume 119(2016)
• Page Start: 85
• Page End: 99
• Publication Date: 2016-05-15
• Subjects: Arabian (Persian) Gulf -- Community structure -- Environmental gradients -- Phytoplankton -- Sea of Oman -- Taxonomic diversity; Continental shelf -- Periodicals; Submarine geology -- Periodicals; 551.41
• DOI: 10.1016/j.csr.2016.03.009
• Languages: English
• ISSNs: 0278-4343

Abstract

Abstract: The spatial distribution of the phytoplankton (diversity, composition, and cell abundance) was described in relation to local environmental conditions across the Arabian Gulf, the Strait of Hormuz, and the Sea of Oman based on data of ROPME cruise of winter 2006. The 376 phytoplankton taxa identified in these waters represented a diverse composition of species with a prevalence of dinoflagellates and diatoms. Three peaks in the phytoplankton abundance were recorded throughout the studied area associated with diatom-dominated phytoplankton blooms in the central and northwestern part of the Arabian Gulf and in the Sea of Oman and the adjacent waters. The studied area was divided into three main regions by cluster analysis based on differences in the phytoplankton composition and concentration. The Sea of Oman and the Strait of Hormuz were occupied by highly abundant, strongly diatom-dominated phytoplankton assemblage. The Arabian Gulf was divided into two main regions along a diagonal northwest-southeast axis, with rather diatom-dominated phytoplankton assemblage off the south and along the Iranian coast but with flagellate-dominated phytoplankton of the north and along the Arabian coast. The distance-based linear modeling revealed a significant relationship between the phytoplankton composition and water masses as indexed by salinity. Our results demonstrated that abundance and composition of winter phytoplankton were related to water circulation pattern in the Arabian Gulf and the Sea of Oman. Highlights: We studied phytoplankton composition and distribution in Arabian Gulf and Sea of Oman. 376 taxa dominated by dinoflagellates followed by diatoms were identified. Diatoms prevailed numerically alternating with peaks of dinoflagellates/cryptophytes. 3 distinct phytoplankton assemblages related to different water masses were defined. Patterns of regional phytoplankton composition followed salinity gradient.