Spring bloom of the raphidophycean Heterosigma akashiwo in the Golden Horn Estuary at the northeast of Sea of Marmara

Dursun, Fuat; Taş, Seyfettin; Koray, Tufan

doi:10.12714/egejfas.2016.33.3.03

Cited by 10 publications

(11 citation statements)

References 19 publications

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“…During this study, the bloom of H. akashiwo occurred in the UE almost at the same time as that of the previous study. Results indicated that a rapid temperature rise in spring was the most important factor that caused a bloom of H. akashiwo , as reported by Dursun et al (2016). Nevertheless, high abundances were detected for diatoms Skeletonema marinoi and Thalassiosira sp., and the cryptophycean Plagioselmis prolonga , which are known to be bloom-forming species for the GHE (Tas et al , 2009; Tas & Yilmaz, 2015).…”

Section: Discussionsupporting

confidence: 80%

“…Algal blooms in the GHE have been discussed in detail by several studies (Tas et al , 2006, 2009; Tas & Okuş, 2011; Tas, 2015; Tas & Yilmaz, 2015; Dursun et al , 2016; Tas & Lundholm, 2016). Dense algal blooms, except for the raphidophycean Heterosigma akashiwo , were not recorded in the GHE during the study period.…”

Section: Discussionmentioning

confidence: 97%

“…Following rehabilitation, the changes in the ecosystem such as increasing water circulation, dissolved oxygen concentration and water transparency stimulated the growth and species richness of phytoplankton assemblages (Tas et al , 2009). In recent years, many studies have focused on algal blooms and potentially harmful microalgae (Tas, 2015, 2017; Tas & Yilmaz, 2015; Dursun et al , 2016; Tas & Lundholm, 2016), toxic diatom species and their toxins (Tas et al , 2016; Dursun et al , 2017), and planktonic diatom composition in the GHE (Tas, 2017).…”

Section: Introductionmentioning

confidence: 99%

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Variations in abundance and diversity of phytoplankton in the surface waters of the Golden Horn Estuary (Sea of Marmara)

Dursun

Taş

2018

J. Mar. Biol. Ass.

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The abundance pattern and species diversity of phytoplankton in the surface waters of the Golden Horn Estuary were investigated between August 2011 and July 2012 in relation to environmental factors. Seventy-eight phytoplankton taxa (38 diatoms, 30 dinoflagellates and 10 phytoflagellates) belonging to eight taxonomic classes were identified in bottle and net samples. Phytoplankton abundance increased in spring and summer (from March to August) and reached its highest (10,429 × 103 cells L−1) during the bloom of Heterosigma akashiwo (Raphidophyceae) in the middle and upper estuary in late May. In general, phytoplankton abundance was higher in the middle estuary indicating more suitable conditions for phytoplankton growth, while species richness and diversity was higher in the lower estuary. The most abundant species were Skeletonema marinoi and Thalassiosira sp. among diatoms; Scrippsiella trochoidea among dinoflagellates; Plagioselmis prolonga and Heterosigma akashiwo among phytoflagellates. Diatoms were more abundant in the lower and middle estuary, while dinoflagellates and phytoflagellates in the upper estuary. The main factors causing the spatio-temporal variation of phytoplankton in the study area were temperature, salinity, water transparency and nutrients. Water transparency in the upper estuary is mostly influenced by organic and inorganic matter carried by two streams. As a result, this area should be considered a potential risk area for future algal blooms.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Variations in abundance and diversity of phytoplankton in the surface waters of the Golden Horn Estuary (Sea of Marmara)

Dursun

Taş

2018

J. Mar. Biol. Ass.

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“…Harmful algal blooms (HABs) have usually been reported from the coasts of the northeastern Sea of Marmara and the Dardanelles. During the last decade, the diatom Pseudo-nitzschia calliantha, the dinoflagellates; Heterocapsa triquetra, Noctiluca scintillans, Prorocentrum micans, Prorocentrum cordatum and Scrippsiella acuminata (reported as Scrippsiella trochoidea) and the raphidophyte Heterosigma akashiwo have been reported as bloom-forming species (Turkoglu, 2008 andTas et al, 2009;Tas, 2015;Tas & Yilmaz, 2015;Dursun et al, 2016;Tas et al, 2016;Tas & Lundholm, 2017). In this study, we considered only the known potentially toxic species.…”

Section: Discussionmentioning

confidence: 99%

Temporal variations in phytoplankton composition in the northeastern Sea of Marmara: potentially toxic species and mucilage event

Taş

Kus

Yılmaz³

2020

Medit. Mar. Sci.

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Temporal variations in phytoplankton composition in the northeastern Sea of Marmara was investigated associated with physico-chemical variables from January 2004 to December 2007. The occurrence of potentially toxic species and a mucilage event was also evaluated during this study period. The confined upper layer of the Sea of Marmara is mesotrophic to eutrophic and has higher productivity when compared to the neighbouring Black Sea and Aegean Sea. 132 taxa in the micro-phytoplankton community were identified, 11 of which are known to be potentially toxic. The most abundant species were Pseudo-nitzschia species from diatoms and Prorocentrum micans from dinoflagellates. Potentially toxic species were more common at the coastal stations. The onset of a mucilage formation was observed in October 2007, and well-known mucilage producers such as Gonyaulax hyalina (reported as G. fragilis) and Thalassiosira gravida (reported as T. rotula) dominated the phytoplankton community during this event. A marked decrease in the number of species and diversity index following June 2007 and reported shifts in the zooplankton community during the same period points to probable cascading effects in the pelagic ecosystem of the Sea of Marmara.

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“…Many studies of phytoplankton composition have been performed in estuaries around the Mediterranean Sea (Trigueros & Orive, 2001; Burić et al ., 2007; Barbosa et al ., 2010). Recently, studies have focused on phytoplankton communities of the Golden Horn Estuary (GHE) by microscopic analysis including the variations in phytoplankton composition (Tas et al ., 2009; Dursun & Tas, 2019), planktonic diatom composition (Tas, 2017; Tas & Hernández-Becerril, 2017), and algal blooms and potentially harmful species (Tas & Okus, 2011; Tas, 2015, 2019; Tas & Yilmaz, 2015; Dursun et al ., 2016; Tas & Lundholm, 2017). However, no study has been performed in the GHE using HPLC, despite HPLC pigment signatures being widely used in Turkish seas (Ediger et al ., 2006; Eker-Develi et al ., 2012; Agirbas et al ., 2017; Yücel, 2017).…”

Section: Introductionmentioning

confidence: 99%

Assessment of phytoplankton group composition in the Golden Horn Estuary (Sea of Marmara, Turkey) determined with pigments measured by HPLC-CHEMTAX analyses and microscopy

2021

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Phtytoplankton group composition determined by microscopy was compared with high performance liquid chromatography (HPLC) derived from pigment signatures in surface water samples taken bi-weekly and monthly between October 2018 and September 2019 in the Golden Horn Estuary (Sea of Marmara). A total of 80 eukaryotic phytoplankton taxa belonging to eight algal classes were identified in surface water during the study period. Forty-three taxa (54%) were diatoms, 29 taxa (36%) were dinoflagellates and eight taxa (10%) were other phytoflagellates. The average contribution of diatoms to total phytoplankton abundance decreased considerably (41 to 25%), while the average contribution of dinoflagellates and other phytoflagellates increased markedly (59 to 75%) from the lower to the middle estuary. Chlorophyll-a and seven other group-specific pigments, including fucoxanthin, peridinin, chlorophyll-c1 + c2, alloxanthin, 19′-hexanoyloxyfucoxanthin, 19′-butanoyloxyfucoxanthin and divinyl chlorophyll-a were identified in the study area. The relative contribution of the major phytoplankton groups to chlorophyll-a was estimated on three different initial ratio matrices by CHEMTAX. The results obtained were compared with those from microscopic examination. It was concluded that the CHEMTAX method was not accurate enough to characterize the phytoplankton community in the Golden Horn Estuary ecosystem and microscopic analysis was essential to determine the major contributing species to chlorophyll-a.

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Spring bloom of the raphidophycean Heterosigma akashiwo in the Golden Horn Estuary at the northeast of Sea of Marmara

Cited by 10 publications

References 19 publications

Variations in abundance and diversity of phytoplankton in the surface waters of the Golden Horn Estuary (Sea of Marmara)

Variations in abundance and diversity of phytoplankton in the surface waters of the Golden Horn Estuary (Sea of Marmara)

Temporal variations in phytoplankton composition in the northeastern Sea of Marmara: potentially toxic species and mucilage event

Assessment of phytoplankton group composition in the Golden Horn Estuary (Sea of Marmara, Turkey) determined with pigments measured by HPLC-CHEMTAX analyses and microscopy

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