Senem Caglar

Mollusca Fauna Of The Sea Of Marmara

The effects of polycyclic aromatic hydrocarbon contamination and grazing on the abundance and composition of microphytobenthos in salt marsh sediments (Pass Fourchon, LA)

Journal of Experimental Marine Biology and Ecology, 1999

A microcosm experiment was conducted to examine the effects of polycyclic aromatic hydrocarbon (P... more A microcosm experiment was conducted to examine the effects of polycyclic aromatic hydrocarbon (PAHs) contamination on the abundance and composition of microphytobenthos in surface (0-10 cm) sediments collected from a salt marsh in Pass Fourchon, LA. Plant pigment biomarkers were used to monitor changes in the microphytobenthos in sediments (over 60 days) with treatments containing high and low concentrations of PAHs. Grazing pressure on microphytobenthos by the periwinkle snail Littorina irrorata as well as its responses to PAH contamination were also examined. Concentrations of total PAHs declined in sediments over the duration of the experiment in all microcosms. There was a pattern of increasing relative abundance of high-molecular-weight PAHs in High-PAH sediments (5.5-16 ppm). Microphytobenthic biomass, estimated by chlorophyll-a concentrations, did not significantly change in the treatments with Low-PAH sediments (0.04-0.33 ppm); however, biomass decreased significantly in all treatments after 4 days from 64 mg to 2-8 21 mg g dry sed.. Concentrations of the carotenoids fucoxanthin (a biomarker for diatoms) and zeaxanthin (a biomarker for cyanobacteria) were consistent with chlorophyll-a, showing little change in Low-PAH treatments; sediments from the High-PAH treatments showed significantly 21 higher concentrations of fucoxanthin and zeaxanthin (1.8 and 1.2 mg g dry sed. , respectively) than the Low-PAH treatments during the initial phase of the microcosm experiment. However,

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A Case Study: Ecological Quality Status of Susurluk River Basin (Marmara Sea)

Three Bivalve Species New to the Turkish Levantine Sea

Presence of three bivalve species ( Nucula nitidosa Winckworth, 1930; Acanthocardia echinata (Lin... more Presence of three bivalve species ( Nucula nitidosa Winckworth, 1930; Acanthocardia echinata (Linnaeus, 1758); Abra longicallus (Scacchi, 1835)), previously unknown from Turkish Levantine Sea, was revealed by this study carried out in Iskenderun Bay in the year 2005. Data about some ecological features of these species was provided.

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Polychaetes from the northern part of the Sea of Marmara with the description of a new species of Polydora (Annelida: Polychaeta: Spionidae)

Mediterranean Marine Science, 2015

Soft-bottom material collected from the northern part of the Sea of Marmara (off Küçükçekmece) in... more Soft-bottom material collected from the northern part of the Sea of Marmara (off Küçükçekmece) included a total of 67 species belonging to 24 polychaete families. Three species (Brania pusilla, Lysidice cf. margaritacea and Sabellaria spinulosa) are new records for the Sea of Marmara. Three alien species (Polydora cornuta, Prionospio pulchra and Pseudopolydora paucibranchiata) were found at the shallow-water stations. Different polychaete assemblages occurred in the area and the mud percentage of sediment and salinity were the main factors related to their distribution. A new Polydora species, which is mainly characterized in having brownish pigmentation solely on the antero-dorsal sides of the body, and falcate major spines with only a bulge (anterior ones) or with a bulge and a small tooth, is described.

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Assessment of ecological quality status of Küçükçekmece Bay (Marmara Sea) by applying BENTIX, AMBI, BOPA and BO2A biotic indexes

Mediterranean Marine Science, 2012

This study was carried out to explore the effectiveness of different biotic indexes in the Marmar... more This study was carried out to explore the effectiveness of different biotic indexes in the Marmara Sea. The assessment of ecological quality status (EQS) was performed by applying the biotic indexes BENTIX, AMBI, BOPA, BO2A and Shannon-Wienerdiversity, in combination with the estimation of total organic carbon (TOC) content of sediments. BOPA and BO2A indexes tended to overestimate the EQS of the stations. BENTIX was the most efficient index as it demonstrated conceivable EQS results with respect to TOC load and successfuly determined “acceptable” or “not acceptable” status of the stations. TOC content of sediment, which significantly correlated with several benthic measures (S, N, AMBI, BENTIX), proved to be a valuable proxy measure in evaluating the likelihood of benthic impairment. When overall EQS of northern Marmara Sea was discussed, the region was designated as ecologically disturbed with only 25.7% of the stations in acceptable status.

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On the presence of Siphonaria belcheri Hanley, 1858 [Gastropoda: Siphonariidae] and Septifer bilocularis (Linnaeus, 1758) [Bivalvia: Mytilidae] in the Iskenderun Bay (SE Turkey)

Aquatic Invasions, 2006

Siphonaria belcheri and Septifer bilocularis were reported from Iskenderun Bay in 2001. But they ... more Siphonaria belcheri and Septifer bilocularis were reported from Iskenderun Bay in 2001. But they were considered as misidentifications of Siphonaria crenata and Septifer forskali respectively, in the CIESM Atlas of Exotic Species. The present study, carried out in 2005-2006, indicates the presence of these two alien molluscs in Iskenderun Bay, Turkey.

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Golden Horn Estuary: Description of the ecosystem and an attempt to assess its ecological quality status using various classification metrics

In this paper, we describe the pelagic and benthic ecosystem of the Golden Horn estuary open-ing ... more In this paper, we describe the pelagic and benthic ecosystem of the Golden Horn estuary open-ing into the Marmara Sea. To improve the water quality of the estuary, which had long been subject to severe anthropogenic pollution (industrial, chemical, shipping), industrial facilities were moved from the estuary in the 1980s, followed by a rehabilitation plan in the 1990s. Our results, based on chemical parameters and phytoplankton showed some signs of improvement of water conditions in the upper layer. However, macrozoobenthic findings of this study did not reflect such a recovery in bottom life. An approach to the Ecological Quality Status (EQS) assessment was performed by applying the biotic indices BENTIX, AMBI, BOPA, BO2A. Our final assessment was based on "expert-judge-ments" and revealed a very disturbed overall ecosystem with "bad" EQS for the station at the head of the estuary, "poor" in the rest of the estuary and "moderate" EQS only in ...

Golden Horn Estuary: Description of the ecosystem and an attempt to assess its ecological quality status using various classification metrics

medit-mar-sc.net

Albayrak, S., Balkıs, N., Balkıs, H., Zenetos, A., Kurun, A., Karhan, S.Ü., Çağlar, S., Balcı, M.,2010. Golden Horn Estuary: Description of the ecosystem and an attempt to assess its ecological quality status using various classification metrics. Medit. Mar. Sci. 11 (2), 295-313

Golden Horn Estuary: Description of the ecosystem and an attempt to assess its ecological quality status using various classification metrics

Mediterranean Marine Science, 2010

In this paper, we describe the pelagic and benthic ecosystem of the Golden Horn estuary opening ... more In this paper, we describe the pelagic and benthic ecosystem of the Golden Horn estuary opening into the Marmara Sea. To improve the water quality of the estuary, which had long been subject to severe anthropogenic pollution (industrial, chemical, shipping), industrial facilities were moved from the estuary in the 1980s, followed by a rehabilitation plan in the 1990s. Our results, based on chemical parameters and phytoplankton showed some signs of improvement of water conditions in the upper layer. However, macrozoobenthic findings of this study did not reflect such a recovery in bottom life.An approach to the Ecological Quality Status (EQS) assessment was performed by applying the biotic indices BENTIX, AMBI, BOPA, BO2A. Our final assessment was based on 'expert-judgements' and revealed a very disturbed overall ecosystem with 'bad' EQS for the station at the head of the estuary, 'poor' in the rest of the estuary and 'moderate' EQS only in the midd...

format_quoteThe TRIX index ranged from 2.6 to 3.3, indicating low trophic levels and improving ecological quality in the Golden Horn Estuary.format_quote

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Albayrak, S., Balkıs, N., Balkıs, H., Zenetos, A., Kurun, A., Karhan, S.Ü., Çağlar, S., Balcı, M.,2010. Golden Horn Estuary: Description of the ecosystem and an attempt to assess its ecological quality status using various classification metrics. Medit. Mar. Sci. 11 (2), 295-313

by Serhat Albayrak, Ayşegül Mülayim, and Senem Caglar

Three Bivalve Species New to the Turkish Levantine Sea

by Serhat Albayrak and Senem Caglar

Presence of three bivalve species (Nucula nitidosa Winckworth, 1930; Acanthocardia eellinata (Lin... more Presence of three bivalve species (Nucula nitidosa Winckworth, 1930; Acanthocardia eellinata (Linnaeus, 1758); Abra longicallus (Scacchi, 1835)), previously unknown from Turkish Levantine Sea, was revealed by this study carried out in Iskenderun Bay in the year 2005. Data about some ecological features of these species was provided. Ozet 2005 yilmda iskenderun Korfezi'nde gen,:ekle~tirjlen bu yah~ma sonucunda Ttirkiye'nin Levant Denizi Iayilanndan daha once bilinmeyen tiy bivalv tUrtintin (Nunda nitidosa Winckworth, 1930; Acanthocardia echinata (Linnaeus, 1758; Abra longicallus (Scacchi, 1835)) varlIgl ortaya Ylkanlm)~tlr. Bu ttirlerin bazl ekolojik ozellikleri hakkmda bilgi verilmi~tir. Studies on the invertebrate fauna of the Turkish seas started in the late 19th century and centred first in the Marmara Sea and later in the Aegean Sea. Until recently, such faunistic studies were absent in the Turkish Levantine Sea for a long time when interest on the malacofauna revived, t...

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Assessment of ecological quality status of Küçükçekmece Bay (Marmara Sea) by applying BENTIX, AMBI, BOPA and BO2A biotic indexes

by Serhat Albayrak and Senem Caglar

Mediterranean Marine Science, 2012

This study was carried out to explore the effectiveness of different biotic indexes in the Marmar... more This study was carried out to explore the effectiveness of different biotic indexes in the Marmara Sea. The assessment of ecological quality status (EQS) was performed by applying the biotic indexes BENTIX, AMBI, BOPA, BO2A and Shannon-Wiener diversity, in combination with the estimation of total organic carbon (TOC) content of sediments. BOPA and BO2A indexes tended to overestimate the EQS of the stations. BENTIX was the most efficient index as it demonstrated conceivable EQS results with respect to TOC load and successfuly determined "acceptable" or "not acceptable" status of the stations. TOC content of sediment, which significantly correlated with several benthic measures (S, N, AMBI, BENTIX), proved to be a valuable proxy measure in evaluating the likelihood of benthic impairment. When overall EQS of northern Marmara Sea was discussed, the region was designated as ecologically disturbed with only 25.7% of the stations in acceptable status.

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On the presence of Siphonaria belcheri Hanley, 1858 [Gastropoda: Siphonariidae] and Septifer bilocularis (Linnaeus, 1758) [Bivalvia: Mytilidae] in the Iskenderun Bay (SE Turkey)

by Serhat Albayrak and Senem Caglar

Aquatic Invasions, 2006

Siphonaria belcheri and Septifer bilocularis were reported from Iskenderun Bay in 2001. But they ... more Siphonaria belcheri and Septifer bilocularis were reported from Iskenderun Bay in 2001. But they were considered as misidentifications of Siphonaria crenata and Septifer forskali respectively, in the CIESM Atlas of Exotic Species. The present study, carried out in 2005-2006, indicates the presence of these two alien molluscs in Iskenderun Bay, Turkey.

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Polychaetes from the northern part of the Sea of Marmara with the description of a new species of Polydora (Annelida: Polychaeta: Spionidae)

by Serhat Albayrak, Ertan DAGLI, and Senem Caglar

Mediterranean Marine Science

Soft-bottom material collected from the northern part of the Sea of Marmara (off Küçükçekmece) in... more Soft-bottom material collected from the northern part of the Sea of Marmara (off Küçükçekmece) included a total of 67 species belonging to 24 polychaete families. Three species (Brania pusilla, Lysidice cf. margaritacea and Sabellaria spinulosa) are new records for the Sea of Marmara. Three alien species (Polydora cornuta, Prionospio pulchra and Pseudopolydora paucibranchiata) were found at the shallow-water stations. Different polychaete assemblages occurred in the area and the mud percentage of sediment and salinity were the main factors related to their distribution. A new Polydora species, which is mainly characterized in having brownish pigmentation solely on the antero-dorsal sides of the body, and falcate major spines with only a bulge (anterior ones) or with a bulge and a small tooth, is described.

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