Annual cycle of zooplankton abundance and species composition in Izmit Bay (the northeastern Marmara Sea)

İşinibilir, Melek; Kıdeyş, Ahmet E.; Tarkan, Ahmet Nuri; Yılmaz, I. Noyan

doi:10.1016/j.ecss.2008.02.013

Cited by 36 publications

(29 citation statements)

References 26 publications

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“…bottom-up control), while Chl-a concentration would not be affected mainly by Noctiluca abundance (i.e. top-down control), because in the latter case prey and grazer organism abundances normally would show an inverse relationship and there would be significantly negative correlation between them (Huang & Qi 1997, Isinibilir et al 2008. In spring, Noctiluca abundance showed stronger correlations with water temperature, salinity and PP than Chl-a, whereas in summer it showed stronger correlations with salinity, Chl-a and PP than with water temperature.…”

Section: Seasonal Variations In Abundancementioning

confidence: 99%

Seasonal variability of the red tide-forming heterotrophic dinoflagellate Noctiluca scintillans in the neritic area of Sagami Bay, Japan: its role in the nutrient-environment and aquatic ecosystem

Ara

Nakamura

Takahashi

et al. 2013

Plankton Benthos Res

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Abstract:The role of the heterotrophic dinoflagellate Noctiluca scintillans in affecting the nutrient-environment and aquatic ecosystem was investigated in the neritic area of Sagami Bay, Kanagawa, Japan, from January 2002 to December 2006, based on abundance, intracellular nutrient content, excretion rate and response of phytoplankton (diatoms) to enrichment of nutrients extracted from N. scintillans cells. Seasonal variations in abundance and vertical distribution of N. scintillans were significantly related to the physical structure of the water column, water temperature, chlorophyll a and primary productivity. Intracellular nutrient contents, except for Si(OH) 4 -Si, revealed clear seasonal fluctuations, which were significantly correlated to cell size variations. Thalassiosira rotula increased to higher cell abundances at higher concentrations of nutrients, which were extracted from N. scintillans cells. NH 4 + -N and PO 4 3--P excretion rates were much higher during the first 1-3 h, and decreased rapidly with time. Daily NH 4 + -N and PO 4 3--P supply by N. scintillans excretion was estimated to be on average 34.8% and 55.3%, especially 50.6-85.4% and 80.5-135.8% in April-July (monthly mean), of the daily N and P requirement for primary production, respectively. The large amounts of nutrients regenerated and released by N. scintillans excretion can increase the N and P concentrations in ambient seawater, especially in the upper layer in spring-summer, and consequently affect phytoplankton (diatom) abundance. These may exacerbate eutrophication in these waters by a mutually supportive relationship between phytoplankton and N. scintillans: bottom-up control (phytoplankton-N. scintillans) and nutrient supply by N. scintillans to phytoplankton through excretion.

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Section: Seasonal Variations In Abundancementioning

confidence: 99%

Seasonal variability of the red tide-forming heterotrophic dinoflagellate Noctiluca scintillans in the neritic area of Sagami Bay, Japan: its role in the nutrient-environment and aquatic ecosystem

Ara

Nakamura

Takahashi

et al. 2013

Plankton Benthos Res

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“…m -3 (Isinibilir et al 2009) and was, on average, 47 times higher than that in the north-eastern Marmara Sea. According to Isinibilir et al (2008Isinibilir et al ( , 2009, in the Marmara Sea, maximum abundance of C. euxinus was observed in spring, whilst this species nearly disappeared in summer, probably due to high temperatures in the surface and deep layers. On the contrary, in the off-shore regions of the Black Sea, where a cold (6 to 8°C) intermediate layer is constantly present, cold-water C. euxinus can develop all year round (Sazhina 1987, Vinogradov et al 1992b).…”

Section: Field Observationsmentioning

confidence: 99%

Salinity tolerance of Calanus euxinus in the Black and Marmara Seas

Svetlichny¹,

Hubareva²,

İşinibilir³

et al. 2010

Mar. Ecol. Prog. Ser.

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We investigated how stenohalinic Black Sea Calanus euxinus, when migrating to the north-eastern Marmara Sea, can adapt to the pronounced salinity gradient there. During field observations (2005 to 2008) females of Calanus euxinus with significantly smaller body length (compared with those inhabiting the brackish Black Sea at 17 to 18 psu) were found in the deep, high-saline (~38.5 psu) layers of the Marmara Sea. Similar diameters of eggs laid by small-and large-sized females and similar respiration rates in nauplii hatched from these eggs indicated the Black Sea origin of the C. euxinus population found in the Marmara Sea. To understand the morphological and physiological changes in C. euxinus during acclimation to high salinity, we studied the effect of salinity on behaviour, food consumption, growth patterns, hatching success and respiration rate of C. euxinus individuals collected in the Black and Marmara Seas. It was shown that the range of salinity tolerance for adult C. euxinus (17 to 30 psu) from the Black Sea was extended gradually to 40 psu after 1 d of acclimation to the high salinity of the Marmara Sea. Long-term parental salinity acclimation facilitates survival of eggs descending through the salinity gradient of the Marmara Sea, from brackish upper layers to deep, high-saline strata, or eggs laid in deep layers. While weight-specific respiration rates at the same temperature did not differ for C. euxinus juveniles from the Black and Marmara Seas, they were ~2 times higher in preadults and adults from the Marmara Sea than from the Black Sea. This may be the reason for the decrease in length and weight increments of these stages probably leading to the small-sized individuals of the seasonal C. euxinus population inhabiting the Marmara Sea.

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“…similis and O. nana are the most common species in the Sea of Marmara, found both in upper and lower layers of this sea (Isinibilir et al, 2008;2011). O. davisae occurs only in the upper water layer of Sea of Marmara and can easily be differentiated from O. similis and O. nana (Figure 2 present in the western Black Sea (Mihneva and Stefanova, 2013).…”

Section: Discussionmentioning

confidence: 99%

“…These related species are ecologically similar and they also have the same body size (Altukhov et al, 2014). Like O. davisae, O. nana is a eurythermic species and this species is present in the Sea of Marmara plankton all year round (Isinibilir et al, 2008). According to Isinibilir (2009), the highest numbers of O. nana were recorded in SeptemberNovember, and the minimal densities occurred between February and June.…”

Section: Discussionmentioning

confidence: 99%