Population structure, vertical distribution and diel migration of Sagitta setosa (Chaetognatha) in the south-western part of the Black Sea

Beşiktepe, Şengül; Ünsal, Mustafa

doi:10.1093/plankt/22.4.669

Cited by 31 publications

(31 citation statements)

References 19 publications

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Section: Respiration Ratesupporting

confidence: 74%

“…Similar Q 10 values were obtained by Vidal (1980c) and Ikeda et al (2001). ) was also found in the southwestern Black Sea in summer (Vinogradov et al 1995), autumn (Yuneva et al 1999, Besiktepe & Unsal 2000, Svetlichny et al 2006) and during the phytoplankton rich winter-spring period (Vinogradov et al 1992c).However, local densities of Calanus euxinus population in the Black Sea may be even higher, because preadults and adults usually ascend to subsurface layers at night and aggregate in the OMZ during daytime During all seasons late development stages of Calanus euxinus migrate in the morning to the OMZ where they reduce respiration rate and stop feeding (Vinogradov et al 1992a,b). CV and adults began to feed again during the night and ascend to the upper layers (Besiktepe et al 2005).…”

supporting

confidence: 77%

“…Usually, late copepodite stages and adults of Calanus euxinus are abundant predominantly in deep shelf or slope regions in the main stream of the Black Sea Rim Current whilst towards the coast the number of early developmental stages increases (Vinogradov et al 1992b ) was also found in the southwestern Black Sea in summer (Vinogradov et al 1995), autumn (Yuneva et al 1999, Besiktepe & Unsal 2000, Svetlichny et al 2006) and during the phytoplankton rich winter-spring period (Vinogradov et al 1992c). …”

Section: Population Structure Of Calanus Euxinusmentioning

confidence: 99%

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Development of Calanus euxinus during spring cold homothermy in the Black Sea

Svetlichny¹,

Yuneva²,

Hubareva³

et al. 2009

Mar. Ecol. Prog. Ser.

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In copepodites and adults of Calanus euxinus abundance, body length and weight, chemical composition and respiration rate in relation to age were studied during the cruise of R/V 'Knorr' in April 2003 in the southwestern Black Sea and in laboratory experiments. Data on morphology and physiology of C. euxinus collected during other seasons were also used in comparative analyses. At high concentrations of the diatom Proboscia alata during spring homothermy (6.8 to 8.5°C) C. euxinus did not undertake diel vertical migrations to the oxygen minimum zone (OMZ). The majority of the population was located above the OMZ, feeding on phytoplankton during nighttime and daytime whilst nearly 10% of copepodite stages IV and V (CIV and CV) and adults remained constantly in the OMZ. Although a diapausing stock of the population began to form in the OMZ, the majority of CV developed without diapause. The development times of copepodite stages at 8°C were determined on the basis of field observations of ontogenetic changes in carbon content and calculated absolute growth rates. Development time from CI to CV amounted to 22 d. In CV the time for lipid deposition from 0.008 ± 0.007 mm 3 in postmolts up to a maximum volume of 0.165 ± 0.054 mm 3 in intermolts constituted 26 d. The total generation time from eggs to adults is not less than about 66 d. KEY WORDS: Calanus euxinus · Lipid storage · Respiration · Growth · Black Sea · Spring cold · HomothermyResale or republication not permitted without written consent of the publisher Mar Ecol Prog Ser 374: 199-213, 2009 other hypothesis, Calanus, like other 'boreal relicts', entered the Black Sea when it was connected with the North Sea across Europe during the period of retreating glaciers (Zaitsev 2006). This is in agreement with the results of Papadopoulos et al. (2005) suggesting that the divergences between the northeastern Atlantic, Mediterranean and Black Sea C. helgolandicus populations are much older than the estimated dates of colonization of the Mediterranean and Black Seas. However, according to Polischuk (1984) the last connection between the North and Black Seas could have been in the Late Holocene (2800 to 2700 BP).Calanus euxinus is a dominant component of the zooplankton biomass in the Rim Current system of the Black Sea. The ecology of this species differs significantly from that of C. helgolandicus in other European seas due to the characteristics of the basin.Calanus helgolandicus typically inhabits saline waters (32 to 39 ‰) with temperatures of 9 to 20°C. This wide range is mainly due to seasonal variation; the temperature does not range widely between populations. Seasonal changes in abundance of C. helgolandicus are positively correlated with temperature (Bonnet et al. 2005) and food availability (Rey-Rassat et al. 2004). Overwintering C. helgolandicus descend to deep water and are separated spatially from the part of the population that develops in surface layers.In contrast, Calanus euxinus has adapted to the low salinity of the Black Sea waters (18...

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Section: Respiration Ratesupporting

confidence: 74%

supporting

confidence: 77%

Section: Population Structure Of Calanus Euxinusmentioning

confidence: 99%

See 1 more Smart Citation

Development of Calanus euxinus during spring cold homothermy in the Black Sea

Svetlichny¹,

Yuneva²,

Hubareva³

et al. 2009

Mar. Ecol. Prog. Ser.

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“…As reported from earlier studies that the surface waters of the southern Black Sea are always poor in terms of nutrients during the seasons when these waters are stratified (Basturk et al, 1994;Bingel et al, 1993;Codispoti et al, 1991). The variations in nutrient concentration are mainly due to sub-surface nutricline and mixing process (Besiktepe et al, 2000;Yayla et al, 2001). In the spring-autumn period of 1995-1996, average concentrations in the euphotic zone ranged regionally and seasonally from 0.16 to 1.5 μM for TNOx (mainly NO 3 ) and from 0.03 to 0.35 μM for phosphate (Yilmaz et al, 1998).…”

Section: Discussionmentioning

confidence: 89%

Untitled

Ağırbaş¹,

Feyzioglu²,

Kopuz³

2014

Turk. J. Fish. Aquat. Sci.

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“…This study constitutes a first attempt to compare the Nansen, Juday and WP2 nets, which were (and probably still are) used mostly in the Black Sea (see Kovalev et al, 1977;Konsulov, 1990;Besiktepe & Unsal, 2000;Vinogradov et al, 1992;Stefanova et al, 2012;Arashkevich et al, 2014) and the Baltic Sea (see Hernroth, 1987;Johansson et al, 1993;Flinkman et al, 1998;Ojaveer et al, 1998;Kornilovs et al, 2001;Mollmann et al, 2005). The effort was based on tests performed for a variety of parameters (abundance, biomass-total and per size classes-, taxonomic composition), for nets with the same shape and mouth diameter, but with different mesh size (Juday with 150, 180 and 200 µm mesh size), and for nets with different shape, mouth diameter and length, but the same mesh size (Juday-200 vs WP2-200), as well as for nets with different shape and mesh size.…”

Section: Discussionmentioning

confidence: 99%

Intercomparison of five nets used for mesozooplankton sampling

et al. 2015

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Intercomparison of nets commonly used for mesozooplankton sampling in the Black and Mediterranean seas was attempted within the SESAME (Southern European Seas: Assessing and Modelling Ecosystem Changes) project. Five nets were compared: three Juday nets equipped with 150 μm, 180 μm and 200 μm mesh size, a Nansen net (100 μm mesh size) and a WP2 (200 μm mesh size). Replicated samples were taken at one station in the western Black Sea offshore waters in April 2009. The samples were analyzed at species level (except for meroplankton), stages (for copepods) and body length was measured for all organisms. A decrease of total abundance values was observed with increasing mesh size, due to the significantly higher numbers of animals smaller than 1 mm in the samples obtained using fine mesh size rather than with coarser nets. Few comparisons were revealed significant as regards the abundance of 1-2 mm long animals, while no significance was detected for specimens larger than 2 mm. The above differences resulted in discripancies between nets as regards species and stage composition. Biomass values did not differ significantly between nets, due to the important contribution of the large animals (Calanus euxinus) to total biomass. The smallest and the largest animals revealed high variability between replicates collected using the Nansen, Juday-200 μm and WP2 nets. Correction factors were calculated for the conversion of abundance values between each pair of nets. The differences observed between nets regarding abundance and biomass, community taxonomic composition and size structure, as well as the estimated correction factors, provide useful information for the harmonization of data obtained using the above nets in the Black Sea.

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Population structure, vertical distribution and diel migration of Sagitta setosa (Chaetognatha) in the south-western part of the Black Sea

Cited by 31 publications

References 19 publications

Development of Calanus euxinus during spring cold homothermy in the Black Sea

Development of Calanus euxinus during spring cold homothermy in the Black Sea

Untitled

Intercomparison of five nets used for mesozooplankton sampling

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