Development and lipid storage in Calanus euxinus from the Black and Marmara seas: Variabilities due to habitat conditions

Svetlichny, Leonid; Kıdeyş, Ahmet E.; Hubareva, Elena; Beşiktepe, Şengül; İşinibilir, Melek

doi:10.1016/j.jmarsys.2005.09.003

Cited by 24 publications

(29 citation statements)

References 25 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: 75%

“…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%

“…However, C. euxinus CV POs dominated even at high food concentrations due to the long- (Fig. 3B), in contrast to summer and autumn (Svetlichny et al 2006) when only diapausing POs stayed in the OMZ at night. …”

mentioning

confidence: 98%

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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: 75%

Section: Population Structure Of Calanus Euxinusmentioning

confidence: 99%

mentioning

confidence: 98%

See 2 more Smart Citations

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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“…According to Isinibilir et al (2011), copepods constitute 79-93% of mesozooplankton in this region, with Acartia clausi Giesbrecht, 1889 being the most abundant species (Benli et al 2001). Previously, Svetlichny et al (2006) and Hubareva et al (2008) showed that individuals of A. clausi which are sensitive to high salinity and transferred from the Black Sea to the Marmara Sea through the Bosphorus Strait did not survive in the salinity gradient layers and, as a result, deepwater zooplankton of the southern Bosphorus mainly consisted of dead organisms of Black Sea origin. Oğuz and Öztürk (2011) also reported the important role of the salinity gradient in the Bosphorus Strait area as a barrier to species exchange between the two seas.…”

Section: Introductionmentioning

confidence: 99%

Interpopulation dynamics betweenAcartia clausi(Copepoda) andNoctiluca scintillans(Dinoflagellata) in the Bosphorus area of the Black and the Marmara Seas

İşinibilir

Hubareva

Svetlichny

2014

Italian Journal of Zoology

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The dynamics of abundance and biomass of Noctiluca scintillans (Dinoflagellata) and Acartia clausi (Copepoda) in the Bosphorus area of the Black and Marmara Seas during 2005-2009 has been analyzed. Despite the fact that the more abundant Black Sea zooplankton community permanently enters the Marmara Sea, A. clausi and N. scintillans have formed independent populations in the northeast of the Marmara Sea. This may be confirmed on the one hand by the positive correlations between the numbers of A. clausi and N. scintillans individuals in the Marmara Sea near the Bosphorus Strait and near the Prince Islands and, on the other hand, by a lack of correlation between the abundance of these species in the Marmara Sea and in the Bosphorus area of the Black Sea. The abundance of N. scintillans was 6-10 times lower in the Black Sea near the Bosphorus Strait than that in the Marmara Sea. A high correlation (r = 0.84) between the abundance of N. scintillans and the number of dead A. clausi females near the Bosphorus Strait in the Marmara Sea suggests an important role of necrozooplankton in the development of the dinoflagellate.

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Diet and prey preferences of larval and pelagic juvenile Faroe Plateau cod (Gadus morhua)

et al. 2020

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The availability of suitable prey during the early life of fish may determine recruitment to the adult population. Since larval and juvenile feeding can be highly selective, their preferences for certain prey species and sizes should be considered when estimating the availability of prey. In this study, diet composition (and prey preferences) of 4984 (1366) Faroe Plateau cod (Gadus morhua) larvae and juveniles between 3 and 63 mm sampled on the central Faroe shelf (62°N, 6.8°W) over an 8-year period was investigated. Cod preyed on successively larger food items as they grew. Yolk-sac larvae consumed phytoplankton, copepod eggs and nauplii before the yolk sac was exhausted. Copepod eggs followed by calanoid nauplii were the predominant and preferred food items in the early larval stage. In the late larval stage these were replaced by small to medium sized (0.6-1.2 mm) copepod species mainly Pseudocalanus sp., Acartia sp. and early stage Calanus finmarchicus, of which the two former species appeared most preferred. Temora longicornis was highly abundant in juvenile cod, but the preference for this species was neutral. Positive selection and high abundance of late stage (≥ 1.5 mm) C. finmarchicus was observed in early juveniles, but C. finmarchicus was replaced by decapod larvae in late juveniles. Other abundant prey species such as Oithona sp. and barnacle larvae occurred in varying numbers in the guts, but were generally not positively selected at any stage. Late larval and early juvenile cod appeared to suffer from unfavourable feeding conditions as they fed on smaller prey than what they prefer potentially indicating bottle necks in the feeding at these development stages.

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Development and lipid storage in Calanus euxinus from the Black and Marmara seas: Variabilities due to habitat conditions

Cited by 24 publications

References 25 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

Interpopulation dynamics betweenAcartia clausi(Copepoda) andNoctiluca scintillans(Dinoflagellata) in the Bosphorus area of the Black and the Marmara Seas

Diet and prey preferences of larval and pelagic juvenile Faroe Plateau cod (Gadus morhua)

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