The ecological and physiological state of the ctenophore Mnemiopsis leidyi (Agassiz) in the Black Sea in autumn 1996

Anninsky, BE
Romanova, ZA
Abolmasova, GI
Gücü, Ali Cemal
Kideys, AE
The survey was made in off-shore waters of the Black Sea near the Anatolian coast of Turkey during a research cruise of the R/V Bilim (24 Sept - 4 Oct 1996). The biomass of gelatinous macroplankton and the glycogen content in the body of the ctenophore Mnemiopsis leidyi were studied at 14 stations. Though the ctenophore still dominated the plankton in terms of biomass (average biomass +/- standard deviation 276 +/- 115 g/m(2)), this estimate was significantly lower than corresponding estimates obtained for the same months in recent years. A simultaneous reduction in the stock of small-sized fodder zooplankton and the large copepod Calanus euxinus indicates this case may be due to a general aggravation of trophic conditions for ctenophores. Data on the ctenophore's body glycogen content varied from 21 to 44 mu g/g fresh weight and accounted for 52.5 +/- 14.2% of total polysaccharide content on average, the condition of M. leidyi observed during the conducted survey corresponded to that expected after a two-day fasting period. Tentative experiments have shown that metabolic rates of the examined ctenophores were notably reduced. The rate of oxygen consumption (R, mu l O-2 . ind(-1) . h(-1)) was 1.7-1.8 less than that which would indicate a sufficient food supply; depending on the estimate of fresh body weight (UT, g) at 12-14 degrees C, it may be described by the following equation: R = 2.50 W-0.83.


A comparison of the contribution of zooplankton and nekton taxa to the near-surface acoustic structure of three Turkish seas
Mutlu, E (Wiley, 2005-03-01)
The bioacoustics of upper waters of the Black Sea, the Sea of Marmara, and the Mediterranean Sea were studied in October 1999 with an echosounder with 120 and 200 kHz dual-beam transducers. Net tows were taken to ground-truth the acoustic volume backscattering. A forward solution was applied to determine significant scatterers of the three seas with regard to detection limits of the frequencies and background noise measured in each sea. The noise was 4 dB higher in the Sea of Marmara than in the other two s...
The annual cycle of Synechococcus (cyanobacteria) in the northern Levantine Basin shelf waters (Eastern Mediterranean)
Uysal, Zahit (2006-09-01)
Abundance of picoplanktonic chroococcoid marine cyanobacteria Synechococcus was monitored weekly over the year 1998 in shallow coastal waters of the northern Levantine Basin. The ambient physical, chemical and biological variables (temperature, salinity, Secchi disk depth, total suspended sediment, nitrate, phosphate, Chl a and phytoplankton) were also measured. Synechococcus was found to be more abundant during summer and early autumn and less during winter and early spring. At the surface and 15 m depth, ...
A net plankton study in the Bosphorus junction of the Sea of Marmara
Uysal, Zahit (1995-01-01)
A 16-month study of diatoms (>55 micrometers) and certain groups of Zooplankton was carried out at 21 stations in the Bosphorus junction of the Sea Marmara on board the FW "Bilim". The maximum diatom bloom was observed in January 1986, followed by a less frequent secondary flowering in summer. Both the diatom and Zooplankton maxima were observed at 10 m. The lowest levels were attained below the halocline at a depth of 30 m. Remarkable variations, both in the species composition and abundance of diatoms, we...
The distribution and fishing of two Mediterranean Eledone spp. (Octopoda: Cephalopoda) in the Aegean Sea
Salman, Alp; Katagan, Tuncer; Gücü, Ali Cemal (2000-01-01)
The spatial distributions of Eledone cirrhosa (Lamarck, 1798) and Eledone moschata (Lamarck, 1798) were examined based on four seasonal trawl surveys carried out between 1991-1992 covering 20-500 meters of the Turkish and international waters in the Aegean Sea. It was found that E. cirrhosa inhabits all depth ranges examined in the northern part, but it was seldom observed in the south. E. moschata, on the other hand, has a basin-wide distribution and solely inhabits the upper 200-meter depth range.
The Effect of the Use of Wave Data for the Numerical Simulation of Shoreline Evaluation
Guler, Isikhan; Ergin, Ayşen; Yalçıner, Ahmet Cevdet (1998-03-01)
Manavgat River flows into the Mediterranean sea at southern coasts of Turkey. The river mouth being unstable shoals and shifts seasonally, preventing continuous navigation of boats and yachts through the entrance channel of river mouth. To stabilize the river mouth some alternative structures are studied and jetty type structure is chosen as the protection structure. The shoreline change of the Manavgat River mouth with and without protection structure is studied by using one line model for shoreline evolut...
Citation Formats
B. Anninsky, Z. Romanova, G. Abolmasova, A. C. Gücü, and A. Kideys, “The ecological and physiological state of the ctenophore Mnemiopsis leidyi (Agassiz) in the Black Sea in autumn 1996,” 1998, vol. 47, Accessed: 00, 2020. [Online]. Available: