Distribution of the alien ctenophore Mnemiopsis leidyi in the Caspian Sea in August 2001

In this study, spatial and vertical distributions of the invasive ctenophore Mnemiopsis leidyi in the Caspian Sea were evaluated by using data collected at 41 stations during the August 2001 cruise. A comparison of data from different depths revealed that M. leidyi were generally confined to surface waters. The maximum size of the ctenophore was only 41-45 mm, and the bulk of individuals (85.5%) were < 10 mm in length. The average and maximum biomasses of M. leidyi were calculated as 120 and 351 g wet weight m(-2), respectively. Whilst highest biomasses were observed in the western and central Middle Caspian Sea, hot spot areas of reproduction were present along the coasts of the western Caspian Sea, with abundance values of up to 2285 ind. m(-2). The impact of such high densities of M. leidyi is expected to be significant for the pelagic ecosystem of the Caspian Sea.


Distribution of gelatinous Macrozooplankton in the southern Black sea during 1996 1999
Kıdeyş, Ahmet Erkan (2001-01-01)
In this study, spatial and temporal distributions of three gelatinous macrozooplankton, the scyphozoan Aurelia aurita and the ctenophores Pleurobrachia pileus and Mnemiopsis leidyi, were evaluated using the data obtained from seven southern Black Sea cruises carried out from 1996 to 1999. A comparison of nets used for the sampling of gelatinous macrozooplankton illustrated the superiority of the Hensen net with a larger mesh size (300 mum) over the Nansen net (112 mum). P. pileus was mainly concentrated bel...
Porewater redox species and processes in the Black Sea sediments
Konovalov, Sergey K.; Luther, George W.; Yücel, Mustafa (2007-11-15)
During the 2003 KNORR and the 2005 ENDEAVOR cruises to the Black Sea, voltammetric solid-state microelectrode data were collected for the vertical distribution of redox species in porewaters from the upper 200 to 300 mm layer of sediments with nun vertical resolution. We discuss vertical distributions of dissolved sulfide, manganese and iron species in sediments from the oxic, suboxic, anoxic/sulfidic parts of the Black Sea. Results of voltammetric profiling demonstrate many processes governing the porewate...
Distribution of phytoplankton in the southern Black Sea in summer 1996, spring and autumn 1998
Eker-Develi, E; Kıdeyş, Ahmet Erkan (2003-03-01)
The species composition, abundance, and biomass of micro- (>15 mum) and nano- (<15 mu m) phytoplankton were studied along the southern Black Sea during June-July 1996 and March-April and September 1998. A total of 150 species were identified, similar to 50% of them being dinoflagellates. The average total phytoplankton abundance changed from 77 x 10(3) Cells l(-1) in spring to 110 x 10(3) cells l(-1) in autumn and biomass from 250 mu g l(-1) in summer to 1370 mu g l(-1) in spring. Based on the extensive sam...
Öztürk, İlayda Destan; Kıdeyş, Ahmet Erkan; Department of Marine Biology and Fisheries (2015-10-07)
Spatial distribution and composition of zooplankton was studied in the southern Black Sea at 46 stations in July 2013. The southern Black Sea was examined as three different study areas namely; western, central and eastern regions. Each region was also examined as inshore and offshore to determine the difference in zooplankton communities. Additionally a DNA barcoding study was also performed with samples collected from seven stations in the southern Black Sea to generate a gene library of zooplankton speci...
An indicator-based evaluation of Black Sea food web dynamics during 1960-2000
Akoğlu, Ekin; Salihoğlu, Barış; SOLİDORO, Cosimo (2014-06-01)
Four Ecopath mass-balance models were implemented for evaluating the structure and function of the Black Sea ecosystem using several ecological indicators during four distinctive periods (1960s, 1980-1987,1988-1994 and 1995-2000). The results exemplify how the Black Sea ecosystem structure started to change after the 1960s as a result of a series of trophic transformations, i.e., shifts in the energy flow pathways through the food web. These transformations were initiated by anthropogenic factors, such as e...
Citation Formats
A. E. Kıdeyş, “Distribution of the alien ctenophore Mnemiopsis leidyi in the Caspian Sea in August 2001,” MARINE BIOLOGY, pp. 163–171, 2003, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/29966.