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

Besiktepe, S
Unsal, M
The population structure of Sagitta serosa from the south-western part of the Black Sea was examined between May 1994 and December 1996. In addition, the vertical distribution and diel vertical migration of S.setosa were studied for juveniles (less than or equal to 5 mm) and adults (>5 mm) in April 1995, September 1995 and June 1996. The population structure studies showed that a new generation was introduced in September. Breeding was most intensive from June to November, indicated by the frequency of small-sized individuals. Diel vertical migration from the depth of the oxygen minimum zone to the surface was observed for adult S.setosa but not for juveniles. Juveniles were generally distributed above the seasonal thermocline. It is evident that adults are able to tolerate a wide range of oxygen concentrations and temperature.


Population dynamics and ecology of the invasive veined rapa whelk, Rapana venosa in the southern Black Sea
MUTLU, ERHAN; Kıdeyş, Ahmet Erkan; Şahin, Fatih; Erik, Gökhan; Aksu, Hakan; Erdem, Ercan; Karayücel, Sedat; Bat, Levent (2022-05-05)
© 2022 Elsevier LtdSpatial and temporal changes in some ecological characteristics (i.e. biomass, abundance, morphometrics, sex-composition, growth parameters and population dynamics) of the invasive veined rapa whelk (Rapana venosa) were studied off Sinop Bay, in the southern Black Sea. The whelk specimens were sampled from three depths (15 m, 25 m and 35 m) at monthly intervals between November 2005 and October 2007. Custom-made pots were deployed for the capture of R. venosa individuals. Monthly distribu...
Net phytoplankton discriminating patches along the southern Black Sea coast in winter 1990
Uysal, Zahit (2012-01-01)
Cold water formed on the western continental shelf of the Black Sea in February 1990 was studied. The band of cold water follows the coast and interacts with coastal geometry, resulting in winter phytoplankton blooms particularly along the southwestern coast. Species composition and surface spatial distribution of net phytoplankton (> 55 mu m) showed an apparent species differentiation between the shelf and open ocean plankton. Offshore waters exhibit high diversity indices compared to shelf waters where th...
Annual cycle of zooplankton abundance and species composition in Izmit Bay (the northeastern Marmara Sea)
Isinibilir, Melek; Kıdeyş, Ahmet Erkan; TARKAN, AHMET NURİ; Yılmaz, İsmail (2008-07-30)
The monthly abundance, biomass and taxonomic composition of zooplankton of Izmit Bay (the northeastern Marmara Sea) were studied from October 2001 to September 2002. Most species within the zooplankton community displayed a clear pattern of succession throughout the year. Generally copepods and cladocerans were the most abundant groups, while the contribution of meroplankton increased at inner-most stations and dominated the zooplankton. Both species number (S) and diversity (if) were positively influenced ...
Population dynamics and morphological variability of Calanus euxinus in the Black and Marmara Seas
İŞİNİBİLİR OKYAR, Melek; Svetlichny, L.; Hubareva, E.; ÜSTÜN, FUNDA; Yılmaz, İsmail; Kıdeyş, Ahmet Erkan; BAT, LEVENT (2009-01-01)
Temporal and spatial changes in abundance, prosome length, oil sac volume, molting patterns and morphometric parameters were studied in Calanus euxinus from the Black and Marmara Seas. In the south-western part of the Black Sea and deep shelf zone near Sinop the abundance of C. euxinus was high during the whole studied period (2000-2005), with a maximum 23,400 ind m-2 in March 2004. In the Marmara Sea near the Prince Islands in the deep zone the mean annual abundance of C. euxinus was 47 times lower than in...
Uysal, Zahit (2012-07-01)
Changes in species composition, abundance and biomass of copepods were monitored weekly over the year 1998 in shelf waters of the northern Levantine Basin. A total of 192 copepod species belonging to 61 genera were identified during the course of this study. Thirty-six species are reported for the first time from the region, including three new species. Copepod abundance ranged from 215 individuals m(-3) in early March to 2220 individuals m(-3) in late March, whereas the biomass ranged from 4 mg m(-3) in mi...
Citation Formats
S. Besiktepe and M. Unsal, “Population structure, vertical distribution and diel migration of Sagitta setosa (Chaetognatha) in the south-western part of the Black Sea,” JOURNAL OF PLANKTON RESEARCH, pp. 669–683, 2000, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/64653.