Vol.20 – 2014 – No.3

Preliminary report of a conjoined bottlenose dolphin (Tursiops truncatus) calf stranded on the Aegean Sea coast of Turkey

Maximum size of saddled bream, Oblada melanura (Linnaeus, 1758) (Osteichthyes: Sparidae), in the southern Aegean Sea, Turkey

Okan Akyol, Ali Kara, Cemil Sağlam

Faculty of Fisheries, Ege University, 35440, Izmir, TURKEY

Abstract

A specimen of the saddled bream, Oblada melanura, with 357 mm TL, was caught on 30 April 2014 by gillnet fishery in Kokar Cove, Sığacık Bay, the southern Aegean Sea. The present study reports not only the second maximum length record of O. melanura for the Mediterranean, but also the maximum record for the Turkish seas.

Keywords: Saddled bream, Oblada melanura, maximum length, Sığacık Bay, Aegean Sea

References

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Marine isopods (Crustacea) of Sinop Bay (Black Sea, Turkey)

Fevzi Kırkım, Tahir Özcan, Murat Sezgin, Mehmet Çulha, Tuncer Katağan

Department of Hidrobiology, Faculty of Fisheries, Ege University, 35100, Izmir, TURKEY
Faculty of Marine Sciences and Technology, Mustafa Kemal University, 31200, Hatay, TURKEY
Department of Marine Biology and Ecology, Faculty of Fisheries, Sinop University, 57000, Sinop, TURKEY
Department of Marine Biology, Faculty of Fisheries, Katip Celebi University, 35100, Izmir, TURKEY

Abstract

The aim of the present study was to identify common isopod species of the Sinop coast, and to provide new data that would be useful in the process of characterizing the isopod fauna of the Turkish Black Sea. The samples were collected seasonally at 12 stations (depths 0.5-15 m). A total of 2457 individuals belonging to eight species of marine Isopoda (Crustacea) were recorded. Among these species; Joeropsis brevicornis littoralis and Eurydice spinigera were reported for the first time in the Black Sea coast of Turkey. Idotea balthica had the highest dominance value with up to 980 individuals (80.59% of total individuals). According to Soyer’s Frequency Index, two species were constant, the other six species as rare in the study area.

Keywords: Isopoda, fauna, diversity, Sinop Peninsula, Black Sea

References

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Gozler, A.M., Kopuz, U., Agirbas, E. (2010) Seasonal changes of invertebrate fauna associated with Cystoseira barbata facies of Southeastern Black Sea coast. African Journal of Biotechnology 9(51): 8852-8859.

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Karaçuha, M.E., Sezgin, M., Dağli, E. (2009) Temporal and spatial changes of crustaceans in mixed eelgrass beds, Zostera marina L. and Z. noltii Hornem., at the Sinop Peninsula coast (the southern Black Sea, Turkey). Turkish Journal of Zoology 33: 375-386.

Kırkım, F., Sezgin, M., Katağan, T., Bat, L., Aydemir-Cil, E. (2006) Some benthic soft-bottom crustaceans along the Anatolian coast of the Black Sea. Crustaceana 79(11): 1323-1332.

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Poor, G.C.B., Bruce, N.L. (2012) Global diversity of marine isopods (except Asellota and Crustacean symbionts). PLoS ONE.7(8): e43529. doi:10.1371/journal.pone.0043529.

Sezgin, M., Aydemir-Cil, E. (2010) Rocky bottom Crustacean fauna of Sinop (Black Sea, Turkey) coast. Zoologica Baetica 21: 5-14.

Anatomical features of Cymodocea nodosa growing in Montenegro (Adriatic Sea)

Vesna Mačić

Institute of Marine Biology, 85330, Kotor, MONTENEGRO

Abstract

Compared to morphological studies of Cymodocea nodosa (Ucria) Asch. the anatomy of this protected seagrass was poorly studied, and the anatomical features of the C. nodosa leaf were not described for the South-East Adriatic Sea at all. This study was performed on three C. nodosa meadows in the Bay of Boka Kotorska (Montenegro, Adriatic Sea) and anatomical characteristics of sheaths and leaf blades are presented. On the cross-section of the sheaths, dorsal epidermal cells are smaller compared to the ventral epidermis, while on the leaf blade epidermis, there are no significant differences between the two sides. The mesophyll is situated below the epidermis. These cells are positioned around large air lacunaes, thus the mesophyll could be also called aerenchyma tissue. Vascular bundles are reduced compared to the vascular plants and always seven vascular bundles were counted (in the sheaths and leaf blade). Between the epidermis and mesophyllum, especially close to the vascular bundles and on the edges of the leaf, mechanical tissue is situated. Many tannin cells were observed. More detailed analysis would be necessary to explain differences and to compare them with the populations from other parts of the Mediterranean basin.

Keywords: Seagrass, Cymodocea nodosa, anatomy, Adriatic, Montenegro

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A list of macrofauna on the continental shelf of Gökçeada Island (northern Aegean Sea) with a new record (Gryphus vitreus Born, 1778) (Brachiopoda, Rhynchonellata) for the Turkish seas

Onur Gönülal, Sedat Ozan Güreşen

Gökçeada Marine Research Department, Faculty of Fisheries, Istanbul University, Gökçeada, Çanakkale,TURKEY

Abstract

Long-term sampling (1974-2013) of macro fauna of the Gökçeada Island (northern Aegean Sea) provided qualitative information on many taxa including Porifera, Cnidaria Mollusca, Arthropoda, Brachiopoda, Bryozoa, Spinculida, Echinodermata, Chordata. Gryphus vitreus(Brachiopoda) and Funiculina quadrangularis (Pallas, 1766) are the first records for the Turkish seas and the Aegean coast of Turkey, respectively. The present paper aims to describe macrofauna occurring on the continental shelf of Gökçeada Island. This checklist yes,was based mainly on review of the literature published since 1974 and studies conducted at Gökçeada Marine Research Department in 2007-2013. The present paper also reports a total of 10 alien species along the continental shelf of Gökçeada Island. Calinectes sapidus Rathbun, 1896 is one of the alien species of commercial importance.

Keywords: Macrofauna, Gökçeada, continental shelf, Gryphus vitreus

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Age, growth and reproduction of the rough ray, Raja radula (Delaroche, 1809) in Saros Bay (North Aegean Sea)

Cahide Çiğdem Yığın, Ali Işmen

Marine Science and Technology Faculty, Çanakkale Onsekiz Mart University, Terzioğlu Campus, Çanakkale, TURKEY

Abstract

In this study age, growth and reproduction of rough ray (Raja radula) were investigated using 261 specimens from Saros Bay (North Aegean Sea) sampled between February 2005 and September 2008. Females made up 56.3% and males 43.7% of the total individuals studied. The total length of females and males ranged between 17 and 61 cm (Disc width; 11.1-39.8 cm), and between 19 and 54 cm (Disc width; 12.5-34.2 cm), respectively. The total length (TL)-weight (W) and disc width (DW)-weight relationships were described by the equations W=0.0018*TL3.35 and W=0.0081*DW3.32, respectively. Age data derived from vertebrae readings were used to estimate the growth parameters of von Bertalanffy equation: L∞=74.70 cm, K=0.20y-1, t0=-0.22y for males, and L∞=82.94 cm, K=0.16y-1, t0=-0.59y for females. The maximum age was 6 for males and 8 for females. Total length at first maturity of males and females was 40 and 46 cm, respectively.

Keywords: Raja radula, age, growth, reproduction, Saros Bay

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Seasonal and vertical variations of phytoplankton composition in Marine Park of Gökçeada Island in the North Aegean Sea 

Aysu Güreşen, Yelda Aktan Turan

Faculty of Fisheries, Istanbul University, Istanbul, TURKEY

Abstract

This study was conducted to understand the seasonal and vertical variations in the composition and abundance of phytoplankton assemblages in the Marine Park of Gökçeada Island and to evaluate the relations of phytoplankton community structure with the environmental parameters. Water samples were taken from the water column at surface water, 10 m, 20 m and 28 m depths in Yıldız Bay seasonally between May 2009 and January 2010. A total of 28 species belonging to Bacillariophyceae (61%) and 18 species belonging to Dinophyceae (39%) were identified. Cerataulina pelagica, Cylindroteca closterium, Leptocylindrus minumus from Bacillariophyceae were present in all seasons and reached high individual numbers that these species have a wide ecological tolerance to environmental factors. Prorocentrum micans from Dinophyceae was present throughout the seasons in small numbers. The maximum density of total phytoplankton (67987 cells L⁻¹) was observed in the winter period. Accordingly the water became turbid by mucilage clouds due to the excessive growth of the species known as producing mucilage, Skeletonema costatum, Cylindrotheca closterium and Gonyaulax fragilis. The ratio of nitrogen to phosphorus in the water column was recorded high (50.9) in this period. Lowest diversity and similarity between seasons were recorded in the summer period due to the excessive growth of Proboscia alata from Bacillariophyceae. Consequently it can be assumed that since Yıldız Bay is exposed to touristic activities in summer months, environmental disturbance causes unnecessary growth of opportunistic species and these species reduce the species diversity in the region by pressuring the growth of other species.

Keywords: Phytoplankton, Marine Park of Gökçeada, North Aegean Sea, Eastern Mediterranean

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Mukadder Arslan, Ali İşmen

Faculty of Marine Science and Technology, Çanakkale Onsekiz Mart University, 17100, Çanakkale, TURKEY

Abstract

The age, growth, food and reproduction of Mullus barbatus, caught in Saros Bay (North Aegean Sea) between September 2006 and September 2008, were investigated. The female-male ratio was 1:0.6. The total length (weight) of females ranged from 9.2 cm to 23.6 cm (7.5 g to 177.3 g) and of males from 8.8 cm to 24.1 cm (7.8 g to 119.7 g). The growth parameters were estimated using otolith readings and length frequencies by ELEFAN program separately and growth parameters were calculated as L∞=28.75 cm, K=0.16 year-1, t0=-1.92 year using otoliths and L∞=26.25 cm, K=0.41 year-1, t0=-0.68 year using ELEFAN program. The length at first maturity for females and males was 11.9 cm and 12.1 cm, respectively. Monthly values of the gonadosomatic index indicated that spawning occurred mainly between March and June.

Keywords: Mullus barbatus, growth, reproduction, feeding, Saros Bay, North Aegean Sea

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Temporal changes of copepod abundance and species compositions in the coastal water of Samsun, the southern Black Sea (Turkey)

Eda Deniz, Arif Gönülol

Department of Biology, Science and Arts Faculty, Ondokuz Mayıs University, Kurupelit, 55139, Samsun, TURKEY

Abstract

The copepod fauna in Samsun coastal region of the Black Sea was investigated between January 2008 and December 2008. Species composition and abundance as well as physichochemical factors which may influence on them were determined in the samples monthly collected at five stations in the research area. A Bray-Curtis similarity matrix was created from the copepod abundance data and the analyses of agglomerative hierrarchical cluster analysis and multi-dimensional scaling were performed using similarity matrix. A total of 10 species; including seven species Calanus euxinus Hulsemann, 1991; Paracalanus parvus (Claus 1863); Centropagaes ponticus Karavaev, 1894; Calanipedia aquaedulcis (Kritchagin, 1873); Acanthodiaptomus denticornis (Wierzjski 1857); Acartia (Acartiura) clausi Giesbrecht, 1889; Pseudocalanus elongatus(Boeck 1965) belonging to Calanoida, one species Oithona similis (Claus 1863) belonging to Cyclopoida and two species (Euterpina acutifrons Dana, 1852; Canuella perplexa T. and A. Scott, 1893) belonging to Harpacticoida were identified in the copepod community. The maximum abundance was observed in December 2008. The minimum abundances were, however, recorded in July and March 2008. Correlation coefficients between the physico-chemical parameters (temperature, Secchi disc, pH, electrical conductivity, TDS (Total dissolved substance), NH3-N, PO4, SiO2) and the abundance of the copepod species were calculated together with the significance levels.

Keywords: Copepoda, Black Sea, biodiversity, hierrarchical cluster analysis, MDS

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