scholarly journals Biodiversity of freshwater macroinvertebrates on Gökçeada Island (North Aegean Sea, Turkey)

2021 ◽  
Vol 50 (4) ◽  
pp. 421-429
Author(s):  
Serpil Odabaşı
Keyword(s):  
New Records ◽  
Aegean Sea ◽  
Common Species ◽  
Freshwater Ecosystems ◽  
Tubifex Tubifex ◽  
Island Ecosystems ◽  
Aegean Islands ◽  
Wide Range ◽  
North Aegean ◽  
North Aegean Sea

Abstract Island ecosystems have attracted the attention of scientists since the early days of science because of their formation and biodiversity. Despite their abundant freshwater resources, data on freshwater diversity of Gökçeada are incomplete, especially for macroinvertebrates. This study was conducted in a wide range of freshwater ecosystems on Gökçeada between May 2016 and September 2018. Sampling of macroinvertebrates was performed using a hand net from 34 pre-selected sampling sites on the island. A total of 78 aquatic macroinvertebrate taxa were found, 46 of which are new records for the island. The most common species during the study were Gammarus komareki and Bythinella gokceadaensis with a frequency of 25.93%, followed by Tubifex tubifex, Gammarus sp. and Caenis sp. with a frequency of 22.22%. Endemic and invasive species on the island were assessed according to their presence and frequency values. Based on the results of the current study and previous data, it can be concluded that Gökçeada is characterized by a remarkable species diversity compared to aquatic macroinvertebrates on other Aegean islands.

Biometric investigations on the cnidae of the Aegean colour morphs of Anemonia viridis

2000 ◽  
Vol 80 (3) ◽  
pp. 543-544 ◽  
Author(s):  
Chariton C. Chintiroglou ◽  
Panagiotis Karalis
Keyword(s):  
Aegean Sea ◽  
Distinct Species ◽  
Common Species ◽  
The North ◽  
North Aegean ◽  
North Aegean Sea ◽  
Colour Morphs ◽  
Body Parameters ◽  
Maturity Grade ◽  
Anemonia Viridis

The sea anemone Anemonia viridis is one of the most common species of the North Aegean Sea. The variety in colour morphs exhibited by this species, causes problems to taxonomy and ecology, and suggests that A. viridis should be subdivided into two distinct species according to the colour of the individuals. The approach used in this study was based on the biometrical cnidae characteristics of the two colour morphs (rustica and smaragdina), as it is known that cnidae biometry has been used as a taxonomic tool for the phylum Cnidaria. More than 20,000 nematocysts were measured to try and find a correlation between these measurements and some body parameters indicative of the maturity grade of the individuals, as potential taxonomic characteristics. Stable cnidae characteristics of the two different colour morphs were compared. However, they differed only in the biometry of the tentacles' a-basitrichs. This slight difference does not support the proposal to subdivide Anemonia viridis into two different species.

scholarly journals Length-weight relationships of fishes caught by stationary uncovered pound nets in the coastal waters of Saros Bay, North Aegean Sea (Turkey)

2021 ◽  
Vol 38 (1) ◽  
pp. 95-99
Author(s):  
Serhat Çolakoğlu
Keyword(s):  
Fish Species ◽  
Coastal Waters ◽  
Aegean Sea ◽  
Mean Value ◽  
General Information ◽  
Pomatomus Saltatrix ◽  
Wide Range ◽  
The Status ◽  
North Aegean ◽  
North Aegean Sea

Stationary uncovered pound nets are passively fishing gears used for fish catching according to traditional methods in the coastal waters of Saros Bay, North Aegean Sea. The purpose of this study was to determine length-weight relations (LWRs) for a wide range of fish species collected from the traps in the coastal waters of Saros Bay. We are studied in the fish species caught by four traps between April and August (fishing season) in 2010 - 2012. A total of 23 fish species belonging to 12 families were caught individual 2.096. The mean value of the growth pattern (b) was 3.141±0.042, ranging from 2.711 to 3.577. Whereas they were negative allometric only for two species (Pomatomus saltatrix and Mugil cephalus), from other fish species were observed to be 13 positive allometric and 8 isometrics. The LWR parameters for the positive allometric and isometric fish species were significant (P<0.05). This study provides some general information about the status of the LWR parameters of the fish species caught from the traps.

Some early pottery of Samos, Kalimnos and Chios

1957 ◽  
Vol 22 ◽  
pp. 173-212 ◽  
Author(s):  
Audrey Furness
Keyword(s):  
Special Interest ◽  
Aegean Sea ◽  
Late Neolithic ◽  
The Balkans ◽  
The North ◽  
Aegean Islands ◽  
North Aegean ◽  
North Aegean Sea ◽  
Derivatives Of ◽  
Early Pottery

It is generally recognized that the neolithic arts, and prominent among them, the art of making pottery, spread from a Mesopotamian or Syrian centre westwards into Anatolia, the Aegean and so to the Danube: but in the present light of knowledge it is far from easy to demonstrate this process by means of comparisons of the earliest known pottery in each area. In particular the immediate origins of the Greek neolithic wares are obscure; and while they have good parallels in the Balkans, geographical considerations lead one to suppose that the Balkan cultures were derivatives of, rather than ancestral to, cultures of, for example, the North Aegean sea-board. In these circumstances, links between neolithic Macedonia and sites further east are of special interest. In this paper it is hoped to show, through a detailed comparative study of material from Samos, Kalimnos and Chios, that there existed in these East Aegean Islands a culture related to the earliest civilizations of Troy and Thermi (fig. 1), but which also exhibits parallels to Heurtley's ‘Late Neolithic’ material in Macedonia.The pottery from the lowest levels of Poliokhni in Lemnos almost certainly belongs to the series now to be described. The site, excavated throughout many seasons by the Italians, revealed three or more distinct strata beneath a level corresponding with early Troy I; but there are not many notices of it available and no illustrations or photographs. The recent publication by Brea in these Proceedings gives few details of the relevant levels.

Cetacean stranding and diet analyses in the North Aegean Sea (Greece)

2017 ◽  
Vol 98 (5) ◽  
pp. 1011-1028 ◽  
Author(s):  
C.B. Milani ◽  
A. Vella ◽  
P. Vidoris ◽  
A. Christidis ◽  
E. Koutrakis ◽  
...  
Keyword(s):  
Bottlenose Dolphins ◽  
Aegean Sea ◽  
Cetacean Species ◽  
Stenella Coeruleoalba ◽  
The North ◽  
Aegean Islands ◽  
North Aegean ◽  
Diet Analyses ◽  
North Aegean Sea ◽  
Common Dolphins

Cetacean stranding reports in the North Aegean Sea were recorded since 1998 from Strimonikos Gulf in Chalkidiki up to Alexandroupoli on the Turkish border and in a few northern Aegean islands. On site, the specimens were examined to identify species, gender, approximate age and, when possible, cause for stranding. A total of 26 filled stomachs of five cetacean species collected since 2002 were analysed: bottlenose dolphinsTursiops truncatus(N = 8), common dolphinsDelphinus delphis(N = 8), harbour porpoisesPhocoena phocoena(N = 5), striped dolphinsStenella coeruleoalba(N = 4) and Risso's dolphinsGrampus griseus(N = 1). From the analysed stomachs it was found that the bottlenose dolphins fed mainly on snake blennyOphidion barbatum(34%), bogueBoops boops(22%) and round sardinellaSardinella aurita(13%); common dolphins on round sardinella (17%), picarelsSpicaraspp. (10%) and Cocco's lantern fishLobianchia gemellaris(9%); harbour porpoises on Gobidae (four-spotted gobyDeltentosteus quadrimaculatus41% and black gobyGobius niger37%) and round sardinella (7%); striped dolphins on Myctophydae (Madeira lantern fishCeratoscopelus maderensis51%), and on Pfeffer's enople squidAbraliopsis morisii(10%) and bogue (8%); and Risso's dolphin exclusively on Teuthidae (31%), the umbrella squidHistioteuthis bonellii(30%) and the reverse jewel squidH. reversa(14%). The present work represents the first attempt to investigate the diet up to species level for several cetaceans in Greek waters and for harbour porpoises stranded in the Mediterranean Sea.

Geodetic analysis of the tectonic crustal deformation pattern in the North Aegean Sea, Greece

2021 ◽  
Author(s):  
Ilias Lazos ◽  
Sotirios Sboras ◽  
Christos Pikridas ◽  
Spyros Pavlides ◽  
Alexandros Chatzipetros
Keyword(s):  
Crustal Deformation ◽  
Aegean Sea ◽  
Deformation Pattern ◽  
The North ◽  
North Aegean ◽  
North Aegean Sea

scholarly journals Age and Growth of Red Porgy, Pagrus pagrus from the Island of Gökçeada, North Aegean Sea

2020 ◽  
Vol 35 (2) ◽  
pp. 57-63
Author(s):  
Hakan Ayyıldız ◽  
Aytaç Altın ◽  
Bayram Kızılkaya
Keyword(s):  
Aegean Sea ◽  
Age And Growth ◽  
Red Porgy ◽  
North Aegean ◽  
North Aegean Sea ◽  
Pagrus Pagrus

scholarly journals A three dimensional, full life cycle, anchovy and sardine model for the North Aegean Sea (Eastern Mediterranean): Validation, sensitivity and climatic scenario simulations

2021 ◽  
Vol 22 (3) ◽  
pp. 653
Author(s):  
ATHANASIOS GKANASOS ◽  
EUDOXIA SCHISMENOU ◽  
KOSTAS TSIARAS ◽  
STYLIANOS SOMARAKIS ◽  
MARIANNA GIANNOULAKI ◽  
...  
Keyword(s):  
Temperature Increase ◽  
Eastern Mediterranean ◽  
Larval Growth ◽  
Somatic Growth ◽  
Aegean Sea ◽  
Fish Growth ◽  
Prey Concentration ◽  
The North ◽  
North Aegean ◽  
North Aegean Sea

We present the development of a 3D full-lifecycle, individual-based model (IBM) for anchovy and sardine, online coupled to an existing hydrodynamic/biogeochemical low-trophic level (LTL) model for the North Aegean Sea. It was built upon an existing 1D model for the same species and area, with the addition of a horizontal movement scheme. In the model, both species evolve from the embryonic stage (egg+yolk sac larva) to the larval, juvenile, and adult stages. Somatic growth is simulated with the use of a “Wisconsin” type bioenergetics model and fish populations with an adaptation of the ‘super individuals’ (SI) approach. For the reference simulation and model calibration, in terms of fish growth and population biomass, the 2000-2010 period was selected. Interannual biomass variability of anchovy was successfully represented by the model, while the simulated biomass of sardine exhibited low variability and did not satisfactorily reproduce the observed interannual variability from acoustic surveys. The spatial distribution of both species’ biomass was in relatively good agreement with field data. Additional single-species simulations revealed that species compete for food resources. Temperature sensitivity experiments showed that both species reacted negatively to a temperature increase. Anchovy, in particular, was more affected since its spawning and larval growth periods largely overlap with the period of maximum yearly temperature and low prey concentration. Finally, simulation experiments using IPCC climatic scenarios showed that the predicted temperature increase and zooplankton concentration decrease in the future will negatively affect anchovy, resulting in sardine prevalence.

scholarly journals The Confirmed Occurence of Serpent Eel Ophisurus serpens in Saros Bay (Northern Agean Sea), Turkey

2020 ◽  
Vol 78 (3) ◽  
pp. 157-164
Author(s):  
Sezginer Tuncer ◽  
Hatice Torcu Koç ◽  
Aytuğ Zilifli
Keyword(s):  
Aegean Sea ◽  
Mature Female ◽  
Female Specimen ◽  
Meristic Characters ◽  
Long Line ◽  
North Aegean ◽  
Biological Characters ◽  
North Aegean Sea ◽  
Taxonomic Studies

AbstractOne mature female specimen of serpent eel Ophisurus serpens (Linnaeus, 1758) was caught by long line by a professional fisherman at a depth of about 45 m from Ece Bight, Saros Bay, north Aegean Sea on 15 February 2016. The species was previously reported without any morphometric and meristic characters from Saros Bay. Some biological characters, such as age and diameters of otolith and oocytes, are also given. In this study, the detailed morphomeristic features, which can contribute to the taxonomic studies of serpent eel from Turkish Seas, are presented.

Sign in / Sign up

Export Citation Format

Share Document