scholarly journals Recovery of the commercial sponges in the central and southeastern Aegean Sea (NE Mediterranean) after an outbreak of sponge disease

2011 ◽  
Vol 12 (1) ◽  
pp. 5 ◽  
Author(s):  
J. CASTRITSI-CATHARIOS ◽  
H. MILIOU ◽  
K. KAPIRIS ◽  
E. KEFALAS
Keyword(s):  
Multivariate Analysis ◽  
Aegean Sea ◽  
Coastal Areas ◽  
Hydrographic Conditions ◽  
Sponge Disease ◽  
Ne Mediterranean ◽  
Percentage Abundance ◽  
Spongia Officinalis ◽  
Cretan Sea

The distribution and biometry of commercial sponges (Porifera) in coastal areas of the central and southeastern Aegean Sea was investigated to estimate the recovery progress of the populations eight years after the first appearance of sponge disease. Signs of the disease were detected only in 1.6% of the harvested sponges. Multivariate analysis on the percentage abundance of sponges showed two distinct groups among the sixteen fishing grounds studied: the eight deep (50-110 m) and the eight shallow ones (<40 m). The group from the deep depths consisted of Spongia officinalis adriatica, S. agaricina and S. zimocca. The infralittoral zone was characterized by the presence of Hippospongia communis, S. officinalis adriatica and S. officinalis mollissima. These bath sponges showed an enhanced abundance in the eastern Cretan Sea (S. Aegean Sea). In addition, their dimensions, particularly height, increased with increasing depth. It is indicated that the hydrographic conditions prevailing in the eastern Cretan Sea affected the repopulating processes of sponge banks. In each species, the biometric characteristics of the experimental specimens were similar to those of the sponges found in the market and harvested at respective depths prior to the appearance of sponge disease.

scholarly journals THE IMPORTANCE OF BENTHIC FORAMINIFERASIN DETECTING FEATURES OF ECOLOGICAL AND GEOLOGICAL STRUCTURES IN EDREMIT BAY AND ON COASTAL AREAS OF DİKİLİ CHANNEL (NE AEGEAN SEA)

2014 ◽  
Vol 148 (148) ◽  
Author(s):  
Engin MERİÇ ◽  
Niyazi AVŞAR ◽  
İpek F. BARUT ◽  
Mustafa ERYILMAZ ◽  
Fulya YÜCESOY ERYILMAZ ◽  
...  
Keyword(s):  
Aegean Sea ◽  
Coastal Areas ◽  
Geological Structures

Growth and feeding patterns of European anchovy (Engraulis encrasicolus) early life stages in the Aegean Sea (NE Mediterranean)

2010 ◽  
Vol 86 (2) ◽  
pp. 299-312 ◽  
Author(s):  
Ignacio A. Catalán ◽  
Arild Folkvord ◽  
Isabel Palomera ◽  
Gemma Quílez-Badía ◽  
Fotini Kallianoti ◽  
...  
Keyword(s):  
Early Life ◽  
Aegean Sea ◽  
Life Stages ◽  
Early Life Stages ◽  
Feeding Patterns ◽  
European Anchovy ◽  
Engraulis Encrasicolus ◽  
Ne Mediterranean ◽  
European Anchovy Engraulis Encrasicolus

scholarly journals Coccolithophore assemblage response to Black Sea Water inflow into the North Aegean Sea (NE Mediterranean)

2017 ◽  
Vol 149 ◽  
pp. 138-150 ◽  
Author(s):  
B.-Th. Karatsolis ◽  
M.V. Triantaphyllou ◽  
M.D. Dimiza ◽  
E. Malinverno ◽  
A. Lagaria ◽  
...  
Keyword(s):  
Black Sea ◽  
Sea Water ◽  
Aegean Sea ◽  
Water Inflow ◽  
The North ◽  
North Aegean ◽  
Ne Mediterranean ◽  
North Aegean Sea

scholarly journals Grazing effect of flagellates on bacteria in response to phosphate addition in the oligotrophic Cretan Sea, NE Mediterranean

2020 ◽  
Vol 96 (6) ◽  
Author(s):  
Andreas Oikonomou ◽  
Eleni Livanou ◽  
Manolis Mandalakis ◽  
Anna Lagaria ◽  
Stella Psarra
Keyword(s):  
Grazing Rate ◽  
P Availability ◽  
Pigment Analysis ◽  
Planktonic Food ◽  
Grazing Effect ◽  
Bacterial Removal ◽  
Negative Effect ◽  
Ne Mediterranean ◽  
P Addition ◽  
Cretan Sea

ABSTRACT The planktonic food web in the oligotrophic Mediterranean Sea is dominated by small-sized (&lt;20 μm) microbes, with nanoflagellates being the major bacterial grazers and the main participants in nutrient cycling. Phosphate is a key nutrient in the P-limited Cretan Sea (NE Mediterranean) and P-availability can affect its trophic dynamics. Here, we examined the grazing potential of heterotrophic (HF) and pigmented (PF) nanoflagellates as a response mechanism to phosphate amendment. Flagellate grazing effect on bacteria was quantified in P-amended nutrient-depleted water from the Cretan Sea over the course of 4 days using microcosm experiments. P-addition positively affected HF abundance, while PF abundance remained unchanged. At the community level, P-addition had a negative effect on PF bacterial removal rates. In the control, PF-grazing rate was significantly higher than that of HF throughout the experiment. Pigment analysis showed no changes in phytoplankton community composition as a result of P-addition, indicating that PF grazing rate declined as a physiological response of the cells. The present study emphasizes the dominant grazing role of PF under P-depleted conditions and reveals that during the late stratified season PF respond to P-addition by lowering their grazing rates, enhancing the relative importance of bacterial removal by HF.

scholarly journals The impacts of scallop dredging on sponge assemblages in the Gulf of Kalloni (Aegean Sea, northeastern Mediterranean)

2003 ◽  
Vol 60 (2) ◽  
pp. 402-410 ◽  
Author(s):  
E Kefalas ◽  
J Castritsi-Catharios ◽  
H Miliou
Keyword(s):  
Multivariate Analysis ◽  
Fishery Management ◽  
Aegean Sea ◽  
Significant Loss ◽  
Sponge Species ◽  
Time Interval ◽  
Suberites Domuncula ◽  
Abundance Data ◽  
Cliona Celata ◽  
The Impact

Abstract Concerns have been raised on the impact of bottom-fishing activities in the shallow Gulf of Kalloni (Lesvos Island, Aegean Sea). Fishing with demersal gears was banned in 1995, but the Gulf was reopened in 1998 only for scallop dredging using the “lagamna” gear. Two series of samplings were done with this gear in 1998 and 1999 (October) before the beginning of scallop-fishing period (from November up to March), aiming to investigate possible changes in sponge assemblages. Sponges (Porifera) were the most abundant meso-megafaunal benthic organisms in the Gulf, besides scallops and other bivalves. Total abundance, number of species, species diversity, species richness and evenness of sponge assemblages reduced significantly from the year 1998 to 1999. The population of the excavating Cliona celata, the only infaunal sponge species found in the Gulf, decreased. Multivariate analysis on the abundance data of epibenthic sponge species revealed a clear separation of samples collected during the 2 years, indicating changes in the structure of sponge assemblages. The distinguishing species included a variety of growth forms: massive (Mycale massa, Suberites domuncula and Tethya citrina), lobose (Suberites massa, Tedania anhelans and Halichondria panicea), erect branching (Raspailia viminalis), encrusting (Crambe crambe) and cushion-shaped (Mycale contarenii and Chondrilla nuculla) sponges. Among these species, only S. massa increased its abundance in 1999. All others decreased. No significant loss of information occurred when multivariate analysis was applied to abundance data of genera or families. This comparative study demonstrated that the time interval between two consecutive scallop-fishing periods was insufficient for the recovery of sponge assemblages. It is concluded that scallop dredging causes long-term changes in the structure and biodiversity of sponge assemblages in the Gulf of Kalloni. An improved strategy of fishery management is required in future for the conservation of living resources in this Gulf.

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