Ecological features of Syllidae (Polychaeta) from shallow-water benthic environments of the Aegean Sea, eastern Mediterranean

2003 ◽  
Vol 83 (4) ◽  
pp. 737-745 ◽  
Author(s):  
Melih Ertan Çinar
Keyword(s):  
Shallow Water ◽  
Eastern Mediterranean ◽  
Similarity Index ◽  
Aegean Sea ◽  
Posidonia Oceanica ◽  
Multivariate Statistical ◽  
Bare Sand ◽  
Ecological Features ◽  
Index Value ◽  
High Consistency

Ecological features of Syllidae inhabiting shallow-water benthic habitats of the Aegean Sea were analysed by utilizing some univariate and multivariate statistical methods. A total of 121 benthic materials collected in a variety of substrata and depths (0–76 m) contained 90 syllid species belonging to the four subfamilies Autolytinae, Exogoninae, Eusyllinae and Syllinae. Among the subfamilies, Syllinae were characterized by a high number of species and Exogoninae by a high number of individuals. Although dominant species varied according to substrata, the two species, Grubeosyllis clavata and Syllis prolifera, accounted for up to 51% of the total syllid populations in the area. Among the biotopes sampled, Posidonia oceanica seems to be particularly suitable for the settlement of syllid species, whereas bare sand and mud harbour only a few species, mainly Exogoninae. The cluster- and ordination analyses detected species associations on soft and hard substrata, and suggested that syllid assemblages are strongly affected by the habitat structure. Species compositions associated with algae appear to be related to complexity of the algae, so that the ones with relatively small thalli, such as Padina pavonica and Halopteris spp., constituted a group with a high similarity-index value. Samples of Posidonia oceanica collected at different stations showed a high consistency in terms of syllid assemblages.

Lessepsian migrants expanding their distributional ranges; Pseudonereis anomala (Polychaeta: Nereididae) in Izmir Bay (Aegean Sea)

2005 ◽  
Vol 85 (2) ◽  
pp. 313-321 ◽  
Author(s):  
Melih Ertan Çinar ◽  
Zeki Ergen
Keyword(s):  
Shallow Water ◽  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Hard Substratum ◽  
Izmir Bay ◽  
Lessepsian Migrants

A total of ten specimens of Pseudonereis anomala (Polychaeta: Nereididae) were collected on the shallow water hard substratum (0·2 m) at four stations located in the inner part of Izmir Bay (Aegean Sea, eastern Mediterranean) in January 2004. The absence of this species among the material collected previously at the same stations might suggest that it has recently become established in the area. A re-description of the species together with its ecological, reproductive, feeding and distributional aspects are provided.

Soft-bottom sipunculans in Izmir Bay (Aegean Sea, eastern Mediterranean)

Zootaxa ◽  
2009 ◽  
Vol 2136 (1) ◽  
pp. 40-48 ◽  
Author(s):  
SERMIN AÇIK
Keyword(s):  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Posidonia Oceanica ◽  
Soft Bottom ◽  
Muddy Sand ◽  
Izmir Bay ◽  
Ecological Characteristics

This paper deals with the sipunculan species distributed in Izmir Bay (Aegean Sea, eastern Mediterranean). Benthic samples were taken at 29 stations between 1998 and 2001 at depths ranging from 8 to 77 m. Six species and 200 individuals belonging to three families were found. Aspidosiphon (A.) mexicanus is newly recorded from Izmir Bay. The majority of specimens were found on a sandy-mud substratum (42%), followed by sand (35%), muddy-sand (19%) and sand (3%), respectively. Among the habitats, Posidonia oceanica and muddy-sand were represented by the highest numbers of species (4 species), followed by sandy-mud (3 species), and sand (2 species). The densities of the species at sampling stations were determined and compared seasonally, based on the data collected in 2001. Brief descriptions of the species and their distributional, reproductive and ecological characteristics are given.

First records of six species of crustaceans for the eastern Mediterranean Sea

Crustaceana ◽  
2019 ◽  
Vol 92 (11-12) ◽  
pp. 1403-1414
Author(s):  
Ozge Ozgen ◽  
Sermin Acik ◽  
Kerem Bakir
Keyword(s):  
Mediterranean Sea ◽  
New Record ◽  
New Records ◽  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Posidonia Oceanica ◽  
The Other ◽  
Eastern Mediterranean Sea ◽  
Crustacean Species ◽  
Ecological Characteristics

Abstract This paper deals with six crustacean species associated with Posidonia oceanica (Linnaeus) Delile, 1813 meadows along the Aegean coasts of Turkey: Caprella tavolarensis, Eriopisella ruffoi, Iphimedia vicina, Astacilla mediterranea, Apseudopsis minimus and Macropodia deflexa. Apseudopsis minimus is a new record for the Turkish coast of the Aegean Sea, the other five species are new records for the eastern Mediterranean. Brief descriptions of the species and their morphological and ecological characteristics are given.

Eco-geochemical dynamics of a shallow-water hydrothermal vent system at Milos Island, Aegean Sea (Eastern Mediterranean)

2013 ◽  
Vol 356 ◽  
pp. 11-20 ◽  
Author(s):  
Mustafa Yücel ◽  
Stefan M. Sievert ◽  
Costantino Vetriani ◽  
Dionysis I. Foustoukos ◽  
Donato Giovannelli ◽  
...  
Keyword(s):  
Shallow Water ◽  
Hydrothermal Vent ◽  
Eastern Mediterranean ◽  
Aegean Sea

scholarly journals First record of the isopod Idotea hectica (Pallas, 1772) (Idoteidae) and of the brachyuran crab Matuta victor (Fabricius, 1781) (Matutidae) in the Hellenic waters

2018 ◽  
Vol 19 (3) ◽  
pp. 656 ◽  
Author(s):  
GERASIMOS KONDYLATOS ◽  
MARIA CORSINI-FOKA ◽  
EMMANOUIL PERAKIS
Keyword(s):  
Eastern Mediterranean ◽  
Aegean Sea ◽  
First Record ◽  
Posidonia Oceanica ◽  
Single Specimen ◽  
Brachyuran Crab ◽  
Westward Expansion ◽  
First Time

The presence and the establishment of Idotea hectica is reported for the first time in the Hellenic seas on the basis of three adult specimens and a juvenile collected from Posidonia oceanica meadows close to the main town of Rhodes Island, Aegean Sea. Common and contrasting characters between this and other species of the genera Idotea and Pentidotea are briefly discussed. Furthermore, following a westward expansion along the eastern Mediterranean coasts, Matuta victor was discovered for the first time in Hellenic waters on the basis of a single specimen from the northeast of Rhodes Island.

scholarly journals Effectiveness of Posidonia oceanica biotic indices for assessing the ecological status of coastal waters in Saronikos Gulf (Aegean Sea, Eastern Mediterranean)

2017 ◽  
Vol 18 (1) ◽  
pp. 161 ◽  
Author(s):  
V. GERAKARIS ◽  
P. PANAYOTIDIS ◽  
S. VIZZINI ◽  
A. NICOLAIDOU ◽  
A. ECONOMOU-AMILLI
Keyword(s):  
Coastal Waters ◽  
Eastern Mediterranean ◽  
Spatial Scales ◽  
Ecological Status ◽  
Aegean Sea ◽  
Posidonia Oceanica ◽  
Assessment Tools ◽  
Biotic Indices ◽  
Cumulative Impact ◽  
Nested Analysis

Biotic indices are considered key assessment tools in most national and European policies aimed at improving the quality of coastal waters. At present, several Water Framework Directive (WFD)-compliant biotic indices based on the marine angiosperm Posidonia oceanica have been developed and applied in the Mediterranean Sea. In this study, we investigated the effectiveness of four different P. oceanica indices (POMI, PREI, Valencian CS, and BiPo) in evaluating the ecological status of coastal waters in a case study area of Greece. The evaluation, comparison, and validation of the Ecological Status Class (ESC) assessments obtained by each index were based on a set of eight common sites that encompasses the maximum range of environmental quality in the study area. Four sampling sites separated by tens of km were chosen in each of the two water bodies (WBs) studied. The spatial variations of the features of P. oceanica meadows were examined according to a hierarchical sampling design across four spatial scales, ranging from metres to tens of km, using independent nested analysis of variance. Except for the BiPo index, the reference values for each metric/index were defined by the dataset available for the study area. All biotic indices classified the WBs of the study area in Good ESC category. Only three of the four indices (PREI, Valencian CS, and BiPo) showed high comparability in the assessment of ESC at study site level. It is assumed that the differences found in the remaining index (POMI) are due to the different type of metrics taken into consideration and the different weighting given to them. Our findings suggest that all indices can provide an overall view of the cumulative impact of multiple environmental stressors existing in the study area, and can thus help raise awareness of ecosystem degradation.

scholarly journals Peracarida populations of hard substrate assemblages in ports of the NW Aegean Sea (eastern Mediterranean)

2004 ◽  
Vol 58 (1) ◽  
pp. 54-61 ◽  
Author(s):  
C.-C. Chintiroglou ◽  
C. Antoniadou ◽  
A. Baxevanis ◽  
P. Damianidis ◽  
P. Karalis ◽  
...  
Keyword(s):  
Eastern Mediterranean ◽  
Aegean Sea ◽  
Hard Substrate

Vegetation dynamics of the eastern Mediterranean region during the Holocene

2021 ◽  
Author(s):  
Esmeralda Cruz-Silva ◽  
Sandy P. Harrison ◽  
Elena Marinova ◽  
I. Colin Prentice
Keyword(s):  
Mediterranean Region ◽  
Likelihood Function ◽  
Eastern Mediterranean ◽  
Regional Scale ◽  
Eastern Mediterranean Region ◽  
Similarity Index ◽  
Vegetation Changes ◽  
Human Occupation ◽  
The Holocene ◽  
Atmospheric Circulation Patterns

<p>The circum-Mediterranean region is characterized by high climatic diversity derived from its orographic heterogeneity and the influence of global marine and atmospheric circulation patterns. The region also has a long and dynamic history of human occupation dating back to ~ 8000 years BP.  The complexity of this area is a challenge for reconstructing the dynamics of the vegetation through the Holocene. Rule-based approaches to reconstructing changing vegetation patterns through time are insufficient as they require the imposition of subjective boundaries between biomes and can be affected by known biases in pollen representation.  We have developed and tested a new method that characterises biomes as a function of observed pollen assemblages based on a similarity index, conceptually related to the likelihood function, which takes account of within-biome variability in taxon abundances. We use 1181 modern pollen samples from the EMBSeCBIO database and assign these samples to biomes as represented in a map of potential natural vegetation that was developed using machine learning. The method was applied down-core to reconstruct past vegetation changes. Preliminary results show that this new methodology produces more accurate biome assignments under modern conditions (<80% accuracy) and more stable down-core reconstructions, apparently reducing the "flickering switch" problem found when using the traditional biomisation method for this purpose. Climate-induced vegetation changes are observable on a sub-regional scale in the Eastern Mediterranean through the Holocene. Most of the records show a change from humid to more arid biomes between 4000 and 3000 years BP. However, they are distinct subregional patterns in the expression and timing of wetter conditions during the Holocene. Mountain regions appear to show more muted changes during the Holocene, although there are biome shifts everywhere across the Pleistocene-Holocene transition.</p>

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