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

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

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315405011203h ◽

2005 ◽

Vol 85 (2) ◽

pp. 313-321 ◽

Cited By ~ 15

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.

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Distribution and Diversity of Sulfur-OxidizingThiomicrospira spp. at a Shallow-Water Hydrothermal Vent in the Aegean Sea (Milos, Greece)

Applied and Environmental Microbiology ◽

10.1128/aem.65.9.3843-3849.1999 ◽

1999 ◽

Vol 65 (9) ◽

pp. 3843-3849 ◽

Cited By ~ 53

Author(s):

Thorsten Brinkhoff ◽

Stefan M. Sievert ◽

Jan Kuever ◽

Gerard Muyzer

Keyword(s):

Phylogenetic Analysis ◽

Shallow Water ◽

Hydrothermal Vent ◽

Denaturing Gradient Gel Electrophoresis ◽

Aegean Sea ◽

Horizontal Distribution ◽

Most Probable Number ◽

Probable Number ◽

Gradient Gel Electrophoresis ◽

Sulfur Oxidizing

ABSTRACT A shallow-water hydrothermal vent system in the Aegean Sea close to the island of Milos (Greece) was chosen to study the diversity and distribution of the chemolithoautotrophic sulfur-oxidizing bacteriumThiomicrospira. Cell numbers in samples from different regions around a solitary vent decreased toward the center of the vent (horizontal distribution), as well as with depth (vertical distribution), corresponding to an increase in temperature (from ca. 25 to 60°C) and a decrease in pH (from ca. pH 7 to 5).Thiomicrospira was one of the most abundant culturable sulfur oxidizers and was even dominant in one region. Phylogenetic analysis of Thiomicrospira spp. present in the highest most-probable-number (MPN) dilutions revealed that most of the obtained sequences grouped in two new closely related clusters within theThiomicrospira branch. Two different new isolates, i.e., Milos-T1 and Milos-T2, were obtained from high-dilution (10−5) enrichments. Phylogenetic analysis indicated that isolate Milos-T1 is related to the recently describedThiomicrospira kuenenii and Hydrogenovibrio marinus, whereas isolate Milos-T2 grouped with the MPN sequences of cluster 2. The predominance of strain Milos-T2 was indicated by its identification in several environmental samples by hybridization analysis of denaturing gradient gel electrophoresis (DGGE) patterns and by sequencing of one of the corresponding bands, i.e., ML-1, from the DGGE gel. The results shown in this paper support earlier indications that Thiomicrospira species are important members of hydrothermal vent communities.

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Halothiobacillus kellyi sp. nov., a mesophilic, obligately chemolithoautotrophic, sulfur-oxidizing bacterium isolated from a shallow-water hydrothermal vent in the Aegean Sea, and emended description of the genus Halothiobacillus.

INTERNATIONAL JOURNAL OF SYSTEMATIC AND EVOLUTIONARY MICROBIOLOGY ◽

10.1099/00207713-50-3-1229 ◽

2000 ◽

Vol 50 (3) ◽

pp. 1229-1237 ◽

Cited By ~ 64

Author(s):

S M Sievert ◽

T Heidorn ◽

J Kuever

Keyword(s):

Shallow Water ◽

Hydrothermal Vent ◽

Aegean Sea ◽

Emended Description ◽

Sulfur Oxidizing

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

Journal of the Marine Biological Association of the United Kingdom ◽

10.1017/s0025315403007732h ◽

2003 ◽

Vol 83 (4) ◽

pp. 737-745 ◽

Cited By ~ 8

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.

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