02438nas a2200157 4500008004100000245018500041210006900226300001300295490000800308520178000316653000902096100001702105700001602122700001402138856012802152 1997 eng d00aField distribution and sulphide tolerance of Capitella capitata (Annelida: Polychaeta) around shallow water hydrothermal vents off Milos (Aegean Sea): A new sibling species?0 aField distribution and sulphide tolerance of iCapitella capitata a447-453.0 v1303 a The cosmopolitan polychaete Capitella capitata, known as a complex of opportunistic sibling species, usually dominates the acrobenthos of polluted or unpredictable environments. A population of C. capitata, termed Capitella sp. M, was found in a shallow water hydrothermal vent area south of Milos (Greece). Here, this population occurs close to vent outlets (termed the "transition zone"), an environment with steep gradients of temperature, salinity and pH and increased sulphide concentrations of up to 710 mu-M. The field distribution of C. capitata in relation to sulphide concentrations around the vent outlets was investigated and sulphide tolerance experiments were conducted on laboratory-cultured worms to elucidate possible adaptations of Capitella sp. M to these extreme environmental conditions. In order to investigate whether the population from the Milos hydrothermal vent area can be considered a distinct sibling species within the C. capitata complex, crossbreeding experiments and analysis of general protein patterns were conducted with Capitella sp. M and three other C. capitata populations of different ecological ranges. Capitella sp. M showed high resistance (median survival time: 107 +- 38 h) to anoxia plus high sulphide concentrations of 740 mu-M. It seems that the ability to survive high-sulphide conditions in combination with reduced interspecific competition enables the olychaete to maintain a continuous population in this rigorous habitat. From the extremely high tolerance to anoxia and sulphide, shown in both the crossbreeding experiments and the analysis of total proteins, it can be concluded that Capitella sp. M from the Milos hydrothermal vent area represents a separate sibling species within the C. capitala complex.10aKAPE1 aGamenick, I.1 aAbbiati, M.1 aGiere, O. uhttps://icgf.myspecies.info/content/field-distribution-and-sulphide-tolerance-capitella-capitata-annelida-polychaeta-around02430nas a2200157 4500008004100000245018500041210006900226260001200295300001200307490000800319520176800327100001702095700001602112700001402128856013002142 1998 eng d00aField distribution and sulphide tolerance of Capitella capitata (Annelida: Polychaeta) around shallow water hydrothermal vents off Milos (Aegean Sea). A new sibling species?0 aField distribution and sulphide tolerance of iCapitella capitata c1998/// a447-4530 v1303 aThe cosmopolitan polychaete Capitella capitata, known as a complex of opportunistic sibling species, usually dominates the macrobenthos of polluted or unpredictable environments. A population of C. capitara, termed Capitella sp. M, was found in a shallow water hydrothermal vent area south of Milos (Greece). Here, this population occurs close to vent outlets (termed the 'transition zone'), an environment with steep gradients of temperature, salinity and pH and increased sulphide concentrations of up to 710 ìM. The field distribution of C. capitata in relation to sulphide concentrations around the vent outlets was investigated and sulphide tolerance experiments were conducted on laboratory-cultured worms to elucidate possible adaptations of Capitella sp. M to these extreme environmental conditions. In order to investigate whether the population from the Milos hydrothermal vent area can be considered a distinct sibling species within the C. capitata complex, crossbreeding experiments and analysis of general protein patterns were conducted with Capitella sp. M and three other C. capitata populations of different ecological ranges. Capitella sp. M showed high resistance (median survival time: 107 ±38 h) to anoxia plus high sulphide concentrations of 740 ìM. It seems that the ability to survive high-sulphide conditions in combination with reduced interspecific competition enables the polychaete to maintain a continuous population in this rigorous habitat. From the extremely high tolerance to anoxia and sulphide, shown in both the crossbreeding experiments and the analysis of total proteins, it can be concluded that Capitella sp. M from the Milos hydrothermal vent area represents a separate sibling species within the C. capitata complex.1 aGamenick, I.1 aAbbiati, M.1 aGiere, O. uhttps://icgf.myspecies.info/content/field-distribution-and-sulphide-tolerance-capitella-capitata-annelida-polychaeta-around-003225nas a2200181 4500008004100000245009900041210006900140260001200209300001200221490000800233520252200241653009102763100001802854700002002872700001702892700001402909856012002923 1997 eng d00aBenthic fauna of a shallow-water gaseohydrothermal vent area in the Aegean Sea (Milos, Greece)0 aBenthic fauna of a shallowwater gaseohydrothermal vent area in t c1997/// a149-1590 v1283 aThe benthic community of shallow-water hydrothermal vents (10 m water depth) in a sandy bay on the south coast of Milos, Greece was studied. The macro- and meiofauna, as well as environmental factors such as temperature, salinity, sulfide concentration, grain size composition, ATP concentration, organic carbon, chlorophyll a and phacopigments were evaluated. Samples were taken along transects from a seagrass meadow into a hydrothermally active area. Hydrothermally active spots were distinguished from the surrounding sediment by their black sediment coloration and an overlying white bacterial mat. For comparison, a control transect from a seagrass meadow into bare sand in a non-vent area in the same bay was studied. Overall, we found decreasing faunal diversity from the seagrass bed towards the hydrothermally active area. Along this gradient, four different zones could be distinguished. (a) The seagrass area had a relatively low diversity compared to the control stations, but much higher diversity than in the areas directly influenced by hydrothermal activity. (b) The border zone between the seagrass and the hydrothermal area, with moderate sulfide concentrations, pH values, seawater salinity and temperatures, was inhabited by an impoverished community dominated by the polychaete Capitella capitata, the nematodes Oncholaimus campylocercoides and Sabatieria sp., and an as yet undescribed chromadorid nematode (Chromadorina sp.). (c) The transition zone at the border of the hydrothermal area proper, with temperatures and sulfide concentrations higher than in the border zone, was characterized by high salinity (60?) and low pH values. Along with the gastropod Cyclope neritea, single specimens of C. capitata and O. campylocercoides occurred. (d) The hydrothermal area proper, characterized by high sulfide concentrations, had high sediment temperatures and high salinities. The pH was as low as 6. Here, the gastropod Cyclope neritea was the only species occurring in considerable numbers. The gaseohydrothermal activity seems to largely exclude the surrounding farina in a graded zonal pattern. The increasing hydrothermal stress entrains a change of the ambient biota towards a depauperate consortium of tolerant, opportunistic species, e.g. Capitella capitata (Polychaeta) and Oncholaimus campylocercoides (Nematoda). Although the hydrothermal area proper was characterized by a thick bacterial mat, the benthic community was characterized not by bacteria feeders but by scavenging species.10akape Annelida Polychaeta Nematoda Mollusca Gastropoda Oligochaeta Crustacea Tanaidacea1 aThiermann, F.1 aAkoumianaki, I.1 aHughes, J.A.1 aGiere, O. uhttps://icgf.myspecies.info/content/benthic-fauna-shallow-water-gaseohydrothermal-vent-area-aegean-sea-milos-greece00592nas a2200145 4500008004100000245012200041210006900163300001200232490000800244653001800252100001800270700001600288700001400304856012800318 2000 eng d00aSulphide tolerance of the marine nematode Oncholaimus campylocercoides-a result of internal sulphur formation?0 aSulphide tolerance of the marine nematode iOncholaimus campyloce a251-2590 v19310aKAPE Nematoda1 aThiermann, F.1 aVismann, B.1 aGiere, O. uhttps://icgf.myspecies.info/content/sulphide-tolerance-marine-nematode-oncholaimus-campylocercoides-result-internal-sulphur02360nas a2200157 4500008004100000245012300041210006900164300001200233490000700245520171100252653006201963100001802025700001802043700001402061856012702075 1994 eng d00aSelected meiofauna around shallow water hydrothermal vents off Milos (Greece): Ecological and ultrastructural aspects.0 aSelected meiofauna around shallow water hydrothermal vents off M a215-2260 v443 aGaseous emissions, caused by volcanic activity, occur in Paleohori Bay at the south coast of Milos (Aegean Sea, Greece). In June 1992 meiofauna was collected by SCUBA diving in a seep field in sandy sediments at 5-10 m water depth. Within an active vent area (site 1), the sediment temperatures ranged from 55-97 degree C and the sulfide concentrations were about 1000 mu-M. At the fringe of the area. temperatures decreased (25-30 degree C) as well as sulfide values (10-50 mu-M). Outside the active area. not directly influenced by the venting. the sediment temperature ranged between 20.0-20.7 degree C and no sulfide was detected. The sediment in direct vicinity of the emissions was devoid of meiofauna. Meiobenthic life was present only at a certain distance from the emissions at moderate temperature and sulfide conditions. Evaluating three transects from two sites it became apparent that meiofauna differed between the seeps, but also between seep and non-seep stations. This differentiated faunal distribution rendered generalizations of the seep meiofauna problematical. Overall, the meiofauna community was relatively poor consisting primarily of nematodes and a few harpacticoid copepods, turbellarians and ciliates. In the sulfidic sediments, meiofauna was dominated by some characteristic nematodes. The most frequent one, Oncholaimus campylocercoides (Oncholaimidae), occurred in abundances up to 300 ind./100 cm-3. Therefore, this characteristic species was selected for more detailed studies on structural adaptations to this hostile environment. Two different types of intracellular inclusions were found. Their possible function as sulfide detoxification mechanisms is discussed.10akape Nematoda Crustacea Copepoda Platyhelminthes Protozoa1 aThiermann, F.1 aWindoffer, R.1 aGiere, O. uhttps://icgf.myspecies.info/content/selected-meiofauna-around-shallow-water-hydrothermal-vents-milos-greece-ecological-and