18 research outputs found

    Biodiversity of Isopoda and Cumacea (Peracarida, Crustacea) from the Marine Protected Area Namuncur谩-Burdwood Bank, South-West Atlantic

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    Burdwood Bank is a shallow seamount located south of the Malvinas (Falkland) Islands and east of Tierra del Fuego. In 2013, the area down to 200 m depth of this bank was declared the first open-sea (non-coastal) Marine Protected Area (MPA) in Argentina, and named ?Namuncur谩? (MPAN-BB). The present study aimed to evaluate the biodiversity of the isopods and cumaceans from the MPAN-BB. The studied material was collected on board the Argentine RV Puerto Deseado during the Campa帽a Ant谩rtica de Verano 2013. Three stations from the MPAN-BB, respectively located in the core, buffer and transition sectors, were sampled. A total of 17,076 specimens were sorted and 70 taxa distributed in 22 families were identified. Thirty-five new records of distribution and eight species most probably new to science are herein reported. Paramunnidae and Diastylidae were the most abundant and diverse families among isopods and cumaceans, respectively. Our records, together with those obtained from the literature, make a total of 55 nominal species so far known from Burdwood Bank. Except for one nominal species, which had been reported from the Puerto Rico Trench and the Argentine Basin, all the remaining species had also been recorded from other localities within the Magellan Region. In contrast, only nine out of the 55 nominal species had also been reported from the Antarctic Peninsula and/or Scotia Arc. This indicates that the isopods and cumaceans from Burdwood Bank are typically Magellanic, and there is little correspondence between this fauna and that from the Antarctic Peninsula and Scotia Arc.Fil: Doti, Brenda L铆a. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Oficina de Coordinaci贸n Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biolog铆a Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biolog铆a Experimental y Aplicada; ArgentinaFil: Chiesa, Ignacio Luis. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Austral de Investigaciones Cient铆ficas; ArgentinaFil: Roccatagliata, Daniel Carlos. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Oficina de Coordinaci贸n Administrativa Ciudad Universitaria. Instituto de Biodiversidad y Biolog铆a Experimental y Aplicada. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Biodiversidad y Biolog铆a Experimental y Aplicada; Argentin

    Marine invertebrate biodiversity from the Argentine Sea, South Western Atlantic

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    The list of marine invertebrate biodiversity living in the southern tip of South America is compiled. In particular, the living invertebrate organisms, reported in the literature for the Argentine Sea, were checked and summarized covering more than 8,000 km of coastline and marine platform. After an exhaustive literature review, the available information of two centuries of scientific contributions is summarized. Thus, almost 3,100 valid species are currently recognized as living in the Argentine Sea. Part of this dataset was uploaded to the OBIS database, as a product of the Census of Marine Life-NaGISA project. A list of 3,064 valid species, grouped into 1,662 genera distributed in 808 families and 23 phyla, was assessed. The best represented taxa were Arthropoda and Mollusca, contributing approximately with the 50% of the mentioned species in the literature. Cumulative species curves were analyzed in order to estimate the percentage of marine invertebrate biodiversity that is currently known. However, no model fit to our data, showing that the recorded species represent less than 50% of the expected marine invertebrate biodiversity for the Argentine Sea. The great surface of the Argentine Marine Platform (6,581,500 km2) and the relative low effort in collecting and studying new species due to economical restrictions could explain the low fraction of described species. The training of new taxonomists, as well as, the support of projects that contribute to the knowledge of marine invertebrate biodiversity from South Western Atlantic is recommended.Fil: Bigatti, Gregorio. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico Conicet - Centro Nacional Patag贸nico. Instituto de Biolog铆a de Organismos Marinos; ArgentinaFil: Javier Signorelli. Consejo Nacional de Investigaciones Cient铆ficas y T茅cnicas. Centro Cient铆fico Tecnol贸gico Conicet - Centro Nacional Patag贸nico. Instituto de Biolog铆a de Organismos Marinos; Argentin

    Joeropsididae Nordenstam, 1933 (Crustacea, Isopoda, Asellota) from the Lizard Island region of the Great Barrier Reef, Queensland, Australia

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    The marine isopod family Joeropsididae (Asellota) is documented for the Lizard Island region of the Great Barrier Reef, Australia. Fifteen species of Joeropsis are recorded, including ten new species; descriptive notes are provided for five species that lacked adequate material for description. A revised family and genus diagnosis is presented together with comments on the most useful characters for species identification and a key to Joeropsis of the Lizard Island region

    Diversity and Classification of Isopods Crustaceans (Isopoda, Crustacea) Assemblages of Admiralty Bay (King George Island, Antarctic)

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    Skorupiaki z rz臋du r贸wnonog贸w (Isopoda) Latreille, 1817 s膮 wa偶nym elementem zoobentosu morskiego (Gallardo i Castillo 1969; Jazdzewski i in. 1986), i stanowi膮 jedn膮 z najbogatszych w gatunki grup makrozoobentosu Oceanu Po艂udniowego (Clarke i Johnston 2003; De Broyer i in. 2011). Celem pracy by艂a ocena bogactwa gatunkowego r贸wnonog贸w mi臋kkiego dna Zatoki Admiralicji, analiza rozmieszczenia i r贸偶norodno艣ci zgrupowa艅 Isopoda mi臋kkiego dna Zatoki Admiralicji oraz ocena bogactwa gatunkowego i r贸偶norodno艣ci fauny Isopoda aparat贸w czepnych brunatnicy Himantothalls grandifolius. Materia艂 badawczy pochodzi z Zatoki Admiralicji (Wyspy Kr贸la Jerzego) Antarktyka. Do analiz wykorzystano 艂膮cznie 152 pr贸by ilo艣ciowe, jako艣ciowe oraz z aparat贸w czepnych H. grandifolius. Stwierdzono 70 gatunk贸w r贸wnonog贸w z czego 31 gatunk贸w, nie by艂o odnotowanych w tej zatoce. Isopoda nie tworz膮 na mi臋kkim dnie Zatoki Admiralicji wyra藕nych zgrupowa艅 fauny, zwi膮zanych z bardzo ograniczonymi obszarami dna, charakteryzuj膮cymi si臋 bardzo podobnymi parametrami fizyko-chemicznymi. R贸偶norodno艣膰 Isopoda mi臋kkiego dna, w silnie zaburzonej przez lodowce zatoce glacjalnej, by艂a ni偶sza ni偶 w uj艣ciowej cz臋艣ci Fiordu Ezcurry. Aparaty czepne H. grandifolius s膮 zasiedlane przez specyficzne zgrupowanie Isopoda, silnie zdominowane przez Caecognathia antarctica i obecny tylko w tym siedlisku Cymodocella tubicauda. Nie wykazano zale偶no艣ci pomi臋dzy obj臋to艣ci膮 aparatu czepnego H. grandifolius a zag臋szczeniem gatunk贸w, zag臋szczeniem osobnik贸w i liczb膮 gatunk贸w. Zaobserwowano zmiany w strukturze zgrupowa艅 Isopoda pomi臋dzy latami osiemdziesi膮tymi XX wieku, a rokiem 2007. Crustaceans isopod (Isopoda) Latreille, 1817 are an important part of zoobenthos sea (Gallardo and Castillo 1969 JA呕D呕EWSKI et al. 1986), and represent one of the richest in species groups macrozoobenthos of the Southern Ocean (Clarke and Johnston 2003; De Broyer et al. 2011). The aim of the study was to assess species richness Isopoda of soft bottom of Admiralty Bay, analyzing the distribution and diversity Isopoda communieties of soft bottom of Admiralty Bay and evaluation of species richness and diversity of Isopoda fauna of holdfasts of macroalgae Himantothalls grandifolius. The research material comes from Admiralty Bay (King George Island) Antarctica. For the analysis used a total of 152 attempts quantitative, qualitative and holdfast samples of H. grandifolius. It was found 70 species Isopoda, of which 31 species was recorded in this the bay first time. Isopoda not form on the soft bottom of Admiralty Bay distinct groupings fauna associated with very limited areas of the bottom, characterized by very similar physico-chemical parameters. The diversity of the Isopoda soft bottom, in a strongly disturbed by glaciers glacial bay, was lower than in the estuary part of the Ezcurra Inlet. Holdfasts of H. grandifolius are inhabited by specific grouping of the Isopoda, strongly dominated by Caecognathia antarctica and present only in this habitat Cymodocella tubicauda. No significant correlation between the volume of holdfast of H. grandifolius and density of species, density of individuals and number of species. Observed changes in the structure of the Isopoda groupings between the eighties of the twentieth century, and 2007.CAREX Transfer of Knowledge Grant, CeDAMar Short Visit Gran

    A new species of Acanthaspidia Stebbing, 1898 (Isopoda, Asellota, Acanthaspidiidae) from the bathyal Weddell Sea (Southern Ocean)

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    A new acanthaspidiid species, Acanthaspidia matsi sp. nov., is described from the Powell Basin slope (Weddell Sea, Southern Ocean). Specimens of the new species were collected during the expedition ANDEEP III on board RV Polarstern in March 2005. The new species most closely resembles Acanthaspidia typhlops (G. O. Sars, 1879), Acanthaspidia natalensis (Kensley, 1977) andAcanthaspidia bifurcatoides Kussakin & Vasina, 1982, but can be distinguished from all these species by the following characters: rostrum strongly trifid (tips 0.4 times rostrum length); pereonites 1, 3鈥4 and 6 with 2 mid-dorsal spines; pleotelson spinulated, with 2 robust mid-dorsal spines. Systematic difficulties to distinguish the genera Acanthaspidia Stebbing, 1898 and Ianthopsis Beddard, 1886 are discussed and a key to all species in the genus Acanthaspidia is provided

    Macrofaunal assemblages from mud volcanoes in the Gulf of Cadiz

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    Doutoramento em BiologiaDesde a descoberta em 1999 do primeiro vulc茫o de lama no Golfo de C谩dis, cerca de 40 locais, de profundidade vari谩vel entre os 200 e os 3900 m, com diferentes graus de emiss茫o de hidrocarbonetos foram localizados e amostrados dentro do programa IOC-UNESCO 鈥淭raining Through Research (TTR) 鈥 e mais recentemente dentro do projecto europeu HERMES. Neste estudo investigamos as comunidades da macrofauna dos vulc玫es de lama do Golfo de C谩dis utilizando uma diversidade de equipamento de amostragem quantitativo e n茫o quantitativo. Mais de 14550 esp茅cimes foram examinados e inclu铆dos nos diferentes grupos taxon贸micos, sendo fornecida uma lista taxon贸mica detalhada com o menor n铆vel taxon贸mico poss铆vel. A biodiversidade, distribui莽茫o dos principais taxa, as esp茅cies quimiossint茅ticas e a biodiversidade regional e substitui莽茫o de esp茅cies s茫o apresentados e discutidos. Dentro da macrofauna, os bivalves (nomeadamente super-familia Thyasiroidea, esp茅cies quimisimbi贸ticos e comunidade de bivalves) e os ofiurideos s茫o estudados em pormenor. Os Thyasiroidea colhidos nos vulc玫es de lama do Golfo de C谩dis s茫o revistos. Das sete esp茅cies identificadas, apenas uma Thyasira vulcolutre. sp. nov se encontra associada a um ambiente quimiossint茅tico. Esta esp茅cie 茅 restrita a locais activos, mas n茫o se verificam padr玫es de distribui莽茫o para as outras esp茅cies. Os bivalves quimiosimbi贸ticos amostrados s茫o revistos. Das 10 esp茅cies fortemente associadas a ambientes quimiossint茅ticos duas Solemyidae, Petrasma elarraichensis sp. nov. e Acharax gadirae sp. nov., uma Lucinidae, Lucinoma asapheus sp. nov., e uma Vesicomyidae, Isorropodon megadesmus sp. nov. s茫o descritas e comparadas com similares das respectivas fam铆lias. As comunidades de bivalves foram analisadas em detalhe e do estudo de 759 esp茅cimes (49 esp茅cies em 21 familias) descreve-se a diversidade e padr玫es de distribui莽茫o. Os Ophiuroidea amostrados nos vulc玫es de lama e ambientes batiais adjacentes s茫o revistos. Treze esp茅cies s茫o inclu铆das em 4 fam铆lias, Ophiacanthidae, Ophiactidae, Amphiuridae e Ophiuridae e s茫o identificadas, tendo sido descrita uma nova esp茅cie Ophiopristis cadiza sp. nov. R谩cios isot贸picos (未13C, 未15N, 未34S) foram determinados em v谩rias esp茅cies no intuito de investigar a ecologia tr贸fica das comunidades b锚nticas dos vulc玫es do Golfo de C谩dis. Os valores de 未13C para os bivalves Solemyidae, Lucinidae e Thyasiridae est茫o de acordo com os valores para outros bivalves conhecidos por possu铆rem simbiontes tiotr贸ficos. Por outro lado os valores de 未13C e 未34S para Bathymodiolus mauritanicus sugerem a ocorr锚ncia de metanotrofia. A an谩lise da fauna heterotr贸fica indica igualmente que as esp茅cies habitantes da cratera dos vulc玫es de lama derivam a sua nutri莽茫o de fontes quimiossint茅ticas. A indica莽茫o pela an谩lise isot贸pica que as bact茅rias autotr贸ficas contribuem substancialmente para a nutri莽茫o dos bivalves hospedeiros, levou-nos a investigar os endossimbiontes e as suas rela莽玫es filogen茅ticas relativamente a outros bivalves atrav茅s da an谩lise comparativa de an谩lises de sequ锚ncias de 16S ribossomal RNS. An谩lises moleculares PCR-DGGE (Denaturing Gradient Gel Electrophoresis) e clonagem de genes de bacterias 16S rRNA confirmaram a presen莽a de simbiontes oxidantes de enxofre e colocam a possibilidade de uma simbiose dupla para o B. mauritanicus. A diversidade microbiana dentro dos Frenulata foi igualmente estudada recorrendo a m茅todos moleculares e revelou a n茫o exist锚ncia de padr茫o entre esp茅cies, vulc玫es, profundidade e idade do animal sugerindo assim a n茫o procura de simbiontes espec铆ficos.Since the discovery in 1999 of the first mud volcano in the Gulf of Cadiz, about 40 other sites at depths ranging from 200 to 3900m, with varying degrees of hydrocarbon-rich gas seepage activity, have been located and sampled under the IOC-UNESCO Training Through Research (TTR) programme and, more recently, the EU funded HERMES project. In this study we investigate the macrofaunal assemblages from mud volcanoes in the Gulf of Cadiz using a diverse array of quantitative and non-quantitative sampling gear. More than 14550 specimens were examined and ascribed to different taxonomic groups and a detailed taxonomic list with the lowest possible taxonomic level possible at the moment is provided. The biodiversity and distribution of major taxa, the chemosymbiotic species and the regional biodiversity and species turnover are present and discussed. Within macrofauna, bivalves (namely the super-family Thyasiroidea, chemosymbiotic species and bivalves assemblages) and ophiuroids were studied in detail. Thyasiroidea collected from the mud volcanoes of the Gulf of Cadiz are reviewed. Of the seven species identified only one, Thyasira vulcolutre. sp. nov, is closely associated with a chemosynthetic setting. Thyasira vulcolutre is restricted to active seeps but there is no pattern in the distribution of the other thyasirid species. The chemosymbiotic bivalves collected are reviewed. Of the ten species closely associated with chemosynthetic settings two Solemyidae, Petrasma elarraichensis sp. nov. and Acharax gadirae sp. nov., one Lucinidae, Lucinoma asapheus sp. nov., and one Vesicomyidae, Isorropodon megadesmus sp. nov. are described and compared to close relatives of their respective families. The deep-water bivalve assemblages were also analyzed in detail. From the study of 759 specimens representing 49 species in 21 families, the diversity, distribution patterns and species turnover are described. The Ophiuroidea collected from mud volcanoes and adjacent bathyal environments from the Gulf of Cadiz are reviewed. Thirteen species included in four families, Ophiacanthidae, Ophiactidae, Amphiuridae and Ophiuridae were identified and one new species Ophiopristis cadiza sp. nov was described. Stable isotopes ratios (未13C, 未15N, 未34S) were determined in several species to investigate the trophic ecology of the benthic assemblages from mud volcanoes in the Gulf of Cadiz. The 未13C values for solemyid, lucinid and thyasirid bivalves are in line with data for other bivalves known to host thiotrophic symbionts. On the other hand, 未13C and 未34S values for the bathymodiolid species are compatible with the predominance of methanotrophy. The analyses of heterotrophic fauna indicate that the species inhabiting the crater of the mud volcanoes derive the bulk of their nutrition from chemoautolithotrophic sources. The indication by stable isotope analysis that autotrophic bacteria make a substantial contribution to the nutrition of the bivalve hosts, led us to investigate the bacterial endosymbionts and their phylogenetic relationship to other symbionts in bivalve hosts based on comparative 16S ribosomal RNA gene sequence analysis. Molecular analysis using PCR-DGGE (Denaturing Gradient Gel Electrophoresis) and cloning of bacterial 16S rRNA genes confirmed the presence of sulphur-oxidizing symbionts within gill tissues of the studied bivalve specimens and point out to the possibility of a dual sumbioses for Bathymodiolus mauritanicus The microbial diversity inside frenulata worms was also analyzed using the same molecular tools and revealed no patterns between species, MV, depth, age of animal and therefore seems to suggest that they do not seem to select for specific symbionts

    Suprabenthic fauna from the Bellingshausen Sea and West Antarctic Peninsula: spatial distribution and community structure

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    During the austral summers of 2003 and 2006 suprabenthic assemblages were investigated at 35 stations located in the Bellingshausen Sea and off the western Antarctic Peninsula, at depths ranging from 45 to 3280 m. Suprabenthos was collected with a Macer-GIROQ sledge equipped with an automatic opening and closing system. This study presents data on the occurrence and relative abundance of the major suprabenthic taxa collected in the water layer immediately adjacent to the bottom (10-140 cm above bottom). Assemblages were dominated by Peracarida and the most common groups were Amphipoda, Mysida, Isopoda and Cumacea. Among the 66 taxa identified, 40 account for more than 80% of the dissimilarity levels among any of the different combinations between groups of stations. The highest dissimilarity values in the segregation of the pairwise station groups were obtained for Mysidae, Lysianassidae, Gammaridea, Cumacea and Munnopsidae. The recorded faunistic patterns showed dependences in the environmental variables depth and percentage of mud in the sediment, as single and combined variables.Publicado

    Molekulargenetische Analyse von Biogeographie, Speziation und Biodiversit盲t der Asellota (Crustacea Isopoda) der antarktischen Tiefsee

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    Im Rahmen der Arbeit wurden f眉r 45 Taxa aus 14 Familien der Asellota vollst盲ndige 18S rDNA Sequenzen sowie f眉r 61 Individuen der Acanthaspidiidae und Haploniscidae partielle 16S rDNA amplifiziert und doppelstr盲ngig sequenziert. Die Sequenzpositionen wurden aliniert, hochvariable Positionen mittels Sekund盲rstrukturmodellen identifiziert und entfernt. Die Datens盲tze wurden mit Hilfe verschiedener phylogenetischer Verfahren analysiert. Alle Topologien best盲tigen die Monophylie typischer Tiefseefamilien (z. B. der Haploniscidae und Ischnomesidae), w盲hrend die Janiridae polyphyletisch sind. Eine Besiedlung der Tiefsee fand in mindestens vier Gruppen unabh盲ngig voneinander statt. Die Ergebnisse der 16S rDNA Analysen geben Hinweise auf die Existenz dreier reproduktiv isolierter Haplotypgruppen innerhalb des Taxons Acanthaspidia drygalskii und best盲tigen eine hohe genetische Variabilit盲t innerhalb morphologisch sehr 盲hnlicher Taxa der Gattung Haploniscus

    Cephalopod diversity and ecology

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    Acanthaspidia namibia n. sp. (Isopoda, Acanthaspidiidae) from the deep Angola Basin

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    Acanthaspidia namibia n. sp. was sampled off Namibia on the abyssal plain of the Angola Basin in 5390 m depth from board of the RV 鈥楳eteor鈥 in August 2000. Acanthaspidia neonotus (Menzies & George, 1972) is the most similar species, which has also been described from the deep sea, but from the Pacific Ocean in a comparative depth. The new species differs in bearing numerous long simple setae all over the body surface, and in the length of the maxillipedal epipod, which reaches the third palpal article, whereas that of A. neonotus reaches only the first
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