Arcachon, France
Arcachon, France

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Araujo R.M.,The Interdisciplinary Center | Assis J.,University of Algarve | Aguillar R.,Oceana Therapeutics | Airoldi L.,University of Bologna | And 30 more authors.
Biodiversity and Conservation | Year: 2016

A comprehensive expert consultation was conducted in order to assess the status, trends and the most important drivers of change in the abundance and geographical distribution of kelp forests in European waters. This consultation included an on-line questionnaire, results from a workshop and data provided by a selected group of experts working on kelp forest mapping and eco-evolutionary research. Differences in status and trends according to geographical areas, species identity and small-scale variations within the same habitat where shown by assembling and mapping kelp distribution and trend data. Significant data gaps for some geographical regions, like the Mediterranean and the southern Iberian Peninsula, were also identified. The data used for this study confirmed a general trend with decreasing abundance of some native kelp species at their southern distributional range limits and increasing abundance in other parts of their distribution (Saccharina latissima and Saccorhiza polyschides). The expansion of the introduced species Undaria pinnatifida was also registered. Drivers of observed changes in kelp forests distribution and abundance were assessed using experts’ opinions. Multiple possible drivers were identified, including global warming, sea urchin grazing, harvesting, pollution and fishing pressure, and their impact varied between geographical areas. Overall, the results highlight major threats for these ecosystems but also opportunities for conservation. Major requirements to ensure adequate protection of coastal kelp ecosystems along European coastlines are discussed, based on the local to regional gaps detected in the study. © 2016, Springer Science+Business Media Dordrecht.


Kavanagh F.A.,National University of Ireland | Frutos I.,University of Alcalá | Sorbe J.C.,Station Marine
Zootaxa | Year: 2015

A new species of Ischnomesidae (Crustacea: Isopoda: Asellota), Ischnomesus harrietae sp. nov. is described from the southern Bay of Biscay. This new species is distinctive due to the presence of numerous pedestal setae arranged in longitudinal rows on pereonite 5. Because of this morphological peculiarity, it can be easily distinguished from the four other Ischnomesus species previously reported from bathyal/abyssal bottoms of the European continental margin. Within its known distributional area, the new species inhabits sandy and muddy bottoms between 619 and 1099 m, with a maximum abundance of 41.8 individuals per 100 m2 recorded at approximately 700 m on the Arcachon Plateau. Another new species is also reported, Ischnomesus sp.1, represented by one specimen only and briefly described. An identification key to European species of Ischnomesus is provided. © 2015 Magnolia Press.


Arias A.H.,CONICET | Arias A.H.,National University of the South | Panebianco M.V.,Museo Argentino de Ciencias Naturales Bernardino Rivadavia | Panebianco M.V.,Maimónides University | And 9 more authors.
Journal of the Marine Biological Association of the United Kingdom | Year: 2016

Including a multi-year collection of samples (2004-2011) the present research fills 20 years of an information gap regarding the PCB burden in south-west Atlantic franciscana dolphins (Pontoporia blainvillei) while aiming to test the null hypothesis that PCBs congeners are increasingly bioaccumulating in south-west Atlantic specimens in relation to northern hemisphere records. In addition, the present survey analyses indicators of potential biological impairment associated to PCBs tissue burden. The results could associate each sampling area group of dolphins to one or two Aroclor® patterns and point to dominant regional diffuse sources entering PCBs mixtures to the marine environment with a possible regional/long-range atmospheric contribution. In addition, total PCB levels were from four to seven times lower than the closer precedents for the area (18-26 years ago) indicating a progress in the environmental release and biota exposure of PCBs and posing an objective indicator of success of the present international elimination programme. Further, when compared with regional and global bioaccumulation patterns, PCBs congeners in Argentinean specimens appeared to occur in a decreasing tendency. Finally, calculated TEQs TCDD levels raised a concern in regards to environmental safety, showing guideline values to be widely exceeded and the occasional occurrence of positive correlations between PCBs bioaccumulation vs. sexual immaturity. © Marine Biological Association of the United Kingdom 2015.


Frutos I.,C.O. Santander | Frutos I.,University of Alcalá | Sorbe J.C.,Station Marine
Deep-Sea Research Part II: Topical Studies in Oceanography | Year: 2014

The bathyal suprabenthic fauna of the Kostarrenkala area (Capbreton Canyon, SE Bay of Biscay) was sampled during daytime at eight stations located on a bathymetric transect between 175 and 1000m depth using a multinet suprabenthic sled. Two hundred and five suprabenthic taxa were recorded in this area, mainly amphipods, cumaceans, isopods and mysids. Total abundances ranged from 752 to 2640ind./100m2, showing a decreasing trend with depth. Diversity values (H') ranged between 3.83 and 5.72, increasing significantly with depth. Multivariate analysis of abundance data discriminated three assemblages according to depth: shelf break (72 sp., 1924ind./100m2), upper slope (93 sp., 1485ind./100m2) and mid slope (135 sp., 857ind./100m2) assemblages. Each assemblage was characterised by a distinct dominant species: the shelf amphipod Westwoodilla caecula at the shelf break, the isopod Munnopsurus atlanticus on muddy sand bottoms of the upper bathyal, and the amphipod Rhachotropis gracilis on mid-slope muddy bottoms below the mud line. Such a structure of bathyal assemblages seems to be generalised for the whole margin of the Bay of Biscay. © 2013 Elsevier Ltd.


PubMed | Station Marine, National University of Ireland and University of Alcalá
Type: Journal Article | Journal: Zootaxa | Year: 2015

A new species of Ischnomesidae (Crustacea: Isopoda: Asellota), Ischnomesus harrietae sp. nov. is described from the southern Bay of Biscay. This new species is distinctive due to the presence of numerous pedestal setae arranged in longitudinal rows on pereonite 5. Because of this morphological peculiarity, it can be easily distinguished from the four other Ischnomesus species previously reported from bathyal/abyssal bottoms of the European continental margin. Within its known distributional area, the new species inhabits sandy and muddy bottoms between 619 and 1099 m, with a maximum abundance of 41.8 individuals per 100 m2 recorded at approximately 700 m on the Arcachon Plateau. Another new species is also reported, Ischnomesus sp.1, represented by one specimen only and briefly described. An identification key to European species of Ischnomesus is provided.


Corbari L.,CNRS Systematics, Biodiversity and Evolution Institute | Sorbe J.C.,Station Marine
Zootaxa | Year: 2015

A new species belonging to a new genus of Maeridae, Papuadocus blodiwai gen. nov., sp. nov., is described from bathyal bottoms of the Bismarck Sea (Papua New Guinea). This genus/species can be distinguished from most other known maerids by right and left maxillas 1 with asymmetrical palps and by gnathopod 2 not sexually dimorphic. Its closest relative is the genus Bathyceradocus also characterized by asymmetrical maxillas 1, but differing by the presence of gill on coxae 7. These observations lead to the conclusion that the diagnosis of the family Maeridae has to be amended to receive both Bathyceradocus and Papuadocus genera. All the collected specimens lived in association with sunken wood, at 500-580 m depth. Copyright © 2015 Magnolia Press.


Marchini A.,University of Pavia | Sorbe J.-C.,Station Marine | Torelli F.,University of Pavia | Lodola A.,University of Pavia | Occhipinti-Ambrogi A.,University of Pavia
Mediterranean Marine Science | Year: 2014

An anthurid isopod, new to the Mediterranean Sea, has recently been observed in samples from three localities along the Italian coast: the Lagoon of Venice (North Adriatic Sea), La Spezia (Ligurian Sea) and Olbia (Sardinia, Tyrrhenian Sea). The specimens collected showed strong affinity to a species originally described from the NW Pacific Ocean: Paranthura japonica Richardson, 1909. The comparison with specimens from the Bay of Arcachon (Atlantic coast of France), where P. japonica had recently been reported as non-indigenous, confirmed the identity of the species. This paper reports on the most relevant morphological details of the Italian specimens, data on the current distribution of the species and a discussion on the pathways responsible for its introduction. The available data suggest that the presence of this Pacific isopod in several regions of coastal Europe might be due to a series of aquaculture-mediated introduction events that occurred during the last decades of the 1900s. Since then, established populations of P. japonica, probably misidentified, remained unnoticed for a long time.


Sorbe J.C.,Station Marine | Elizalde M.,Station Marine
Deep-Sea Research Part II: Topical Studies in Oceanography | Year: 2014

The suprabenthic community of the upper slope off Arcachon (site A at about 400m depth on a muddy sand substratum) was sampled monthly from February 1991 to January 1992 with a suprabenthic sled towed over the sea bottom. The fauna collected in the 0-50cm water layer above the bottom was classified into 9 major groups and 109 species (56 amphipods, 12 mysids, 10 isopods, 10 decapods, 9 cumaceans, 6 euphausiids, 4 fishes, 1 lophogastrid and 1 tanaid). The total abundance of the community fluctuated between a maximum of 3199 ind./100m2 in July and a minimum of 82 ind./100m2 in November, with an annual mean value of 969±601 ind./100m2. The community structure was mainly affected by the temporal abundance fluctuations of the asellote isopod Munnopsurus atlanticus. This species was numerically dominant during the first part of the year and showed a drastic decrease in August, followed by the dominance of the mysids Erythrops neapolitana or Parapseudomma calloplura in autumn and early winter. Such structural changes in the dominance of major taxa are discussed with respect to the feeding behaviour of species and food availability in the near-bottom environment. We conclude that the population dynamics of M. atlanticus in the upper bathyal was mainly governed by the seasonal development of its major prey, the benthic foraminifers, favoured by the spring phytodetritus deposition on the sea floor. © 2013 Elsevier Ltd.


PubMed | Station marine and CNRS Systematics, Biodiversity and Evolution Institute
Type: Journal Article | Journal: Zootaxa | Year: 2015

A new species belonging to a new genus of Maeridae, Papuadocus blodiwai gen. nov., sp. nov., is described from bathyal bottoms of the Bismarck Sea (Papua New Guinea). This genus/species can be distinguished from most other known maerids by right and left maxillas 1 with asymmetrical palps and by gnathopod 2 not sexually dimorphic. Its closest relative is the genus Bathyceradocus also characterized by asymmetrical maxillas 1, but differing by the presence of gill on coxae 7. These observations lead to the conclusion that the diagnosis of the family Maeridae has to be amended to receive both Bathyceradocus and Papuadocus genera. All the collected specimens lived in association with sunken wood, at 500-580 m depth.

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