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| Registros recuperados: 42 | |
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| Jabot, Franck; Giraldo, Carolina; Lefebvre, Sebastien; Dubois, Stanislas. |
| Isotopic analyses are increasingly used to assess the structure of food webs and a series of isotopic functional indices have been proposed in the last decade to characterize this structure. These indices are based on the foundational assumption that proximity in the isotopic space informs on trophic similarity between species. While it has been recognized for long that this simplifying assumption should be used with caution, no formal evaluation of its domain of validity has been performed to date. We here simulate a large number (15,000) of food webs with varying characteristics to assess i) whether isotopic distance is a good proxy of trophic dissimilarity; ii) whether isotopic functional indices are good proxies of trophic functional properties; and... |
| Tipo: Text |
Palavras-chave: Connectance; Isotopic functional indices; Niche model; Omnivory; Virtual ecology. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00385/49596/50110.pdf |
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| Wethey, David S.; Woodin, Sarah A.; Berke, Sarah K.; Dubois, Stanislas. |
| The ecosystem engineer onuphid polychaete Diopatra biscayensis has a continuous population in the Bay of Biscay from the Cantabria coast in Spain to southern Brittany in France. A group of disjunct populations also are found in the English Channel, separated from the Biscay population by more than 400 coastal kilometers. It remains unclear whether D. biscayensis is native to the Bay of Biscay; it is also debated whether the disjunct populations in the English Channel are relics of a formerly continuous population, or the product of recent introductions through aquaculture. Here, we use climate hindcasts to explore hypotheses about the D. biscayensis historical distribution in Europe. If D. biscayensis is native, its range would have been restricted to... |
| Tipo: Text |
Palavras-chave: Climate change; Biogeography; Metapopulation; Diopatra; Historical projections. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00356/46711/46974.pdf |
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| Curd, Amelia; Pernet, Fabrice; Corporeau, Charlotte; Delisle, Lizenn; Firth, Louise B.; Nunes, Flavia; Dubois, Stanislas. |
| The honeycomb worm Sabellaria alveolata is capable of building extensive bioconstructions, including what are currently considered Europe’s largest biogenic reefs. The size and volume of these bioconstructions, however, vary greatly, such that not all habitats engineered by S. alveolata may be easily identified as reefs. Given that European environmental legislation protects marine habitats that are classified as “reefs”, it is important to identity a clear set of definition criteria. Furthermore, quantifiable and unequivocal criteria are also needed to evaluate the ecological (health) state of these reefs, in order to best monitor and protect them. Here we propose new terminology to describe the physical appearance of these bioconstructions and attempt to... |
| Tipo: Text |
Palavras-chave: Biochemical indicators; Health; Ecological status; Sabellaria alveolata; Biogcnic reef; Engineer species. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00464/57608/60175.pdf |
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| Callaway, Ruth; Desroy, Nicolas; Dubois, Stanislas; Fournier, Jerome; Frost, Matthew; Godet, Laurent; Hendrick, Vicki J.; Rabaut, Marijn. |
| Dense aggregations of tube-worms can stabilize sediments and generate oases for benthic communities that are different and often more diverse and abundant than those of the surroundings. If these features are to qualify as biogenic reefs under nature-conservation legislation such as the EC Habitats Directive, a level of stability and longevity is desirable aside from physical and biological attributes. Lanice conchilega (Pallas, 1766) is widely distributed around the European coast and aggregations of this tube-dwelling polychaete are known to have a positive effect on the biodiversity of associated species in inter- and sub-tidal areas. This increases the value of L. conchilega-rich habitats for higher trophic levels such as birds and fish. However, L.... |
| Tipo: Text |
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| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00011/12222/9284.pdf |
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| La Riviere, Marie; Aish, Annabelle; Auby, Isabelle; Ar Gall, Erwan; Dauvin, Jean-claude; De Bettignies, Thibaut; Derrien-courtel, Sandrine; Dubois, Stanislas; Gauthier, Olivier; Grall, Jacques; Janson, Anne Laure; Thiebaut, Eric. |
| Le Ministère de l’Environnement de l’Energie et de la Mer a confié au Service du Patrimoine Naturel (Muséum National d’Histoire Naturelle), en lien étroit avec les acteurs de la recherche scientifique, la coordination d’un projet sur l’évaluation de la sensibilité des habitats benthiques aux pressions d’origine anthropique. L’objectif de ce travail est de qualifier la sensibilité générique des habitats présents en France métropolitaine pour aider à l’orientation et à la priorisation de mesures de gestion (pour des activités actuelles ou futures), adaptées aux enjeux de conservation, afin de respecter les objectifs d’atteinte ou de maintien d’un ECF (DCSMM) ou BEE (DHFF). Ce travail permet également de mettre en évidence les habitats et/ou les pressions... |
| Tipo: Text |
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| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00376/48699/49033.pdf |
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| Ricquiers, Laurent; Desroy, Nicolas; Dubois, Stanislas; Guerin, Laurent; Gerla, Daniel; Legendre, Aurelie; Le Mao, Patrick; Rougerie, Michel. |
| L’état de santé du récif à Sabellaria alveolata de Sainte-Anne a été évalué afin de juger des conséquences des activités menées en baie du Mont Saint Michel (conchyliculture, pêche à pied…) sur ce patrimoine naturel remarquable. Un relevé de différents paramètres a été conduit en 2002 (Dubois, 2003), puis en 2007 sur ce récif subdivisé en carrés de 75x75m. Parmi les données collectées, ont été cartographiées (à l’aide du logiciel SURFER®) afin d’apprécier l’évolution du récif : (1) le recouvrement du récif par les huîtres ; (2) le degré de fragmentation et (3) l’indice d’état de santé (IS) |
| Tipo: Text |
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| Ano: 2007 |
URL: https://archimer.ifremer.fr/doc/00156/26686/24748.pdf |
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| Rigolet, Carinne; Thiebaut, Eric; Dubois, Stanislas. |
| Stable carbon and nitrogen isotopic composition (delta C-13 and delta N-15) of benthic organisms was investigated to understand the effects of a gregarious tubicolous amphipod species (Haploops nirae) on benthic food web structures and test whether drastic changes in species composition cause changes in food web structure. The habitat engineered by this species was sampled and compared with the adjacent uncolonized Amphiura filiformis muddy habitat in winter and summer. The isotopic signatures of macrofaunal and megafaunal species associated with both habitats were analysed along with potential food sources at each sampling period. Similar food web structures for each habitat (and each season), with high delta N-15 ranges spanning over 3 trophic levels,... |
| Tipo: Text |
Palavras-chave: Stable isotopes; Gregarious amphipod; Source contribution; Haploops; Benthic diatoms; Navicula. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00187/29822/28259.pdf |
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| Portail, Marie; Olu, Karine; Dubois, Stanislas; Escobar-briones, Elva; Gelinas, Yves; Menot, Lenaick; Sarrazin, Jozee. |
| In the Guaymas Basin, the presence of cold seeps and hydrothermal vents in close proximity, similar sedimentary settings and comparable depths offers a unique opportunity to assess and compare the functioning of these deep-sea chemosynthetic ecosystems. The food webs of five seep and four vent assemblages were studied using stable carbon and nitrogen isotope analyses. Although the two ecosystems shared similar potential basal sources, their food webs differed: seeps relied predominantly on methanotrophy and thiotrophy via the Calvin-Benson-Bassham (CBB) cycle and vents on petroleum-derived organic matter and thiotrophy via the CBB and reductive tricarboxylic acid (rTCA) cycles. In contrast to symbiotic species, the heterotrophic fauna exhibited high... |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00353/46390/46018.pdf |
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| Perga, Marie-elodie; Danger, Michael; Dubois, Stanislas; Fritch, Clementine; Gaucherel, Cedric; Hubas, Cedric; Jabot, Franck; Lacroix, Gerard; Lefebvre, Sebastien; Marmonier, Pierre; Bec, Alexandre. |
| The French National Institute of Ecology and Environment (INEE) aims at fostering pluridisciplinarity in Environmental Science and, for that purpose, funds ex muros research groups (GDR) on thematic topics. Trophic ecology has been identified as a scientific field in ecology that would greatly benefit from such networking activity, as being profoundly scattered. This has motivated the seeding of a GDR, entitled “GRET”. The contours of the GRET's action, and its ability to fill these gaps within trophic ecology at the French national scale, will depend on the causes of this relative scattering. This study relied on a nationally broadcasted poll aiming at characterizing the field of trophic ecology in France. Amongst all the unique individuals that fulfilled... |
| Tipo: Text |
Palavras-chave: Trans-ecosystem; Scientific network; Cleavage; Ecology; Population; Community. |
| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00442/55338/56849.pdf |
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| Chaalali, Aurelie; Brind'Amour, Anik; Dubois, Stanislas; Le Bris, Herve. |
| Through their tissues or activities, engineer species create, modify, or maintain habitats and alter the distribution and abundance of many plants and animals. This study investigates key ecological functions performed by an engineer species that colonizes coastal ecosystems. The gregarious tubiculous amphipod Haploops nirae is used as a biological model. According to previous studies, the habitat engineered by H.nirae (i.e., Haploops habitat) could provide food and natural shelter for several benthic species such as benthic diatoms belonging to the gender Navicula, the micrograzer Geitodoris planata, or the bivalve Polititapes virgineus. Using data from scientific surveys conducted in two bays, this study explored whether (1) the Haploops sandy-mud... |
| Tipo: Text |
Palavras-chave: Coastal nurseries; Fish community; Haploops nirae; Isotopic diversity indices; Stable isotopes. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00396/50722/51431.pdf |
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| Bajjouk, Touria; Jauzein, Cecile; Drumetz, Lucas; Dalla Mura, Mauro; Duval, Audrey; Dubois, Stanislas. |
| Sabellaria alveolata is a sedentary gregarious tube-building species widely distributed from southwest Scotland to Morocco. This species builds what are currently considered the largest European biogenic reefs in the bay of Mont-Saint-Michel (France). As an ecosystem engineer, S. alveolata generates small to large scale topographic complexity, creating numerous spatial and trophic niches for other species to colonize. Sabellaria reefs are also under anthropogenic pressures, leading locally to massive degradation. However, stakeholders lack spatially explicit measures of reef ecological status, at adapted spatial resolution to provide key management information for this protected habitat. Traditional field surveys are extremely time-consuming and rely on... |
| Tipo: Text |
Palavras-chave: Benthic habitats; Biogenic reefs; Ecological status; Hyperspectral; Intertidal; Lidar; Mapping. |
| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00654/76574/77710.pdf |
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| Collin, Antoine; Dubois, Stanislas; James, Dorothée; Houet, Thomas. |
| Coastal living reefs provide considerable services from tropical to temperate systems. Threatened by global ocean-climate and local anthropogenic changes, reefs require spatially explicit management at the submeter scale, where socioecological processes occur. Drone surveys have adequately addressed these requirements with red-green-blue (RGB) orthomosaics and digital surface models (DSMs). The use of ancillary spectral bands has the potential to increase the mapping of all reefscapes that emerge during low tide. This research investigates the contribution of the drone-based red edge (RE), near-infrared (NIR), and DSM into the classification accuracy of five main habitats of the largest intertidal biogenic reefs in Europe, built by the honeycomb worm... |
| Tipo: Text |
Palavras-chave: Reefs; Red edge; Near-infrared; Digital surface model; Classification; Sabellaria alveolata. |
| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00512/62326/66584.pdf |
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| Pascal, Pierre-yves; Dubois, Stanislas; Goffette, Anais; Lepoint, Gilles. |
| The activity of the geothermal plant at Bouillante in Guadeloupe (French West Indies) releases thioautotrophic bacteria into the coastal environment. Fish counts reveal that fish abundance increases with higher availability of this bacterial resource. In order to evaluate the trophic role of these bacteria, isotopic compositions (C, N, S) of potential consumers were evaluated on transects at increasing distance from the source of bacteria. The 3 mobile fish species examined (Abudefduf saxatilis, Acanthurus bahianus, and Stegastes partitus) ingested and assimilated chemosynthetic bacteria. Similarly, the isotopic composition of the mobile sea urchin Diadema antillarum was different close to the discharge channel, suggesting a diet mainly composed of sulfur... |
| Tipo: Text |
Palavras-chave: Shallow vent; Food web; Sulfur bacteria; Stable isotope. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00404/51511/52256.pdf |
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| Ventura, Daniele; Dubois, Stanislas; Bonifazi, Andrea; Jona Lasinio, Giovanna; Seminara, Marco; Gravina, Maria F.; Ardizzone, Giandomenico; Scales, Kylie; Rowlands, Gwilym. |
| Characterizing and monitoring changes in biogenic 3‐dimensional (3D) structures at multiple scales over time is challenging within the practical constraints of conventional ecological tools. Therefore, we developed a structure‐from‐motion (SfM)‐based photogrammetry method, coupled with inspection and mesh processing software, to estimate important ecological parameters of underwater worm colonies (hummocks) constructed by the sabellariid polychaete Sabellaria alveolata, using non‐destructive, 3D modeling and mesh analysis. High resolution digital images of bioconstructions (hummocks) were taken in situ under natural conditions to generate digital 3D models over different sampling periods to analyse the morphological evolution of four targeted hummocks. 3D... |
| Tipo: Text |
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| Ano: 2020 |
URL: https://archimer.ifremer.fr/doc/00654/76569/77699.pdf |
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| Brind'Amour, Anik; Dubois, Stanislas. |
| Recently revisited, the concept of niche ecology has lead to the formalisation of functional and trophic niches using stable isotope ratios. Isotopic diversity indices (IDI) derived from a set of measures assessing the dispersion/distribution of points in the δ-space were recently suggested and increasingly used in the literature. However, three main critics emerge from the use of these IDI: 1) they fail to account for the isotopic sources overlap, 2) some indices are highly sensitive to the number of species and/or the presence of rare species, and 3) the lack of standardization prevents any spatial and temporal comparisons. Using simulations we investigated the ability of six commonly used IDI to discriminate among different trophic food web structures,... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00171/28270/26522.pdf |
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| Registros recuperados: 42 | |
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