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| Registros recuperados: 16 | |
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| Baltzer, Agnes; Reynaud, Marine; Ehrhold, Axel; Fournier, Jerome; Cordier, Celine; Clouet, Helene. |
| About a decade ago, a large field of pockmarks, covering an overall area of 36 km(2) was discovered in water depths of < 30m in the central part of the Bay of Concarneau (Southern Brittany, France). This field, composed of features from 5 m to 35 m in diameter and < 1 m in depth, is characterized by unusual high densities of pockmarks, up to 5840 per square kilometre. Geophysical data correlated with sedimentary samples acquired in 2005 and 2009 show that pockmarks and their immediate surroundings are associated with dense tubes benches cover, built by a filter-feeding amphipod: Haploops nirae, forming original benthic communities. Two complementary surveys were carried out in April 2011 (Pock and Ploops) and April 2014 (Pock and Tide), on the... |
| Tipo: Text |
Palavras-chave: Géophysique; Marée; Failles; Gaz; Geophysics; Pockmarks; Tide; Turbidity; Gas; Chimneys pipes; Concarneau. |
| Ano: 2017 |
URL: http://archimer.ifremer.fr/doc/00410/52107/52938.pdf |
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| De Los Santos, Carmen B.; Krause-jensen, Dorte; Alcoverro, Teresa; Marbà, Núria; Duarte, Carlos M.; Van Katwijk, Marieke M.; Pérez, Marta; Romero, Javier; Sánchez-lizaso, José L.; Roca, Guillem; Jankowska, Emilia; Pérez-lloréns, José Lucas; Fournier, Jerome; Montefalcone, Monica; Pergent, Gérard; Ruiz, Juan M.; Cabaço, Susana; Cook, Kevan; Wilkes, Robert J.; Moy, Frithjof E.; Trayter, Gregori Muñoz-ramos; Arañó, Xavier Seglar; De Jong, Dick J.; Fernández-torquemada, Yolanda; Auby, Isabelle; Vergara, Juan J.; Santos, Rui. |
| Seagrass meadows, key ecosystems supporting fisheries, carbon sequestration and coastal protection, are globally threatened. In Europe, loss and recovery of seagrasses are reported, but the changes in extent and density at the continental scale remain unclear. Here we collate assessments of changes from 1869 to 2016 and show that 1/3 of European seagrass area was lost due to disease, deteriorated water quality, and coastal development, with losses peaking in the 1970s and 1980s. Since then, loss rates slowed down for most of the species and fast-growing species recovered in some locations, making the net rate of change in seagrass area experience a reversal in the 2000s, while density metrics improved or remained stable in most sites. Our results... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00508/61966/66058.pdf |
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| Fournier, Jerome; Corbeau, Alexandre; Le Mao, Patrick. |
| Motpho-sedimentology of coastal natural sites colonized by Sand Martin (Riparia riparia). The Sand Martin or Bank Swallow Riparia riparia retums annually to a same site to establish a colony. These sites are natural or anthropogenic origin but are still subject to permanent changes. The species is characterized by its ability to dig tunnels in which it carries out its reproductive cycle. Several authors have attempted to identify the criteria used by the swallows to choose a favourable site to the installation of a colony. Among the many parameters that can help explain the location of colonies, morpho-sedimentary settings have been poorly documented. Among abiotic factors, the composition of the soil particles seems to play an important role in the depth... |
| Tipo: Text |
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| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00383/49472/49958.pdf |
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| De Smet, Bart; D'Hondt, An-sofie; Verhelst, Pieterjan; Fournier, Jerome; Godet, Laurent; Desroy, Nicolas; Rabaut, Marijn; Vincx, Magda; Vanaverbeke, Jan. |
| Biogenic reefs composed of the tube-building polychaete Lanice conchilega are important from a conservation point of view because they noticeably increase the biodiversity in otherwise species poor environments. However, up to now, little or no attention has been paid to the intertidal epi- and hyperbenthic communities associated with the reefs. Therefore, this is the first study which focuses on the effect of L. conchilega reefs on the entire bentho-pelagic community at two different locations. Environmental variables were measured and macro-, epi- and hyperbenthic communities were sampled within a L. conchilega reef and a control area at two locations in France: the bay of the Mont Saint-Michel (BMSM) and Boulogne-sur-Mer (Boulogne). The effect of the... |
| Tipo: Text |
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| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00226/33764/32190.pdf |
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| Desroy, Nicolas; Dubois, Stanislas; Fournier, Jerome; Ricquiers, L.; Le Mao, Patrick; Guerin, Laurent; Gerla, Daniel; Rougerie, Michel; Legendre, Aurelie. |
| 1. Reefs built by the annelid worm Sabellaria alveolata in the Bay of Mont-Saint-Michel (France) are the most extensive intertidal biogenic structures within Europe. Before and after mussel farming extensions, a study designed to provide a biological health index of the Sainte-Anne reef (223 ha) was carried in 2001 and 2007 to serve as an easy-to-use management tool and to ensure endangered reef portions were properly targeted and protected. 2. Coupled physical and biological parameters were included in a spatial Health Status Index (HI). A spatial and temporal mapping survey of the HI showed a continuous deterioration of the reef's state of health, particularly in its central part. This degradation correlates with the colonization of the Pacific oyster... |
| Tipo: Text |
Palavras-chave: Sabellaria alveolata; Biogenic reef; Health status; Biological indicator; Shellfish farming; Recreational fishing activities. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00043/15430/12887.pdf |
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| De Smet, Bart; Godet, Laurent; Fournier, Jerome; Desroy, Nicolas; Jaffre, Mikael; Vincx, Magda; Rabaut, Marijn. |
| The tube-building polychaete Lanice conchilega can form dense populations, often called reefs, which promote benthic community change and constitute feeding grounds for secondary consumers. The aim of this study was to quantify the role of the L. conchilega reef of the Bay of the Mont Saint-Michel (BMSM) for feeding waders, by combining macrobenthos data, bird counts and bird diet information. Wader densities in the reef were on average 46.6 times higher than in non-reef areas. According to faecal analyses, waders in the reef mainly selected the accompanying fauna and especially crustaceans. The attractiveness of the reef to feeding birds may be largely explained by the high abundance, richness and biomass of macrobenthic species in the reef compared with... |
| Tipo: Text |
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| Ano: 2013 |
URL: http://archimer.ifremer.fr/doc/00134/24556/22769.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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| Ponsero, Alain; Sturbois, Anthony; Desroy, Nicolas; Le Mao, Patrick; Jones, Auriane; Fournier, Jerome. |
| The relationship between foraging shorebirds, macrobenthos and sedimentary parameters has been widely studied across Western Europe. Megatidal areas have large zones uncovered when the water retreats. Consequently, in such cases, the tide also influences foraging activities. This paper examines the use of an intertidal space by waders to define how macrobenthic resource concentrates foraging activity of birds in a large megatidal sandflat. This approach combines accurate spatial distribution of waders (Oystercatcher, Eurasian curlew, Bar-tailed Godwit and Redknot) according to their activity with ecological/biological parameters. A differential exploitation of the flat is clearly shown, with macrobenthic biomass appearing as one of the main explanatory... |
| Tipo: Text |
Palavras-chave: Waders; Benthos; Foraging behavior; Sandflat; Megatidal environment. |
| Ano: 2016 |
URL: http://archimer.ifremer.fr/doc/00340/45168/44563.pdf |
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| Michel, Loic; Danis, Bruno; Dubois, Philippe; Eleaume, Marc; Fournier, Jerome; Gallut, Cyril; Jane, Philip; Lepoint, Gilles. |
| In recent years, sea ice cover along coasts of East Antarctica has tended to increase. To understand ecological implications of these environmental changes, we studied benthic food web structure on the coasts of Adélie Land during an event of unusually high sea ice cover (i.e. two successive austral summers without seasonal breakup). We used integrative trophic markers (stable isotope ratios of carbon, nitrogen and sulfur) to build ecological models and explored feeding habits of macroinvertebrates. In total, 28 taxa spanning most present animal groups and functional guilds were investigated. Our results indicate that the absence of seasonal sea ice breakup deeply influenced benthic food webs. Sympagic algae dominated the diet of many key consumers, and... |
| Tipo: Text |
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| Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00500/61194/64726.pdf |
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| Godet, Laurent; Fournier, Jerome; Jaffre, Mikael; Desroy, Nicolas. |
| In coastal areas, reef-builder worms often are bio-engineers by structuring their physical and biological environment. Many studies showed that this engineering role is determined by the densities of the engineer species itself, the highest densities approximately corresponding to the most stable areas from a sedimentological point of view, and hosting the richest and the most diverse benthic fauna. Here, we tested the potential influence of the spatio-temporal dynamics and the spatial fragmentation of one of the largest European intertidal reefs generated by the marine worm Lanice conchilega (Pallas, 1766) (Annelida, Polychaeta) on the associated benthic macrofauna. We demonstrated that the worm densities do have a significant positive role on the... |
| Tipo: Text |
Palavras-chave: Reefs; Zoobenthos; Stability; Fragmentation; Tidal flats; Bay of the Mont-Saint-Michel. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00044/15560/12973.pdf |
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| Sturbois, Anthony; Ponsero, Alain; Desroy, Nicolas; Le Mao, Patrick; Fournier, Jerome. |
| The feeding ecology of the red knot has been widely studied across its wintering range. Red knots mainly select bivalves and gastropods, with differences between sites due to variation in prey availability. Shorebird’s diet is also influenced or controlled by the tidal regime. The aim of this paper is to demonstrate the adaptation of foraging red knots to the megatidal environment. The variation in their diet during tidal cycles was studied in the bay of Saint-Brieuc, a functional unit for this species. The method used combined macrofauna, distribution of foraging birds and diet data. Comparative spatial analyses of macrofauna and distribution of foraging red knots have shown that the bay's four benthic assemblages are exploited by birds. By analysing... |
| Tipo: Text |
Palavras-chave: Diet; Benthos; Intertidal flat; Megatidal environment; Bay of Saint-Brieuc. |
| Ano: 2015 |
URL: http://archimer.ifremer.fr/doc/00226/33767/32194.pdf |
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| Soissons, Laura M.; Haanstra, Eeke P.; Van Katwijk, Marieke M.; Asmus, Ragnhild; Auby, Isabelle; Barille, Laurent; Brun, Fernando G.; Cardoso, Patricia G.; Desroy, Nicolas; Fournier, Jerome; Ganthy, Florian; Garmendia, Joxe-mikel; Godet, Laurent; Grilo, Tiago F.; Kadel, Petra; Ondiviela, Barbara; Peralta, Gloria; Puente, Araceli; Recio, Maria; Rigouin, Loic; Valle, Mireia; Herman, Peter M. J.; Bouma, Tjeerd J.. |
| Seagrass meadows form highly productive and valuable ecosystems in the marine environment. Throughout the year, seagrass meadows are exposed to abiotic and biotic variations linked to (i) seasonal fluctuations, (ii) short-term stress events such as, e.g., local nutrient enrichment, and (iii) small-scale disturbances such as, e.g., biomass removal by grazing. We hypothesized that short-term stress events and small-scale disturbances may affect seagrass chance for survival in temperate latitudes. To test this hypothesis we focused on seagrass carbon reserves in the form of starch stored seasonally in rhizomes, as these have been defined as a good indicator for winter survival. Twelve Zostera noltei meadows were monitored along a latitudinal gradient in... |
| Tipo: Text |
Palavras-chave: Carbon reserves; European Atlantic coast; Latitude; Resilience; Zostera noltei; Climate setting; Stress events. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00423/53420/54308.pdf |
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| Registros recuperados: 16 | |
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