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Registros recuperados: 16
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Biogenic reefs affect multiple components of intertidal soft-bottom benthic assemblages: The Lanice conchilega case study ArchiMer
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...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00226/33764/32190.pdf
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Distribution, associated species and extent of biofouling “reefs” formed by the alien species Ficopomatus enigmaticus (Annelida, Polychaeta) in marinas ArchiMer
Charles, M.; Faillettaz, Robin; Desroy, Nicolas; Fournier, Jerome; Costil, Katherine.
Artificial structures in ports are commonly colonized by non-indigenous epifauna that tolerate high pollution levels. Bioconstructions built by alien species may offer sheltered microhabitats for motile (vagile) animals but biofouling often becomes detrimental to human activities. In this context, the present study provides an inventory of 1) the extent of biofouling related to the alien Polychaeta Ficopomatus enigmaticus on hard structures of marinas in Normandy, France, and 2) the biodiversity of sessile (attached) or vagile (motile) fauna associated with these “reefs”, including both native and alien species. Reefs built by F. enigmaticus were found in 6 out of 12 marinas with oligohaline-mesohaline waters. Significant differences in the total volume of...
Tipo: Text Palavras-chave: Biofouling; Ficopomatus enigmaticus; Benthic communities; Alien species; Marinas; Normandy (France).
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00449/56052/57572.pdf
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Ephemeral Bio-engineers or Reef-building Polychaetes: How Stable are Aggregations of the Tube Worm Lanice conchilega (Pallas, 1766)? ArchiMer
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....
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00011/12222/9284.pdf
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Exploitation of intertidal feeding resources by the Red Knot Calidris canutus under megatidal conditions (Bay of Saint-Brieuc, France) ArchiMer
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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Feeding grounds for waders in the Bay of the Mont Saint-Michel (France): the Lanice conchilega reef serves as an oasis in the tidal flats ArchiMer
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...
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00134/24556/22769.pdf
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How do macrobenthic resources concentrate foraging waders in large megatidal sandflats? ArchiMer
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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Increased sea ice cover alters food web structure in East Antarctica ArchiMer
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...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00500/61194/64726.pdf
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Influence of stability and fragmentation of a worm-reef on benthic macrofauna ArchiMer
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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Interplay between abiotic factors and species assemblages mediated by the ecosystem engineer Sabellaria alveolata (Annelida: Polychaeta) ArchiMer
Jones, Auriane; Dubois, Stanislas; Desroy, Nicolas; Fournier, Jerome.
abellaria alveolata is a gregarious polychaete that uses sand particles to build three-dimensional structures known as reefs, fixed atop rocks or built on soft sediments. These structures are known to modify the local grain-size distribution and to host a highly diversified macrofauna, altered when the reef undergoes disturbances. The goal of this study was to investigate the different sedimentary and biological changes associated with the presence of a S. alveolata reef over two contrasting seasons (late winter and late summer), and how these changes were linked. Three different sediments were considered: the engineered sediment (the actual reef), the associated sediment (the soft sediment surrounding the reef structures) and a control soft sediment (i.e....
Tipo: Text Palavras-chave: Honeycomb worm; Macrobenthos; Benthic primary production; Habitat disturbance; Silt; Beta diversity; France; Brittany; Mont Saint-Michel Bay.
Ano: 2018 URL: http://archimer.ifremer.fr/doc/00405/51649/52198.pdf
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Latitudinal Patterns in European Seagrass Carbon Reserves: Influence of Seasonal Fluctuations versus Short-Term Stress and Disturbance Events ArchiMer
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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Morpho-sédimentologie des sites naturels littoraux colonisés par l’Hirondelle de rivage (Riparia riparia) ArchiMer
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...
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Ano: 2016 URL: http://archimer.ifremer.fr/doc/00383/49472/49958.pdf
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Phylogeography of the reef-building polychaetes of the genus Phragmatopoma in the western Atlantic Region ArchiMer
Nunes, Flavia; Van Wormhoudt, Alain; Faroni-perez, Larisse; Fournier, Jerome.
Aim To verify the synonymy of the reef-building polychaete Phragmatopoma caudata (described for the Caribbean) and Phragmatopoma lapidosa (described for Brazil) using molecular data. To evaluate the patterns of genetic diversity and connectivity among populations from Florida to South Brazil. Location Intertidal zone in the western Atlantic biogeographical Region: Brazil, eastern Caribbean and Florida (USA). Methods DNA sequence data from one mitochondrial (cox-1) and one nuclear ribosomal (ITS-1) loci were obtained from 11 populations of P. caudata spanning the coasts of Brazil, eastern Caribbean and Florida. Phylogenetic relationships among populations of P. caudata and other members of the genus were inferred by Bayesian methods. Population...
Tipo: Text Palavras-chave: Biogeographical barrier; Brazilian Province; Caribbean Province; Connectivity; Larval dispersal; Phragmatopoma caudata; Phylogenetics; Phylogeography; Polychaete reef; Western Atlantic Region.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00363/47376/47710.pdf
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Recent trend reversal for declining European seagrass meadows ArchiMer
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...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00508/61966/66058.pdf
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Space-time evolution of a large field of pockmarks in the Bay of Concarneau (NW Brittany) ArchiMer
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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The conservation status of Sabellaria alveolata (L.) (Polychaeta: Sabellariidae) reefs in the Bay of Mont-Saint-Michel ArchiMer
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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Using airborne laser altimetry to estimate Sabellaria alveolata (Polychaeta: Sabellariidae) reefs volume in tidal flat environments ArchiMer
Noernberg, Mauricio Almeida; Fournier, Jerome; Dubois, Stanislas; Populus, Jacques.
This study has exploited aerial photographs and LiDAR digital elevation model to quantify intertidal complex landforms volume. A first volume estimation of the main sabellariid polychaete reef complex of the Bay of Mont-Saint-Michel - France is presented. The Sabellaria alveolata is an engineering species that heavily modifies its environment. This gregarious tube-building annelid forms dense and solid reefs of bioclastic coarse sand which can reach several km(2). Since 1970 a very strong decline of reefs has been observed. The authorities have curbed fishing activities without any noticeable changes in reef health status. The S. alveolata reef volume is estimated to be 132 048 m(3) (96 301 m(3) for Sainte-Anne reef and 35 747 m(3) for Champeaux reef)....
Tipo: Text Palavras-chave: LiDAR; Volume; Reef-building polychaete; Sabellaria alveolata; Tidal flats; Bay of Mont-Saint-Michel.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00018/12905/9942.pdf
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