Consulta: subjectFacets:"Benthic communities"
Registros recuperados: 12
Data/hora: 01/06/2024 03:27:07

Seasonal variation of the crustacean fauna in the belowground and aboveground strata in a Halodule wrightii meadow of northeastern Brazil
Provedor de dados: 76
Autores: Barros,Kcrishna V. S.; Souza-Filho,Jesser F.; Paiva,Ricardo J. C.; Araújo-Silva,Catarina L.; Almeida,Alexandre O.; Rocha-Barreira,Cristina A.
ABSTRACT The different microhabitats provided by seagrasses and the habit of the species determinate the vertical distribution of crustaceans. This study verified the influence of the seasonality on the spatial distribution of the crustacean community associated with a Halodule wrightii meadow. From April 2006 to July 2007, we performed fifteen samplings in Goiabeiras Beach, Ceará State, each with five sectioned replicates in belowground and aboveground. Cumaceans and the amphipod Hyale media (Dana, 1853) had a higher frequency, density, and dominance than the other taxa, in both strata. The community exhibited gradual changes along the study, in both the belowground and aboveground strata, but the seagrass structure was not sufficient to explain the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Seagrass; Shoal grass; Benthic communities.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212017000100248

Distribution, associated species and extent of biofouling “reefs” formed by the alien species Ficopomatus enigmaticus (Annelida, Polychaeta) in marinas
Provedor de dados: 5
Autores: 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

Impacts of climate change on coastal benthic ecosystems: assessing the current risk of mortality outbreaks associated with thermal stress in NW Mediterranean coastal areas
Provedor de dados: 5
Autores: Pairaud, Ivane; Bensoussan, Nathaniel; Garreau, Pierre; Faure, Vincent; Garrabou, Joaquim.
In the framework of climate change, the increase in ocean heat wave frequency is expected to impact marine life. Large-scale positive temperature anomalies already occurred in the northwestern Mediterranean Sea in 1999, 2003 and 2006. These anomalies were associated with mass mortality events of macrobenthic species in coastal areas (0–40 m in depth). The anomalies were particularly severe in 1999 and 2003 when thousands of kilometres of coasts and about 30 species were affected. The aim of this study was to develop a methodology to assess the current risk of mass mortality associated with temperature increase along NW Mediterranean continental coasts. A 3D regional ocean model was used to obtain the temperature conditions for the period 2001–2010, for...
Tipo: Text
Palavras-chave: Climate change; Benthic communities; Ocean modelling; Model validation; Impact mapping.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00171/28210/27707.pdf

Prospection et échantillonnage des émissaires en mer au large de la côte basque. Rapport de campagne - Micropolit année 1
Provedor de dados: 5
Autores: De Casamajor, Marie-noelle; Huguenin, Laura; Lissardy, Muriel.
This work aims to summarize the work carried out in the framework of surveys in subtidal environment on the French Basque coast in 2017. The course of this campaign is presented as well as the various data collected making it possible to establish a balance sheet. The latter refers to the fact that only one of the three targeted steps could be correctly sampled from a biological and ecological point of view. The analysis of the difficulties encountered during these investigations will make it possible to reframe the implementation of the protocol in order to best meet the objectives originally set during the 2018 sampling program.
Tipo: Text
Palavras-chave: Golfe de Gascogne; Émissaires subtidaux; État de conservation; Communautés benthique; Bay of Biscay; Subtidal outfall; Conservation index; Benthic communities.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00406/51739/52687.pdf

Impact of wastewater treatment plant discharges on macroalgae and macrofauna assemblages of the intertidal rocky shore in the southeastern Bay of Biscay
Provedor de dados: 5
Autores: Huguenin, L.; Lalanne, Y.; De Casamajor, Marie-noelle; Gorostiaga, J.-m.; Quintano, E.; Salerno, M.; Monperrus, M.
Rocky intertidal habitats are particularly vulnerable to anthropogenic pressures especially in areas with high urban concentrations such as southeastern Bay of Biscay. This research aims to establish an assessment of the potential impact of sewage discharges on intertidal rocky benthic assemblages on macroalgae and on macrofauna as required by the European Directives (Water Framework Directive -WFD and Marine Strategy Framework Directive -MSFD). The assemblages were sampled at five locations according to a control-impact design. A moderate detectable effect of discharges was highlighted on the assemblage structure by means of multivariate analyses but this was less evident using other biological and ecological metrics. Results would also suggest that...
Tipo: Text
Palavras-chave: Benthic communities; Bioindicators; Impacts; Pollution; Sewage; Marine strategy framework directive.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00494/60587/64070.pdf

Fishing effects on diversity, size and community structure of the benthic invertebrate and fish megafauna on the Bay of Biscay coast of France
Provedor de dados: 5
Autores: Blanchard, Fabian; Le Loc'H, Francois; Hily, Christian; Boucher, Jean.
Within the framework of the 'dynamic equilibrium model', we tested the hypothesis that fishing causes major disturbance to benthic communities on deeper bottoms of the continental shelf. Benthic megafauna on the Bay of Biscay coast of France was sampled on fishing grounds subject to various conditions of exploitation. Samples were taken at around 100 m depth to avoid strong natural disturbances. Species diversity and the largest body mass class of invertebrates were smaller in strongly exploited areas than in moderately exploited ones. Biomass size spectra in strongly exploited areas were characterised by a comparatively large biomass of small invertebrates, hence the K-dominance curve of abundance was either above the biomass curve, or the curves...
Tipo: Text
Palavras-chave: Benthic communities; Community dynamics; Disturbance; Diversity; Size spectrum.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00000/10896/7578.pdf

Changes in North Sea macrofauna communities and species distribution between 1986 and 2000
Provedor de dados: 5
Autores: Kroencke, Ingrid; Reiss, Henning; Eggleton, Jacqueline D.; Aldridge, John; Bergman, Magda J. N.; Cochrane, Sabine; Craeymeersch, Johan A.; Degraer, Steven; Desroy, Nicolas; Dewarumez, Jean-marie; Duineveld, Gerard C. A.; Essink, Karel; Hillewaert, Hans; Lavaleye, Marc S. S.; Moll, Andreas; Nehring, Stefan; Newell, Richard; Oug, Eivind; Pohlmann, Thomas; Rachor, Eike; Robertson, Mike; Rumohr, Heye; Schratzberger, Michaela; Smith, Rebecca; Berghe, Edward Vanden; Van Dalfsen, Jan; Van Hoey, Gert; Vincx, Magda; Willems, Wouter; Rees, Hubert L.
The North Sea Benthos Project 2000 was initiated as a follow-up to the 1986 ICES North Sea Benthos Survey with the major aim to identify changes in the macrofauna species distribution and community structure in the North Sea and their likely causes. The results showed that the large-scale spatial distribution of macrofauna communities in the North Sea hardly changed between 1986 and 2000, with the main divisions at the 50 m and 100 m depth contours. Water temperature and salinity as well as wave exposure, tidal stress and primary production were influential environmental factors on a large (North Sea-wide) spatial scale. The increase in abundance and regional changes in distribution of various species with a southern distribution in the North Sea in 2000...
Tipo: Text
Palavras-chave: Long-term variability; Distribution shift; NAOI; Regime shift; Non-native species; Benthic communities.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00043/15428/12888.pdf

Habitats et communautés benthiques du bassin oriental de la Manche : état des lieux au début du XXIe siècle
Provedor de dados: 5
Autores: Foveau, Aurelie.
This study is devoted in providing an updated knowledge on the macrobenthic community structure and biodiversity in the eastern English Channel in the early 2000s. Results obtained were compared with results obtained by L. Cabioch and colleagues for the period of 1971-1976. The distribution of macrobenthic communities is highly governed by the sedimentary cover. The Folk classification was used for sedimentology and mapping of bottom type characterization for the two study periods. A relative stability of the sedimentary cover was observed wherein 69% of the study area showed slight or no change in sedimentary cover. This is mainly due to the hydrodynamics in the area which is the dominant structuring factor in the eastern English Channel. Variations were...
Tipo: Text
Palavras-chave: Bassin oriental de la Manche; Couverture sédimentaire; Communautés benthiques; Diversité; Modélisation d’habitats; Comparaison; Eastern English Channel; Sedimentary cover; Benthic communities; Diversity; Habitat modeling; Comparison.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00083/19474/17089.pdf

Le Scléractiniaire Dendrophyllia cornigera en eau peu profonde, à Ouessant (Bretagne, Atlantique NE) en l'absence de barrière thermique
Provedor de dados: 5
Autores: Castricfey, A.
During a diving survey at Ushant island, the Scleractinian Dendrophyllia cornigera (Lamarck) was discovered at a depth of 30 m, below the laminarian zone. This is the shallowest record at present of this species, which is better known from the rocky bottoms between 200 and 500 m. Conditions favouring this occurrence in shallow water, as well as the occurrence of the species around 60-90 m in other coastal sites (Sein, Audierne, Penmarc'h, Glenan, Belle-Ile, Vigo), are examined, with special reference to temperature. D. cornigera tolerates temperatures ranging from 8 degrees C at its northern limit in the SW of Ireland, to 14 degrees C at its southern limit, in the Cape Verde Islands. Within its entire distribution range, the species displays some...
Tipo: Text
Palavras-chave: Dendrophyllia cornigera; Sublittoral; Rocky bottom; Benthic communities; North east Atlantic.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00096/20734/18371.pdf

Building functional groups of marine benthic macroinvertebrates on the basis of general community assembly mechanisms
Provedor de dados: 5
Autores: Alexandridis, Nikolaos; Bacher, Cedric; Desroy, Nicolas; Jean, Fred.
The accurate reproduction of the spatial and temporal dynamics of marine benthic biodiversity requires the development of mechanistic models, based on the processes that shape macroinvertebrate communities. The modelled entities should, accordingly, be able to adequately represent the many functional roles that are performed by benthic organisms. With this goal in mind, we applied the emergent group hypothesis (EGH), which assumes functional equivalence within and functional divergence between groups of species. The first step of the grouping involved the selection of 14 biological traits that describe the role of benthic macroinvertebrates in 7 important community assembly mechanisms. A matrix of trait values for the 240 species that occurred in the Rance...
Tipo: Text
Palavras-chave: Assembly mechanisms; Benthic communities; Biological traits; Emergent groups; Functional diversity; Functional redundancy.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00369/47975/48000.pdf

Responses of the molluscan fauna to environmental variations in a Halodule wrightii Ascherson ecosystem from Northeastern Brazil
Provedor de dados: 42
Autores: BARROS,KCRISHNA V.S.; ROCHA-BARREIRA,CRISTINA A.
ABSTRACTThis study observed the spatial and temporal distributions of molluscs in a Halodule wrightii meadow, verifying if they respond satisfactorily to seasonal changes in this seagrass ecosystem. Twenty-four species were identified. Chitons were rare, bivalves had greater number of species (11), followed by gastropods (9) which were also the most abundant class (73%). All classes were more abundant in the belowground. The most common species was Tricolia affinis, especially in aboveground. The occurrence of some species in both strata or out of the expected stratum may have been influenced by shallow layer of the sediment considered in this study, hydrodynamic, and low biomass of the studied meadow. According to univariate and multivariate analyses,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benthic communities; Hypnea musciformis; Marine food web; Northeast of Brazil; Seagrasses; Tricolia affinis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401397

Succession in rocky intertidal benthic communities in areas with different pollution levels at Guanabara Bay (RJ-Brazil)
Provedor de dados: 52
Autores: Breves-Ramos,André; Lavrado,Helena Passeri; Junqueira,Andrea de Oliveira Ribeiro; Silva,Sérgio Henrique Gonçalves da.
The aim of this study was to describe and compare the succession of intertidal benthic communities in two areas at Guanabara Bay, RJ, Brazil: Urca, an area submitted to moderated organic pollution and Catalão, an extremely polluted area. Three transects in each area were scraped one month before the beginning of this study in order to evaluate the recruitment (recruitment-treatments). Three other transects were monitored without manipulation (monitoring treatments). Species composition and relative abundance were evaluated monthly between September and December, 2000. A total of 26 species was found at Urca and 13 at Catalão. The percent cover of the most abundant organisms was not similar between treatments at Urca after four months, while in Catalão, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Benthic communities; Succession; Rocky intertidal zone; Guanabara Bay.
Ano: 2005
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000800012