Consulta: subjectFacets:"Fishing impact"
Registros recuperados: 9
Data/hora: 05/06/2024 11:58:30

Fishing effects on the diversity dynamics of demersal fish communities. Comparative analysis of the role of the interactions between specices in the Bay of Biscay and in the Gulf of Lion (France).
Provedor de dados: 5
Autores: Blanchard, Fabian.
This work deals with the fishing effects on the diversity dynamics of demersal fish communities, focusing on the biotic interactions. Multispecies indices were used in order to characterise the demersal fish community dynamics of the Bay of Biscay and of the Gulf of Lions. These are the diversity indices, the temporal variability of the total biomass and of the slope of the number size spectra and the slope of the species-area curves (spatial segregation). The data were provided by yearly bottom trawl surveys EVHOE, CHALIST and MEDITS carried out in these two areas since 1983 by IFREMER for stock assessment. The differences between areas are related to a fishing index (mean value of the annual landings of demersal fish per surface area). Other areas are...
Tipo: Text
Palavras-chave: Demersal fish; ANE; Bay of Biscay; Gulf of Lions; Fish communities; Fishing impact; Biodiversity; Biotic interactions; Spatial segregation; Biomass variability; Size spectrum.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00000/10248/7688.pdf

Intégrité des habitats benthiques du plateau continental face aux perturbations physiques naturelles et aux arts trainants : quelles méthodes d'observations ? Comment suivre le retour vers un bon état écologique ?
Provedor de dados: 5
Autores: Jac, Cyrielle.
In 2008, the European Union drew up the Marine Strategy Framework Directive (MSFD) with the aim of achieving Good Environmental Status of marine waters. By linking the changes observed to the pressures experienced, this directive is defined as a tool designed to better control environmental degradation factors and to assess their implications. Several descriptors are defined within the framework of MSFD, in particular descriptors 1 relating to the biological diversity of the seabed and 6 relating to the integrity of the seabed (i.e. the quality of its structures and functions). As dragging (trawling and dredging) is the main source of disturbance of continental shelf seabed, it is essential to study its impact. However, its effects depend on several...
Tipo: Text
Palavras-chave: Mégafaune benthique; Méthode d'échantillonnage; Impact de la pêche; Sensibilité; Facteurs environnementaux; Bon état écologique; Benthic megafauna; Sampling methods; Fishing impact; Sensitivity; Natural drivers; Good environmental status.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00679/79149/81655.pdf

Large-scale distribution of a deep-sea megafauna community along Mediterranean trawlable grounds
Provedor de dados: 5
Autores: Fernandez-arcaya, Ulla; Bitetto, Isabella; Esteban, Antonio; Farriols, M. Teresa; García-ruiz, Cristina; Gil De Sola, Luis; Guijarro, Beatriz; Jadaud, Angelique; Kavadas, Stefanos; Lembo, Giuseppe; Milisenda, Giacomo; Maina, Irida; Petovic, Slavica; Sion, Letizia; Vaz, Sandrine; Massutí, Enric.
The large-scale distribution pattern of megafauna communities along the Mediterranean middle slope was explored. The study was conducted between 500 and 800 m depth where deep-water fishery occurs. Although community studies carried out deeper than 500 m are partly available for some geographic areas, few large-scale comparative studies have been carried out. Within the framework of the MEDITS survey programme, we compared the megafauna community structure in ten geographical sub-areas (GSAs) along the Mediterranean coasts. Additionally, the spatial distribution of fishing was analysed using vessel monitoring by satellite information. Overall, the community showed a significant difference between sub-areas, with a decreasing eastward pattern in abundance...
Tipo: Text
Palavras-chave: Distribution pattern; Fishing impact; Continental slope; Deep sea; Megafauna; Red shrimp; Community.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00489/60051/63328.pdf

A step toward the definition of ecological indicators of the impact of fishing on the fish assemblage of the Abore reef reserve (New Caledonia)
Provedor de dados: 5
Autores: Amand, Marion; Pelletier, Dominique; Ferrari, Jocelyne; Kulbicki, Michel.
Marine Protected Areas (MPA) are often contemplated as a tool for the sustainable management of exploited resources and ecosystem conservation. This paper proposes an approach to establish a statistical diagnostic of the effects of MPAs on fish assemblages, and define corresponding ecological indicators. This requires choosing relevant variables (abundance, diversity, demographic parameters..) and appropriate statistical methods. The study was based on data from the Abore reef Reserve in New Caledonia. Two sets of methods: 1-inferential linear models (ANOVA, GLM): 2- Partial Least Squares (PLS) methods of regression, were used to test the effects of this MPA. PLS enabled us to test simultaneously within a model, density, species richness, biomass and mean...
Tipo: Text
Palavras-chave: New Caledonia; PLS regression; Ecological indicators; Fishing impact; Coral reef; Fish; Marine Protected Areas.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-398.pdf

Modelling the Mediterranean marine ecosystem as a whole: addressing the challenge of complexity
Provedor de dados: 5
Autores: Piroddi, Chiara; Coll, Marta; Steenbeek, Jeroen; Moy, Diego Macias; Christensen, Villy.
An ecosystem modelling approach was used to understand and assess the Mediterranean marine ecosystem structure and function as a whole. In particular, 2 food web models for the 1950s and 2000s were built to investigate: (1) the main structural and functional characteristics of the Mediterranean food web during these 2 time periods; (2) the key species/functional groups and interactions; (3) the role of fisheries and their impact; and (4) the ecosystem properties of the Mediterranean Sea in comparison with other European regional seas. Our results show that small pelagic fishes, mainly European pilchards and anchovies, prevailed in terms of biomasses and catches during both periods. Large pelagic fishes, sharks and medium pelagic fishes played a key role in...
Tipo: Text
Palavras-chave: Ecopath model; Food web; Ecosystem modelling; Network analysis; Fishing impact; Mediterranean Sea.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00626/73838/73681.pdf

The Celtic Sea Through Time and Space: Ecosystem Modeling to Unravel Fishing and Climate Change Impacts on Food-Web Structure and Dynamics
Provedor de dados: 5
Autores: Hernvann, Pierre-yves; Gascuel, Didier; Grüss, Arnaud; Druon, Jean-noël; Kopp, Dorothee; Perez, Ilan; Piroddi, Chiara; Robert, Marianne.
Both trophic structure and biomass flow within marine food webs are influenced by the abiotic environment and anthropogenic stressors such as fishing. The abiotic environment has a large effect on species spatial distribution patterns and productivity and, consequently, spatial co-occurrence between predators and prey, while fishing alters species abundances and food-web structure. In order to disentangle the impacts of the abiotic environment and fishing in the Celtic Sea ecosystem, we developed a spatio-temporal trophic model, specifically an Ecopath with Ecosim with Ecospace model, for the period 1985–2016. In this model, particular attention was paid to the parameterization of the responses of all trophic levels to abiotic environmental changes....
Tipo: Text
Palavras-chave: Celtic Sea; Ecosystem modeling; Habitat model; Environment; Ecopath with Ecosim and Ecospace; Primary production; Fishing impact.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00662/77419/79084.pdf

Evaluation of trawling disturbance on macrobenthic invertebrate communities in the Bay of Biscay, France: Abundance biomass comparison (ABC method)
Provedor de dados: 5
Autores: Vergnon, Rémi; Blanchard, Fabian.
The necessity to move from a traditional fishery management to an ecosystem approach is now acknowledged. Indicators are required to support the development of this approach. For example, community indicators have been proposed to assess the impact of fishing. We tested here the applicability of one such community indicator, the abundance-biomass comparison (ABC method), as a measure of the impact of bottom trawling (years of sampling: 2001 and 2003) on the benthic invertebrates-typically starfishes, crabs, squat lobsters, shrimps and large hard-shelled molluscs-of "Grande Vasiere", a major French fishing zone, in the Bay of Biscay. The ABC method is generally used as an impact indicator for different types of physical, biological and anthropogenic...
Tipo: Text
Palavras-chave: Atlantic Ocean; Inter annual variability; Density; Macrobenthos; ABC method; Fishing impact; Indicator; Bottom trawl survey.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2133.pdf

EcoTroph: a simple model to assess fishery interactions and their impacts on ecosystems
Provedor de dados: 5
Autores: Gasche, Loic; Gascuel, Didier.
The EcoTroph model leaves aside the notion of species, and models the functioning of marine ecosystems as flows of biomass from low to high trophic levels, so as to quantify easily the impacts of fishing at an ecosystem scale. In this paper, based on two case studies we present a new development of the EcoTroph model that is devoted to the analysis of fishery interactions and impacts of fleet segments on ecosystems. First, deriving an EcoTroph model from an Ecopath model of the Guinea ecosystem, the impacts of the artisanal fishery are distinguished from those of the industrial fishery. It appears that these fisheries do not always compete for the same fish groups but that they both strongly impact the ecosystem and moderately impact one another. Then, an...
Tipo: Text
Palavras-chave: Ecopath; Ecosystem modelling; EcoTroph; Fishery interactions; Fishing impact; Guinea; Management scenario; Small pelagics; Southern Benguela.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00138/24970/23123.pdf

Exploring the impacts of fishing and environment on the Celtic Sea ecosystem since 1950
Provedor de dados: 5
Autores: Hernvann, Pierre-yves; Gascuel, Didier.
Analyzing the long-term changes in ecosystems and disentangling the influence of overfishing and environment require historical data integration. Fisheries-independent data are available only since the mid-1980s in the Celtic Sea and thus provide a short-term and truncated vision of fishing impacts. We conducted a catch-based study over the 1950–2015 period. We successively (i) reconstituted catch time-series, including unreported catch estimates, and studied them through a trophic-spectrum approach and ecosystem indicators based on trophic level, size and species diversity; (ii) estimated biomass trends of the main Celtic Sea target species from catch and effort time-series, using production models that detect potential shifts in productivity; and (iii)...
Tipo: Text
Palavras-chave: Fishing impact; Celtic Sea; Catch reconstruction; Biomass production model; Ecosystem regime shifts; Trophic cascade; Fish productivity.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00600/71241/73090.pdf