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Registros recuperados: 14
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Characterising the temporal variability of the spatial distribution of animals: an application to seabirds at sea ArchiMer
Certain, Gregoire; Bellier, E; Planque, Benjamin; Bretagnolle, V.
Understanding the patterns of spatial and temporal variations in animal abundance is a fundamental question in ecology. Here, we propose a method to quantify temporal variations in animal spatial patterns and to determine the spatial scale at which such temporal variability is expressed. The methodology extends from the approach proposed by Taylor (Taylor, L. R. 1961. Aggregation, variance and the mean. Nature 189: 732-735) and relies on models of the relationship between temporal mean and variance in animal abundance. Repeated observations of the spatial distribution of populations are used to construct spatially explicit models of Taylor's power law. The resulting slope parameters of the Taylor power law provide local measures of the temporal variability...
Tipo: Text Palavras-chave: Temporal variability; Taylor's Power Law; Spatio temporal distribution; Seabirds; Scale dependence; Bay of Biscay.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3523.pdf
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Detecting adverse effect on seabed integrity. Part 1: Generic sensitivity indices to measure the effect of trawling on benthic mega-epifauna ArchiMer
Jac, Cyrielle; Desroy, Nicolas; Certain, Gregoire; Foveau, Aurelie; Labrune, Céline; Vaz, Sandrine.
The benthic fauna of European continental shelves is a severely impacted community, mostly due to intense bottom trawling activity. Trawling effect may be dependent on the spatial and temporal distribution of abrasion, the habitat type including natural perturbation intensity and the fishing gear used. Nonetheless, there is an urgent need to identify or develop indices likely to measure the effect of trawling. For this purpose benthic fauna by-catch monitored in scientific trawl surveys carried out in all European waters in the frame of the Common Fishery Policy Data Collection Multiannual Program may be used. Benthic invertebrates data used in this study were collected during scientific bottom trawl surveys covering the English Channel, the North Sea and...
Tipo: Text Palavras-chave: Benthic sensitivity; Trawling effect; Indices; Seabed integrity; MSFD.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00635/74693/74606.pdf
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Detecting adverse effect on seabed integrity. Part 2: How much of seabed habitats are left in good environmental status by fisheries? ArchiMer
Jac, Cyrielle; Desroy, Nicolas; Certain, Gregoire; Foveau, Aurelie; Labrune, Céline; Vaz, Sandrine.
By relating observed changes to the pressures suffered, the Marine Strategy Framework Directive intends to better control the factors of environmental degradation and to manage their consequences in European waters. Several descriptors are defined within the framework of the MFSD and in particular descriptor 1 relating to the biological diversity of the seabed and descriptor 6 relating to the seabed integrity (i.e. the quality of their structures and functions). For each descriptor, indicators and threshold values must be defined and a novel conceptual approach to define and detect seabed integrity thresholds is proposed here. Bottom trawling being the main source of shelf continental disturbance, it is important to evaluate its impact on benthic habitat....
Tipo: Text Palavras-chave: GES; Threshold values; Trawling impact; Indices; MFSD.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00634/74575/74464.pdf
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How do MAR(1) models cope with hidden nonlinearities in ecological dynamics? ArchiMer
Certain, Gregoire; Barraquand, Frederic; Gardmark, Anna.
1.Multivariate autoregressive (MAR) models are an increasingly popular technique to infer interaction strengths between species in a community and to predict the community response to environmental change. The most commonly employed MAR(1) models, with one time lag, can be viewed either as multispecies competition models with Gompertz density‐dependence or, more generally, as a linear approximation of more complex, nonlinear dynamics around stable equilibria. This latter interpretation allows for broader applicability, but may come at a cost in terms of interpretation of estimates and reliability of both short‐ and long‐term predictions. 2.We investigate what these costs might be by fitting MAR(1) models to simulated two‐species competition,...
Tipo: Text Palavras-chave: Forecasting; Interaction strength; MARSS; Multivariate autoregressive models; PRESS perturbation.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00439/55085/56521.pdf
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Identification de la période la plus pertinente pour l'interdiction de 3 mois chaque année, de la pêche au chalut jusqu'à 6 milles marins de la côte en Corse (GSA 8) ArchiMer
Jadaud, Angelique; Billet, Norbert; Bourjea, Jerome; Certain, Gregoire; Biseau, Alain.
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00585/69668/67536.pdf
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Identification de la période la plus pertinente pour l’interdiction de 3 mois chaque année, de la pêche au chalut jusqu’à 6 milles marins de la côte en mer Méditerranée ArchiMer
Bourjea, Jerome; Billet, Norbert; Certain, Gregoire; Jadaud, Angelique; Vaz, Sandrine.
Tipo: Text
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00506/61726/65701.pdf
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Identification d’une fermeture spatio-temporelle en Méditerranée occidentale française (GSA7) ayant pour objectif une diminution de 20% des captures de juvéniles de merlu (Merluccius merluccius) ArchiMer
Bourjea, Jerome; Billet, Norbert; Certain, Gregoire; Jadaud, Angelique; Biseau, Alain.
Tipo: Text
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00585/69667/67532.pdf
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Investigation of spatiotemporal patterns in mean temperature and mean trophic level of MEDITS survey catches in the Mediterranean Sea ArchiMer
Peristeraki, Panagiota; Bitetto, Isabella; Carbonara, Pierluigi; Carlucci, Roberto; Certain, Gregoire; De Carlo, Francesco; Gristina, Michele; Kamidis, Nikos; Pesci, Paola; Stagioni, Marco; Valls, María; Tserpes, George.
Mean temperature (MTC) and mean trophic level (MTL) spatiotemporal patterns of MEDITS survey catches were examined in 13 geographic statistical areas (GSAs) of the Mediterranean between 1994 and 2016. The study aimed to detect changes in the demersal community structure related to anthropogenic impacts. A generalized additive modelling approach was used to examine the effects of year and GSA on the MTC and MTL indexes and on bottom temperature by haul. For the MTC index, the year was significant only in 4 GSAs, while for MTL it was significant in 5. Higher MTC values were observed in central and eastern areas. Bottom temperature increased after 2010, and also from west to east and from north to south. Our results indicate that the recently observed...
Tipo: Text Palavras-chave: Mean temperature of the catch; Trophic level; Bottom temperature; Trends; Mediterranean; Fishing pressure; Sea warming; Climate change.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00489/60054/63332.pdf
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Lower trophic levels and detrital biomass control the Bay of Biscay continental shelf food web: Implications for ecosystem management ArchiMer
Lassalle, G.; Lobry, J.; Le Loc'H, F.; Bustamante, Paco; Certain, Gregoire; Delmas, Daniel; Dupuy, C.; Hily, Christian; Labry, Claire; Le Pape, O.; Marquis, Elise; Petitgas, Pierre; Pusineri, Claire; Ridoux, Vincent; Spitz, J.; Niquil, Nathalie.
The Bay of Biscay (North-East Atlantic) has long been subjected to intense direct and indirect human activities that lead to the excessive degradation and sometimes overexploitation of natural resources. Fisheries management is gradually moving away from single-species assessments to more holistic, multi-species approaches that better respond to the reality of ecosystem processes. Quantitative modelling methods such as Ecopath with Ecosim can be useful tools for planning, implementing and evaluating ecosystem-based fisheries management strategies. The aim of this study was therefore to model the energy fluxes within the food web of this highly pressured ecosystem and to extract practical information required in the diagnosis of ecosystem state/health. A...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00057/16851/14329.pdf
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Modelling spatio-temporal patterns of fish community size structure across the northern Mediterranean Sea: an analysis combining MEDITS survey data with environmental and anthropogenic drivers ArchiMer
Bitetto, Isabella; Romagnoni, Giovanni; Adamidou, Angeliki; Certain, Gregoire; Di Lorenzo, Manfredi; Donnaloia, Marilena; Lembo, Giuseppe; Maiorano, Porzia; Milisenda, Giacomo; Musumeci, Claudia; Ordines, Francesc; Pesci, Paola; Peristeraki, Panagiota; Pesic, Ana; Sartor, Paolo; Spedicato, Maria Teresa.
The state of marine systems subject to natural or anthropogenic impacts can be generally summarized by suites of ecological indicators carefully selected to avoid redundancy. Length-based indicators capture the status of fish community structure, fulfilling the Marine Strategy Framework Directive (MSFD) requirement for Descriptor 3 (status of commercial fish species). Although the MSFD recommends the development of regional indicators, a comparison among alternative length-based indicators is so far missing for the Mediterranean Sea. Using principal component analysis and dynamic factor analysis, we identified the most effective subset of length-based indicators, whether or not based on maximum length. Indicator trends and time series of fishing effort and...
Tipo: Text Palavras-chave: Demersal fish community; Size structure indicators; Geographical sub-area; Marine Strategy Framework Directive; Dynamic factor analysis; Redundancy analysis.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00599/71148/69466.pdf
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Poissons, céphalopodes et crustacés du Golfe du Lion. Courbes de croissance. Taille et poids. Maturité sexuelle. ArchiMer
Bensebaini, Cyria Meriem; Billet, Norbert; Certain, Gregoire; Jadaud, Angelique; Le Roy, Emilie.
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00505/61688/65656.pdf
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Projet INPOLAG (Indicateur Poisson en Lagunes). Résultats de la première campagne d'Automne 2019 ArchiMer
Motte, Marie; Ouisse, Vincent; Certain, Gregoire.
Afin de répondre aux attentes de la DCE concernant l'évaluation de l'état écologique des masses d'eau de transition dont les lagunes font parties, l'Ifremer pilote le projet INPOLAG (2019-2021). Ce projet a pour objectif de développer un des indicateurs manquants aux exigences de la DCE : l'indicateur "Poisson en lagunes" adapté au contexte français. Pour cela, trois campagnes de terrain sont prévues pour la définition de cet indicateur. Ce rapport fait l'objet de l'analyse de la première campagne de terrain qui s'est déroulée en Automne 2019.
Tipo: Text Palavras-chave: DCE; Indicateur poisson; Masses d'eau de transition; Lagunes; Méditerranée; Senne de plage; Inventaire ichtyologique; Juvéniles de poisson.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00630/74196/73824.pdf
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Suitable habitats of fish species in the Barents Sea ArchiMer
Husson, Berengere; Certain, Gregoire; Filin, Anatoly; Planque, Benjamin.
Many marine species are shifting their distribution poleward in response to climate change. The Barents Sea, as a doorstep to the fast-warming Arctic, is experiencing large scale changes in its environment and its communities. This paper aims at understanding what environmental predictors limit fish species habitats in the Barents Sea and discuss their possible evolution in response to the warming of the Arctic. Species distribution models usually aim at predicting the probability of presence or the average abundance of a species, conditional on environmental drivers. A complementary approach is to determine suitable habitats by modelling the upper limit of a species’ response to environmental factors. Using quantile regressions, we model the upper limit...
Tipo: Text Palavras-chave: Quantile regression; Habitat suitability models; Climate change; Species distribution; Species shifts; Environmental drivers.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00605/71682/70120.pdf
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Suitable habitats of fish species in the Barents Sea ArchiMer
Husson, Berengere; Certain, Gregoire; Filin, Anatoly; Planque, Benjamin.
Many marine species exhibit poleward migrations following climate change. The Barents Sea, a doorstep to the fast‐warming Arctic, is experiencing large scale changes in its environment and its communities. Tracking and anticipating changes for management and conservation purposes at the scale of the ecosystem necessitate quantitative knowledge on individual species distribution drivers. This paper aims at identifying the factors controlling demersal habitats in the Barents Sea, investigating for which species we can predict current and future habitats and inferring those most likely to respond to climate change. We used non‐linear quantile regressions (QGAM) to model the upper quantile of the biomass response of 33 fish species to 10 environmental...
Tipo: Text Palavras-chave: Climate change; Environmental niche; Generalized additive models; Habitat suitability models; Limiting factors; Quantile regression; Species distribution.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00641/75352/76099.pdf
Registros recuperados: 14
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