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Registros recuperados: 10
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A new application of principal response curves for summarizing abrupt and cyclic shifts of communities over space ArchiMer
Auber, Arnaud; Travers-trolet, Morgane; Villanueva, Ching-maria; Ernande, Bruno.
There is a growing need to easily describe and synthesize the dynamics of ecosystems’ components in space and time. Most multivariate analyses provide ordination diagrams or biplots that are too cluttered to allow simple reading and are unfamiliar to most users. To overcome such difficulties, a novel application of principal response curves (PRCs) is proposed. Principal response curves are traditionally used to assess treatment effects on community structure measured repeatedly over time. In this new application, the tested factor and the repeated-observation axis are replaced by time and space, respectively. The georeferencing of sampling sites permits to produce an easy-to-read map that summarizes both the temporal dynamics of the community and the...
Tipo: Text Palavras-chave: Fish communities; Multivariate analyses; Partial redundancy analysis; Spatial management tools; Spatio-temporal dynamics.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00413/52478/53266.pdf
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Decline of cold-water fish species in the Bay of Somme (English Channel, France) in response to ocean warming ArchiMer
Auber, Arnaud; Gohin, Francis; Goascoz, Nicolas; Schlaich, Ivan.
A growing number of studies have documented increasing dominance of warm-water fish species (“tropicalisation”) in response to ocean warming. Such reorganization of communities is starting to occur in a multitude of local ecosystems, implying that tropicalisation of marine communities could become a global phenomenon. Using 32 years of trawl surveys in the Bay of Somme (English Channel, France), we aimed to investigate the existence of a tropicalisation in the fish community at the local scale of the estuary during the mid-1990s, a period where an exceptional temperature rise occurred in Northeast Atlantic. A long-term response occurred (with a major transition over 6 years) that was characterized by a marked diminution in the abundance of cold-water...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00374/48551/48873.pdf
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Ecological and life history traits explain a climate induced shift in a temperate marine fish community ArchiMer
Mclean, Matthew; Mouillot, David; Auber, Arnaud.
A better understanding of community dynamics and ecosystem functioning can be achieved by describing how community functional structure responds to environmental change over both time and space and by identifying which functional groups best mediate community responses. Here, we used a trait-based approach in combination with a newly developed application of principal response curves to functionally characterize a rapid taxonomic shift in the eastern English Channel fish community in the late 1990s. We identified the functional groups with the greatest contributions to the overall shift in fish functional structure and uncovered significant trait−environment relationships. We found that pelagic species with rapid life history cycles, characterized by...
Tipo: Text Palavras-chave: Atlantic Multidecadal Oscillation; Climate warming; English Channel; Functional ecology; Principal response curves; Response traits.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00467/57882/60366.pdf
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Functional reorganization of marine fish nurseries under climate warming ArchiMer
Mclean, Matthew J.; Mouillot, David; Goascoz, Nicolas; Schlaich, Ivan; Auber, Arnaud.
While climate change is rapidly impacting marine species and ecosystems worldwide, the effects of climate warming on coastal fish nurseries have received little attention despite nurseries’ fundamental roles in recruitment and population replenishment. Here, we used a 26‐year time series (1987–2012) of fish monitoring in the Bay of Somme, a nursery in the Eastern English Channel (EEC), to examine the impacts of environmental and human drivers on the spatial and temporal dynamics of fish functional structure during a warming phase of the Atlantic Multidecadal Oscillation (AMO). We found that the nursery was initially dominated by fishes with r‐selected life‐history traits such as low trophic level, low age and size at maturity, and small offspring, which...
Tipo: Text Palavras-chave: Atlantic Multidecadal Oscillation; Climate change; Ecosystem function; English Channel; Fisheries; Functional traits; Life history; Recruitment.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00471/58276/60818.pdf
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Integration and sharing of data on marine ecosystems. ArchiMer
Auber, Arnaud; Delpech, Jean-paul.
Integration and data sharing on marine ecosystem constitute two major contributors to ecosystem management. In this report, we present the different methods that have been used to integrate and share data in the context of Interreg IVA France (Channel) – England projects. Identification of limits and barriers encountered within these projects may help to improve our capacity to lead future projects, notably those involved in marine ecosystem management.
Tipo: Text Palavras-chave: Accessibility; Data sharing; Quality of work; Reports; Websites.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00217/32848/31315.pdf
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International Bottom Trawl Survey (IBTS2019-Q1). French cruise report ArchiMer
Lazard, Coline; Verin, Yves; Auber, Arnaud.
IBTS surveys (International Bottom Trawl Survey) are carried out within an international framework. Main countries bordering the North Sea participate to it according to the European Community regulations (EC N°1543/2000 and N° 1639/2001) which specify that countries from E.U. have to carry out surveys at sea in order to evaluate abundance and stocks distribution, independently of commercial fisheries data. The first target of the IBTS survey is to have a diagnosis on the main commercial fish stock and to calculate abundances index by age for these species. This survey started in the years 70’s and gradually standardised. Since the years 80’s, a common protocol is implemented and used by all participants. The same fishing gear and the same working methods...
Tipo: Text Palavras-chave: North sea; GOV; Beam trawl; MIK; Abundance; Stock assessment.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00507/61899/65990.pdf
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Regime Shift in an Exploited Fish Community Related to Natural Climate Oscillations ArchiMer
Auber, Arnaud; Travers-trolet, Morgane; Villanueva, Ching-maria; Ernande, Bruno.
Identifying the various drivers of marine ecosystem regime shifts and disentangling their respective influence are critical tasks for understanding biodiversity dynamics and properly managing exploited living resources such as marine fish communities. Unfortunately, the mechanisms and forcing factors underlying regime shifts in marine fish communities are still largely unknown although climate forcing and anthropogenic pressures such as fishing have been suggested as key determinants. Based on a 24-year-long time-series of scientific surveys monitoring 55 fish and cephalopods species, we report here a rapid and persistent structural change in the exploited fish community of the eastern English Channel from strong to moderate dominance of small-bodied...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00273/38466/36886.pdf
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Relationships among fisheries exploitation, environmental conditions, and ecological indicators across a series of marine ecosystems ArchiMer
Fu, Caihong; Large, Scott; Knight, Ben; Richardson, Anthony J.; Bundy, Alida; Reygondeau, Gabriel; Boldt, Jennifer; Van Der Meeren, Gro I.; Torres, Maria A; Sobrino, Ignacio; Auber, Arnaud; Travers-trolet, Morgane; Piroddi, Chiara; Diallo, Ibrahima; Jouffre, Didier; Mendes, Hugo; Borges, Maria Fatima; Lynam, Christopher P.; Coll, Marta; Shannon, Lynne J.; Shin, Yunne-jai.
Understanding how external pressures impact ecosystem structure and functioning is essential for ecosystem-based approaches to fisheries management. We quantified the relative effects of fisheries exploitation and environmental conditions on ecological indicators derived from two different data sources, fisheries catch data (catch-based) and fisheries independent survey data (survey-based) for 12 marine ecosystems using a partial least squares path modeling approach (PLS-PM). We linked these ecological indicators to the total biomass of the ecosystem. Although the effects of exploitation and environmental conditions differed across the ecosystems, some general results can be drawn from the comparative approach. Interestingly, the PLS-PM analyses showed...
Tipo: Text Palavras-chave: Ecological indicators; Environmental conditions; Fisheries exploitation; Marine ecosystems; Partial least squares path modeling.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00250/36155/34710.pdf
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Trait structure and redundancy determine sensitivity to disturbance in marine fish communities ArchiMer
Mclean, Matthew; Auber, Arnaud; Graham, Nicholas A J; Houk, Peter; Villéger, Sébastien; Violle, Cyrille; Thuiller, Wilfried; Wilson, Shaun K.; Mouillot, David.
‘Functional’ diversity is believed to influence ecosystem dynamics through links between organismal traits and ecosystem processes. Theory predicts that key traits and high trait redundancy – large species richness and abundance supporting the same traits – can buffer communities against environmental disturbances. While experiments and data from simple ecological systems lend support, large‐scale evidence from diverse, natural systems under major disturbance is lacking. Here, using long‐term data from both temperate (English Channel) and tropical (Seychelles Islands) fishes, we show that sensitivity to disturbance depends on communities’ initial trait structure and initial trait redundancy. In both ecosystems, we found that increasing dominance by...
Tipo: Text Palavras-chave: Climate change; Coral reefs; Diversity stability; Ecological traits; Ecosystem functioning; English Channel; Functional diversity.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00490/60184/63525.pdf
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What did we learn from PEGASEAS forum “Science and Governance of the Channel Marine Ecosystem”? ArchiMer
Evariste, Emmanuelle; Claquin, Pascal; Robin, Jean-pierre; Auber, Arnaud; Mcquatters-gollop, Abigail; Fletcher, Stephen; Glegg, Gillian; Dauvin, Jean-claude.
As one of the busiest marine ecosystems in the world, the English Channel is subjected to strong pressures due to the human activities occurring within it. Effective governance is required to improve the combined management of different activities and so secure the benefits provided by the Channel ecosystem. In July 2014, a Cross-Channel Forum, entitled “Science and Governance of the Channel Marine Ecosystem”, was held in Caen (France) as part of the INTERREG project “Promoting Effective Governance of the Channel Ecosystem” (PEGASEAS). Here we use outputs from the Forum as a framework for providing Channel-specific advice and recommendations on marine governance themes, including the identification of knowledge gaps, which may form the foundation of future...
Tipo: Text Palavras-chave: English Channel; Governance; INTERREG programme; Cross-Channel Forum.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00254/36550/35147.pdf
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