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Analyse des déterminants environnementaux de la variabilité du recrutement - approche macroécologique appliquée aux populations exploitées du Nord-Est Atlantique ArchiMer
Brunel, Thomas.
Recruitment - the number of young fishes that integrate each year the exploitable stock¿ has a central importance for stock dynamics. The high temporal variability in recruitment is a result of the environmental influence on survival during early life stages. Understanding the determinism of the influence of environment on recruitment remains one of the most important question in fisheries ecology. The present work aimed at answering some general questions about the influence of environment on fish recruitment using a macroecological approach. The study focused on the exploited fish populations of the Northeastern Atlantic. The first chapter of the thesis makes a review of the different methods used to estimate recruitment, compares recruitment estimates...
Tipo: Text Palavras-chave: Time series; Recruitment variability; Regime shift; Recruitment synchrony; North East Atlantic; NAO; Long term trends; Environmental influence; Effect of temperature; Effect of fishing; Climate change; Biogeography; Variabilité du recrutement; Synchronisme; Séries chronologiques; Tendances à long terme; NAO; Influence de l'environnement; Effet de la température; Effet de la pêche; Changement de régime; Changement climatique; Biogéographie; Atlantique Nord Est.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/these-1113.pdf
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Can we detect the effects of environmental variations on fish populations through VPA outputs? the North Atlantic albacore case ArchiMer
Kell, Laurence T; Fromentin, Jean-marc; Ortiz De Zarate, Victoria; Arrizabalaga, Haritz.
Past studies have indicated that numbers-at-age 1 of albacore may be correlated with the winter NAO index in the previous year. Two main hypotheses have been stressed to explain such observation, i.e. an impact of the NAO on the recruitment or on migration patterns and consequently in the availability and catchability of specific age classes to the surface fishery. The objective of the present paper is to test whether such processes can be distinguished using VPA outputs. We first computed simple cross-correlations between the NAO at various lags, catches-at-age, Numbers-atage and F-at-age estimated in the last assessment. Since results were inconclusive, simulations were undertaken. The results showed that the probability of detecting spurious...
Tipo: Text Palavras-chave: Thunnus alalunga; North Atlantic Oscillation; Simulation model; Virtual population analysis; Correlation coefficient; NAO.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/00194/30503/28913.pdf
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Long-term fluctuations in bluefin tuna trap catches: are they environmentally driven? ArchiMer
Ravier-mailly, Christelle; Fromentin, Jean-marc.
We tested whether synchronous long-term fluctuations in Atlantic bluefin tuna (Thunnus thynnus) trap catches, collected from the ancestral Mediterranean and Atlantic trap fishery, might be related to environmental changes in NAO and/or in temperature. Spectral analyses of trap catches and temperature displayed similar spectra with peak at low frequency whereas those of the NAO exhibited a broad band spectrum. Regression analyses and tests of correlation did not reveal any clear relationship between trap catches and NAO. In contrast, long-term fluctuations in trap catches appear to be negatively and significantly related to long-term trends in temperature. Underlying processes that could explain such a relationship are discussed, with special focus on...
Tipo: Text Palavras-chave: Thunnus thynnus; NAO; Temperature; Trap fishery; Migration.
Ano: 2003 URL: http://archimer.ifremer.fr/doc/00194/30530/28940.pdf
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Observations and Predictions of Wave Runup, Extreme Water Levels, and Medium-Term Dune Erosion during Storm Conditions ArchiMer
Suanez, Serge; Cancouet, Romain; Floc'H, France; Blaise, Emmanuel; Ardhuin, Fabrice; Filipot, Jean-francois; Cariolet, Jean-marie; Delacourt, Christophe.
Monitoring of dune erosion and accretion on the high-energy macrotidal Vougot beach in North Brittany (France) over the past decade (2004–2014) has revealed significant morphological changes. Dune toe erosion/accretion records have been compared with extreme water level measurements, defined as the sum of (i) astronomic tide; (ii) storm surge; and (iii) vertical wave runup. Runup parameterization was conducted using swash limits, beach profiles, and hydrodynamic (Hm0, Tm0,–1, and high tide water level—HTWL) data sets obtained from high frequency field surveys. The aim was to quantify in-situ environmental conditions and dimensional swash parameters for the best calibration of Battjes [1] runup formula. In addition, an empirical equation based on observed...
Tipo: Text Palavras-chave: Macrotidal beach; Runup; Storm; Dune; Erosion; Extreme water level; NAO.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00276/38765/37306.pdf
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Oceanic control of multidecadal variability in an idealized coupled GCM ArchiMer
Jamet, Quentin; Huck, Thierry; Arzel, Olivier; Campin, Jean-michel; De Verdiere, Alain Colin.
Idealized ocean models are known to develop intrinsic multidecadal oscillations of the meridional overturning circulation (MOC). Here we explore the role of ocean–atmosphere interactions on this low-frequency variability. We use a coupled ocean–atmosphere model set up in a flat-bottom aquaplanet geometry with two meridional boundaries. The model is run at three different horizontal resolutions (4°, 2° and 1°) in both the ocean and atmosphere. At all resolutions, the MOC exhibits spontaneous variability on multidecadal timescales in the range 30–40 years, associated with the propagation of large-scale baroclinic Rossby waves across the Atlantic-like basin. The unstable region of growth of these waves through the long wave limit of baroclinic instability...
Tipo: Text Palavras-chave: Atlantic multidecadal oscillation; Air-sea interactions; NAO; Rossby waves; Idealized configuration.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00334/44483/44197.pdf
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