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Bayesian posterior prediction of the patchy spatial distributions of small pelagic fish in regions of suitable habitat ArchiMer
Boyd, Charlotte; Woillez, Mathieu; Bertrand, Sophie; Castillo, Ramiro; Bertrand, Arnaud; Punt, Andre E..
Small pelagic fish aggregate within areas of suitable habitat to form patchy distributions with localized peaks in abundance. This presents challenges for geostatistical methods designed to investigate the processes underpinning the spatial distribution of stocks and simulate distributions for further analysis. In two-stage models, presence/absence is treated as separable and independent from the process explaining non-zero densities. This is appropriate where gaps in the distribution are attributable to one process and conditional abundance to another, but less so where patchiness is attributable primarily to the strong schooling tendencies of small pelagic fish within suitable habitat. We therefore developed a new modelling framework based on a truncated...
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Ano: 2015 URL: https://archimer.ifremer.fr/doc/00222/33367/31773.pdf
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Density dependence, prey accessibility and prey depletion by fisheries drive Peruvian seabird population dynamics ArchiMer
Barbraud, Christophe; Bertrand, Arnaud; Bouchon, Marilu; Chaigneau, Alexis; Delord, Karine; Demarcq, Herve; Gimenez, Olivier; Gutierrez Torero, Mariano; Gutierrez, Dimitri; Oliveros Ramos, Ricardo; Passuni, Giannina; Tremblay, Yann; Bertrand, Sophie.
In marine ecosystems top predator populations are shaped by environmental factors affecting their prey abundance. Coupling top predators' population studies with independent records of prey abundance suggests that prey fluctuations affect fecundity parameters and abundance of their predators. However, prey may be abundant but inaccessible to their predators and a major challenge is to determine the relative importance of prey accessibility in shaping seabird populations. In addition, disentangling the effects of prey abundance and accessibility from the effects of prey removal by fisheries, while accounting for density dependence, remains challenging for marine top predators. Here, we investigate how climate, population density, and the accessibility and...
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00450/56117/57647.pdf
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Evolution de Caulerpa taxifolia devant les côtes des Alpes Maritimes et de la principauté de Monaco. Observations par vidéo-tractée (mars et octobre 1992) ArchiMer
Belsher, Thomas; Youenou, Gilles; Dimeet, Joel; Raillard, Jean-michel; Bertrand, Sophie; Mereau, N..
Deux campagnes océanographiques, menées à partir du N.O. "Roselys 2", au cours de l'année 1992, ont permis d'établir la cartographie de l'algue Caulerps taxifolia pour plusieurs secteurs des côtes des Alpes Maritimes et de la Principauté de Monaco. Des survols, effectués à bord de l'hélicoptère des Douanes, ont précédé chacune de ces campagnes. L'expansion rapide de l'algue, ses capacités de fixation à grande profondeur, ainsi que d'importantes variations saisonnières ont pu ainsi être mises en évidence.
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Ano: 1993 URL: http://archimer.ifremer.fr/doc/00105/21611/19191.pdf
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Evolution de Caulerpa taxifolia devant les côtes des Alpes Maritimes et la Principauté de Monanco - Observations par vidéo-tractée (mars et octobre 1992) ArchiMer
Belsher, Thomas; Youenou, Gilles; Dimeet, Joel; Raillard, Jean-michel; Bertrand, Sophie; Mereau, N.
Deux campagnes océanographiques, menées à partir du N.O. "Roselys 2", au cours de l'année 1992, ont permis d'établir la cartographie de l'algue Caulerpa taxifolia pour plusieurs secteurs des côtes des Alpes Maritimes et de la Principauté de Monaco. Des survols, effectués à bord de l'hélicoptère des Douanes, ont précédé chacune de ces campagnes. L'expansion rapide de l'algue, ses capacités de fixation à grande profondeur, ainsi que d'importantes variations saisonnières ont pu ainsi être mises en évidence.
Tipo: Text
Ano: 1993 URL: http://archimer.ifremer.fr/doc/00104/21561/19141.pdf
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Reference points for predators will progress ecosystem‐based management of fisheries ArchiMer
Hill, Simeon L.; Hinke, Jefferson; Bertrand, Sophie; Fritz, Lowell; Furness, Robert W.; Ianelli, James N.; Murphy, Matthew; Oliveros‐ramos, Ricardo; Pichegru, Lorien; Sharp, Rowland; Stillman, Richard A.; Wright, Peter J.; Ratcliffe, Norman.
Ecosystem‐based management of fisheries aims to allow sustainable use of fished stocks while keeping impacts upon ecosystems within safe ecological limits. Both the FAO Code of Conduct for Responsible Fisheries and the Aichi Biodiversity Targets promote these aims. We evaluate implementation of ecosystem‐based management in six case‐study fisheries in which potential indirect impacts upon bird or mammal predators of fished stocks are well publicized and well studied. In particular, we consider the components needed to enable management strategies to respond to information from predator monitoring. Although such information is available in all case‐studies, only one has a reference point defining safe ecological limits for predators and none has a method to...
Tipo: Text Palavras-chave: Adaptive management; Aichi Biodiversity Targets; Ecosystem interactions; Indirect impacts; Management strategy; Precautionary approach.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00602/71400/69850.pdf
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Statistical ecology comes of age ArchiMer
Gimenez, Olivier; Buckland, Stephen T.; Morgan, Byron J. T.; Bez, Nicolas; Bertrand, Sophie; Choquet, Remi; Dray, Stephane; Etienne, Marie-pierre; Fewster, Rachel; Gosselin, Frederic; Merigot, Bastien; Monestiez, Pascal; Morales, Juan M.; Mortier, Frederic; Munoz, Francois; Ovaskainen, Otso; Pavoine, Sandrine; Pradel, Roger; Schurr, Frank M.; Thomas, Len; Thuiller, Wilfried; Trenkel, Verena; De Valpine, Perry; Rexstad, Eric.
The desire to predict the consequences of global environmental change has been the driver towards more realistic models embracing the variability and uncertainties inherent in ecology. Statistical ecology has gelled over the past decade as a discipline that moves away from describing patterns towards modelling the ecological processes that generate these patterns. Following the fourth International Statistical Ecology Conference (1–4 July 2014) in Montpellier, France, we analyse current trends in statistical ecology. Important advances in the analysis of individual movement, and in the modelling of population dynamics and species distributions, are made possible by the increasing use of hierarchical and hidden process models. Exciting research perspectives...
Tipo: Text Palavras-chave: Citizen science; Hidden Markov model; Hierarchical model; Movement ecology; Software package; Spatially explicit capture-recapture; Species distribution modelling; State-space model.
Ano: 2014 URL: https://archimer.ifremer.fr/doc/00249/36026/35298.pdf
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