Guillaume Bal

Muséum National d'Histoire Naturelle

Mitigating the impacts of global warming on wildlife entails four practical steps. First, we need to study how processes of interest vary with temperature. Second, we need to build good temperature scenarios. Third, processes can be forecast accordingly. Only then can we perform the fourth step, testing mitigating measures. While having good temper...

The Atlantic bluefin tuna (ABFT) is a highly prized species of large pelagic fish. Studies of their environmental physiology may improve understanding and management of their populations, but this is difficult for mature adults because of their large size. Biologging of heart rate holds promise in investigating physiological responses to environmen...

Connaître le nombre absolu d'oiseaux dans une population donnée peut sembler secondaire si l'on sait quantifier sa tendance ou décrire son état de conservation. Pourtant, il s'agit d'un paramètre crucial pour évaluer les risques d'extinction ou pour prendre des décisions en termes de politiques de conservation. Une connaissance détaillée de la tail...

Ce document présente un modèle intégré de dynamique de population développé pour la gestion adaptative du grand tétras dans les Pyrénées françaises. Ce modèle comprend deux classes d'âge pour les femelles et trois pour les mâles et inclut cinq sous-populations distinctes. Il couvre la période 2004-2019. Sa structure et son ajustement reposent sur d...

Atlantic bluefin tuna (ABFT) is a migratory species whose exploitation is affected by its migratory behaviour. ABFT can be found the whole year round in the Gulf of Lions (GoL), with the exception of the May/June/July spawning season. The date at which ABFT fishing resumes in the GoL after spawning is variable and affects both the summer longline f...

50 days free download: https://authors.elsevier.com/c/1cGNG,714MghsI . Trials conducted on board industry vessels to test gears or alternative fishing tactics are often adopted to test selectivity measures in the field. A challenge trial was conducted on board an Irish demersal vessel in 2015 to assess the potential of tactical and behavioural chan...

(FREE DOWNLOAD : https://authors.elsevier.com/a/1W-WG15DJ~tXbn). Developing effective conservation plans for at-risk species requires an understanding of the relationship between numbers of breeding adults and their subsequent offspring. In particular, establishing the degree to which density-dependent effects limit population size can be difficult...

This study provides new data on Atlantic salmon Salmo salar life-history traits across France. Using a long-term recreational angling database (1987-2013) covering 34 rivers in three regions (genetic units), a decline in individual length, mass and a delayed adult return to French rivers was reported. Temporal similarities in trait variations betwe...

Pour les espèces migratrices telles que le saumon atlantique (Salmo salar L.), les caractéristiques biométriques ainsi que le calendrier de migration vers les aires de reproduction sont des traits populationnels essentiels pour le fonctionnement des populations et leur gestion. L’évolution à long terme de ces traits populationnels pourrait traduire...

Providing generic and cost effective modelling approaches to reconstruct and forecast freshwater temperature using predictors as air temperature and water discharge is a prerequisite to understanding ecological processes underlying the impact of water temperature and of global warming on continental aquatic ecosystems. Using air temperature as a si...

Allochthony modeling scenarios for juvenile Chinook salmon were assessed with a two end-member Bayesian mixing model and different combinations of terrestrial and aquatic primary carbon sources. In 2011, juvenile Chinook salmon from upstream sites of the Merced River (e.g., Merced River Ranch and Robinson’s restoration reach) were more dependent on...

Understanding whether populations can adapt to new environmental conditions is a major issue in conservation and evolutionary biology. Aquatic organisms are increasingly exposed to environmental changes linked with human activities in river catchments. For instance, the clogging of bottom substratum by fine sediments is observed in many rivers and...

Although spatial structure is known to be of primary importance for species management, the metapopulation structure of anadromous fish populations is rarely considered. This project aims to fill this gap developing a new metapopulation model fitted from individual mark recapture data (PIT, CWT tags) using a Bayesian framework, which allows for the...

The core of the main chapters is in english. Diadromous fishes that make long term migration between freshwater and marine biomes are very sensible to environmental changes. As such they,are interesting models to track changes in the state of aquatic ecosystems in a climate change context. Among them, the Atlantic salmon (Salmo salarL.) is a partic...

A von Bertalanffy growth model for young-of the-year Atlantic salmon Salmo salar in a small French coastal stream was fitted using water temperatures and densities of juvenile salmonids (S. salar and brown trout Salmo trutta) as covariates influencing daily growth rate. The Bayesian framework was used as a template to integrate prior information fr...