Sébastien Rochette

ThinkR

We review and compare four broad categories of spatially-explicit modelling approaches currently used to understand and project changes in the distribution and productivity of living marine resources including: 1) statistical species distribution models, 2) physiology-based, biophysical models of single life stages or the whole life cycle of specie...

Madrepora oculata and Lophelia pertusa are the two main ecosystem engineering, scleractinian cold-water corals (CWC) found in Mediterranean canyons. Factors controlling CWC distribution in the Mediterranean Sea are not yet fully understood in spite of such ecosystems being recognized as sensitive habitats by the General Fisheries Commission for the...

Figure S2. Microtubule bundling persistence 16 h after release of compression in two spr2‐2 GFP–MBD meristems.

Figure S3. Methods used to rescale green intensities values, when exposure was too low, illustrated with GFP–MBD images (see also Experimental Procedures).

Table S1. Wilcoxon rank sum tests P‐values.

Figure S1. Examples of cells pairs from indented meristems extracted from snapshots taken at time zero, i.e. before compression (left cell), and at time 6 h 45, i.e. 15 min after release of compression (right cell).

Figure S4. Examples of analyses performed on compressed meristems in (a) spr2‐2 GFP–MBD; and (b) bot1‐7 GFP–MBD.

Exogenous mechanical perturbations on living tissues are commonly used to investigate whether cell effectors can respond to mechanical cues. However, in most of these experiments, the applied mechanical stress and/or the biological response are described only qualitatively. We developed a quantitative pipeline based on microindentation and image an...

Six different inversion schemes have been assessed for the retrieval of seabed abundances and bathymetry from hyperspectral data in a coral reef context.

Dans le périmètre du parc naturel marin d'Iroise, le champ d'algues brunes de l'archipel de Molène est le plus diversifié d'Europe et le plus étendu des côtes françaises. Cet habitat structurant est remarquable pour sa productivité et la forte biodiversité associée. L'enjeu de conservation de cet habitat doit tenir compte et intégrer l'exploitation...

The Molène Archipelago in Brittany (France) hosts one of the largest kelp forests in Europe. Beyond their recognized ecological importance as an essential habitat and food for a variety of marine species, kelp also contributes towards regional economies by means of the alginate industry. Thousands of tons of kelp are collected each year for the nee...

In the last few decades, there has been a marked decline in the number of shad (Alosa alosa and A. fallax) landed in France, which prompted the French committee of the International Union for Conservation of Nature to list shad as a ‘Vulnerable’ species in 2010. The freshwater phases of shad life cycles have been extensively studied, but the marine...

In the last few decades, there has been a marked decline in the number of shad (Alosa alosa and A. fallax) landed in France, which prompted the French committee of the International Union for Conservation of Nature to list shad as a ‘Vulnerable’ species in 2010. The freshwater phases of shad life cycles have been extensively studied, but the marine...

The North Sea cod (Gadus morhua, L.) stock has continuously declined over the past four decades linked with overfishing and climate change. Changes in stock structure due to overfishing have made the stock largely dependent on its recruitment success, which greatly relies on environmental conditions. Here we focus on the spatio-temporal variability...

Ecosystem models are always simplifications of reality and as such their application for ecosystem-basedmanagement requires standard validation. Here, the "DataReli" toolbox is proposed to evaluate the qualityof the data used during the construction of ecosystem models, their coherence across trophic levels, andwhether data limitations prevent the...

This paper proposes a hierarchical Bayesian framework for modeling the life cycle of marine exploited fish with a spatial perspective. The application was developed for a nursery-dependent fish species, the common sole (Solea solea), on the Eastern Channel population (Western Europe). The approach combined processes of different natures and various...

Mixed beds of Ophiocomina nigra and Ophiothrix fragilis (Echinodermata, Ophiuroidea) are usually predominated by O. fragilis and are reported to be stable over time. The Bay of Brest (Brittany, France) is a highly productive ecosystem where both species co-occur in the main central part. Using a geostatistical approach, we tested for changes in O....

Consequences of human disturbances on sole population in the Eastern Channel.

Use of real abundances, preferential or potential habitats, what differences in conservation plans? An example from the eastern English Channel.

For many marine fish species, recruitment is strongly related to larval survival and dispersal to nursery areas. Simulating larval drift should help assessing the sensitivity of recruitment variability to early life history. An individual-based model (IBM) coupled to a hydrodynamic model was used to simulate common sole larval supply from spawning...

http://halieutique.agrocampus-ouest.fr/projets.php?idproj=57

http://halieutique.agrocampus-ouest.fr/projets.php?idproj=57

A Bayesian state-space model to merge larval drifting and habitat suitability models with spatially ? explicit age-structured fish population dynamics model

Growth and morphometric characteristics of the caridean Palaemon longirostris Milne Edwards, 1837, were studied in the Gironde estuary population. Their first comparison with earlier studies in this estuary and in the Mira River provided the first step towards developing environmental indicators using a species represented at the European scale. Me...

The aim of this paper is to assess the possible contribution of an input-output model towards two of the basic principles of the sustainability strategy of integrated coastal zone management (ICZM) and Post-Normal Science. According to these principles, decision-support tools should offer a holistic perspective and handle high uncertainty. The diff...

Coastal bays provide habitats for juveniles and adults of many marine species. Mont Saint-Michel Bay (MSMB, France) hosts a highly diversified fish community and constitutes one of the most important nursery grounds for many commercially exploited marine species, such as sea bass, flatfish, clupeids and rays in the English Channel. Besides, MSMB al...

Consequences of anthropic disturbances on population of sole in the Eastern Channel

Les pêches maritimes européennes sont en crise, confrontées au triple défi d’une ressource naturelle qui s’épuise, d’un marché mondial qui tire les prix vers le bas et d’un renchérissement des prix de l’énergie. Année après année, la production stagne, le nombre de marins pêcheurs décroît et les navires vieillissent ou sont envoyés à la casse. Lors...

A biophysical model to analyse the influence of larval supply on fish recruitment: application to a coastal and estuarine nursery dependent flatfish population

Estuaries and coastal waters are essential nursery habitats for many marine species, and especially for flatfishes. Thus, investigating how anthropogenic disturbances affect the quality of these habitats is of major importance to understand their consequences on the population renewal of marine species.The aim of the present study was to analyse th...

Studying the functioning of the Gironde ecosystem, we attempt to build tools for management capable to predict its possible trajectories under various human pressure or environmental condition modifications but also capable to point out influent and sensitive components. Computing quantitative models require gathering enough data to implement them,...