Search results for: Mario Lepage

Items from 1 to 20 out of 24 results

article

Fish larvae dynamics in temperate estuaries: A review on processes, patterns and factors that determine recruitment

Elorri Arevalo, Henrique N. Cabral, Bertrand Villeneuve, Carl Possémé, more

Early life stages of fish (eggs and larvae) are particularly vulnerable with mortality rates of up to 99% recorded for a large number of species. High mortality rates result from the limited swimming ability of larvae preventing them from escaping sub‐optimal environmental conditions, predators or low prey density areas. In this context, estuaries are key nursery areas for larval and juvenile fish...

article

Influence of intertidal seascape on the functional structure of fish assemblages: Implications for habitat conservation in estuarine ecosystems

Nils Teichert, Laure Carassou, Yohan Sahraoui, Jérémy Lobry, more

Aquatic Conservation: Marine and Freshwater Ecosystems > 28 > 4 > 798 - 809

Habitat loss and fragmentation remain major threats in estuaries, particularly with respect to the erosion of intertidal areas that provide shelter and food resources for numerous fish species. Improving our understanding of the fauna–intertidal seascape relationship is thus of critical importance. Here, the seascapes of 24 tidal estuaries were compared at multiple spatial scales (from estuary to...

article

Seasonal variations of contamination and exoskeletal malformations in the white shrimps Palaemon longirostris in the Gironde estuary, France

Bérenger Levesque, Jérôme Cachot, Philippe Boët, Mario Lepage, more

Environmental Science and Pollution Research > 2018 > 25 > 23 > 22689- 22701

Since the end of the 1980s, white shrimps (Palaemon longirostris) from the Gironde estuary have exhibited exoskeletal malformations, mainly involving cephalothorax, rostrum, scaphocerites and uropods. An 8-month study was carried out in 2015. Each month, 200 individuals were sampled and examined for exoskeletal malformations. Temporal variations in malformation frequency were noted, particularly during...

article

Environmental drivers of taxonomic, functional and phylogenetic diversity (alpha, beta and gamma components) in estuarine fish communities

Nils Teichert, Mario Lepage, Xavier Chevillot, Jérémy Lobry

Journal of Biogeography > 45 > 2 > 406 - 417

Aim We applied a diversity partitioning approach to identify the influence of multiple environmental factors on taxonomic, functional and phylogenetic diversity of estuarine fish assemblages at different spatial scales. Our aim was to determine (1) how variation in γ‐diversity (estuary scale) is supported by changes in α‐ (local scale) and β‐components (dissimilarity between these two scales) for...

article

Living under stressful conditions: Fish life history strategies across environmental gradients in estuaries

Nils Teichert, Stéphanie Pasquaud, Angel Borja, Guillem Chust, more

Estuarine, Coastal and Shelf Science > 2017 > 188 > C > 18-26

The life history strategies of fishes can be defined by specific combinations of demographic traits that influence species performances depending on environmental features. Hence, the constraints imposed by the local conditions restrict the range of successful strategies by excluding species poorly adapted. In the present study, we compared the demographic strategies of fish caught in 47 estuaries...

article

An approach to intercalibrate ecological classification tools using fish in transitional water of the North East Atlantic

Mario Lepage, Trevor Harrison, Jan Breine, Henrique Cabral, more

Ecological Indicators > 2016 > 67 > C > 318-327

A simple procedure to harmonise and intercalibrate eight national methods classifying the ecological status using fish in transitional waters of the North East Atlantic is described. These methods were initially intercalibrated and a new method recently developed was added to this exercise. A common human pressure index pre-classified the status of each water body in an independent way. Ecological...

chapter

Habitat, Movements and Feeding of Juvenile European Sturgeon (Acipenser sturio) in Gironde Estuary

Laurent Brosse, Catherine Taverny, Mario Lepage

Biology and Conservation of the European SturgeonAcipenser sturioL. 1758 > Biology, History, Geographical Distribution and Status, from Past to Present > 153-163

This work identifies and characterizes the zones of essential habitats for juveniles of Acipenser sturio in the Gironde estuary. It is also attempts to identify the reasons for sturgeons’ preferential habitat utilization. For this purpose, results from monthly surveys in the Gironde estuary carried out between 1995 and 2000, as well as telemetric surveys of 16 sturgeons in 1999, are used. Additionally,...

chapter

Sturgeon Recovery Plan in the Rhône River (France): Preliminary Results on Species Determination and Habitat Suitability

Laurent Brosse, Patrick Berrebi, Nathalie Desse-Berset, Mario Lepage

Fish & Fisheries Series > Biology, Conservation and Sustainable Development of Sturgeons > Recovery and Conservation > 403-421

Sturgeons were living in the Rhône River (France) until their complete extirpation in the mid 1970s. They disappeared without a certainty about species identity and about sympatry between Acipenser sturio and Acipenser naccarii, as occurred in the Po and Guadalquivir rivers. Preliminary studies were launched in 2005 by the Migrateurs Rhône Méditerranée (MRM) association to overcome this lack of knowledge...

article

Restoring fish ecological quality in estuaries: Implication of interactive and cumulative effects among anthropogenic stressors

Nils Teichert, Angel Borja, Guillem Chust, Ainhize Uriarte, more

Science of The Total Environment > 2016 > 542 > PA > 383-393

Estuaries are subjected to multiple anthropogenic stressors, which have additive, antagonistic or synergistic effects. Current challenges include the use of large databases of biological monitoring surveys (e.g. the European Water Framework Directive) to help environmental managers prioritizing restoration measures. This study investigated the impact of nine stressor categories on the fish ecological...

article

Dynamics of coarse particulate matter in the turbidity maximum zone of the Gironde Estuary

Ana Fuentes-Cid, Henri Etcheber, Sabine Schmidt, Gwenaël Abril, more

Comptes rendus - Geoscience > 2014 > 346 > 1-2 > 28-36

There is a lack of studies devoted to coarse particulate matter (CPM) in estuaries, although this fraction can disturb activities that filter large volumes of water, such as industrial or fishery activities. In the macrotidal and highly-turbid Gironde Estuary, a monthly sampling of CPM was performed in 2011 and 2013 at two stations in the Turbidity Maximum Zone (TMZ) to understand its seasonal, tidal...

article

Strength and time lag of relationships between human pressures and fish-based metrics used to assess ecological quality of estuarine systems

Stéphanie Pasquaud, Anne Courrat, Vanessa F. Fonseca, Rita Gamito, more

Estuarine, Coastal and Shelf Science > 2013 > 134 > Complete > 119-127

Fish-based multi-metric indices have been widely developed in ecological quality assessments of estuaries in the past few years, but the ability of these indices and their respective metrics to respond to human pressures may be quite different. Based on a group consensus approach eliciting information from multiple experts integrating published literature, this work evaluated the strength and time-lag...

article

Estuarine and Lagoon Ecosystem Trajectories

Mario Lepage

Estuarine, Coastal and Shelf Science > 2013 > 134 > Complete > 117-118

article

Influence of sampling effort on metrics of fish-based indices for the assessment of estuarine ecological quality

Rita Gamito, Stéphanie Pasquaud, Anne Courrat, Hilaire Drouineau, more

Ecological Indicators > 2012 > 23 > Complete > 9-18

Multimetric fish-based indices have been increasingly gaining importance in Europe, as the Water Framework Directive (WFD) requires fish fauna, and particularly its composition and abundance, to be taken into account in the assessment of the ecological quality of continental surface waters, including transitional waters. These indices are composed of several metrics, mostly related with structural...

article

Current developments on fish-based indices to assess ecological-quality status of estuaries and lagoons

Rafael Pérez-Domínguez, Stefano Maci, Anne Courrat, Mario Lepage, more

Ecological Indicators > 2012 > 23 > Complete > 34-45

Estuaries and lagoons are especially affected by anthropogenic pressures. This has resulted in symptoms of degradation including water quality impairment and loss of aquatic biota. Protection of aquatic biodiversity and management of these coastal systems require robust tools to assess habitat integrity. Fish populations have been extensively used to define habitat integrity in freshwater systems...

article

Impact of the sampling protocol in assessing ecological trends in an estuarine ecosystem: The empirical example of the Gironde estuary

Stéphanie Pasquaud, Anik Brind’Amour, Olivier Berthelé, Michel Girardin, more

Ecological Indicators > 2012 > 15 > 1 > 18-29

In view of the European Union (EU) requirements to diagnose and monitor the ecological status of estuarine ecosystems using fish-based indicators, we assessed the effect of the sampling protocol in meeting these objectives. Using three different sampling surveys, we evaluated the impact of four components, i.e. sampling gear, spatial extent, length of time series and temporal window analysed, on the...

article

From shallow to deep waters: habitats used by larval lampreys (genus Petromyzon and Lampetra) over a western European basin

Catherine Taverny, Géraldine Lassalle, Isabelle Ortusi, Charles Roqueplo, more

Ecology of Freshwater Fish > 21 > 1 > 87 - 99

Abstract – Habitat requirements of lamprey ammocoetes (Petromyzon marinus and Lampetra genus) were investigated, for the first time, from shallow to deep waters, at different spatial scales across the Gironde‐Dordogne continuum, thanks to a water suction dredge. Fish‐habitat relationships were assessed through two complementary statistical analyses: habitat‐use curves and habitat suitability models...

article

Organochlorine pesticides, polychlorinated biphenyls and trace elements in wild European sea bass (Dicentrarchus labrax) off European estuaries

Joseph G. Schnitzler, Jean Pierre Thomé, Mario Lepage, Krishna Das

Science of the Total Environment > 2011 > 409 > 19 > 3680-3686

Polychlorinated biphenyls (PCBs) and organochlorine pesticides like dichloro-diphenyl-trichloroethane (DDTs), hexachlorocyclohexanes (HCHs), aldrin, dieldrin and trace elements (Cd, Cu, Se, Pb, Zn and Hg) were analysed in the muscle of European sea bass (Dicentrarchus labrax) sampled in Atlantic coastal regions near several important European river mouths (Gironde, Charente, Loire, Seine and Scheldt)...

article

Fish under influence: A macroecological analysis of relations between fish species richness and environmental gradients among European tidal estuaries

Delphine Nicolas, Jérémy Lobry, Mario Lepage, Benoît Sautour, more

Estuarine, Coastal and Shelf Science > 2010 > 86 > 1 > 137-147

Estuarine fish assemblages are subject to a great environmental variability that largely depends on both upstream fluvial and downstream marine influences. From this ecohydrological view, our study introduces a macroecological approach aiming to identify the main environmental factors that structure fish assemblages among European tidal estuaries. The present paper focuses on the influence of large-scale...

article

Fish composition and assemblage structure in three Eastern English Channel macrotidal estuaries: A comparison with other French estuaries

Jonathan Selleslagh, Rachid Amara, Pascal Laffargue, Sandric Lesourd, more

Estuarine, Coastal and Shelf Science > 2009 > 81 > 2 > 149-159

This study has analysed for the first time fish composition and assemblage structures of three small macrotidal estuaries of the Eastern English Channel (EEC) and has explored the influences of 19 biotic and abiotic variables on the fish assemblages. Fish from Canche, Authie and Somme estuaries were collected during spring (June 2006 and May 2007) and autumn (September 2006) along the estuarine gradients...

article

From seasonal patterns to a reference situation in an estuarine environment: Example of the small fish and shrimp fauna of the Gironde estuary (SW France)

Jérémy Lobry, Mario Lepage, Eric Rochard

Estuarine, Coastal and Shelf Science > 2006 > 70 > 1-2 > 239-250

Detecting changes in animal communities suggests that a reference situation exists. It is a particularly difficult task in estuarine environments that are complex and fluctuate with time. Effects of human pressures are difficult to assess due to the scarcity or even the lack of evaluation and monitoring systems. In order to detect anomalies in the functioning of the system and to identify effects...

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INFONA - science communication portal

Search results for: Mario Lepage

Fish larvae dynamics in temperate estuaries: A review on processes, patterns and factors that determine recruitment

Influence of intertidal seascape on the functional structure of fish assemblages: Implications for habitat conservation in estuarine ecosystems

Seasonal variations of contamination and exoskeletal malformations in the white shrimps Palaemon longirostris in the Gironde estuary, France

Environmental drivers of taxonomic, functional and phylogenetic diversity (alpha, beta and gamma components) in estuarine fish communities

Living under stressful conditions: Fish life history strategies across environmental gradients in estuaries

An approach to intercalibrate ecological classification tools using fish in transitional water of the North East Atlantic

Habitat, Movements and Feeding of Juvenile European Sturgeon (Acipenser sturio) in Gironde Estuary

Sturgeon Recovery Plan in the Rhône River (France): Preliminary Results on Species Determination and Habitat Suitability

Restoring fish ecological quality in estuaries: Implication of interactive and cumulative effects among anthropogenic stressors

Dynamics of coarse particulate matter in the turbidity maximum zone of the Gironde Estuary

Strength and time lag of relationships between human pressures and fish-based metrics used to assess ecological quality of estuarine systems

Estuarine and Lagoon Ecosystem Trajectories

Influence of sampling effort on metrics of fish-based indices for the assessment of estuarine ecological quality

Current developments on fish-based indices to assess ecological-quality status of estuaries and lagoons

Impact of the sampling protocol in assessing ecological trends in an estuarine ecosystem: The empirical example of the Gironde estuary

From shallow to deep waters: habitats used by larval lampreys (genus Petromyzon and Lampetra) over a western European basin

Organochlorine pesticides, polychlorinated biphenyls and trace elements in wild European sea bass (Dicentrarchus labrax) off European estuaries

Fish under influence: A macroecological analysis of relations between fish species richness and environmental gradients among European tidal estuaries

Fish composition and assemblage structure in three Eastern English Channel macrotidal estuaries: A comparison with other French estuaries

From seasonal patterns to a reference situation in an estuarine environment: Example of the small fish and shrimp fauna of the Gironde estuary (SW France)

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