Stratégies démographiques des poissons des rivières françaises : premiers résultats

Pont, Didier; Allardi, J.; Belliard, Jérôme; Boët, Philippe; Carrel, Georges; Changeux, Thomas; Oberdorff, Thierry; Olivier, Jean-Marc; Persat, H.; Poizat, G.

doi:10.1051/kmae:1995013

Cited by 11 publications

(8 citation statements)

References 7 publications

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“…BOS was log-transformed for analyses. Three reproductive traits were used as estimators of reproductive potential based on data provided by Pont et al (1995): egg diameter (mm), relative fecundity (log of number of eggs/100 g body mass), and maximum breeding lifespan (lifespan minus age at first breeding).…”

Section: Life-history Variablesmentioning

confidence: 99%

Density-range size relationships in French riverine fishes

2004

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We examined the relation between the local density of species and the size of the geographic range for French riverine fishes. As for most other taxonomic groups, a positive interspecific relationship is found for this group. This relationship is robust to the confounding effects of phylogeny and is not a priori a product of other potential mechanistic artefacts. We formally tested two of the principal biological mechanisms already proposed (i.e. the niche breadth hypothesis and the resource availability hypothesis). We found no support for the niche breadth hypothesis. In contrast, we found consistent support for the closely related resource availability hypothesis. Species utilising resources (habitats) that are marginal tend to appear at low density and to have narrow distribution whereas species utilising widespread habitats tend to be more abundant and more widely distributed. Using data on body size and reproductive traits we explored the potential influence of these variables in explaining significant variation around the density-range size relationship. Only body size explains significant variation around the relationship, being negatively correlated with local density and positively correlated with range size.

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Section: Life-history Variablesmentioning

confidence: 99%

Density-range size relationships in French riverine fishes

2004

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“…() for the Upper Rhône River species and the BIOFUN project (Gayraud et al ., ) for species found in large European rivers and was supplemented by a literature search (Falkner et al ., ). For fish species, data were obtained from various sources in the literature (Persat, Olivier & Pont, ; Pont et al ., ; Mann, ; Blanck et al ., ; Sagnes & Statzner, ).…”

Section: Methodsmentioning

confidence: 99%

The generality of changes in the trait composition of fish and invertebrate communities after flow restoration in a large river (French Rhône)

Dolédec

Castella

Forcellini³

et al. 2015

Freshwater Biology

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1. A multiple-trait-based approach can provide predictions and interpretations of the responses of freshwater communities to river restoration that apply in different taxonomic contexts. We compared the observed and predicted effects of restoration on sets of traits in fish and invertebrate communities in four reaches of the Rh^one River. Restoration included minimum flow increases in three bypassed main channels and the reconnection of eight floodplain channels. 2. Predictions (described in detail in three other articles in this Special Issue) were based on habitat models that related the density of modelled taxa to their physical habitats. We used trait information extracted from the literature to translate predicted taxonomic changes into predicted changes in traits. Observed changes in traits calculated for modelled taxa and for all taxa in the community were both compared to predictions. 3. In 10 of 12 cases, observed changes in traits correlated with predicted ones. With few exceptions, the agreement was higher for fish and invertebrates in the main channels than for invertebrates in floodplain channels. Predictions translated to the trait category level improved those at the taxonomic level in 5/6 and 4/6 cases for modelled taxa and all taxa, respectively. However, the improvement was statistically significant according to a null model for 1/6 and 3/6 cases for modelled taxa and all taxa, respectively. 4. The validation of trait predictions suggested that traits related to locomotion and attachment, as well as general biology and physiology, were particularly suited to predicting and understanding the effects of physical restoration. For example, after restoration, clingers and passive filter feeders dominated invertebrate communities in the main channels, whereas invertebrate communities in the floodplain underwent a selection of traits frequent in running water (clingers, flattened shape and gill respiration). Within fish communities, the periodic life-history strategy that characterises fish species in downstream reaches (long life span, large body, late sexual maturity) increased with restoration, whereas the opportunistic strategy decreased. 5. Our results suggest that a better understanding of how hydraulics shapes traits in riverine systems is critically needed for assessing the effects of restoration measures impacting flow. In addition, existing trait databases (especially for fish) should be expanded to better reflect the energetic trade-offs that organisms must make in various flow contexts

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“…This information is completed by reproduction traits for 34 freshwater fish (relative fecundity, egg diameter, age at maturity) (Pont et al, 1995).…”

Section: State Of Freshwater Fish Habitat Science In Francementioning

confidence: 99%

Freshwater Fish Habitat: Science, Management, and Conservation in France

Souchon¹,

Keith

2001

Aquatic Ecosystem Health &Amp; Management

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Characteristics of French water bodies and fish fauna are described with special reference to physically altered streams. Recent researches on fish physical habitat have produced new insights on: models of probability of fish distributions at a watershed scale, fish ecology, in particular about their habitat preferences, hydraulic statistical modelling with simplification of data collection, models of impacts of flow or modifications to stream morphology, and coupling physics and biology. These models have been validated at fish population (trout) or assemblage (Rhône river) level.Other complementary researches are dealing with fluvial dynamics necessary to maintain habitat or with ecological dynamic linked to flows and morphology (especially substrate).For the legal point of view, Fishing law (1984 in FCE a), Water law (1992 in FCE b), and the last European Water Framework Directive (2000) defined the limits of hydrosystems utilization. They defended the principle of an equilibrium between hydrosystems utilization.It is also necessary to better link streams and their watersheds. Waterbodies regionalization will be a good way to reduce the natural variability of physical and biological situations in order to better manage ecological entities with respect of their sensitivity. The setting of a national survey of fish communities is fundamental.National conservation programmes with main protected areas of France has not been very successful at protecting freshwater fish. Rehabilitation plans of some emblematic fish species Salmon, Sturgeon, Eel, Shad have helped to coordinate actions in large heavily anthropised rivers. In other numerous aquatic systems, it is better to restore the functioning of the first key compartments, hydrology and morphology. Fish communities are in these cases good measures of the benefits of rehabilitation actions. Future research will deal with different interfaces between physics and biology, in order to better manage channels, sediments, flows, and riparian vegetation.

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Stratégies démographiques des poissons des rivières françaises : premiers résultats

Cited by 11 publications

References 7 publications

Density-range size relationships in French riverine fishes

Density-range size relationships in French riverine fishes

The generality of changes in the trait composition of fish and invertebrate communities after flow restoration in a large river (French Rhône)

Freshwater Fish Habitat: Science, Management, and Conservation in France

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