Analyse de la richesse piscicole de quatre ensembles hydrographiques français

Pont, Didier; Belliard, Jérôme; Boët, Philippe; Changeux, Thomas; Oberdorff, Thierry; Ombredane, Dominique

doi:10.1051/kmae:1995010

Cited by 6 publications

(4 citation statements)

References 11 publications

(20 reference statements)

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“…In fact, increasing local species richness along the longitudinal stream gradient is a very well known pattern (e.g. Oberdorff et al, 1995;Pont et al, 1995;Grenouillet et al, 2004) that has been observed on almost all continents (Ibañez et al, 2009). As expected, the well oxygenated, summer-cold rhithral and small permanent upland basins (e.g.…”

Section: Figuresupporting

confidence: 66%

Fish-based groups for ecological assessment in rivers: the importance of environmental drivers on taxonomic and functional traits of fish assemblages

Matono

Formigo

Almeida

et al. 2012

Knowl. Managt. Aquatic Ecosyst.

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The use of river-types is of practical value, serving as groups for which assessment procedures can be developed and applied. An abiotic typology was set by the Portuguese Water Agency, mainly based on 6 major morphoclimatic regions. However, to be biologically meaningful, this typology should fit the distribution patterns of the biological quality elements communities proposed in Water Framework Directive under the lowest possible human pressure. This study aimed to identify and characterize fish-based geographical groups for continental Portugal and their environmental and geographical discriptors, using taxonomic and functional traits. Sampling took place between 2004 and 2006 during Spring. Fish fauna from 155 reference sites was analysed using a multivariate approach. Cluster Analysis on fish composition identified 10 fish-groups, expressing a clear correspondence to the river basin level, due to the restrict basin distribution of many species. Groups showed a wider aggregation in 4 regions with a larger geographical correspondence, statistically supported by Similarity Analysis, both on fish composition and mostly on fish metrics/guilds. Principal Components Analysis revealed major environmental drivers associated to fish-groups and fish-regions. Fish-groups were hierarchically grouped over major and local regions, expressing a large-scale response to a North-South environmental gradient defined by temperature, precipitation, mineralization and altitude, and a regional scale response mainly to drainage area and flow discharge. From North to South, fish-regions were related to the morphoclimatic regions. Results contributed to reduce redundance in abiotic river-types and set the final typology for Portuguese rivers, constituting a fundamental tool for planning and managing water resources.

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Section: Figuresupporting

confidence: 66%

Fish-based groups for ecological assessment in rivers: the importance of environmental drivers on taxonomic and functional traits of fish assemblages

Matono

Formigo

Almeida

et al. 2012

Knowl. Managt. Aquatic Ecosyst.

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“…This situation appears to be due to the particular relationship that ties the number of native species to the longitudinal gradient of the rivers in the Tiber River watershed. In fact, in temperate rivers the species richness progressively increases from mountain to valley (SHELDON, 1968;SCHLOSSER, 1982;BALON et al, 1986;MORIN and NAIMAN, 1990;PONT et al, 1995;BELKESSAM et al, 1997;CHANGEUX, 1995;PETERSON and RABENI, 2001) and this pattern surely characterized the autochthonous populations in the Tiber River in the past (BIANCO, 1990a;BIANCO and KEITMAIER, 2001). Currently, most of the native fish species appear to be confined to the intermediate reaches of the river and their number is particularly low in the downstream sectors, where fish communities are dominated by the transplanted species.…”

Section: Discussionmentioning

confidence: 99%

Native and Exotic Fish Species in the Tiber River Watershed (Umbria – Italy) and Their Relationship to The Longitudinal Gradient

Lorenzoni

Mearelli

Ghetti

et al. 2006

Bull. Fr. Pêche Piscic.

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In this study we examine the spatial variations in the fish communities in the Tiber River watershed, including both native and exotic species. Its main objectives were to assess the quality of fish communities of this area and to verify if factors of fish community disturbance are constant over the basin or if they change along the river gradient. The level of degradation was evaluated according to the ratio between the number of native fish species and total number of species (ZIC = Zoogeographic Integrity Coefficient). A total of 37 fish species was found, 13 native and 24 exotic (64.86%). Cyprinid is the prevailing family with 15 species (7 native, 8 exotic). The species most frequently introduced are cyprinids, followed by salmonids (4 species) and gobids (3 species). Of the 24 exotic species only 11 (45.83%) can be considered intentionally introduced by man: the proportion of intentionally introduced transplanted species (66.67%) is considerably higher than the translocated species (33.33%). There is a correlation between the longitudinal gradient of the river, the morphological evolution of the riverbed and decline in water quality. High ZIC values were related to higher elevation, greater slope and better water quality. As the size of the river increases the fish communities appear to be ever-more dominated by species of exotic origin, whose number progressively increases with the worsening of the water quality and downstream movement. The number of native species is the greatest in the middle reaches of the rivers, and decreases both upstream and downstream. Compared to the introduced species, the native species tend to stay upstream and are often the only species found in the headwaters. The number of introduced species increases downstream. We have also found differences among translocated and transplanted species: the first ones tend to favor the middle reaches of the rivers, while transplanted species seem to prefer the downstream sectors. In almost all cases, the sampling station immediately below an impoundment has the lowest ZIC values in comparison to the river stretches above the dam. Our preliminary results suggest that characteristics of fish community alterations depend on the type of river sector involved; the small rivers of the basin are a refuge zone for the native community and are currently of fundamental importance for maintaining biodiversity.Key-words: introduction, exotic species, fish community, Tiber River, longitudinal gradient, Zoogeography Integrity Coefficient. ESPÈCES PISCICOLES INDIGÈNES ET EXOTIQUES DU BASSIN VERSANT DU TIBRE (OMBRIE ITALIE) RÉSUMÉCette étude examine la variation spatiale des communautés piscicoles du bassin versant du Tibre en prenant en considération les espèces indigènes et exotiques. L'objectif principal est d'examiner la qualité des peuplements piscicoles du bassin et de vérifier si les facteurs de détérioration des peuplements piscicoles sont constants ou variables le long du gradient longitudinal. Le niveau de détérioration de la communauté...

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“…Traits were adapted from Balon (1975), Persat et al . (1994), Pont et al . (1995), Keith & Allardi (2001) and Lamouroux et al .…”

Section: Methodsmentioning

confidence: 99%

“…Biological traits were: potential size (PS), fecundity [potential number of eggs per year (FE)], maximum age (MA), reproductive period (RP, month), vertical position (VP), body form (BF), swimming factor [determined by the ratio of minimum depth of the caudal peduncle to the maximum caudal fin depth (SW)], trophic factor (TR) and reproductive factor (RE, spawning substrata) (Table II). Traits were adapted from Balon (1975), Persat et al (1994), Pont et al (1995), Keith & Allardi (2001) and Lamouroux et al (2002).…”

Section: S P a T I A L P A T T E R N S O F F I S H T R A I T Smentioning

confidence: 99%

Spatial patterns of the biological traits of freshwater fish communities in south‐west France

Santoul¹,

Cayrou²,

Mastrorillo³

et al. 2005

Journal of Fish Biology

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Spatial patterns in the combinations of biological traits of fish communities were studied in the Garonne River system (57 000 km 2 , south-west France). Fish species assemblages were recorded at 554 sampling sites, and the biological traits of species were described using a fuzzy-coding method. A co-inertia analysis of species distributions and biological traits identified some spatial patterns of species trait combinations. Fish species richness progressively increased from up-to downstream sections, and the longitudinal patterns of fish assemblages partitioned the river into clear biogeographic areas, such as the brown trout Salmo trutta (headwater streams), the grayling Thymallus thymallus, the barbel Barbus barbus and the bream Abramis brama zones (most downstream sections), which fitted with Huet's well-known zonation for western European rivers. Only a few biological traits, chiefly related to life-history attributes, significantly influenced the observed fish distributions. Fecundity, potential size, maximum age and reproductive factor increased from headwater to plain reaches. As a theoretical framework for assessing and predicting the functional organization of stream fish communities, spatial variations in species traits can be related to habitat conditions, thus providing explicit spatial schemes that may be useful to the design of both scientific studies and river management. # 2005 The Fisheries Society of the British Isles

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Analyse de la richesse piscicole de quatre ensembles hydrographiques français

Cited by 6 publications

References 11 publications

Fish-based groups for ecological assessment in rivers: the importance of environmental drivers on taxonomic and functional traits of fish assemblages

Fish-based groups for ecological assessment in rivers: the importance of environmental drivers on taxonomic and functional traits of fish assemblages

Native and Exotic Fish Species in the Tiber River Watershed (Umbria – Italy) and Their Relationship to The Longitudinal Gradient

Spatial patterns of the biological traits of freshwater fish communities in south‐west France

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