Peuplement des Crustacés dans la zone hyporhéique d'un ruisseau des Pyrénées

Rouch, R.

doi:10.1051/limn/1995006

Cited by 16 publications

(9 citation statements)

References 19 publications

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“…1992 ). At smaller scales (the reach), faunal assemblages appear more patchy than gradual ( Marmonier & Dole 1986;Creuzé des Châtelliers & Reygrobellet 1990;Rouch 1988, 1991, 1992;Rouch & Lescher‐Moutoué 1992) and seem mainly linked to local characteristics and substream flow paths ( Creuzé des Châtelliers 1991;Dole‐Olivier & Marmonier 1992;Rouch 1995).…”

Section: Discussionmentioning

confidence: 99%

Surface water–groundwater exchanges in three dimensions on a backwater of the Rhône River

Dole‐Olivier

1998

Freshwater Biology

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1. Hydrological exchange between the surface stream and the hyporheic zone is well documented in the main channel of rivers, especially at the reach scale. Hydrological processes of advection/convection occur at different scales, and in secondary channels of large rivers little is known about these exchanges in the hyporheic zone on a broad scale (i.e. kilometres). This work studied exchanges of water and biota in a secondary channel on a large scale (4 km), using a three‐dimensional framework. 2. The exchanges of water were described using physicochemical indicators of surface and groundwaters. Samples of water and biota were taken in three dimensions: (i) vertically from benthic (i.e. 0.20 m below the surface of the substratum) to hyporheic (0.50 m) and deep interstitial (1.0 m) zones; (ii) laterally from the right to the left bank (i.e. right, middle and left positions); and (iii) longitudinally from upstream to downstream (seven stations regularly distributed along the channel). 3. The physicochemical indicators clearly revealed hydrological heterogeneity in the longitudinal and vertical dimensions, whereas lateral variability was not significant. 4. Spatial distribution of biota exhibited strong longitudinal variations that were not gradual as predicted by an upstream/downstream continuum, but patchy and discontinuous. No significant differences were found between the three positions across the channel. 5. Analyses of both physicochemical and faunal data sets produced matched ordination of samples and stations, indicating that interstitial–surface flow relationships appear to be an important governing factor in the distribution of interstitial biota at this broad scale. 6. Results are discussed in relation to the hypothetical three‐dimensional models of the hyporheic zone in rivers. Contrasting with other observations on the main channel (where advection/convection patterns are dominated by morphological changes of the river‐bed morphology), it is proposed that water exchanges in backwaters are more likely to be related to local modifications of stream‐bed porosity.

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Section: Discussionmentioning

confidence: 99%

Surface water–groundwater exchanges in three dimensions on a backwater of the Rhône River

Dole‐Olivier

1998

Freshwater Biology

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“…The high spatial heterogeneity was demonstrated for both karstic (Brancelj, 2002;Pipan et al, 2006) and porous (Rouch, 1988(Rouch, , 1991(Rouch, , 1992(Rouch, , 1995Rouch & Lescher-Moutoué, 1992) aquifers. These statements were confirmed by Galassi et al (2009b), who demonstrated a strong habitat segregation of stygobiotic fauna in the Lessinian massif, and by the present study, which evidentiated a high species dissimilarity among caves within the same aquifer in the eastern Alpine stygoregion, independent of regional species richness.…”

Section: From the European Scale To The Stygoregional Scalementioning

confidence: 97%

Stygobiotic crustacean species richness: a question of numbers, a matter of scale

Stoch

Galassi

2010

Hydrobiologia

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Species richness in ground water is still largely underestimated, and this situation stems from two different impediments: the Linnaean (i.e. the taxonomic) and the Wallacean (i.e. the biogeographical) shortfalls. Within this fragmented frame of knowledge of subterranean biodiversity, this review was aimed at (i) assessing species richness in ground water at different spatial scales, and its contribution to overall freshwater species richness at the continental scale; (ii) analysing the contribution of historical and ecological determinants in shaping spatial patterns of stygobiotic species richness across multiple spatial scales; (iii) analysing the role of b-diversity in shaping patterns of species richness at each scale analysed. From data of the present study, a nested hierarchy of environmental factors appeared to determine stygobiotic species richness. At the broad European scale, historical factors were the major determinants in explaining species richness patterns in ground water. In particular, Quaternary glaciations have strongly affected stygobiotic species richness, leading to a marked latitudinal gradient across Europe, whereas little effects were observed in surface fresh water. Most surface-dwelling fauna is of recent origin, and colonized this realm by means of post-glacial dispersal. Historical factors seemed to have also operated at the smaller stygoregional and regional scales, where different karstic and porous aquifers showed different values of species richness. Species richness at the small, local scale was more difficult to be explained, because the analyses revealed that point-diversity in ground water was rather low, and at increasing values of regional species richness, reached a plateau. This observation supports the coarse-grained role of truncated food webs and oligotrophy, potentially reflected in competition for food resources among co-occurring species, in shaping groundwater species diversity at the local scale. Alpha-diversity resulted decoupled from c-diversity, suggesting that b-diversity accounted for the highest values of total species richness at the spatial scales analysed.

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“…Diacyclops and Parastenocaris were mostly represented in the hyporheic habitat, with a high incidence of sympatric species. This suggests that microhabitat diversity might have been the primary factor promoting radiation, generating a high level of cryptic diversity in these genera (Reid, 1992; Boxshall & Evstigneeva, 1994; Rouch, 1995; Pospisil & Stoch, 1999; Galassi, 2001). The highest species richness was found again in the hyporheic habitat and in the epikarst, with 21 and 15 stygobiotic copepod species, respectively.…”

Section: Diversity Of Groundwater Copepodsmentioning

confidence: 99%

Diversity, ecology and evolution of groundwater copepods

2009

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SUMMARY1. With few exceptions, copepods dominate over other crustacean and non-crustacean invertebrate groups in ground water. They have colonised a vast array of habitats in continental ground waters, where they are represented by over 1000 species in six orders: Platycopioida, Misophrioida, Calanoida, Cyclopoida, Harpacticoida, Gelyelloida. However, members of only the last four orders entered genuine fresh ground water. 2. Stygobiotic copepods show a wide range of morphological and physiological adaptations to different groundwater habitats. They frequently exhibit simplifications in body plans, including reductions in appendage morphology, which is regarded as a result of paedomorphic heterochronic events. 3. Copepod distributions at small spatial scales are most strongly affected by habitat type and heterogeneity, with sediment grain size and availability of organic matter being important habitat characteristics. Large-scale spatial distributions (biogeographical) are mainly related to past geological, climatic and geographical processes which occurred over medium to long time scales. 4. Such processes have affected colonisation patterns and diversification of copepods in ground water, leading to a number of phylogenetic and distributional relicts and a high degree of endemism at different taxonomic levels. This is reflected in the composition of groundwater copepod communities characterised by distantly related species in the phylogenetic tree. 5. Copepods dominate the species richness of groundwater fauna in all regions and on all continents where more than cursory surveys have been carried out, i.e. in Europe, North and Latin America as well as in Australia. 6. Species-specific microhabitat preferences, high proportions of local endemics, high proportions of phylogenetic and distributional relicts, and higher-level taxonomic diversity are all factors suggesting that copepods are a useful indicator group of overall species richness for defining conservation priorities in ground water.

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Peuplement des Crustacés dans la zone hyporhéique d'un ruisseau des Pyrénées

Cited by 16 publications

References 19 publications

Surface water–groundwater exchanges in three dimensions on a backwater of the Rhône River

Surface water–groundwater exchanges in three dimensions on a backwater of the Rhône River

Stygobiotic crustacean species richness: a question of numbers, a matter of scale

Diversity, ecology and evolution of groundwater copepods

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