Impact of Large Discharge Fluctuations on the Macroinvertebrate Populations Downstream of a Dam

Gaschignard, O.; Berly, Alain

doi:10.1007/978-1-4684-5392-8_10

Cited by 24 publications

(16 citation statements)

References 8 publications

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“…The permanence of the numerous habitats is linked to the bed of coarse sediments and to the heterogeneities of the marginal areas of the steep valley, which followed the described model of Petts and Greenwood. This pattern displayed by diversity was also reported by Gaschignard and Berly (1987) who found greater richness in the adjusting reach, which they linked to an increasing habitat complexity during the channel adjustment which thus developed a greater hydraulic and substrate heterogeneity. The rarefaction of coarse sediment has been pointed out by various authors (e.g.…”

Section: Discussionsupporting

confidence: 67%

“…The rarefaction of coarse sediment has been pointed out by various authors (e.g. Resh, 1977;Gaschignard and Berly, 1987) as a reason for drastic reductions in the abundance of shelter-building invertebrates; this coincides with the work of Cortes et al (1998), for whom the observed high resilience of some systems to damming is associated with the maintenance of substratum heterogeneity. On the other hand, Cauzobon and Giudicelli (1999), when studying River Res.…”

Section: Discussionmentioning

confidence: 69%

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Macroinvertebrate community structure in a regulated river segment with different flow conditions

Cortes

Ferreira²,

Varandas

et al. 2002

River Research & Apps

105

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Two types of modification of the hydrological system are present in the same regulated segment of the Lima River (NW Portugal): (a) a reduced and constant flow from hypolimnetic release; (b) an intense irregular flow (daily and seasonal). Using multivariate techniques it was possible to compare the effects of these two kinds of disturbance on the macroinvertebrate communities. The communities colonizing both sites exhibited a higher variation in composition and diversity when compared to undisturbed sites. However, such variability was even more evident in the first case, in spite of the stability of the environmental conditions. Such temporal replacement of species is linked to the dominance of tolerant taxa with short life cycles. In the regulated segment the poor water quality and the lack of litter input impacted mainly on the shredders group. This work shows the failure of the practice of releasing constant flows as an attempt to mitigate regulation impacts.

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Section: Discussionsupporting

confidence: 67%

Section: Discussionmentioning

confidence: 69%

Macroinvertebrate community structure in a regulated river segment with different flow conditions

Cortes

Ferreira²,

Varandas

et al. 2002

River Research & Apps

105

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“…Many taxa generally abundant at this station were absent (Planarians, Ostracoda, Isopoda and stygobite Amphipoda, Table 2). The live taxa collected (Table 2) are epigean dwellers frequently found in the benthic layers of Miribel Canal (Gammarus sp., Empididae and juveniles of Ephemeroptera; Gaschignard & Berly, 1987;Gashignard-Fossati, 1986) and a Cladocera normally living in stagnant water such as dead arms of the river (Leydigia leydigi: Amoros, 1980). At the two other stations (IA & IIC; Tables 3 and 4), which are fed mainly by groundwater, species richness was higher just after the spate (16 and 13 taxa, respectively, Table 1).…”

Section: Study Area Materials and Methodsmentioning

confidence: 99%

Effects of spates on interstitial assemblages of the Rhône River. Importance of spatial heterogeneity

Marmonier

Châtelliers

1991

Hydrobiologia

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The dynamics of interstitial assemblages, after a spate and during low discharge, was studied in a regulated channel (Miribel Canal) of the Upper Rhone River, France. Using a Bou-Rouch pump, three stations were samples: 1) Station IIA, a site fed by superficial water infiltrations, 2) Station IIC, a site fed by riparian phreatic water, and 3) Station IA, a site fed by both surface and phreatic waters. The spate greatly influenced the interstitial assemblages, their dynamics were different according to the hydrology of the given site. At Station IIA, the spate had a wash-out effect on the assemblages (reduction in abundance and diversity), whereas during low discharge the interstitial layer received a continuous influx of epigean organisms (benthic and limnophilous). At Stations IIC and IA, the spate introduced numerous limnophilous and benthic invertebrates into the interstices, which function as an organismic trap. However, these sites appear to be more isolated from surface waters during low discharge. Stygobites decreased or disappeared after the spate. They appear highly sensitive to hydrologic perturbations in the surface waters.

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“…Factor one describes a longitudinal gradient, represented in Fig. 3 (Jurine), (Boumaud, Tachet & Perrin, 1982;Perrin & Roux, 1978;Dessaix, 1980;Gaschignard-Fossati, 1986;Gaschignard & Berly, 1987;Creuze des Chatelliers, 1991). Apart from Fabaeformiscandona zvegelini (Petkovski), no hypogean taxa were found in this group.…”

Section: Spatial Distribution Of Interstitial Assemblages In Gravel Bmentioning

confidence: 99%

Patch distribution of interstitial communities: prevailing factors

1992

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1. Conimunity structure of interstitial invertebrates was studied in the sediments of two gravel bars in a bypass section of the Rhone River (France), in relation to hydroiogical patchiness and to major geomorphologicai characteristics of the sampling areas. Hydroiogical patchiness was characterized by upwelling or downwelling zones while geomorphologicai characteristics were concerned mainly with position towards the head or tail of each bar, which presented different environmental conditions. 2. Longitudinal profiles of the two bars, at 0.5 and 1.0 m below the substrate surface, were compared. At each station 10-1 samples were taken using mobile standpipes and a Bou-Rouch pump. During low-water conditions, replicate samples were taken in both the head-bar and tail-bar regions to confirm the results. Physicochemical parameters were used to differentiate surface water from ground water (conductivity, alkalinity, silica, nitrates, sulphates and temperature) and to detect hydroiogical patterns. 3. Two different situations were observed within the gravel bars. In the first one, the upwelling zone was situated in the tail bar and downwelling zone in the head bar. The reverse was observed in gravel bar 2 where the head-bar region formed the upwelling zone and the tail-bar region formed the downwelling zone. 4. In the first situation, the distribution of interstitial assemblages corresponded with the observed hydroiogical patterns: epigean fauna characterized the downwelling zone and stygofauna characterized the upwelling zone. The interstitial fauna seemed to be strictly linked to the mode of water movement within the sediments. Hydrological patchiness therefore appeared to be an important factor for the structure of interstitial assemblages. 5. In the second case there was no relationship between the hydroiogical and the biological pattern. Epigean fauna and hypogean fauna were scattered all along the gravel bar. These results suggest that geomorphology is a second important factor governing the composition and structure of interstitial assemblages. A precise structure was obtained when hydroiogical and geomorphologicai characteristics were superimposed (case 1). When they were opposed (case 2) all the spedes responded according to their individual ecological requirements.

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Impact of Large Discharge Fluctuations on the Macroinvertebrate Populations Downstream of a Dam

Cited by 24 publications

References 8 publications

Macroinvertebrate community structure in a regulated river segment with different flow conditions

Macroinvertebrate community structure in a regulated river segment with different flow conditions

Effects of spates on interstitial assemblages of the Rhône River. Importance of spatial heterogeneity

Patch distribution of interstitial communities: prevailing factors

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