Typologie des faciès d'écoulement ou unités morphodynamiques des cours d'eau à haute énergie

Malavoi, Jean‐Réné

doi:10.1051/kmae:1989003

Cited by 49 publications

(34 citation statements)

References 1 publication

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“…The sampled river bed (10 m wide and 2000 m long), extended from the river mouth to 50 m above sea level. It is characterized by small cascades, rapids, cobble-riffles, pools and large runs (according to the classification of Malavoi, 1989). This alternation of hydromorphological facies creates differences in stream velocity and constitutes a mosaic of habitats available for macrofauna.…”

Section: Study Sitementioning

confidence: 99%

Organochlorine pollution in tropical rivers (Guadeloupe): Role of ecological factors in food web bioaccumulation

Coat¹,

Monti²,

Legendre³

et al. 2011

Environmental Pollution

122

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This paper determines the bioaccumulation and transfer processes of organochlorine pesticides within the stream food web in Guadeloupe (Caribbean). ABSTRACTConcentrations of organochlorine pesticides and stable isotope ratios of nitrogen and carbon were measured in a tropical freshwater ecosystem to evaluate the contamination level of biota and examine the bioaccumulation patterns of pollutants through the food web. Chemical analyses showed a general and heavy contamination of the entire food web. They revealed the strong accumulation of pollutants by juveniles of diadromous fishes and shrimps, as they re-enter the river. The role of ecological factors in the bioaccumulation of pesticides was evaluated. Whereas the most persistent pollutants (chlordecone and monohydro-chlordecone) were related to the organisms diet and habitat, bioaccumulation of β-HCH was only influenced by animal lipid content. The biomagnification potential of chlordecone through the food chain has been demonstrated. It highlighted the importance of trophic transfer in this compound bioaccumulation process. In contrast, bioconcentration by passive diffusion from water seemed to be the main exposure route of biota to β-HCH.

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Section: Study Sitementioning

confidence: 99%

Organochlorine pollution in tropical rivers (Guadeloupe): Role of ecological factors in food web bioaccumulation

Coat¹,

Monti²,

Legendre³

et al. 2011

Environmental Pollution

122

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“…We characterised four types of morphological units and measured their fre quency in each of the sectors studied: shallow riffles, deep riffles, pools and shelters according to Malavoi (1989) (Table 1). Shelters are considered as natural hides available to fish along the banks or in the bed of the river.…”

Section: Study Areamentioning

confidence: 99%

Influence of environmental variables on the growth ofLeuciscus cephalus(Linnaeus 1766), in the River Durance, South-east France

Bouchard¹,

Chappaz²,

Cavalli³

et al. 1998

Ann. Limnol. - Int. J. Lim.

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The chub, Leuciscus cephalus, colonizes the Durance river from its confluence with the Rhône river (alt. 13 m) up to the Serre Ponçon dam (alt. 780 m.). The Durance has been exposed to strong human pressure, notably dam construction, reduction of flow rate and perturbation of the natural zonation patterns. The linear growth of chub was studied by scale measurement at six stations in the Durance catchment area : two of which are located in its main tributaries, the Buech river and the Verdon. An analysis (ANOVA) of the mean size of fish from one to five years of age shows significant differences between the stations. Principal Component Analysis, in which the stations are characterized by eight nosological variables associated with the density of invertebrates and the number of degree-days above 12° and 22°C established a correlation between chub growth and species habitat, defined in terms of current flow rate, depth and substrate type and temperature. This correlation could be explained in two ways : 1-in slow-flowing homogenous riffle zone, the low water depth and absence of shelters limit the diversity of habitats and the biological richness; nevertheless the abundance of invertebrates does not seem to play an important role ; 2 -in zone of slow flowing riffles subjected to large daily and seasonal variations in water temperature, as in this mediterranean river, temperature might be quite high. Fish older than two years, therefore prefer zones of deep water, where the thermic inertia is stronger. Influences des variables

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“…Chaque station a été divisée en faciès d'écoulement (MALAVOI, 1989). Sur chacun de ces faciès, des transects de hauteur d'eau (sondage au cm près) et de vitesse du courant (mesurée au cm/s près, à l'aide d'un courantomètre Marsh McBirney 201 D) ont été effectués, et la granulométrie a été estimée au point contact selon l'échelle de CAILLEUX (1954).…”

Section: Mesures D'habitatunclassified

Capacité de la méthode des microhabitats à prédire l'habitat de reproduction de la truite commune

Delacoste

Baran

Lascaux

et al. 1995

Bull. Fr. Pêche Piscic.

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RÉSUMELa méthode des microhabitats a été appliquée pour le stade reproduction de la truite commune sur 205 faciès d'écoulement, appartenant à 6 rivières des Pyrénées centrales. La relation entre Surface Pondérée Utile (SPU) et densité de frayères est meilleure avec la courbe d'utilisation d'habitat développée sur les rivières pyrénéennes qu'avec celle proposée par BOVEE (1978). Cependant, la SPU est importante pour certains types de faciès présentant de faibles densités de frayères. Ceci se traduit par un effet faciès au niveau du taux d'utilisation de la SPU. Ce phénomène est dû à une surestimation de la SPU pour certains types de faciès où le gravier, dispersé entre des matériaux grossiers et donc inutilisable par la truite pour se reproduire, est pris en compte lors du calcul de la SPU. Cette étude souligne l'importance du caractère régional des courbes d'utilisation d'habitat, mais surtout la nécessité de prendre en compte un critère d'agrégation des matériaux lors de la description du substrat, dans l'optique de décrire l'habitat de reproduction des salmonidés. Mots-clés : méthode des microhabitats, truite, reproduction. ABILITY OF INSTREAM FLOW INCREMENTAL METHODOLOGY TO PREDICTBROWN TROUT SPAWNING HABITAT. ABSTRACTThe Instream Flow Incrémental Method was applied to brown trout reproduction, in 205 morphodynamic units of 6 Pyrénées mountain streams. The corrélation between Weighted Usable Area (WUA) and redd density was higher when using a local habitat suitability curve, instead of the standard cun/e of BOVEE (1978). However, WUA was high in some units with low redd density. This was due to an over-estimation of the WUA in some types of unit where the gravel taken into account in WUA calculation was scattered between coarse material and thus unusable for trout spawning. This study underlines the importance of using an aggregation criterion when describing the substratum for spawning salmonids.

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Typologie des faciès d'écoulement ou unités morphodynamiques des cours d'eau à haute énergie

Cited by 49 publications

References 1 publication

Organochlorine pollution in tropical rivers (Guadeloupe): Role of ecological factors in food web bioaccumulation

Organochlorine pollution in tropical rivers (Guadeloupe): Role of ecological factors in food web bioaccumulation

Influence of environmental variables on the growth ofLeuciscus cephalus(Linnaeus 1766), in the River Durance, South-east France

Capacité de la méthode des microhabitats à prédire l'habitat de reproduction de la truite commune

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