Influence of water abstraction on the macroinvertebrate community gradient within a glacial stream system: La Borgne d'Arolla, Valais, Switzerland

Petts, Geoffrey E.; Bickerton, Melanie A.

doi:10.1111/j.1365-2427.1994.tb01133.x

Cited by 41 publications

(52 citation statements)

References 13 publications

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“…However, most such studies have investigated abstractions that removed the entire flow of a stream, or a very large proportion. For example, Petts and Bickerton (1994) found no macroinvertebrates for about 2 km downstream of a hydroelectric intake on a glacial stream in Switzerland, where flow was reduced to a small quantity of seepage in a geomorphologically unstable channel. Dudgeon (1992) reported declines in macroinvertebrate species richness and changes in the densities of several taxa in a stream in Hong Kong when flow ceased during the dry season because of abstraction at an upstream weir.…”

Section: Discussionmentioning

confidence: 97%

The challenge of monitoring impacts of water abstraction on macroinvertebrate assemblages in unregulated streams

Chessman¹,

Royal

Muschal³

2011

River Research & Apps

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Monitoring of the ecological impacts of water abstraction from unregulated streams in the state of New South Wales (NSW), Australia, is challenging because water is abstracted by thousands of geographically dispersed users who pump intermittently according to temporally varying needs and the limitations imposed by licences and access rules. Detailed, quantitative monitoring methods are too costly for widespread routine application because of the size of the state (801 000 km 2 ) and the large number of streams affected by abstraction. We therefore tested the possibility of detecting abstraction impacts on aquatic macroinvertebrates with rapid biological assessment (RBA) methods similar to those that are routinely used for biological monitoring of Australian rivers. We sampled 85 sites on unregulated streams in north-eastern NSW during a period of prolonged and recurring drought, 54 of which were designated as reference sites with respect to water abstraction because upstream entitlement for abstraction was less than 1% of their mean annual flow (MAF). The remaining, non-reference sites had an average of 4% of MAF licensed for upstream abstraction (range 1-20%). Sweep and kick samples were collected at each site in two seasons, and invertebrates were picked for 30 min per sample and analysed at genus level. We found a small but statistically significant overall difference in macroinvertebrate assemblages between the reference and non-reference sites, but the amount of upstream entitlement did not affect the degree to which assemblages at individual sites deviated from site-specific reference conditions. We attribute the absence of evident impact mainly to the low proportions of streamflow abstracted, but limitations of RBA methods may also be a factor. We recommend a risk-based approach to future monitoring whereby effort is focussed on those streams where a high proportion of flow is abstracted.

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Section: Discussionmentioning

confidence: 97%

The challenge of monitoring impacts of water abstraction on macroinvertebrate assemblages in unregulated streams

Chessman¹,

Royal

Muschal³

2011

River Research & Apps

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“…Estos taxa no mostraron una alta significancia y contribución con los ejes factoriales del Análisis de Co-inercia (taxa ubicados en el centro del mapa factorial), en otras palabras no se evidenció cierta dependencia a las variables ambientales estudiadas y sus poblaciones persisten en el espacio y tiempo en el tipo de hábitat estudiado. Milner & Petts (1994), propuso un modelo estructural de comunidad de macroinvertebrados en ríos sujetos a la influencia de glaciales en la región de los Alpes italianos y posteriormente fue corroborado por otros autores (Petts & Bickerton, 1994;Maiolini & Lencioni, 2001;Ilg & Castella, 2006). Aquel modelo propuesto concuerda con los taxa reportados en el presente estudio y que fueron aislados en el primer grupo del análisis de Conglomerados, excepto por la familia Gripopterygidae que no existe en la región templada.…”

Section: Discusiones Y Conclusiónunclassified

“…Bajo la perspectiva del calentamiento global de la tierra en estas últimas décadas y el retrocesos de los glaciales (Francou et al, 2000), ello podría favorecer el avancé de la sucesión biológica desde la regiones bajas hacia las altas, a causa del incremento de la temperatura (Petts & Bickerton, 1994). Al respecto Jacobsen (1997), sostiene que la regiones montañosas de Sudamérica, Norteamérica y Europa, se podría esperar un incremento de la riqueza en el futuro, pero en contraposición están las aseveraciones de Brittain & Milner (2001) y Ilg & Castella (2006), que el incremento acelerado de la temperatura afectaría significativamente la reducción de la diversidad de la comunidades de invertebrados acuáticos que están ubicados a pie de los glaciares.…”

Section: Discusiones Y Conclusiónunclassified

Estructura De Macroinvertebrados Acuáticos en Un Río Altoandino De La Cordillera Real, Bolivia: Variación Anual Y Longitudinal en Relación a Factores Ambientales

et al. 2008

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ResumenEste trabajo describe la estructura de la comunidad de macroinvertebrados acuáticos en un río altoandino de la cuenca amazónica boliviana. Se describe la variación anual y longitudinal en relación a factores ambientales. Este río libre de influencias antropogénicas, presenta una baja heterogeneidad longitudinal pero importantes variaciones de flujo. Además, como muchos ríos altoandinos, está alimentado y consecuentemente regulado por un glacial (Mururata). Este fenómeno decrece y está amenazado por la desaparición de los glaciales tropicales a causa del calentamiento global. Los efectos de la fauna podrían ser drásticos. Nuestros resultados muestran una baja riqueza de taxa de macroinvertebrados que sin embargo son abundantes, especialmente aquellas poblaciones que son permanentes: Baetidae (Andesiops peruvianus), Leptophlebiidae (Meridialaris tintinnabula), Gripopterygidae (Claudioperla tigrina), Simuliidae, Chironomidae y Oligochaeta. Mediante herramientas estadísticas de análisis multivariado, demostramos que la densidad y la riqueza de las poblaciones de macroinvertebrados están influenciadas por las variaciones de descarga hidráulica. Palabras clave: macroinvertebrados acuáticos, retroceso de glaciales, descarga hidráulica Abstract This work describes the structure of a macro invertebrate community in a high Andean stream of the Bolivian Amazon basin. Annual and longitudinal variations in relation to environmental factors are described. This stream has a low longitudinal heterogeneity, high flow variations, and is free of anthropogenic influences. In addition, this river as many other high-Andean waterways, is fed and consequently regulated by a glacier (Mururata). This is a diminishing phenomenon, so the river is threatened by the disappearance of tropical glaciers due the global climatic warming. The effects on the aquatic fauna could be drastic. Our results show low taxa richness, which are nevertheless abundant, especially those macro invertebrates whose populations are permanent: Baetidae (Andesiops peruvianus), Leptophlebiidae (Meridialaris tintinnabula), Gripopterygidae (Claudioperla tigrina), Simuliidae, Chironomidae and Oligochaeta. Using Multivariate Analysis, we demonstrate that the densities and richness of the benthic populations are under the influence of hydrological discharge variations. Key words: Aquatic macroinvertebrates, hydrological discharge, Andes, Bolivia Introducción.Los ríos altoandinos son importantes precursores de grandes ríos, cuyo estudio contribuye al conocimiento de la sumatoria de procesos que tiene lugar en las regiones bajas de la cuenca Amazónica (Allan et al., 2006). Por otro lado, muchos de estos ríos altoandinos posee un origen proveniente del deshielo de los glaciares, que en la actualidad están desapareciendo por su acelerado retroceso, por efecto del calentamiento global (Francou et al., 2000;Gallaire et al., 2000). Pese a esta realidad son pocos los estudios que se han realizado en los ríos de la región altoandina, respecto a sus características faunística...

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“…As a consequence, dams affect stream channel morphology via, e.g., colmation and armouring by fine sediments, or channel confinement by debris fans extending into the river and bed aggradation (Cobb et al, 1992). High elevation dams in the Alps impose additional impacts on downstream rivers because in many cases the water is diverted from the reservoir to downstream energy production facilities (Petts and Bickerton, 1994). As a result, these rivers receive only a small and constant residual discharge.…”

Section: Introductionmentioning

confidence: 99%

Longitudinal effects of experimental floods on stream benthos downstream from a large dam

Jakob

Robinson

Uehlinger

2003

Aquatic Sciences - Research Across Boundaries

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Abstract.We examined the longitudinal effects of 3 experimental floods on seston, periphyton, and macroinvertebrates in a regulated river downstream from a large reservoir in the Swiss Alps. In addition, suspended organic sediments, in conjunction with conductivity and turbidity, were measured during each flood. Three study reaches were selected downstream from the reservoir: an Upper site ca 150 m, a Middle site at 1.2 km, and a Lower site at 2.3 km from the dam. The Upper site was located upstream of any significant source of sediments. No flood effect was observed on water temperature, although river temperatures and diel amplitudes increased progressively downstream from the dam. Most organic sediments were mobilized and transported within the first few hours of each flood, with the pulse in sediments typically occuring later (after peak discharge) and being more prolonged at the Lower site. Turbidity generally decreased Aquat. Sci. 65 (2003) Dübendorf, 2003 Aquatic Sciences during the flood season, perhaps in response to lower amounts of fines and reductions in periphyton biomass. Seston concentrations (as chlorophyll a and AFDM) were lowest at the Upper site, and typically decreased following each flood. The flood response in seston was lowest at the Upper site and more pronounced at the Middle and Lower sites. Periphyton biomass also was lowest at the Upper site, and the flood effects were significant only in the Middle and Lower sites. In contrast, macroinvertebrate densities were similar between the Upper and Lower sites, and both sites exhibited a similar response to the floods. These results indicate a longitudinal response of river benthos to flooding below the reservoir that partly reflects the examined benthic constituent (periphyton or zoobenthos) and the longitudinal differences in the degree and type (e. g., flow in combination with sediment mobility and scouring) of disturbance.223 -231 1015-1621/03/030223-09 DOI 10.1007/s00027-003-0662-9 © EAWAG,

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Influence of water abstraction on the macroinvertebrate community gradient within a glacial stream system: La Borgne d'Arolla, Valais, Switzerland

Cited by 41 publications

References 13 publications

The challenge of monitoring impacts of water abstraction on macroinvertebrate assemblages in unregulated streams

The challenge of monitoring impacts of water abstraction on macroinvertebrate assemblages in unregulated streams

Estructura De Macroinvertebrados Acuáticos en Un Río Altoandino De La Cordillera Real, Bolivia: Variación Anual Y Longitudinal en Relación a Factores Ambientales

Longitudinal effects of experimental floods on stream benthos downstream from a large dam

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