Assessing stream quality using information on mesohabitat distribution and character

Tickner, David; Armitage, Patrick D.; Bickerton, Melanie A.; Hall, Kevin

doi:10.1002/1099-0755(200005/06)10:3<179::aid-aqc403>3.0.co;2-u

Cited by 57 publications

(50 citation statements)

References 12 publications

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“…Hydromorphological conditions play an important role in these monitoring programs (REFCOND, 2003;CEN, 2004). Consequently, many countries now have sampling protocols and indices that require information on mesohabitat recognition and characterisation to evaluate hydromorphological conditions (e.g., Raven et al, 1997;LAWA, 2000;Tickner et al, 2000;Pardo et al, 2002;Fernández et al, 2011).…”

Section: Introductionmentioning

confidence: 90%

“…An HMU exhibits distinctive hydraulic properties and a characteristic channel cross-section (Dollof et al, 1993;Parasiewicz et al, 2009). This concept is similar to the mesohabitat concept previously used in other studies (Vadas & Orth, 1998;Tickner et al, 2000;Schwartz & Herricks, 2008). In this paper, we treat mesohabitat and hydromorphological unit as synonyms.…”

Section: Data Collectionmentioning

confidence: 99%

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Wireless CDN video streaming architecture for IPTV

Palau

Mares

Molina

et al. 2010

Multimed Tools Appl

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Mesohabitat heterogeneity in four mediterranean streams of the Jucar river basin (Eastern Spain)The hydromorphological units or mesohabitats of the headwaters of four Mediterranean streams were studied by classifying them according to their length, width, average and maximum depth, percentage of substrate and water volume. These characteristics of the streams were assessed over four consecutive years (2003)(2004)(2005)(2006). The main objective of the study was to analyse the spatial and temporal pattern of the physical attributes of the mesohabitats. Classification strength and dendrograms were examined for each stream, mesohabitat type, and combination of stream and mesohabitat type and for stream mesohabitat type and year, whereas Nonmetric Multidimensional Scaling ordination (NMDS) was used to analyse classification patterns. The Villahermosa and Ebrón streams were more homogeneous than the Palancia and Vallanca streams, whereas riffles and glides were more homogeneous than pools and rapids. The NMDS indicated that the slow water-velocity (pools, glides) and fast (riffles, rapids) mesohabitats tended to group together. Temporally, the Ebrón stream pools were homogeneous and very stable over the four years, whereas the Vallanca and Villahermosa pools showed a certain degree of variability. The Palancia pools were the most variable and heterogeneous during the study period. These results underscored the importance of separating different types of deep, slow-velocity habitats in mesohabitat inventories and the importance of evaluating habitat classifications in eco-hydromorphological and hydrobiological studies, especially in Mediterranean streams and rivers.Key words: Mediterranean streams, hydromorphological units, mesohabitat, habitat classification, similarity, Iberian Peninsula. (2003)(2004)(2005)(2006) RESUMEN Heterogeneidad del mesohábitat en cuatro ríos mediterráneos de la cuenca del río Jucar (Este de España) Las unidades hidromorfológicas o mesohábitats de cuatro ríos mediterráneos de cabecera fueron estudiadas en función de su longitud, anchura, profundidad media y máxima, porcentaje de sustrato y volumen de cada mesohábitat durante cuatro años consecutivos

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Section: Introductionmentioning

confidence: 90%

Section: Data Collectionmentioning

confidence: 99%

Wireless CDN video streaming architecture for IPTV

Palau

Mares

Molina

et al. 2010

Multimed Tools Appl

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“…Para completar la caracterización del ensamble bentónico de cada sitio se determinó el Índice de Preferencia Relativa (IPR) (tiCkner et al, 2000), dividiendo la abundancia de cada taxa en una cierta situación de muestreo (sitios, hábitats y fechas) por su abundancia total registrada en todas las muestras colectadas. Además, para investigar qué taxa son indicadores ecológicos de un sitio particular, se utilizó el Método de Valor Indicador (Indicator Value -IndVal) propuesto por dufrene & legendre (1997), que integra en un valor porcentual, la frecuencia de ocurrencia (fidelidad) y la abundancia relativa (concentración) de las especies de un hábitat determinado.…”

Section: Materials Y Métodosunclassified

“…En el área de piedemonte se encuentra emplazada la Presa Achiras, cuya construcción culminó a comienzos de 2008. Esta presa, con una altura de 23 m, controlará las amenazas de eventos catastróficos las comunidades acuáticas originales, sus variaciones espacio-temporales, los listados taxonómicos de especies, su biología, sus requerimientos de hábitat y su rango geográfico pasado y presente son conocimientos que constituyen la base para la protección legal de especies amenazadas por acciones antrópicas, y la conservación y recuperación de hábitats (tiCkner et al, 2000;ArmitAge, 2006;strAyer, 2006).…”

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Estructura de la comunidad de macroinvertebrados del arroyo Achiras (Córdoba, Argentina): análisis previo a la construcción de una presa

Gualdoni

Oberto

2012

Iheringia, Sér. Zool.

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ABSTRACT. Macroinvertebrate community structure of the Achiras stream (Córdoba, Argentina): analysis prior to a dam construction. Regulation of rivers and streams modifies parameters that directly influence on the biota. In Achiras-del Gato endorheic basin has completed the construction of a midsize dam that will alter the limnological characteristics of the system and the structure of benthic communities. This study provides the first taxonomic records of macrobenthos of this lotic system and analyzes the spatial and temporal variations of the community structure in the foothills stretches of Achiras stream. Zoobenthos samples were collected and abiotic variables were recorded in runs and riffles, during a year, in two sites located upstream and downstream of the dam area, prior to the dam was built. For each site, habitat and season we determined the abundance, frequency, taxonomic richness, Shannon and evenness, and the data were analyzed using one-way and three-way ANOVA. Attributes of the reference communities were complemented by the determination of ecological indicators and detectors, and exclusive taxa. In the first site 73 taxa were recorded, Simulium was the most abundant and Leptohyphes eximius Eaton, 1882, was the most frequent. In the second site we found 75 taxa, Caenis was the most abundant and Cricotopus sp. 3, was the most frequent. In this study composition and distribution of the biota and indicators taxa are discussed. We determined that the community attributes were affected by the hydrological periods in wich the samples were taken. Achiras stream has a phreatic-pluvial hydrological regime with low flows in winter and high flows in summer. Therefore, we expect changes in native biota and in system integrity in response to hydraulic variability reduction when Achiras dam start functioning and alters the natural flow.KEYWORDS. Streams, benthic community structure, spatial and temporal distribution, indicative taxa. RESUMEN.La regulación de ríos y arroyos mediante diques modifica parámetros que influyen directamente sobre la biota. En la cuenca endorreica Achiras-del Gato ha finalizado recientemente la construcción de una presa de mediana envergadura que alterará las características limnológicas del sistema y la estructura de las comunidades bentónicas. Este estudio aporta los primeros registros del macrobentos de este sistema lótico y analiza la variación espacio-temporal de la estructura de la comunidad en tramos pedemontanos del arroyo Achiras. Durante un año, antes de la construcción de la presa, se colectaron muestras de zoobentos y se registraron variables abióticas en correderas y rabiones de dos sitios del arroyo, uno situado río arriba del área del dique y otro aguas abajo de la misma. Para cada sitio, hábitat y estación del año se determinó abundancia, frecuencia, riqueza taxonómica, Índice de Shannon y equidad, y se analizaron mediante ANOVA de una y tres vías. Los atributos de las comunidades de referencia se complementaron con la determinación de taxa exclusivos e indicadores y d...

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“…Field data is collected using a standard continuous observation along 500 m length of river channel (called sweep up) and by 10 transects (spot checks) separated by 50 m. In this study, we carried out RHSm over a total segment length of only 50 m comprising five spot checks 10 m apart and sweep up along the total length of the reduced segment. The objective was to achieve a better relationship between the biological data and habitat descriptors since several authors have found a weak association between RHS and biological data mainly attributable to the different spatial scales of each type of analysis, i.e., biological data such as benthic fauna are obtained from sets of micro-habitats while RHS data derives from a larger scale of one or more meso-habitats (Cortes et al 2008;Davenport et al 2004;Tickner et al 2000).…”

Section: River Corridor and Fluvial Habitatmentioning

confidence: 99%

Evaluation of the ecological status of an impaired watershed by using a multi-index approach

Carvalho

Cortes

Bordalo

2010

Environ Monit Assess

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The objective of this study was to use an integrative approach to assess the ecological status of a small river impacted by multiple sources of disturbance. The River Febros (NW Portugal) is a small and highly impacted non-regulated river; approximately 44% of the watershed area is dedicated to agriculture, but there is also some urbanization. Environmental status was evaluated using a new multi-index approach, combining quality indices for water (Water Quality Index (WQI)), benthic macroinvertebrates (Iberian Biological Monitoring Working Party Index (IBMWP)), and human modification (Riparian Forest Quality Index (QBR)); Ecological Status River Mediterranean Index (ECOSTRIMED); River Habitat Survey (RHS)). Surveys were car- four stretches of the main course of the river for physicochemical characteristics, as well as water microbiology and macroinvertebrates. Water quality was poor at all sites (WQI averaged 30.4%) and decreased downstream. The RHS (assessment of instream habitats and the river corridor) and the QBR quantification displayed the same trend. Macroinvertebrates diversity was permanently low with only the most tolerant insects taxa present; oligochaetes dominated. The ecological status of River Febros was well represented using the experimental assessment system, where a downstream decrease in condition was noticeable (in spite of a lower water quality upstream). Our results emphasize the importance of assessing several components of disturbed ecosystems in order to ascertain overall quality and the importance of promoting improvement of the riparian gallery as a buffer against multiple agents of disturbance.

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Assessing stream quality using information on mesohabitat distribution and character

Cited by 57 publications

References 12 publications

Wireless CDN video streaming architecture for IPTV

Wireless CDN video streaming architecture for IPTV

Estructura de la comunidad de macroinvertebrados del arroyo Achiras (Córdoba, Argentina): análisis previo a la construcción de una presa

Evaluation of the ecological status of an impaired watershed by using a multi-index approach

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