Influences of a point source on the microhabitat distribution of stream benthic macroinvertebrates

Ortiz, J. D.

doi:10.1127/0003-9136/2006/0165-0469

Cited by 11 publications

(8 citation statements)

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“…The significant differences in these values can be explained by the reduced habitat stability caused by the wet season, as suggested by Death and Winterbourn (1995) coupled with less efficient sampling during high water. Although our results concord with those from other studies of the importance of habitat diversity for spatial structuring (Southwood, 1977(Southwood, , 1988Statzner et al, 1997;Doisy and Sandin, 2003;Ciesielka and Bailey, 2007) and of hydrological regimes for temporal structuring (Junk et al, 1989;Gibbins et al, 2001;Bunn and Arthington, 2002;Silveira et al, 2006;Bonada et al, 2007) of benthic macroinvertebrate assemblages, environmental degradation in the Velhas River basin was the most important main structuring agent observed. Sites 3 and 4 represented extremely degraded conditions, with high values for metrics indicating poor water quality (%CHI, %OLI, %COG, and density).…”

Section: Discussioncontrasting

confidence: 56%

“…Seasonal hydrological variations are an environmental factor of great importance for benthic macroinvertebrate assemblages (Gibbins et al, 2001). In tropical rivers, the rainfall plays an important role in the flood regime, and consequently in the structure of the aquatic assemblages (Junk et al, 1989). Our results indicated that during the wet season, the assemblages had lower richness and organismal densities.…”

Section: Discussionmentioning

confidence: 54%

“…Statzner et al (1988) concluded that hydraulic characteristics determine the distribution of invertebrate assemblages from the headwaters to the river mouth and within a river segment. In tropical regions, seasonal variations (Flecker and Feifarek, 1994), ecological interactions (Katano et al, 2007;Schmera et al, 2007), and land use (Hynes, 1975) are considered important. Despite 20 years of continuum studies, few unequivocal statements can be made about the main factors influencing aquatic assemblages.…”

Section: Introductionmentioning

confidence: 99%

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Factors determining the structure and distribution of benthic invertebrate assemblages in a tropical basin

Moreno¹,

França²,

Ferreira³

et al. 2010

nbc

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We used the das Velhas River basin in southeastern Brazil as a study unit to evaluate the role of various physical and chemical variables and the state of conservation in determining the structure and distribution of benthic macroinvertebrate communities. The habitats were characterized through the use of a rapid evaluation protocol, the examination of the granulometric composition of the sediments, and the precipitation in the sub-basins of the segments studied. The taxonomic structure was determined, Shannon-Wiener and Simpson diversity indexes, taxonomic richness, % EPT and % Chironomidae for the benthic assemblages. The results corroborated the importance of habitats in spatial structuring, the importance of the hydrological regime in temporal structuring, and the state of conservation as the main structuring agents of benthic macroinvertebrate assemblages.Key words: biological metrics, bioindicators, protected areas, environmental impact. ResumoFoi utilizada a bacia hidrográfica do Rio das Velhas, sudeste do Brasil, como unidade de estudo para avaliar o papel das variáveis físicas e químicas além do estado de conservação na determinação da estrutura e distribuição das comunidades de macroinvertebrados bentônicos. A caracterização dos habitats foi realizada através da utilização de um protocolo de avaliação rápida, da determinação da composição de granulométrica dos sedimentos e da precipitação nas sub-bacias hidrográficas dos segmentos estudados. Foi determinada a estrutura taxonômica das comunidades bentônicas através dos índices de diversidade de Shannon-Wiener e Simpson, além da riqueza taxonômica, % EPT e % Chironomidae. Os resultados encontrados corroboraram a importância dos habitats na estruturação espacial, do regime hidrológico na estruturação temporal e o estado de conservação como o principal agente de estruturação das comunidades de macroinvertebrados bentônicos.Palavras-chave: parâmetros biológicos, bioindicadores, áreas de proteção ambiental, impacto ambiental.

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Section: Discussioncontrasting

confidence: 56%

Section: Discussionmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

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Factors determining the structure and distribution of benthic invertebrate assemblages in a tropical basin

Moreno¹,

França²,

Ferreira³

et al. 2010

nbc

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“…Predominant land use in the river basin is row-crop agriculture and residential. The water quality of the river is being monitored (see references below) and some further data on macroinvertebrates (Ortiz et al, 2006) and fish (Aparicio et al, 2000;Sostoa et al, 2003) are available, particularly in one of its tributaries, Fuirosos stream (see Romaní et al, 2004;Domènech et al, 2006;and references therein).…”

Section: Field Studymentioning

confidence: 99%

Assessing fish metrics and biotic indices in a Mediterranean stream: effects of uncertain native status of fish

et al. 2008

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Implementation of the Water Framework Directive requires tools for measuring and monitoring the ecological status of aquatic ecosystems. Several indices are in use in the Iberian Peninsula, although there has been little comparison among them. We sampled the fish assemblage and limnological features of the Tordera stream (NE Spain) quarterly from September 2001 to May 2003 to evaluate the usefulness of several fish metrics and to compare habitat quality and biotic indices currently in use. Data for eight biotic and abiotic indices for this and three other Catalan river basins were also compiled in order to analyse the relationships among indices. In the Tordera stream, fish abundance and richness increased with stream order except in the last sampling site that had the lowest fish abundance owing to the effects of drought and water abstraction. Although most indices were positively correlated, some displayed low or null correlations particularly for the Tordera basin which is more affected by water abstraction and less by pollution; a commonly used physico-chemical index (ISQA) was the least correlated. In a regional fish index (IBICAT) under development, the brown trout (Salmo trutta) has been previously considered as introduced in the Tordera basin. Here, we report an old published record that demonstrates that trout was present before 1845 and we argue that its status should be considered as uncertain given the current information available. Whether brown trout is treated as native or introduced to this river basin has profound effects on the results of fish metrics because of its dominance in the upper reaches. We briefly discuss the role of introduced species, particularly in headwater streams, in the development of fish indices. Our study exemplifies the need for careful, basin-specific assessment of native/introduced status in the development of fish metrics.

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“…When the taxa richness of the benthic samples (Ortiz et al 2006) is analyzed the BMWP index is much higher than that recorded for the hyporheic samples. This reflects the relative scarcity of benthic macroinvertebrates in the hyporheic zone, the truncated functional biodiversity for these organisms and also the dominance of meiofauna in the sample that was not collected using a standard benthos net (the mesh being too coarse).…”

Section: Composition Of the Meiofauna And Its Relation To Hyporheic Pmentioning

confidence: 99%

Anthropic effects on the meiofauna and physicochemical characteristics of the hyporheic zone in a Mediterranean stream

Astiz¹,

Sabater²

2015

European Journal of Environmental Sciences

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We examined the effects of the discharge from a wastewater treatment plant (WWTP) on the interstitial water chemistry and structure of the hyporheos in two sections of the La Tordera stream, one upstream and one downstream of the effluent from the treatment plant. Interstitial water samples were collected to determine the vertical hydraulic gradient (VHG) and hydraulic conductivity (K) at six sites in each of the two sections on six occasions between November 2006 and September 2007. Samples of the interstitial meiofauna were collected in upwelling zones in both sections of the river. There were no patterns in the hydraulic gradient either in its direction or its magnitude along the longitudinal axis. There were no differences in VHG recorded at the sites sampled indicating that the two sections were similar in terms of geomorphology. The hydraulic conductivity was greatest in the control section (upstream of the effluent) of the stream. There were no significant differences in specific conductance, phosphates, nitrates or ammonia in the upwelling and downwelling zones. In the upwelling zones in the section of the river downstream from the effluent the concentrations of nitrates were greater than in the downwelling zones, but levels of phosphates and ammonia were lower. There was a decrease in the interstitial nutrient concentrations along a longitudinal gradient downstream of the effluent. A total of 24 taxa were collected from the hyporheos, with Chironomids and Oligochaetes being the most abundant groups. A higher Shannon diversity index (2.86) was recorded in the downstream section of the river even though a greater taxa richness (18) was recorded in the control section. This is probably due to the fact that a larger number of rare or unusual species was found in this section. According to the BMWP biological index the water quality in the control and downstream sections was polluted and heavily polluted, respectively. The shifts in hydraulic exchange processes and the bio-physicochemical environment of the hyporheic zone are the main effects of the discharge from the Santa Maria Palautordera wastewater treatment plant on the two sections of the river studied.

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Influences of a point source on the microhabitat distribution of stream benthic macroinvertebrates

Cited by 11 publications

References 0 publications

Factors determining the structure and distribution of benthic invertebrate assemblages in a tropical basin

Factors determining the structure and distribution of benthic invertebrate assemblages in a tropical basin

Assessing fish metrics and biotic indices in a Mediterranean stream: effects of uncertain native status of fish

Anthropic effects on the meiofauna and physicochemical characteristics of the hyporheic zone in a Mediterranean stream

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