Ecological status of the Pampean plain streams and rivers (Argentina)

Bauer, Delia Elena; Donadelli, Jorge Luis; Gómez, Nora; Licursi, Magdalena; Ocon, Carolina Silvia; Paggi, Analía Constancia; Capítulo, Alberto Rodrigues; Tangorra, Mariana

doi:10.1080/03680770.2001.11902584

Cited by 18 publications

(23 citation statements)

References 3 publications

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“…Bauer et al (2002) pointed out that since the urban streams of the pampean plain receive insufficiently treated wastewater and are affected by inputs groups of sites formed from water quality and habitats of LI, MI, and HI (Table 3). The density of Dero furcatus increased at the HI sites, whereas Aulodrilus pigueti and Trieminentia corderoi exibited high densities at the LI sites and disappeared entirely at sites with HI.…”

Section: Discussionmentioning

confidence: 99%

“…The pampean lowland streams furthermore exhibit an autochthonous primary production relying on algal and macrophyte communities plus autotrophic production-respiration ratios (Vilches and Giorgi, 2008) and are characterized by high nutrient levels relative to the values found in forested streams (Binkley et al, 2004), even in sites with low or moderate cattle raising and agriculture (Feijoó et al, 1999;Bauer et al, 2002).…”

Section: Water Qualitymentioning

confidence: 99%

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Different levels of taxonomic resolution in bioassessment: a case study of oligochaeta in lowland streams

et al. 2012

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Aim:This study evaluated the use of oligochaetes at different levels of taxonomic resolution as environmental indicators in Argentine lowland streams affected by different land uses. Methods: Sampling sites were grouped based on the physicochemical and habitat characteristics (low-, moderate-, and high-impact disturbance). Collection of the oligochaetes samples was carried out seasonally in sediment and vegetation habitats. Results: The increases in nutrients and organic matter produced elevated densities of the Oligochaeta, but when the disturbance also involved changes in the physical habitat or enhancements in toxic substances, the abundance decreased significantly to values even lower than those of non-impacted environments. The responses of Naidinae and Tubificinae were similar. The density of the Pristininae decreased with increasing impact, but those of the Enchytraeidae and Rhyacodrilinae increased at the most highly impacted sites. The Opistocystidae were not recorded in high-impact sites. Species richness and diversity (H') were lower in high-impact sites and even lower in sediments. Some species presented no restrictions in the habitat type or with the contamination level: Limnodrilus hoffmeisteri, Dero furcatus, D. digitata, D. pectinata, Pristina longiseta, and P. aequiseta. Moreover, Trieminentia corderoi, Slavina appendiculata, and Aulodrilus pigueti exhibited the highest abundances at low-impact sites and were not registered in high-impact sites. Conclusions: The Oligochaeta show a relatively wide ecological valence through their extensive number of species. Although lower taxonomic levels can give information about environmental status, test-species' sensitivities to different types and degrees of contamination will be of utmost relevance to the evaluation of ecological quality.Keywords: annelids, land use, habitat preferences, sediment, macrophyte.Resumo: Objetivo: Este estudo analisou as uso de oligoquetos em diferentes níveis de resolução taxonômica como indicadores ambientais em rios de planície Argentina afetadas por diferentes usos da terra. Métodos: Os sítios de amostragem foram agrupados com base nas características físico-químicas e habitat (perturbação baixa, moderada ou alta). Amostras de oligoquetos foram coletadas sazonalmente em habitats de sedimentos e vegetação. Resultados: Os aumentos de nutrientes e matéria orgânica resultaram em densidades elevadas de Oligochaeta, mas quando a perturbação também envolveu mudanças no habitat físico ou incrementos em substâncias tóxicas, a abundância diminuiu de forma significativa para valores ainda mais baixos que os de ambientes naõ perturbados. As respostas dos Naidinae e Tubificinae foram semelhantes. A densidade de Pristininae diminuiu com o aumento da perturbação, mas as densidades de Enchytraeidae e Rhyacodrilinae aumentaram nos locais mais altamente perturbados. Os Opistocystidae não ocorreram em locais de alta perturbação. A riqueza de espécies e a diversidade (H') foram menores em locais de perturbação elevada e ainda mais b...

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Section: Discussionmentioning

confidence: 99%

Section: Water Qualitymentioning

confidence: 99%

Different levels of taxonomic resolution in bioassessment: a case study of oligochaeta in lowland streams

et al. 2012

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“…Another three channels (HIGH treatment) were exposed to a 4°C increase in temperature, 300% increase in nutrients (SRP and DIN), 50% increase in suspended solids and 20% increase in water velocity. The temperature increase was selected to represent the maximum increment predicted by the climatic models of the region (Hulme & Sheard, 1999), while the nutrients, turbidity and water velocity increments are among the largest values measured in different sites throughout the Pampean streams (Gómez & Licursi, 2001;Gómez et al, 2008;Bauer et al, 2002;Giorgi et al, 2005;Licursi, 2005;Licursi & Gómez, 2009). The final three channels (LOW treatment) were exposed to intermediate levels of the manipulated variables: a 1°C increase in temperature, 50% increase in nutrients (SRP and DIN), 15% increase in suspended solids and 5% increase water velocity.…”

Section: Methodsmentioning

confidence: 99%

“…These streams show a relatively high concentration of nutrients when they are compared with other lotic systems of the world (Bauer et al, 2002, Giorgi et al, 2005, and can be classified as eutrophic when phosphorus is considered, or as mesotrophic when nitrogen is taken into account (Feijó & Lombardo, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…To this end we conducted a laboratory experiment simulating two environmental conditions (LOW treatment and HIGH treatment) employing epipelic biofilm from a mesotrophic Pampean stream (the "Martin" stream). The manipulated temperatures were selected to represent the both the maximum increment predicted by the climatic models of the region (Hulme & Sheard, 1999) in the HIGH treatment and an intermediate situation in the LOW treatment; the nutrients (phosphorous and nitrogen), turbidity and water velocity increments in the HIGH treatment are among the largest values measured in different sites throughout the Pampean streams (Gómez & Licursi, 2001;Gómez et al, 2008;Bauer et al, 2002;Giorgi et al, 2005;Licursi, 2005;Licursi & Gómez, 2009), and in the LOW treatment these variables were increased in an intermediate level between the controls and the HIGH treatment.…”

Section: Introductionmentioning

confidence: 99%

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Changes in the epipelic diatom assemblage in nutrient rich streams due to the variations of simultaneous stressors

2015

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Please cite this article as: Cochero, J., Licursi, M., Gómez, N.,Changes in the epipelic diatom assemblage in nutrient rich streams to the variations of simultaneous stressors, Limnologica (2014), http://dx.doi.org/10.1016/j.limno. 2014.10.004 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. A c c e p t e d M a n u s c r i p t results suggest that, in the very short term of the bioassay conducted, the diatom assemblage can modify its structure to respond in a sensitive manner to the abrupt changes in multiple physical-chemical variables.

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