Spatial Pattern and Habitat Requirements of Galaxias maculatus in the Last Un-Interrupted Large River of Patagonia: A Baseline for Management

Tagliaferro, Marina; Quiroga, Analía Pamela; Pascual, Miguel

doi:10.5539/enrr.v4n1p54

Cited by 9 publications

(8 citation statements)

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“…Our work was in part facilitated by the general homogeneity of the Santa Cruz River, which has been previously recognized by Tagliaferro et al (2013Tagliaferro et al ( , 2014a, when reporting data on macroinvertebrates and native fish. The Santa Cruz has no secondor third-order tributaries, where the highest abundance of juvenile salmonids is found in other rivers around the world (Murphy et al, 1989;Boughton et al, 2009).…”

Section: Discussionmentioning

confidence: 92%

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Dams versus habitat: predicting the effects of dams on habitat supply and juvenile rainbow trout along the Santa Cruz River, Patagonia

et al. 2015

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Because of their remote location and lack of supporting infrastructure, large glacial rivers of southern Patagonia have remained free of dams. But this is bound to change: two dams proposed for the Santa Cruz River would supply 16% of Argentina's hydropower and five dams planned for the Pascua and Baker Rivers could supply over 20% of Chile's hydropower. In this paper, we project the losses of habitat and juvenile Oncorhynchus mykiss, a recreationally important species, following the construction of the two dams in the Santa Cruz River. We applied a two-stage fitting approach, using generalized additive models and generalized lineal models (GLMs) sequentially to describe habitat-species relationships based on data collected through an intensive field survey of fish and environmental variables along 310 km of river. A simplified GLM trout model based on wetted width, substrate size, and river kilometer was selected which represents the observed geographic distribution very well and with the lowest predictive error. Based on this model, we estimated that habitat supporting 86% of current juvenile trout production will be lost to flooding by the dams. Our data generate a rare opportunity to perform a dam impact assessment by comparison with potential post-dam conditions.

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Section: Discussionmentioning

confidence: 92%

“…In this paper, we report on catches of juvenile rainbow trout. See Tagliaferro et al (2014a) for a report of the native fish Galaxias maculatus.…”

Section: South Americamentioning

confidence: 98%

Dams versus habitat: predicting the effects of dams on habitat supply and juvenile rainbow trout along the Santa Cruz River, Patagonia

et al. 2015

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“…The Santa Cruz is a remote river, far from populated areas, with very low incidence of industrial and urban pollution along its main course. Fish were captured using standard single‐pass electrofishing procedures by a Smith‐Root LR‐24 electrofisher set to a frequency of 90 Hz and a pulse width of 3 ms (Tagliaferro, Quiroga, & Pascual, 2014). Fish were euthanized with an overdose of MS222 and collected in sterile containers, in which they were transported and were kept refrigerated until processing.…”

Section: Methodsmentioning

confidence: 99%

Antimicrobial activity of bacteriocin‐producing Carnobacterium spp. isolated from healthy Patagonian trout and their potential for use in aquaculture

et al. 2020

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Aquaculture, which represents 47% of global fish production, is quickly becoming the primary source of fish for human consumption (FAO, 2018). However, aquaculture development faces a number of challenges, such as climate change and increased disease rates (FAO, 2018). Thus, the intensification of culture systems to meet the growing global demand has led to the emergence of bacterial diseases with substantial economic losses for farmers (Hoseinifar, Sun, Wang, & Zhou, 2018). Antibiotics have been widely used in the fight against these infections. However, overreliance on antibiotics as an outbreak prevention and treatment strategy has led to the emergence of antibiotic-resistant bacterial strains and to the accumulation of antibiotics in the tissue of cultured organisms, making them unsuitable for human consumption (Romero, Feijoó, & Navarrete, 2012). An environmentally friendly alternative to antibiotics is the use of beneficial bacteria, namely probiotics. A probiotic is defined as a live

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“…Entre las principales problemáticas ambientales que enfrenta la provincia de Santa Cruz se pueden mencionar la actividad minera, la ganadería extensiva de ganado ovino y bovino, la falta de planificación en el desarrollo urbano, el vertido de efluentes urbanos e industriales al medio y las represas hidroeléctricas actualmente en construcción sobre el río Santa Cruz (Martin et al, 2014;Tagliaferro et al, 2013;Tagliaferro et al, 2014). Estas actividades afectan de manera negativa a los cuerpos de agua dulce de la provincia, recurso de por sí escaso en la región.…”

Section: Introductionunclassified

Análisis de la calidad ambiental en un sector del Río Chico (Santa Cruz, Argentina) basado en bioindicadores bentónicos

Torres¹,

Martín²,

Gárgano³

et al. 2019

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El río Chico, ubicado en el centro de Santa Cruz, recorre 600 km desde sus nacientes hasta sudesembocadura. En su tramo medio, se encuentra la localidad de Gobernador Gregores(48°45'3"S, 70°14'54"O), que ejerce su influencia sobre el río a través de las actividadesagropecuarias y el vertido de efluentes urbanos. Con el objetivo de conocer el grado deimpacto sobre la calidad del agua del río, se realizó un análisis de la comunidad demacroinvertebrados bentónicos y se calculó el índice Biotic Monitoring Patagonian Streams(BMPS). En marzo de 2017, se efectuó un primer relevamiento en seis estaciones de muestreodispuestas en un diseño de gradiente de impacto, con dos estaciones control aguas arriba de lalocalidad y cuatro estaciones aguas abajo. En cada estación se tomaron muestras de agua paraanálisis fisicoquímicos, se registraron datos ambientales mediante sonda multiparamétrica yse recolectaron cuatro muestras de macrobentos utilizando una red Surber con malla de 0,5mm de abertura. Los organismos recolectados fueron identificados y contabilizados bajomicroscopios estereoscópico y óptico. Para cada muestra se calculó el número de taxones (S),la abundancia total (N), la diversidad (H’) y la equitatividad (J); los datos de abundancia seanalizaron utilizando estadística multivariada. Se identificaron 25 taxones, siendo los mejorrepresentados los oligoquetos Naididae, los hirudíneos, los moluscos Chilinidae yLymnaeidae, y los insectos Chironomidae, Baetidae y Glossosomatidae. En las estacionesubicadas aguas abajo más cercanas a la localidad, la comunidad se encontró dominadaampliamente por oligoquetos y quironómidos, y presentó los valores más bajos de S, H’ y J.Los valores de BMPS en esas estaciones indicaron la existencia de aguas contaminadas afuertemente contaminadas. En las estaciones control y las más alejadas aguas abajo, losvalores de S, H’ y J aumentaron significativamente y el índice BMPS indicó mejorescondiciones en la calidad ambiental del río.

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Spatial Pattern and Habitat Requirements of Galaxias maculatus in the Last Un-Interrupted Large River of Patagonia: A Baseline for Management

Cited by 9 publications

References 40 publications

Dams versus habitat: predicting the effects of dams on habitat supply and juvenile rainbow trout along the Santa Cruz River, Patagonia

Dams versus habitat: predicting the effects of dams on habitat supply and juvenile rainbow trout along the Santa Cruz River, Patagonia

Antimicrobial activity of bacteriocin‐producing Carnobacterium spp. isolated from healthy Patagonian trout and their potential for use in aquaculture

Análisis de la calidad ambiental en un sector del Río Chico (Santa Cruz, Argentina) basado en bioindicadores bentónicos

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