Patrones de distribución espacial de ensambles de macroinvertebrados bentónicos de un sistema fluvial Andino Patagónico

Moya, Carolina; Valdovinos, Claudio; Moraga, Andrés; Romero, Francisco; Debels, P.; Oyanedel, Alejandra

doi:10.4067/s0716-078x2009000300009

Cited by 26 publications

(28 citation statements)

References 42 publications

(18 reference statements)

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“…Esto puede explicarse a partir de que estas plantas generan una mayor disponibilidad de recursos tanto alimenticio como de refugio (Esteves, 1998;Flory & Milner, 1999;Moya et al, 2009). Conjuntamente con el aumento en la abundancia CUADRO 6 Coeficiente de correlación de Kendall no paramétrico entre las variables químicas del agua de estos macroinvertebrados, se incrementó la abundancia de Hydrobiosidae y Glossiphonidae, ambos considerados depredadores.…”

Section: Discusionunclassified

Patrones espaciales en comunidades de macroinvertebrados acuáticos de la Puna Argentina

Nieto

2016

RBT

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Spatial patterns in communities of aquatic macroinvertebrates of Argentinean Puna. The macroinvertebrates are a vital component of freshwater ecosystems as they contribute to the process of organic matter while serving as food for other organisms such as fish and amphibians. Unfortunately, the knowledge of the aquatic diversity is poor in the high Andean systems (between 3 200 and 5 200 m.a.s.l. and rainfall below 300 mm per year), especially in the Argentinean peatbogs, a fact which has made difficult the interpretation of spatial patterns on a regional scale. The present study aimed to describe the composition of aquatic macroinvertebrates in seven peatbogs in the Argentinean Puna, and to analyze for the first time their spatial patterns. For this, we studied the relationship of these organisms with the environment, and obtained information about the surrounding vegetation and water physico-chemical characteristics. A total of 3 131 specimens of aquatic macroinvertebrates were collected, representing 25 taxa belonging to 22 families and 24 genera. In addition, 62 species of vascular plants were recorded, belonging to 20 families. The most abundant life form were the tufted grasses, followed by cushions. By using an NMDS (Non-Metrical Multidimensional Scaling) statistical analysis, the sampling sites were ordered in each peatbog as follows. The peatbogs located furthest West and South with higher water temperature were grouped on axis 1, whereas those with higher conductivity, whole water dissolved solids and salt concentration were grouped on axis 2. The water temperature was higher than air temperature at all times, and we found no association between temperature and altitude. The altitude had no correlation with the abundance of macroinvertebrates or with plant richness. Life forms such as scattered graminoids, trailing and prostrate herbs (in many cases they get into the channel) and aquatic plants were more abundant in peatbogs 4, 5 and 7 and they had a correlation with some macroinvertebrates belonging to functional trophic groups such as filter-collectors, collectors and scrapers. Finally, conductivity, whole dissolved solids and salt concentration had their highest value in peatbog 6, where Bivalvia (filter-collector) and Hyalella (collector) were also found. The results obtained attest that these macroinvertebrates displayed diversity and composition spatial patterns, the most important feature being their relationship with the surrounding vegetation, and to a lesser extent, with the physical and chemical traits of water in seven fertile lowlands in the Argentinean Puna. Rev. Biol. Trop. 64 (2): 747-762. Epub 2016 June 01.

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Section: Discusionunclassified

Patrones espaciales en comunidades de macroinvertebrados acuáticos de la Puna Argentina

Nieto

2016

RBT

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“…The area is characterized by a remarkable, permanent salinity minimum caused by high discharge of river fluxes. One of the largest rivers of southern Chile in terms of volume is the Baker River basin, 26 726 km 2 (Moya et al 2009). It has a nival regimen with maximum freshwater discharge during the austral summer, when ice melting takes place (river flux around 100-250 m 3 s −1 , Dávila et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Larval fish distribution, growth and feeding in Patagonian fjords: potential effects of freshwater discharge

et al. 2011

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In fjord systems, freshwater inputs occur by ice melting and river discharge, affecting seawater salinity along fjord and adjacent waters, and potentially the ecology of early life stages of marine fish occurring in the area. During austral spring 2008, a bio-oceanographic cruise was carried out in southern Chile between 47°00′ and 50°09′S, an area influenced by Baker River discharge and ice melting of Northern and Southern Ice Fields, the largest glaciers from Patagonia. Surface salinity and temperature ranged from 1.22 to 32.80, and from 8.11 to 10.68°C, respectively. Larval lightfish Maurolicus parvipinnis (Sternoptychidae) and Falkland sprat Sprattus fuegensis (Clupeidae) were the dominant species, with abundances of 2.2-39.9 larvae 10 m −2 and 3.4-77.1 larvae 10 m −2 , respectively. Postflexion stages of both species were collected mainly in surface density fronts. Otolith-based growth analyses estimated linear growth rates of 0.136 mm day −1 for M. parvipinnis of 4.1-15.1 mm, and 0.448 mm day −1 for S. fuegensis of 5.4-20.5 mm. Recent Otolith Growth Index (ROGI), based on the residual analysis of the relationship between increment width of outermost five microincrements and otolith radius, indicates that larval M. parvipinnis collected in low salinity waters showed a reduction of its recent growth rate compared those collected in saltier waters. Also, ROGI was positively correlated with salinity of the water column for larval M. parvipinnis. Gut content analysis showed that large larvae collected near sources of freshwater had lower number of prey in its guts and preyed on different items than fish larvae collected in saltier waters. Therefore, freshwater inputs from rivers and glaciers from Patagonia affected horizontal distribution, recent growth and feeding of larval fish in fjords and channels of southern Chile.

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“…The highest values were recorded in winter at stations 3 and 4 (Table 5). (Moya et al 2009b). It may even be compared to a basin which is four times larger, the Damas River basin covering 51,400 ha, where 14 stations were sampled (Figueroa et al 2003), showed the same number of taxa as was recorded in the Boroa basin.…”

Section: Index Bioticmentioning

confidence: 99%

“…In the south-central zone of Chile (36°S to 47°S), studies of macroinvertebrates have been carried out in several regions: Biobío (Habit et al 1998, Valdovinos 2001, Moya et al 2009a, Araucanía (Leiva 2004), Los Ríos (GuevaraCardona et al 2006), and Carlos Ibañez del Campo (Mercado & Elliott 2006, Oyanedel et al 2008, Moya et al 2009b; the majority of which only analyzed the structure of the ensemble of macroinvertebrates.…”

Section: Introductionmentioning

confidence: 99%

Benthic macroinvertebrate assemblages as indicators of water quality applying a modified biotic index in a spatio-seasonal context in a coastal basin of Southern Chile

Fierro

Bertrán

Peña‒Cortés

et al. 2012

Rev. biol. mar. oceanogr.

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Resumen.-Se caracterizó la calidad del agua en un río del sur de Chile a través de un Índice Biótico, en un contexto espacio-temporal y además se analizó la composición y distribución de macroinvertebrados bentónicos y su correlación con 14 parámetros físico-químicos. La toma de muestras ocurrió durante un año en 5 estaciones de muestreo en la cuenca del río Boroa. Se registró un total de 77 taxa, los órdenes más representativos fueron Ephemeroptera (43,30%), Diptera (24,16%) y Plecoptera (18,03%). Las especies más abundantes fueron Meridialaris diguillina, Nousia maculata (Ephemeroptera) y Limnoperla jaffueli (Plecoptera). Acordando al IBF modificado (Índice Biótico de Familias) los resultados indicaron excelente, muy buena y buena calidad de agua, la última calidad fue registrada principalmente en invierno. Los parámetros fisicoquímicos así mismo indicaron calidad de agua excepcional. Estos resultados indican un bajo nivel de impacto antropogénico en la cuenca. Al aplicar el Índice Biótico de Hilsenhoff modificado basado en macroinvertebrados, la influencia de la estacionalidad sobre la calidad del agua fue evidente. Palabras clave: Estacionalidad, ríos chilenosAbstract.-The water quality in a Southern Chile river was characterized using the Biotic Index in a spatioseasonal context, to analyze the composition and distribution of benthic macroinvertebrates and their correlation with 14 physico-chemical parameters. Sampling was done over a year at 5 sampling stations in the basin of the Boroa River. A total of 77 taxa were recorded, with the most represented orders being the Ephemeroptera (43.30%), Diptera (24.16%) and Plecoptera (18.03%). The most abundant species were Meridialaris diguillina, Nousia maculata (Ephemeroptera) and Limnoperla jaffueli (Plecoptera). According to the modified FBI (Family Biotic Index), the findings indicated excellent, very good and good water quality, the latter quality being registered principally in winter. Likewise, the physico-chemical parameters indicated exceptional water quality. These results suggested a low level of anthropogenic impact in the basin. Applying the modified Hilsenhoff Biotic Index based on macroinvertebrates, the influence of seasonality on water quality was evident.

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Patrones de distribución espacial de ensambles de macroinvertebrados bentónicos de un sistema fluvial Andino Patagónico

Cited by 26 publications

References 42 publications

Patrones espaciales en comunidades de macroinvertebrados acuáticos de la Puna Argentina

Patrones espaciales en comunidades de macroinvertebrados acuáticos de la Puna Argentina

Larval fish distribution, growth and feeding in Patagonian fjords: potential effects of freshwater discharge

Benthic macroinvertebrate assemblages as indicators of water quality applying a modified biotic index in a spatio-seasonal context in a coastal basin of Southern Chile

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