Effects of natural and anthropogenic environmental changes on riverine fish assemblages: a framework for ecological assessment of rivers

Tejerina‐Garro, Francisco Leonardo; Maldonado, M.; Ibáñez, Carla; Pont, Didier; Roset, Nicolas; Oberdorff, Thierry

doi:10.1590/s1516-89132005000100013

Cited by 113 publications

(94 citation statements)

References 101 publications

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“…Entre las tres variables seleccionadas (i.e. ancho de río, profundidad y distancia a la fuente de colonización) solo la variable "ancho del río" entra de manera significativa en el modelo, explicando el 13 % de la variación total de la riqueza, esta variable puede ser usada como una medida sintética del tamaño y la diversidad de hábitats disponibles (Tejerina-Garro et al, 2005). Sin embargo, como esta variable no tiene correlación significativa con la altura (r = -0.20; p > 0.05) parece actuar solo al nivel local (del sitio) y no a la escala del gradiente altitudinal.…”

Section: Resultsunclassified

“…La primera es que los muestreos se realizaron en una sola época (época seca), por lo que sería importante realizar muestreos en la época de lluvias para confirmar los patrones encontrados, sin embargo debemos mencionar que los muestreos en época de lluvias podrían subestimar las poblaciones de peces debido a los grandes volúmenes de agua. La segunda es que no se tomaron en cuenta variables como el sustrato y la velocidad de la corriente que se sabe que actúan sobre la distribución local de las comunidades de peces (Tejerina-Garro et al, 2005). Sin embargo, estas variables no deberían influir de gran manera ya que en los arroyos andinos el sustrato y la velocidad son generalmente homogéneos (sustrato grueso y velocidades altas) (Jacobsen, 2008).…”

Section: Resultsunclassified

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¿Qué factores determinan la distribución altitudinal de los peces de ríos tropicales andinos?

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et al. 2016

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Altitudinal gradients represent an appropriate system to assess whether there is a relationship between richness patterns, environmental variables, and the ecological processes that determine the species type and number inhabiting a given area. In mountain streams freshwater fishes, the most prevalent relationship is a monotonic decrease in species richness with elevation. The objective of this study was to evaluate four hypotheses that can explain the negative relationship between local fish species richness and altitude, 1) the hypothesis of decreasing energy availability, 2) the hypothesis of increasing climate severity, 3) the hypothesis of habitat diversity, and 4) the hypothesis of isolation by physical severity of the environment. Fish and macro-invertebrates were collected following standard methods from 83 sites (between 200-4 000 meters) of two river basins in the Bolivian Amazon. The first hypothesis was tested by analyzing relationships between the density of macro-invertebrates, the richness of invertivorous fish species and altitude; while the second and third hypotheses were assessed by a multiple regression analysis (GLM) between fish species richness and several local and regional factors. Besides, assemblage dissimilarity between sites along the altitudinal gradient was analyzed using βsim and βness indices. Fish richness decreases linearly with increasing altitude. The density of macro-invertebrates tends to increase at higher altitudes, contrary to invertivorous fish species richness, suggesting that energy availability is not a limiting factor for fish species colonization. The GLM explained 86 % of the variation in fish species richness, with a significant contribution of water temperature, maximum slope in the river mainstem, and stream width. There is a higher species turnover (βsim) between sites at low elevation. Inversely, βness shows higher values in the upper parts, corresponding to change in assemblages mainly due to species loss. Taken together, these results suggest that climatic and physical severities create strong barriers to colonization, further explaining the decrease in fish richness along the altitudinal gradient.

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¿Qué factores determinan la distribución altitudinal de los peces de ríos tropicales andinos?

Barra

Zubieta

Aguilera

et al. 2016

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“…Sutherland et al (2002) and Casatti (2004) reported decreased fish species richness and changes in local abundance associated with increased sediment loads in rivers. At the local level (tributary or reach) other factors are critical to maintain the fish communities, such as depth and substrate composition (Schlosser, 1991) or the variability and fluctuations in the physical and chemical characteristics (Tejerina-Garro et al, 2005).…”

Section: Discussionmentioning

confidence: 99%

Integrity of fluvial fish communities is subject to environmental gradients in mountain streams, Sierra de Aroa, north Caribbean coast, Venezuela

et al. 2006

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We examined physical habitat and fish assemblages in rivers of the Aroa Mountains (Venezuela) with different levels of environmental protection due to the creation of Yurubí National Park within the drainage. We developed an Index of Biotic Integrity (IBI) and evaluated it using principal components analysis (PCA) and canonical correspondence analysis (CCA). Tributary rivers were divided into classes according to their origin (protected by the park) and physical characteristics of each, including substrate. Fishes were captured using standardized electrofishing. Fish communities showed greater species richness in heterogeneous habitat and protected rivers but overall abundance was higher in unprotected and impacted rivers. The IBI was sensitive to these differences and the scores were higher in protected rivers. The IBI detected degree of disturbance of fish communities without direct consideration of habitat parameters measured. The PCA revealed a gradient in substrate heterogeneity. Similarly, CCA revealed differences in fish assemblage composition along the environmental gradient and that varied with protection status of the river. The relationship between PCA and IBI scores was highly significant (r² = 0.61, P < 0.0001). The PCA and CCA analysis moderately validated the structure and predictability of IBI; but it is still necessary to refine the model and to extend its application for more time and over a wider area.
Foram avaliados o ambiente físico e as assembléias de peixes em rios das montanhas Aroa (Venezuela) com diferentes níveis de proteção ambiental devido a criação do Parque Nacional Yurubí nesta drenagem. Foi desenvolvido um Índice de Integridade Biótica (IBI), avaliado através da análise de componentes principais (PCA) e análise de correspondência canônica (CCA). Rios tributários foram divididos em classes, de acordo com sua origem (proteção pelo Parque) e características físicas, incluindo o substrato. Peixes foram capturados utilizando-se pesca-elétrica padronizada. As comunidades de peixes mostraram maior riqueza de espécies em habitats heterogêneos e rios protegidos, porém a abundância foi maior em áreas não protegidas e rios não impactados. O IBI foi sensível a estas diferenças e os escores foram mais elevados em rios protegidos. O IBI detectou o grau de distúrbio nas comunidades de peixes sem a consiedração direta dos parâmetros de habitat medidos. O PCA revelou um gradiente de heterogeneidade no substrato. De modo similar, a CCA revelou diferenças na composição da assembélia de peixes ao longo do gradiente ambiental que variou com o estatus de proteção do rio. A relação entre os escores de PCA e IBI foi altamente significativa (r² = 0.61, P < 0.0001). As análises de PCA e CCA validaram moderadamente a estrutura e a previsibilidade do IBI; porém, é necessário refinar o modelo e estender este aplicativo por mais tempo e área mais abrangente

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“…These activities lead to a decrease in water quality and in the diversity of biological communities, due to changing physical and chemical variables (Goulart and Callisto, 2003;Sabater et al, 2000;Tejerina-Garro et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

The fish community as an indicator of biotic integrity of the streams in the Sinos River basin, Brazil

2010

Braz. J. Biol.

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The basin of the Sinos River, located in the northeastern part of Rio Grande do Sul state, Brazil, has been highly impacted by industrial and urban activities. Water quality is low because of domestic and industrial sewage discharges. Most of the tributaries have suffered drastic structural interventions like canalisations and the removal of riparian vegetation. The aims of this study were to: 1) assess the diversity of fish at 34 sampling sites in twenty-four tributaries of the Sinos River basin; 2) quantify impact level by the Shannon-Wiener diversity index and an adapted Index of Biotic Integrity (IBI); and 3) check the interference of environmental impacts, formerly quantified in a Stream Corridor Assessment Survey (SCAS), on the fish assembly and 4) compare the relationship between the IBI with stream order. Fish sampling was performed by electric fishing in the period from April 2004 to August 2006. A total of 4,869 individuals were sampled, representing 61 species, 14 families and six orders. Significant relationships of the Shannon-Wiener index and IBI with SCAS scores and stream orders were found. Of all impacts that make up the SCAS score, only channel modifications were significantly correlated with IBI. These results indicate that the adaptation of the IBI was effective and performed better than the Shannon-Wiener diversity index when related directly to specific impact categories. The application of the IBI with the SCAS and the other variables was efficient in the tributaries of the Sinos River basin because it showed the biotic degradation in accordance with changes in physical habitat. Keywords

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Effects of natural and anthropogenic environmental changes on riverine fish assemblages: a framework for ecological assessment of rivers

Abstract: ABSTRACT

Cited by 113 publications

References 101 publications

¿Qué factores determinan la distribución altitudinal de los peces de ríos tropicales andinos?

¿Qué factores determinan la distribución altitudinal de los peces de ríos tropicales andinos?

Integrity of fluvial fish communities is subject to environmental gradients in mountain streams, Sierra de Aroa, north Caribbean coast, Venezuela

The fish community as an indicator of biotic integrity of the streams in the Sinos River basin, Brazil

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