Concepts in river ecology: pattern and process in the catchment hierarchy

Townsend, Colin R.

doi:10.1127/lr/10/1996/3

Cited by 65 publications

(83 citation statements)

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“…These environmental factors show very diverse ranges, from physical, chemical, and biological characteristics in streams or rivers, to climate, land use, and geomorphology in watershed (Stevenson and Pan, 1999). Frissell et al (1986) proposed the idea of a hierarchical, landscapescale view of stream habitat, which provides a useful conceptual context for many aspects of both basic and applied stream ecology (Poff and Ward, 1990;Townsend, 1996;Poff, 1997). Poff (1997) developed a concept of multi-scale habitat filters and functional organization in streams, specifying a set of four habitat levels, including watershed, reach, channel unit, and microhabitat.…”

Section: Discussionmentioning

confidence: 99%

“…Poff (1997) proposed multi-scale habitat filters and functional organization in streams, specifying a set of four habitat levels (watershed, reach, channel unit, and microhabitat). However, slightly different numbers of levels and diversity of elements within levels have been described by other authors (Gregory et al, 1991;Townsend, 1996). Landscape features affect small-scale factors, such as microhabitat conditions and water quality, which are important to the distribution and abundance of organisms.…”

Section: Introductionmentioning

confidence: 99%

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Relationships between three major stream assemblages and their environmental factors in multiple spatial scales

Bae

Kwon

Hwang

et al. 2011

Ann. Limnol. - Int. J. Lim.

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-This study investigated the relationships of three major aquatic assemblages (diatom, macroinvertebrate, and fish) and environmental variables, including sub-basin, hydrology, land cover, and water quality variables on multiple scales. Samples were collected at 720 sampling sites on the Korean nationwide scale. Geological variables, including altitude and slope, showed a strong positive correlation with proportions of forest in land cover types and cobbles in substrates, while they were negatively correlated with water quality variables, including conductivity and total phosphorus. Considering the concordance of the different assemblages, species richness of fish and macroinvertebrates displayed significant correlation, and diatoms were significantly correlated with fish. However, diatoms did not show significant correlation with macroinvertebrates. Altitude and slope showed significant correlation with all biological variables of the three assemblages. Macroinvertebrates and fish showed positive relations with large substrate sizes. Indices of diatoms and macroinvertebrates well reflected the perturbation of water quality variables. However, fish indices showed a relatively low association with water quality variables, compared with those of diatoms and macroinvertebrates. These patterns were also confirmed by the ordination and prediction of biological indices with environmental variables through the learning process of a self-organizing map as well as random forest. Overall, our study supports the concept of multi-scale habitat filters and functional organization in streams, and is consistent with the recommended use of multiple biological indices with more than one assemblage for the assessment of the biotic integrity of aquatic ecosystems.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Relationships between three major stream assemblages and their environmental factors in multiple spatial scales

Bae

Kwon

Hwang

et al. 2011

Ann. Limnol. - Int. J. Lim.

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“…It makes interactions between the aquatic and terrestrial environment possible (Junk et al, 1989), regulates the model of the aquatic communities (Quirós & Baigún, 1985;Townsend, 1996;Rodrigues et al, 2002), propitiates the high diversity of the lotic environment associated to the floodplain because of the elevated heterogeneity of the habitat (Luiz et al, 2004;Thomaz et al, 2007), including in clear water rivers (sensu Sioli, 1984), such as the Mortes River, characterized by a low concentration of nutrients, but that support a rich aquatic flora and fauna (Goulding, 1993). It also modifies the limnological characteristics of rivers because of the quantities of organic matter received from the floodplain (Townsend, 1996), and influences the fish-environmental parameter relationship (Lin & Caramaschi, 2005). However, Junk & Wantzen (2003) state that systematized and detailed studies about the influence of the hydrology and hydrochemical parameters on flora and fauna of Neotropical rivers with a floodplain are scarce.…”

Section: Introductionmentioning

confidence: 99%

Influence of environmental parameters on fish assemblage of a neotropical river with a flood pulse regime, Central Brazil

2009

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This study aims to determine which of twelve environmental parameters (five physicochemical and seven hydromorphological) influence on the fish assemblage structure of the lower Mortes River basin located in the Bananal floodplain of the Araguaia River basin, Central Brazil. Sampling was conducted in six stretches of 1000 m each during the high and low waters. Fish were captured using gill nets and environmental parameters were measured by portable equipment or determined visually. The coinertia analysis indicated that two physicochemical (dissolved oxygen and water transparency), and four hydromorphological (channel width and depth, riparian vegetation cover and type of the riverside substrate) parameters structure the fish assemblages, both driven by the regional hydrological patterns (flood pulse). These results are explained by fish-environmental parameters relationship characteristic of the aquatic Neotropical systems.Este estudo determinou quais entre doze parâmetros ambientais (cinco físico-químicos e sete hidromorfológicos) influenciam na estrutura da assembleia de peixes do baixo rio das Mortes localizado na planície de inundação do Bananal, bacia do rio Araguaia, Brasil Central. As coletas foram realizadas em seis trechos de 1000 m cada durante os períodos de chuva e estiagem, nos quais 1036 peixes foram coletados utilizando-se redes de malhar e medidos os parâmetros ambientais utilizando equipamentos portáteis ou determinados visualmente. A análise de coinércia indicou que dois parâmetros físicos e químicos (oxigênio dissolvido e a transparência da água) e quatro hidromorfológicos (largura e profundidade da calha principal, cobertura da mata ripária e tipo de substrato da margem) estruturam a assembleia de peixes, ambos influenciados pelo regime hidrológico regional (pulso de inundação). Estes resultados são discutidos considerando a interação entre peixes e os parâmetros ambientais característicos dos sistemas aquáticos Neotropicais.

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“…Despite the wide use of the river continuum as a conceptual framework for understanding various riverine processes, it has been criticized for overlooking an increasingly recognized reality that specific rivers are often divided into discrete segments that are hierarchically nested in a river network (Townsend, 1996;Poole, 2002). Discrete segments along a river network can occur as a result of "abrupt transitions between adjacent segments with dissimilar physical structure" within the 180 hierarchically nested river network (Poole, 2002).…”

Section: Conceptual Framework For Understanding Interactive Effects Omentioning

confidence: 99%

Reviews and syntheses: Anthropogenic perturbations to carbon fluxes in Asian river systems: Concepts, emerging trends, and research challenges

Park¹,

Nayna²,

Begum³

et al. 2018

Preprint

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Abstract. Human activities are drastically altering water and material flows in river systems across Asia. These anthropogenic perturbations have rarely been linked to the carbon (C) fluxes of Asian rivers that may account for up to 40-20 50% of the global fluxes. The primary object of this review was to provide a conceptual framework for assessing human impacts on Asian river C fluxes, along with a latest update on anthropogenic alterations of riverine C fluxes, focusing on the impacts of water pollution and river impoundments on CO2 outgassing from the rivers draining South, Southeast, and East Asian regions that account for the largest fraction of river discharge and C exports from Asia and Oceania. Recent booms in dam construction across Asia have created a host of environmental problems; yet only a small number of studies have 25 explicitly investigated altered rates of greenhouse gas (GHG) emissions and organic C transport. There have been contrasting reports on impoundment effects: decreases in GHG emissions in the reservoirs exhibiting enhanced primary production vs. increased emissions from the flooded vegetation and soils in the early years following dam construction or from the impounded river reaches and downstream estuaries during the monsoon period. These contrasting results suggest that the rates of metabolic processes in the impounded and downstream reaches can greatly vary longitudinally over time, as 30 a combined result of diel shifts in the balance between autotrophy and heterotrophy, seasonal fluctuations between the dry and monsoon periods, and a long-term change from a leaky post-construction phase to a gradual C sink. Rapid pace of urbanization across southern and eastern Asian regions has dramatically increased municipal water withdrawal, generating annually 120.2 km 3 of wastewater in 24 countries, which comprises 38.6% of the global municipal wastewater production disproportionately affect the receiving river water, particularly downstream of rapidly expanding metropolitan areas, including eutrophication, increases in the amount and lability of organic C, and pulse emissions of CO2 and other greenhouse gases (GHGs). As reviewed for three representative rivers (the Ganges, Mekong, and Yellow River), the lower reaches of these rivers and their polluted tributaries tend to exhibit higher levels of organic C and the partial pressure of CO2 (pCO2) than the eutrophic reservoirs and less impacted upstream reaches. More field measurements of pCO2, together with accurate 40 flux calculations based on river-specific model parameters, are urgently required to provide more accurate estimates of GHG emissions from the Asian rivers that are now underrepresented in the global C budgets. Researchers working on individual river systems need to be linked to collaborative research networks to facilitate global synthesis of local field data. These synthesis efforts, combined with conceptual and mathematical models, will contribute to a better understanding of how anthropogenic perturbations in rapidly urb...

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Concepts in river ecology: pattern and process in the catchment hierarchy

Cited by 65 publications

References 0 publications

Relationships between three major stream assemblages and their environmental factors in multiple spatial scales

Relationships between three major stream assemblages and their environmental factors in multiple spatial scales

Influence of environmental parameters on fish assemblage of a neotropical river with a flood pulse regime, Central Brazil

Reviews and syntheses: Anthropogenic perturbations to carbon fluxes in Asian river systems: Concepts, emerging trends, and research challenges

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