Impact of iron ore mining on suspended sediment response in a tropical catchment in Kudremukh, Western Ghats, India

Krishnaswamy, Jagdish; Bunyan, Milind; Mehta, Vishal K.; Jain, Niren; Karanth, Krithi K.

doi:10.1016/j.foreco.2005.12.018

Cited by 36 publications

(25 citation statements)

References 23 publications

(21 reference statements)

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“…Banas et al 2008;Gomi et al 2010) or extractive operations (e.g. Krishnaswamy et al 2006) tend to generate a 'ramp'-shaped pattern similar to that used in our experiment. Current environmental management is heavily reliant on the deWnition of ecological thresholds to establish a point beyond which ecosystem deterioration occurs (GroVman et al 2006).…”

Section: Discussionmentioning

confidence: 52%

“…1). Ramped pulses are common in sediment disturbances resulting from anthropogenic activities, such as eZuent discharge and extractive operations (Krishnaswamy et al 2006;Banas et al 2008;Gomi et al 2010). Both regimes were applied over 5 days and had otherwise constant frequency (1 perturbation every 21 h) and comprised disturbances of the same mean intensity (12 kg soil h ¡1 ) and duration (3 h) (Fig.…”

Section: Experimental Designmentioning

confidence: 99%

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Temporal variability within disturbance events regulates their effects on natural communities

Molinos

Donohue

2011

Oecologia

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Disturbances are processes inherently variable in time and space. This variability comprises a key determinant of ecosystem responses to disturbance. Temporal patterns can, however, vary significantly both among and within individual disturbance events. While recent research has demonstrated an importance of the former, studies on the effects of variability within perturbations have consistently confounded temporal variability with other disturbance attributes (e.g. overall intensity or duration). We established a field experiment to test explicitly the hypothesis that the temporal pattern within perturbations can drive ecosystem responses independently of other disturbance traits. We examined the effects of two disturbance regimes comprising sediment pulses of contrasting temporal pattern (constant and temporally variable intensities) on the benthic invertebrate assemblage of a headwater stream. The overall intensity, duration, timing and frequency of the perturbations were, however, identical. Invertebrates drifting during the temporally variable pulses were more abundant and differed in taxonomic and trophic structure than those exposed to constant perturbations. Moreover, whereas temporal patterns of disturbance events had no immediate effect on benthic invertebrate assemblages in situ, assemblages exposed to the constant perturbations took longer to recover from sediment disturbances than those exposed to temporally variable perturbations. Our results demonstrate that variability in the temporal pattern of intensity within individual perturbations can regulate, independently of other disturbance attributes, the extent and type of ecosystem responses to, and recovery from, disturbances. Effective environmental management and policy therefore necessitate the explicit quantification of temporal patterns of intensity both within and among perturbations.

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Section: Discussionmentioning

confidence: 52%

Section: Experimental Designmentioning

confidence: 99%

Temporal variability within disturbance events regulates their effects on natural communities

Molinos

Donohue

2011

Oecologia

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“…These impacts include land degradation, damage to water quality, pollution, and harm to livestock and wildlife biodiversity. Krishnaswamy et al [6] compared historic data with recent data and found out that mining and associated activities in Kudremukh National Park are the greatest sources of sediment entering the Bhadra River, which now carries considerably more sediment than before the mining activity started damaging the river ecosystem and disrupting downstream water resources. Khatua and Stanley [7] studied the lifestyle and livelihoods of affected communities, land use patterns, impact on natural resources, and climate change in the context of mining.…”

Section: Review Of Literaturementioning

confidence: 99%

Socio-Economic Impact of Industrialisation and Mining on the Local Population: A Case Study of Nalco Industrial Area, Koraput

Behera¹

2015

Int J Econ Manag Sci

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“…Among these, soil erosion is probably the most pervasive, as it strikingly increases sediment load in the streams located downstream from the gold mines. It is indeed recognized that mining-related stream sediment levels largely exceed those generated by other land-use changes, such as deforestation, agricultural intensification, road-building, or urbanization (Bruijnzeel 1993;Krishnaswamy et al 2006). This tendency is triggered in the Guiana shield where the rivers are characterized by some of the lowest levels of natural suspended sediment loads of the world (Hammond et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Small-scale gold mining erodes fish assemblage structure in small neotropical streams

et al. 2011

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The current gold rush experienced by the Guiana shield is profoundly disturbing freshwater ecosystems. Indeed, streams act as receptors for the water that drains gold mining sites and that contain a high load of sediment and toxicants. We here investigated how gold mining activities affect the structure of fish assemblages in small forest streams in French Guiana. We selected six streams subjected to different types of gold mining impact (reference, former gold mining and currently exploited sites) to measure the impact of gold mining on downstream fish assemblages, but also to determine the resilience of fish assemblages after stopping mining activities. Although overall descriptors of the assemblage such as species richness and fish biomass were not sensitive to gold mining, the fish taxonomic composition was strongly influenced. Furthermore, we showed that the functional structure of fish assemblages was significantly affected by the mining activities favouring smaller and ubiquitous fish at the expense of bigger and habitat specialist species. Even in areas where mining activities had stopped for some time, site resilience was incomplete.

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Impact of iron ore mining on suspended sediment response in a tropical catchment in Kudremukh, Western Ghats, India

Cited by 36 publications

References 23 publications

Temporal variability within disturbance events regulates their effects on natural communities

Temporal variability within disturbance events regulates their effects on natural communities

Socio-Economic Impact of Industrialisation and Mining on the Local Population: A Case Study of Nalco Industrial Area, Koraput

Small-scale gold mining erodes fish assemblage structure in small neotropical streams

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