scholarly journals Spatio-Temporal Variability in Benthic Macroinvertebrate Communities in Headwater Streams in South Korea

Water ◽  
2016 ◽  
Vol 8 (3) ◽  
pp. 99 ◽  
Author(s):  
Mi-Jung Bae ◽  
Jung Chun ◽  
Tae-Soo Chon ◽  
Young-Seuk Park
Keyword(s):  
South Korea ◽  
Temporal Variability ◽  
Headwater Streams ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Spatio Temporal

scholarly journals Responses of stream benthic macroinvertebrate communities to timber harvesting: Best management practices in a low-gradient watershed in Central Louisiana, USA

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
Derrick Klimesh ◽  
Adrienne V. Gossman ◽  
Y. Jun Xu ◽  
Michael D. Kaller
Keyword(s):  
Community Structure ◽  
Best Management Practices ◽  
Management Practices ◽  
Headwater Streams ◽  
Stream Water ◽  
Timber Harvest ◽  
Timber Harvesting ◽  
Benthic Macroinvertebrate ◽  
Macroinvertebrate Communities ◽  
Best Management

AbstractForests are the most dominant land-use type in Louisiana, and timber harvesting is the most economically important of the state’s agricultural commodities. Louisiana has developed voluntary best management practices (BMPs) to minimize negative effects of forest operations on stream water quality, but little is known about how aquatic communities inhabiting low-gradient, headwater streams respond to timber harvesting, and if the current BMPs are effective in protecting community structure and function. In 2005, we initiated a multidisciplinary study in the Flat Creek watershed in central Louisiana to discern the effects of timber harvesting activities, with and without BMP implementation, on benthic aquatic macroinvertebrates. During fall 2007, trees were removed adjacent to two headwater streams in the watershed, and benthic macroinvertebrate samples were subsequently collected at seven stream locations seven times between 2006 and 2009. Our objectives were to describe the community structure of benthic macroinvertebrates in low-order, low-gradient streams, how macroinvertebrate communities responded to timber harvest operations, and whether significant changes in community structure were evident under different levels of BMP implementation. The community structure was predominantly generalist taxa including chironomids, sphaeriid bivalves and asellid isopods. Analyses of variance demonstrated significant increases in bivalve abundance and decreases in the abundance of malacostracan and shredding taxa at most of the sampling sites downstream of BMP-implemented harvest locations in the spring. Additionally, significant increases in bivalves were also found at two sites during late summer. Our results suggest that timber harvesting activities, regardless of BMP implementation, had limited shortterm impacts on resident macroinvertebrates in these lowgradient, subtropical streams. Continued monitoring at the study sites will allow us to better understand the longterm effects of timber harvesting in these stream systems, particularly the resilience of stream biota to harvestingrelated stream conditions.

scholarly journals Shale gas development has limited effects on stream biology and geochemistry in a gradient-based, multiparameter study in Pennsylvania

2020 ◽  
Vol 117 (7) ◽  
pp. 3670-3677 ◽  
Author(s):  
Adam C. Mumford ◽  
Kelly O. Maloney ◽  
Denise M. Akob ◽  
Sarah Nettemann ◽  
Arianne Proctor ◽  
...  
Keyword(s):  
Shale Gas ◽  
Temporal Variability ◽  
Oil And Gas ◽  
Headwater Streams ◽  
Stream Water ◽  
The United States ◽  
Benthic Macroinvertebrate ◽  
Spatial And Temporal Variability ◽  
Stream Chemistry ◽  
Geochemical Tracers

The number of horizontally drilled shale oil and gas wells in the United States has increased from nearly 28,000 in 2007 to nearly 127,000 in 2017, and research has suggested the potential for the development of shale resources to affect nearby stream ecosystems. However, the ability to generalize current studies is limited by the small geographic scope as well as limited breadth and integration of measured chemical and biological indicators parameters. This study tested the hypothesis that a quantifiable, significant relationship exists between the density of oil and gas (OG) development, increasing stream water concentrations of known geochemical tracers of OG extraction, and the composition of benthic macroinvertebrate and microbial communities. Twenty-five headwater streams that drain lands across a gradient of shale gas development intensity were sampled. Our strategy included comprehensive measurements across multiple seasons of sampling to account for temporal variability of geochemical parameters, including known shale OG geochemical tracers, and microbial and benthic macroinvertebrate communities. No significant relationships were found between the intensity of OG development, shale OG geochemical tracers, or benthic macroinvertebrate or microbial community composition, whereas significant seasonal differences in stream chemistry were observed. These results highlight the importance of considering spatial and temporal variability in stream chemistry and biota and not only the presence of anthropogenic activities in a watershed. This comprehensive, integrated study of geochemical and biological variability of headwater streams in watersheds undergoing OG development provides a robust framework for examining the effects of energy development at a regional scale.

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