Scale-dependent effects of spatial and temporal variability on benthic macroinvertebrate communities in Hong Kong streams

2002 ◽  
Author(s):  
Sze-lun Leung
Keyword(s):  
Hong Kong ◽  
Temporal Variability ◽  
Benthic Macroinvertebrate ◽  
Spatial And Temporal Variability ◽  
Macroinvertebrate Communities

Spatial and temporal variability of diatom and macroinvertebrate communities: How representative are ecological classifications within a river system?

2012 ◽  
Vol 18 ◽  
pp. 208-217 ◽  
Author(s):  
Heikki Mykrä ◽  
Tuomas Saarinen ◽  
Mikko Tolkkinen ◽  
Ben McFarland ◽  
Heikki Hämäläinen ◽  
...  
Keyword(s):  
Temporal Variability ◽  
River System ◽  
Spatial And Temporal Variability ◽  
Macroinvertebrate Communities

scholarly journals Suggested Sampling Methodology for Lake Benthic Macroinvertebrates under the Requirements of the European Water Framework Directive

Water ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1353
Author(s):  
Chrysoula Ntislidou ◽  
Dimitra Bobori ◽  
Maria Lazaridou
Keyword(s):  
Benthic Macroinvertebrates ◽  
Temporal Variability ◽  
Sampling Design ◽  
Benthic Macroinvertebrate ◽  
Spatial And Temporal Variability ◽  
Sampling Effort ◽  
Taxa Richness ◽  
Natural Lakes ◽  
European Water ◽  
Precision Level

The estimation of the number of samples required for reliably monitoring lakes’ benthic macroinvertebrates is difficult due to the natural variability and cost and time constraints. To determine a statistically robust and effective sampling design, we collected benthic macroinvertebrate samples from 15 Greek natural lakes. We compared the spatial and temporal variability of the benthic macroinvertebrate community composition to identify differences among lakes, between lake zones (sublittoral and profundal) and sampling periods. Furthermore, we examined the sampling precision and determined the number of required samples to attain maximum taxa richness. The diminution of the sampling effort was estimated and the desired precision level, considering different benthic macroinvertebrate abundances, was modelled. No temporal or spatial variation between lake zones was observed in communities’ compositions. The precision of our sampling design was adequate, and rarefaction curves revealed an adequate taxa richness (>70%). The developed model could be applied to assess the required sampling effort in lakes within the Mediterranean ecoregion with similar benthic macroinvertebrate abundances.

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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