Results 161 to 170 of about 19,982,393 (193)
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Lentic, lotic, and sulfate-dependent waterborne selenium screening guidelines for freshwater systems
Environmental Toxicology and Chemistry, 2017Abstract There is consensus that fish are the most sensitive aquatic organisms to selenium (Se) and that Se concentrations in fish tissue are the most reliable indicators of potential toxicity. Differences in Se speciation, biological productivity, Se concentration, and parameters that affect Se ...
David K, DeForest +8 more
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Aufwuchs communities of lotic systems: nontaxonomic structure and function
2017Ph. D.
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Empirical Models Predicting Population Abundance and Productivity in Lotic Systems
Journal of the North American Benthological Society, 1997Stream ecologists have yet to produce general predictive models of abundance and productivity of lotic organisms. The large number of factors affecting species abundance, differences in fauna and flora among ecoregions, and the cost of calibrating models combine to put in question our hope of producing general mechanistic models that yield quantitative
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Ecohydrology of Lotic Systems in Uttara Kannada, Central Western Ghats, India
Springer Earth System Sciences, 2015The Western Ghats is the primary catchment for most of the rivers in peninsular India. Pristine forests in this region are rich in biodiversity but are under environmental stress due to unplanned developmental activities. This has given rise to concerns about land use/land cover changes with the realization that the land processes influence the climate.
Ramachandra T V +2 more
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Using Diatoms as Indicators of Ecological Conditions in Lotic Systems: A Regional Assessment
Journal of the North American Benthological Society, 1996Benthic diatoms and water chemistry were sampled from 49 stream sites in the Mid- Atlantic Highlands region of the United States to evaluate the use of diatoms as indicators of envi- ronmental conditions in streams across varying geographic and ecoregional areas.
Yangdong Pan +4 more
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The dynamics and retention of phosphorus in lentic and lotic patches of two river—lake systems
Hydrobiologia, 1993Two river-lake systems in a mosaic, lowland postglacial landscape (Masurian and Suwalskie Lakelands, northeastern Poland) of different length and flow were studied. The concentration of total and dissolved phosphorus (in water and in seston) and the retention of these two forms of P were analysed at several hydrological occasions in lakes of various ...
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Using dragonflies to monitor and prioritize lotic systems: a South African perspective
Organisms Diversity & Evolution, 2012The ever-worsening condition of streams due to local, regional, and global demands on water has resulted in the development of increasingly streamlined, rapid assessment methods using macroinvertebrates. Biotic indices in particular are versatile and robust, although not always easy to use.
John P. Simaika, Michael J. Samways
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Benthos of the lotic environments in the middle Paraná River system: transverse zonation
Hydrobiologia, 1992This study synthesizes the results from ten years (1978–1988) of research in lotic environments of the middle Parana River. We elucidate the important environmental factors that determine differences in quality and structure of the benthos among the main channel, secondary channels and tributaries, and we determine species or descriptive associations ...
M. Marchese, I. Ezcurra de Drago
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Acid mine drainage composition and the implications for its impact on lotic systems
Water Research, 1998Abstract Intensive sampling of acid mine drainage from adits draining the abandoned copper and sulphur mines at Avoca, south-east Ireland, has confirmed a seasonal variation in the Zn:Cu ratio observed previously. The variation in the Zn:Cu ratio leads to extreme variations in the toxicity of the drainage, and linked with increased adit flows and ...
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Bacteria biofilm encourages algal immigration onto substrata in lotic systems
Hydrobiologia, 2005I tested the effect of the density of attached bacteria on the amount of algal immigration in the early development of a periphyton community in an artificial stream by manipulating the density of the attached bacteria. Three densities were prepared by regulation of the incubation time.
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