نتایج جستجو برای: hydrobiology
تعداد نتایج: 175 فیلتر نتایج به سال:
Watersheds represent spatially explicit areas within which terrestrial stressors can be quantified and linked to measures of aquatic ecosystem condition. We delineated thousands of Great Lakes watersheds using previously proven and new watershed delineation techniques. These were used to provide summaries for a variety of anthropogenic stressors within the Great Lakes. All delineation technique...
Purpose. To investigate the peculiarities of growth age-1+ paddlefish depending on water temperature and quantitative parameters zooplankton development in ponds forest-steppe zone Ukraine. Methodology. Age-1+ paddlefish, a North American zooplanktophagus were reared polyculture with cyprinids 72-hectare pond using semi-intensive technology. The stocking density age-1 an average weight 86.5 g w...
Daphnia hyalina was used to assess the impact of zooplankton on the photosynthetic activity of picocyanobacteria. A phosphorus-limited laboratory system was designed, composed of 3m filtered lake water with natural assemblages to which non-axenic Synechococcus sp. was added. Different treatments with and without Daphnia were arranged; aliquots from these were sampled during 3-day incubations to...
As a result of flora-systematic studies the Akdarya reservoir, 71 species and varieties (63 species, 16 variations, 1 form) were identified, which belong to 4 departments, 10 orders, 14 families, 24 genera. The composition is dominated by diatoms (Bacillariophyta), consisting 56 varieties, followed detached green (Cyanophyta) - 9 (8 form), yellowish (Xanthophyta) 4, (Chlorophyta) 2 algae. Hormo...
This paper overviews several examples of important public health impacts by marine microbes and directs readers to the extensive literature germane to these maladies. These examples include three types of dinoflagellates (Gambierdiscus spp., Karenia brevis, and Alexandrium fundyense), BMAA-producing cyanobacteria, and infectious microbes. The dinoflagellates are responsible for ciguatera fish p...
The Clinch River of southwestern Virginia and northeastern Tennessee is arguably the most important river for freshwater mussel conservation in the United States. This featured collection presents investigations of mussel population status and habitat quality in the Clinch River. Analyses of historic waterand sediment-quality data suggest that water column ammonia and water column and sediment ...
Intermittent headwater streams serve important functions for humans and wildlife in semi-arid rangelands. Increases in ashe juniper coverage in central Texas over recent decades are believed to have negatively impacted stream flows. Few studies have examined relationships between aquatic species and environmental factors in these systems as well as the influence of juniper coverage on assemblag...
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