Heavy metals in the main streams of the James River Basin, Missouri

Demands on water resources in the James River basin have greatly increased. Industrial plants and lead-zinc prospects in the basin are potential sources of heavy metal additions to the waters of the area. The study determines the heavy metal content and distribution in the streams of the basin. Approximately 50 water samples were collected each season and analyzed by atomic absorption techniques. Field determinations of temperature, specific conductance, pH, and effective alkalinity were also made. Ranges of heavy metal content were: (1) mercury- \u3c0. 1 to 0.3 ppb (summer only); (2) zinc- The urban areas of Springfield contribute dissolved heavy metals to the surface streams. The Southwest Springfield Sewage Treatment Plant is not a significant source. Seasonal and geographic variations were apparent. Gee-hydrologic contributions appear to be related to mineralized and faulted areas. Variation at individual sample sites is not considered of great significance. Filtered water samples meet PHS heavy metal standards for public drinking water --Abstract, page 1

Oligarchy reloaded and pirate media: the state of peace journalism in Guatemala

Oligarchy reloaded and pirate media: the state of peace journalism in Guatemal

On the importance of being finished

The publication of an increasing number of draft genome sequences presents problems that will only be resolved by improved search tools and by complete finishing of the sequences - and their deposition in publicly accessible databases

Bycatch and Bycatch Reduction in Recreational Shrimping

We estimated the bycatch from recreational shrimping by quantifying the catch from fishery independent trawling and through a survey of licensed recreational shrimpers in Alabama during 1990. We used paired trawls to test two net modifications (fish shooter and Florida flsheye) for bycatch reduction. The mean fish bycatch was 5.4 kilograms per 20 minutes tow and contained 426 fish primarily from three families (Sciaenidae, Engraulidae, and Clupeidae). The total recreational shrimping effort for Alabama was an estimated 37,244 h resulting in a potential fish bycatch of 603,000 kg or 47.8 million fish. The fish shooter did not significantly reduce the bycatch in either weight or numbers while the Florida flsheye significantly reduced bycatch in both weight (28 percent) and number (48 percent). Further testing of the Florida fisheye with the position of the nets reversed revealed no significant reduction in weight but a significant reduction in bycatch number (38 percent)

Heavy metals in the main streams of the James River Basin, Missouri

Demand for water in the James River basin has greatly increased. Larger numbers of industrial plants and the presence of lead-zinc prospects in the basin are potential sources of heavy metal additions to the waters of the area. This study determines selected heavy metal content and distribution in the streams of the basin and establishes some heavy metal bench mark values for this time period. Approximately 50 water samples were collected in each of three seasons. These samples were analyzed by atomic absorption techniques. Temperature, specific conductance, pH, and effective alkalinity were made in the field. Ranges of heavy metal content were: (1) mercury - [less than] 0.1 to 0.3 ppb (summer only); (2) zinc - [less than] 1 to 80 ppb; (3) copper - [less than] 1 to 18 ppb; (4) lead - [less than] 1 to 41 ppb; (5) cadmium- [less than] 1 to 7 ppb; and (6) iron [less than] 50 to 277 ppb. The urban areas of Springfield contribute dissolved heavy metals to the surface streams. The Southwest Springfield Sewage Treatment Plant is not a significant source. Seasonal and geographic variations are also apparent. Heavy metal contributions appear to be related to mineralized and faulted areas in the basin. Variation of heavy metals at individual sample sites is not considered of great significance. Filtered water samples meet PHS heavy metal standards for public drinking water.Project # A-066-MO Agreement # 14-31-0001-382

Special issue - Beyond clickbait and commerce: The ethics, possibilities and challenges of not-for-profit media

This special issue of Ethical Space explores the ethical dilemmas arising in the turbulent journalistic environment created by digital transformation and its impact on the traditional media business model

Implications of Natural Variation of Fish Assemblages to Coral Reef Management

In order to evaluate the impact of a planned beach renourishment project we obtained baseline data on hardbottom coral reef fish assemblages adjacent to the beach. During the summers of 2001 and 2003 we conducted 92 and 89 visual transect-counts, respectively, each 30x2x1m. Fish were recorded by species, abundance, and size class. Fish exhibited a 62.8% decrease in abundance between the 2001 and 2003 surveys. Juvenile Haemulon spp. (\u3c5cm total length, TL) alone decreased 72.8% in abundance and, due to their predominance, primarily drove the decrease seen for total abundance. The second most abundant species Halichoeres bivittatus, also primarily juveniles (\u3c5cm TL), contributed 8% of the total abundance and also showed a significant decrease between the 2001 and 2003 surveys. Even after removal of the two most abundant taxa, total abundance remained significantly lower the second survey year, suggesting the possibility of a community-wide decrease in abundance. However, the decrease between years was mainly due to a decrease in juveniles. When fish less than 5cm TL were removed from the dataset, no significant difference in abundance between years was detected. Species richness also declined significantly with fewer species noted in 2003 and eight fewer total species between years. Nonetheless, multivariate examination of assemblage structure did not indicate a difference between years. These results have important implications for determining potential anthropogenic change in fish assemblages (e.g. caused by beach renourishment)