Selenium concentrations in eggs of American avocets and black-necked stilts at an evaporation basin and freshwater wetland in California

Article Abstract:

Avian reproduction has been shown to be impaired by high selenium concentrations in agricultural tile-drainage basins in the San Joaquin Valley, CA. The operators of such basins are required to provide a freshwater habitat to lessen the effect of selenium toxicity. A new study examines whether the adjacent freshwater wetland dilutes the selenium exposure of recurvirostrids which nest at the evaporation basin by examining eggs of avocets and stilts. The study shows that the availability of fresh water provides an opportunity for avocets to dilute their selenium intake but no reduction in selenium intake was detected in stilts.

Natural history, Birds, Bird eggs, Bird nests, Selenium, Selenium (Chemical element), Water birds, San Joaquin Valley

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Wetland availability and use by breeding waterfowl in Southern Ontario

Article Abstract:

A study has been conducted to describe breeding waterfowl use of habitat in the Prairie Pothole Region by surveying 15 wetland habitats in southern Ontario, Canada. Open water lakes and beaver ponds accounted for, 47% and 25% respectively, of the available habitats in the region, while bogs and seasonal basins and deciduous swamps accounted for 11% and 50%, respectively, of wetlands occupied by breeding waterfowl. Mallard, wood duck and the blue-winged teal dominated the common breeding areas such as beaver ponds as compared to open water lakes.

Ontario, Waterfowl, Poultry breeding

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Home range and habitat selection of bog turtles in southwestern Virginia

Article Abstract:

Bog turtles have been affected by habitat loss and trade in turtles as pets. There is not enough knowledge about the habitat requirements of these turtles. A study has used radio telemetry to assess the size of the home ranges of the turtles in southwestern Virginia. The size of home ranges and habitat selection were not affected by the sex of the turtles. Turtles were found in deep mud and shallow water, and also showed a preference for bulrush, smooth alder edge and wet meadows. Home ranges tend to be small.

Wildlife management, Turtles

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