This study was performed to elucidate the distribution, concentration trend and possible sources of total mercury (HgT) and methylmercury (MeHg) in sediment cores (

Antimicrobials used in salmon aquaculture pass into the marine environment. This could have negative impacts on marine environmental biodiversity, and on terrestrial animal and human health as a result of selection for bacteria containing antimicrobial resistance genes. We therefore measured the numbers of culturable bacteria and antimicrobial-resistant bacteria in marine sediments in the Calbuco Archipelago, Chile, over 12-month period at a salmon aquaculture site approximately 20 m from a salmon farm and at a control site 8 km distant without observable aquaculture activities.

Flow of the river is its master variable which affects many other variables like water quality, sedimentation, biodiversity,
etc. Dams profoundly affect this natural flow. Unfortunately, in India there are very few studies which systematically
analyse impacts of a dam on a river and its biodiversity in the pre and post dam situation. This is especially true for dams
built in 1960s, 70s and 80s. We have limited database and nearly no biodiversity studies of river richness prior to and after