Cung cấp xem xét lại này Tổng quan về vai trò, các tuyến đường và ảnh hưởng của mangan trong động vật giáp xác thuỷ sản. Mangan là một kim loại trầm tích tự nhiên dồi dào trong biển và nước ngọt ở đâu Nó là Tham gia vào một số lượng lớn của các quá trình hóa học. Mặc dù phần trầm tích tự nhiên nồng độ cao của mangan, mối đe dọa tiềm năng để sinh vật sống ở đáy đã-được thờ ơ trong các nghiên cứu cho đến nay. . | Oceanography and Marine Biology An Annual Review 2006 44 61-83 R. N. Gibson R. J. A. Atkinson and J. D. M. Gordon Editors Taylor Francis ROLE ROUTES AND EFFECTS OF MANGANESE IN CRUSTACEANS SUSANNE P BADEN SUSANNE P ERIKSSON Goteborg University Department of Marine Ecology Kristineberg Marine Research Station S-450 34 Fiskebackskil Sweden E-mail Abstract This review provides an overview of the role routes and effects of manganese in aquatic crustaceans. Manganese is a naturally abundant metal in marine and freshwater sediments where it is involved in a large number of chemical processes. Although sediments contain high natural concentrations of manganese the potential danger to benthic organisms has been neglected in studies to date. Manganese bioavailability increases as the result of human impact and it accumulates in biota. Manganese may occur in toxic concentrations 10-20 mg l-1 in the bottom water of marine coastal areas after hypoxia or more locally . close to industries as well as in acidic lakes and aquaculture shrimp ponds. Though manganese is an essential metal it is also an unforeseen toxic metal in the aquatic environment. Although the uptake and elimination of manganese is rapid manganese affects processes that decrease the fitness of organisms. As manganese bioavailability increases its uptake is predominately through the water. The midgut gland nerve tissue blood proteins and parts of the reproductive organs have the highest accumulation factors and are the main target tissues. The functional effects of manganese in aquatic environments are still sparsely investigated. Recent results show that the immune system the perception of food via chemosensory organs and a normal muscle extension are affected at manganese concentrations observed in the field. Geochemical role of manganese Manganese is the 12th most common element the fourth most abundant metal and is universally distributed in the earth s crust and waters Anonymous 2005 . .
