نتایج جستجو برای: aquatic organisms
تعداد نتایج: 119613 فیلتر نتایج به سال:
Paleolimnologists have utilized lake sediment records to understand historical lake and landscape development, timing and magnitude of environmental change at lake, watershed, regional and global scales, and as historical datasets to target watershed and lake management. Resurrection ecologists have long recognized lake sediments as sources of viable propagules ("seed or egg banks") with which ...
Long life expectancy of populations in the developing world together with some cultural and social issues has driven need to pay special attention health physical appearance. Cosmeceuticals are gaining interest cosmetic industry as their uses fulfills a double purpose: requirements (clean, perfume, protect, change appearance external parts body or keeping them good condition) particular bioacti...
Spatial patterns in mercury cycling and bioaccumulation at the landscape level in the Everglades were investigated by collecting and analyzing multimedia samples for mercury species and biogeochemical characteristics from 228 randomly located stations. Higher total mercury (THg) in environmental compartments (surface water, soil, flocculent detrital material (floc), and periphyton) generally oc...
Transition metals are essential for health, forming integral components of proteins involved in all aspects of biological function. However, in excess these metals are potentially toxic, and to maintain metal homeostasis organisms must tightly coordinate metal acquisition and excretion. The diet is the main source for essential metals, but in aquatic organisms an alternative uptake route is ava...
Monitoring programs designed to assess changes in population size over time need to account for imperfect detection and provide estimates of precision around annual abundance estimates. Especially for species dependent on conservation management, robust monitoring is essential to evaluate the effectiveness of management. Many bird species of temperate grasslands depend on specific conservation ...
Understanding the drivers and implications of anthropogenic disturbance of ecological connectivity is a key concern for the conservation of biodiversity and ecosystem processes. Here, we review human activities that affect the movements and dispersal of aquatic organisms, including damming of rivers, river regulation, habitat loss and alteration, human-assisted dispersal of organisms and climat...
Stream ecosystems are especially vulnerable to climate warming because most aquatic organisms are ectothermic and live in dendritic networks that are easily fragmented. Many bioclimatic models predict significant range contractions in stream biotas, but subsequent biological assessments have rarely been done to determine the accuracy of these predictions. Assessments are difficult because model...
Fall 2006 Meeting, joint with the Acoustical Society of Japan (Honolulu, Hawaii). The Technical Committee on Acoustical Oceanography AO sponsored two special sessions: 1 “Acoustic scattering by aquatic organisms,” organized by Ken Foote Woods Hole Oceanographic Institution and Masahiro Furusawa from the Acoustical Society of Japan; and 2 “Ocean acoustic tomography for coastal and deep water app...
Biodiversity and nature values in anthropogenic landscapes often depend on land use practices and management. Evaluations of the association between management and biodiversity remain, however, comparatively scarce, especially in aquatic systems. Furthermore, studies also tend to focus on a limited set of organism groups at the local scale, whereas a multi-group approach at the landscape scale ...
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