Journal of Aquatic Ecosystem Health
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Sắp xếp:
Recovery in complex ecosystems
Journal of Aquatic Ecosystem Health - Tập 6 - Trang 181-187 - 1998
Current ecosystem theory has a deceptively simple representation of recovery. In
actual practice,recovery is affected by the frequency and extent of disturbances
and by the spatial heterogeneity of the ecological system. Environmental changes
may pass through thresholds causing recovery to a different plant and animal
community. The sheer complexity of the system combined with unanticipated
synerg...
Acid rain — perspectives on lake recovery
Journal of Aquatic Ecosystem Health - Tập 6 - Trang 207-216 - 1998
During the 1970‘s and 1980‘s, the acidification of surface waters by
atmospherically deposited sulphur became a major international concern. Large
sulphur emission control programs were implemented in Europe and North America
with the expectation that many affected aquatic ecosystems would recover.
Because of a variety of factors, these positive expectations have been slow to
be realized. Only lim...
The role of nitrogen-phosphorus ratio in selecting for dominance of phytoplankton by cyanobacteria or green algae and its application to reservoir management
Journal of Aquatic Ecosystem Health - Tập 5 - Trang 55-61 - 1996
The undesirable consequences of phosphorus enrichment in reservoirs are
primarily connected with the emerging abundance of cyanobacteria which are not
utilized by the consumers and form, as a rule, a trophic block in the majority
of nutrition chains. Blooming ofChlorococcales does not produce these negative
effects since they are actively consumed by grazers. The NT ratio turns out to
be the facto...
Integrating effects of contaminants across levels of biological organization: an overview
Journal of Aquatic Ecosystem Health - Tập 7 - Trang 113-116 - 2000
Effects of contaminants may occur at all levels oforganization, from molecular
to ecosystem-levelresponses. While biochemical and physiologicalalterations in
organisms may occur rapidly and areoften stressor-specific, the ecological
relevance ofthese suborganismal indicators is uncertain.Alterations in
populations and communities havegreater ecological relevance, but a firm
mechanisticunderstandin...
Towards an ecological assessment of watercourses
Journal of Aquatic Ecosystem Health - Tập 2 - Trang 29-38 - 1993
Due to a fast decline in the ecological quality of watercourses combined with
the threat of human functions, policy makers started to legislate water quality
objectives for watercourses and to set up water purification programs. The
description of universal quality objectives is too limited as a frame of
reference and a policy only based on water quality cannot guarantee the goals of
river restora...
Structure and Taxonomic Status of Trichogloea Herveyi
Journal of Aquatic Ecosystem Health - Tập 3 - Trang 113-121 - 1951
Using integrated state-of-environment reporting as a planning tool for resource management
Journal of Aquatic Ecosystem Health - - 1993
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