Ein Optimalprinzip in der Theorie aquatischer Okosysteme. (An optimun principle in the theory of aquatic ecosystems)
In the thermodynamic theory of aquatic ecosystems the non-linear relations between rates and affinities of biological processes, such as primary production, respiration, grazing etc. can be determined using an optimun principle. Especially
Microbial accumulation of iron and manganese in different aquatic environments: an electron optical study
This article presents a series of electron optical observations dealing with the mineralization of Fe and Mn by microorganisms in aquatic systems associated with mine-waste systems and in terrestrial hot springs in Yellowstone National Park.
Etude analytique de la contamination d'invertébrés aquatiques par le lindane dans une rivière de Hesbaye. (Analytical study of the contaminsation of aquatic invertebrates by lindane in a river of Hesbaye)
Protecting aquatic ecosystems in heavily allocated river systems : the case of the Oldman River Basin, Alberta
Alberta ; Aquatic ecosystem ; Canada ; Cultural policy ; Environmental conservation ; Irrigation ; Political ecology ; River basin ; Water ; Water management
, forms an obstacle to longshore eolian and aquatic sediment movement. There is a clear mutual interaction between the choking of the channel and the nearby beach dynamics. The research highlights the importance of net longshore sediment transport, both
eolian and aquatic, in this part of the Belgian coast. It shows that important quantities of sand are moved in relatively short periods of time.
Quelques aspects des interactions entre litières forestières et écosystèmes aquatiques ou terrestres. (Some aspects of the interactions between forest litters and aquatic or terrestrial ecosystems)
that are relevant for biophysical geographers interested in using subfossil chironomids to reconstruct past environmental and aquatic ecosystem conditions. They will also touch on the classic use of modern chironomid collections for phylogenetic research
Aquatic ecosystem ; Ecology ; Habitat ; Landscape esthetics ; Nature conservation ; Stream ; United States of America
AA. deconstruct the claim that a river restored to its natural state is a public good. Organized public cleanups such as those sponsored by America Outdoors can disrupt aquatic habitat. Discussed are five responses from river cleanup organizations
Formen, Formengesellschaften und Untergrenzen in den heutigen periglazialen Hohenstufen der Hochgebirge Europas und Afrikas zwischen Arktis und Aquator. Bericht über ein Symposium. (Formes, associations de formes et limites inférieures de l'étage
A survey of distribution and amount of persistent organochlorine toxins in the Belgian environment emphasized that the aquatic ecosystems are particularly contaminated by PCB.
This paper helps us to understand the fact that the oxygen status of water, measured in terms of either level of dissolved oxygen or bio-chemical oxygen demand is perhaps the best indicator of health of an aquatic ecosystem. - (PLK)
An extensive sampling survey of animals and aquatic and ripicolous plants was performed in September 1974 in the Upper Meuse, in order to determine the mean levels of radioactive contamination of the main constituents of the river ecosystem
. In particular, the aquatic mosses remain the most suitable indicators for routine surveillance of the evolution of radioactive contamination in such ecosystems. (LW).
tracers to Si biogeochemistry. Multiproxy investigations of lake sediments will provide novel insights into past variations in Si biocycling from terrestrial to aquatic on 10-10 000 000 year time-scales.
Analyses of pollen, plant macrofossils, macroscopic charcoal, mollusks, magnetic susceptibility, and geochemical content of a sediment core from Farewell Lake yield a 11,000-yr record of terrestrial and aquatic ecosystem changes in the northwestern
foothills of the Alaska Range. This mutiproxy record provides insights into the responses of terrestrial and aquatic ecosystems to climatic changes.