Results 211 to 220 of about 119,816 (255)
Some of the next articles are maybe not open access.
Algae as ecological indicators
Food and Chemical Toxicology, 1986Algae as ecological indicators , Algae as ecological indicators , مرکز فناوری اطلاعات و اطلاع رسانی ...
J. W. Eaton, L. Elliot Shubert
+6 more sources
Ecological vulnerability indicators
Ecological Indicators, 2016 Abstract Indicators provide easy and quick information on the status or condition of an object of interest and are therefore widely used in policy-making. In recent years, policy interest in vulnerability research has increased and a growing number of studies have been aimed at developing vulnerability indicators. Some of these studies have been done
exaly +2 more sources
Biodiversity in the Age of Ecological Indicators
Acta Biotheoretica, 2006The multifarious nature of biodiversity is considered in relation to difficulties of definite determination and managerial mandates for monitoring. At a micro scale there is some convergence with the concept of community, but the linkage is largely lost in the spectra of temporal scope, spatial scales, successional seres, and taxonomic trajectories ...
Wayne, Myers, G P, Patil
openaire +2 more sources
2017
This chapter explains the concepts behind ecological indicators. Some ecological indicator systems are based on the abundance of a single species. It is said that environmental indicators are founded on the principle of ecological niches and tolerance range.
Anne E. Goodenough, Adam G. Hart
openaire +1 more source
This chapter explains the concepts behind ecological indicators. Some ecological indicator systems are based on the abundance of a single species. It is said that environmental indicators are founded on the principle of ecological niches and tolerance range.
Anne E. Goodenough, Adam G. Hart
openaire +1 more source
Ecological Indicators and Ecological Modelling
1992The most important components of ecosystems are the biological components, and a full environmental impact assessment of ecosystems will therefore require that these components are seriously considered. It is, for instance, not sufficient to assess the water quality by use of physicochemical parameters, although their determination can be carried out ...
openaire +1 more source
Sterols as ecological indicators
Geochimica et Cosmochimica Acta, 1979Abstract Plots of the C-27, C-28 and C-29 sterol contents of marine plankton, higher plants, soils, and lacustrine and marine sediments form discrete areas in a triangular diagram. Because the positions of these plots of the various samples are relatable to biological sources, sterol analyses may be used to define ecological systems.
Wen-Yen Huang, W.G. Meinschein
openaire +1 more source
Indicators of Ecological Integrity
2018Freshwater Ecological Integrity (EI) incorporates the concepts of ecosystem “health”, unimpaired structure, composition and function and a capacity for self-renewal and, as such, it is a holistic advance over standard water quality metrics for assessing lake condition.
Marc Schallenberg +2 more
openaire +1 more source
Ecological indicators - Entropy
2008This article presents a scientific overview of ‘entropy’ as a thermodynamic basic function. A primary definition of entropy is stated in classical thermodynamics and statistical mechanics. The second law of thermodynamics states that, in any physical or chemical process, the quality of the energy in a system degrades, thus proving the existence of ...
MARCHETTINI, N. +3 more
openaire +5 more sources
American Midland Naturalist, 1946
Fossil algae, somewhat neglected in the past because of difficulties of identification, have come in for an increasing amount of attention during recent years. If identifiable, they can add their bit of evidence to the general habitat, or paleoecological picture.
openaire +1 more source
Fossil algae, somewhat neglected in the past because of difficulties of identification, have come in for an increasing amount of attention during recent years. If identifiable, they can add their bit of evidence to the general habitat, or paleoecological picture.
openaire +1 more source
Ecological Indicators for Ecological Engineering in Wetlands
1992While the extent of wetlands in presettlement United States is difficult to determine, the wetlands in the coterminous United States are estimated to have decreased from approximately 60 to 75 million hectares then to about 42 million hectares today (OTA, 1984; Mitsch and Gosselink, 1986). In Midwestern states such as Ohio and Illinois, over 90 percent
openaire +1 more source