Search results
Results from the WOW.Com Content Network
Small sets of indicator species can also be used to predict species richness for multiple taxonomic groups. [8] The use of a biomonitor is described as biological monitoring and is the use of the properties of an organism to obtain information on certain aspects of the biosphere. Biomonitoring of air pollutants can be passive or active.
Penicillium species, Aspergillus niger and Candida albicans are used in the pharmaceutical industry for microbial limit testing, bioburden assessment, method validation, antimicrobial challenge tests, and quality control testing. [11] When used in this capacity, Penicillium and A. niger are compendial mold indicator organisms. [11]
When compiled, local indicators may be too diverse to provide a national result. Indicators also face other limitations and challenges, such as: Lack of reference levels, therefore it is unknown if trends in environmental change are strong or weak. Indicator measures can overlap, causing over estimation of single parameters.
The indicator value of Dufrêne and Legendre from 1997 is an integral part of the indicator value, which quantifies the fidelity and specificity of species in relation to groups of sites in a user-specified classification of sites, and tests for the statistical significance of the associations by permutation. [2] [7] [8]
Indicator, a genus of birds in the honeyguide family; Indicator species, a species that defines a characteristic of an environment; Indicator bacteria, bacteria used to detect and estimate the level of fecal contamination of water; Indicator organism, organisms used to measure such things as potential fecal contamination of environmental samples
Indicator bacteria can be cultured on media which are specifically formulated to allow the growth of the species of interest and inhibit growth of other organisms. Typically, environmental water samples are filtered through membranes with small pore sizes and then the membrane is placed onto a selective agar.
Black grouse, which are seen as an important indicator species for ecosystem health, have suffered UK-wide decline over recent decades due to threats such as habitat loss and intensive land ...
The smallest species by body mass appears to be the green-backed honeyguide, at an average of 10.2 g (0.36 oz), and by length appears to be the Cassin's honeyguide, at an average of 10 cm (3.9 in), while the largest species by weight is the lyre-tailed honeyguide, at 54.2 g (1.91 oz), and by length, is the greater honeyguide, at 19.5 cm (7.7 in).