indicator species


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indicator species

n.
A species whose abundance in a given area is believed to indicate certain environmental or ecological conditions or suitable conditions for a group of other species.

indicator species

A species whose presence, absence, or relative well-being in a given environment is a sign of the overall health of its ecosystem. By monitoring the condition and behavior of an indicator species, scientists can determine how changes in the environment are likely to affect other species that are more difficult to study.
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Indicator species analysis (ISA) (Dufrene & Legendre, 1997) was used to identify taxa (species, genera, and families) associated with each cluster or with the combination of clusters (De Caceres et al.
Indicator species analysis (Dufrene & Legendre 1997), or ISA, was used to identify particular orchid bee species that were strongly associated with a particular attractant.
One increasingly popular solution to this problem is to conduct an indicator species analysis (ISA) and use individual indicator species as management targets.
The main goal of this study was to develop a simple disturbance index that could be used in the area, as well as to determine the existence of indicator species that will allow quick conservation assessments.
The ordination techniques of TWINSPAN (Two Way Indicator Species Analysis) and DCA (Detrended
Collecting data about key indicator species - such as topshells - can provide information about how coastal systems are responding to factors such as increased sea temperatures.
Collecting data about key indicator species can provide information about how coastal systems are responding to factors such as increased sea temperatures.
In the indicator species analysis three calliphorid species were selected as significant indicators of a particular site type.
Species specific responses were analyzed using an indicator species analysis (Dufrene and Legendre 1997) utilizing the Monte-Carlo procedures (4999 permutations) with PC-ORD software (McCune and Mefford 1999).
The objectives of the present study were: (1) analyze the species in the family Calliphoridae at the PARNA Tijuca, (2) compare structural parameters such as abundance and species richness at the border and inside of the forest, (3) verify the presence of indicator species in the study area, and (4) from analysis of the species found, consider the possible influences of anthropogenic and abiotic factors on the blowfly fauna.
For the determination of indicator species (IndVal), the procedures used was those recommended by Dufrene and Legendre (1997), the input data were the abundance and frequency of occurrence of species in each group, calculating indicator values for each species (McCUNE; GRACE, 2002).
The spotted owl, also an indicator species, was listed in 1990 as a threatened species under the Endangered Species Act.