elective

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elective

(Selective), adjective alternative, bestowed by ballot, by vote, choosing, cooptive, disjunctive, on approval, open to choice
Associated concepts: elective franchise, elective office

elective

(Voluntary), adjective appointive, gratuitous, not required, optional, spontaneous
See also: adoptive, alternative, discretionary, disjunctive, spontaneous, voluntary
References in periodicals archive ?
We calculated the Manly-Chesson alpha index of selectivity for variable prey abundance and normalized it to get electivity (-1 is complete avoidance and +1 is complete preference) (Chesson 1978) to determine prey preference when appropriate.
The close agreement between taxa in fish stomachs and taxa in the water column is evidence for low electivity for Salton Sea tilapia when feeding within the water column.
Here, we document spatial variation in electivity in the Glanville fritillary butterfly, Melitaea cinxia (L.
An electivity index was used to determine herbivore preference for each species by ascertaining whether herbivory occurred at a rate predicted by species abundance (random selection; Jenkins, 1979; De Jager et al.
However, as is the case for electivity indices which may be influenced by external food availability (Strauss, 1979; Gras & Saint-Jean, 1982), this is probably due to a high dominance in the pelagic community of the more frequent and abundant prey items found in the stomachs of this species.
Reliability estimates for Ivlevs electivity index the forage ratio and a proposed linear index of food selection.
To determine gamekeepers' habitat selection of drive area, we used the Ivlev electivity index (Krebs 1989).
The proportions of shells and species in the community were also used to calculate electivity coefficients (E) based on the work by Ivlev (1961):