obligate

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obligate

[′äb·lə·gət]
(biology)
Restricted to a specified condition of life, as an obligate parasite.
References in periodicals archive ?
The lizard genus Cnemidophorus includes a number of all-female, obligately parthenogenetic species (Wright 1993).
Rocky Mountain spotted fever (RMSF) is caused by Rickettsia rickettsii, a small gram-negative bacillus that is an obligately intracellular bacterium.
By that point, he notes, conditions should have turned ideal "for the growth of the obligately anaerobic sulfate-reducing bacteria, with all the attendant problems of sulfide production and corrosion.
Consistent with this expectation, a considerable excess of homozygotes has been found within populations of species of Botrychium and Mankyua (Ophioglossaceae), which have subterranean gametophytes that obligately self-fertilize via intragametophytic selfing (McCauley et al.
interexta are considered facultative or marginal vernal pool species; they are often associated with moist depressions and other seasonally wet habitats, but are not obligately tied to vernal depressions as are the core clade members.
The Australasian Gannet (Morus serrator) is a predominantly monogamous seabird with an obligately biparental system, endemic to Australia and New Zealand (Nelson 1978, Ismar et al.
a halophilic obligately anaerobic bacterium producing endospores with attached gas vacuoles.