564 Invasive Stink Bugs and Related Species (Pentatomoidea)
Univoltinism: type of seasonal development with univoltine seasonal cycles. Synonym: Monovoltinism.
See Univoltine seasonal development
Vegetation season: see Vegetative season
Vegetative season: period of time in a year when the climate is prime for plants to experience the most
growth. Synonyms: Growing season, Vegetation season
Vital factor: see Vital function of ecological factors
Vital function of ecological factors: reflects dual mode of action of ecological factors (primarily tem-
perature, but also light, food, etc.) on living organisms; determines a range within which a
particular species can live (Tyshchenko 1980). See Signal function of ecological factors
Volt i n i s m: term used to indicate the number of generations realized/produced by a population during
a year
Wing muscle seasonal polyphenism: special case of polyphenism when degree of development of
wing muscles change during a vegetative season or year; strongly linked to flight ability
Wing polymorphism: special case of polymorphism when within a population two or more discrete
genetically controlled morphs (or forms) exist with wings of different length or degree of devel-
opment (e.g., with fully developed, reduced, or totally absent wings). See, for example, Long-
winged adults, Short-winged adults, and Apterous adults
Wing polyphenism: special case of polyphenism when, within a population, two or more discrete phe-
notypes (i.e., forms) with wings of different length or degree of development (e.g., with fully
developed, reduced, or totally absent wings) are produced by one genotype under different
environmental conditions. See, for example, Long-winged adults, Short-winged adults, and
Apterous adults
Winglessness: see Aptery
Winter diapause: diapause that takes place in winter; one of two seasonal classes of diapause. Synonym:
Hibernation