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PREDICTING HOST RANGE EVOLUTION: COLONIZATION OF CORONILLA VARIA BY COLIAS PHILODICE (LEPIDOPTERA: PIERIDAE)
Author(s) -
Karowe David N.
Publication year - 1990
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.1990.tb03852.x
Subject(s) - biology , pieridae , lepidoptera genitalia , fecundity , sympatry , range (aeronautics) , host (biology) , ecology , zoology , sympatric speciation , population , demography , materials science , sociology , composite material
Extensive sympatry is currently arising between the common sulfur butterfly, Colias philodice Latreille (Lepidoptera: Pieridae) and a potential leguminous host plant, Coronilla varia (L.). In laboratory trials, larval surviviorship and growth were higher on the primary host, Medicago sativa (L.), than on the nonhost C. varia . However, because females reared from C. varia were on average more fecund than females reared from M. sativa , fitness on C. varia (approximately as survivorship times fecundity) was commensurate with fitness on M. sativa . Thus, it is predicted that selection would favor oviposition on C. varia , if such behavior were to arise. In addition, significant among‐family variation exists for several measures of larval performance on both C. varia and M. sativa , indicating that C. philodice can potentially respond to selection for increased performance on each species. Moreover, larval performance was significantly positively correlated across these species, suggesting that selection for increased performance on each species will facilitate, not constrain, evolution of increased performance on the other. It is concluded that behavioral rather than physiological barriers currently account for the absence of C. philodice from C. varia and that, if such barriers are overcome, C. philodice will expand its host plant range to include C. varia .