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ISOLATION BETWEEN AQUILEGIA FORMOSA AND A. PUBESCENS : A REPLY AND RECONSIDERATION

1976; Oxford University Press; Volume: 30; Issue: 3 Linguagem: Inglês

10.1111/j.1558-5646.1976.tb00940.x

1558-5646

Verne Grant,

Plant and animal studies

A recent study of the ecological and reproductive relationships between Aquilegia formosa and A. pubescens (Ranunculaceae) in the Sierra Nevada of California (Chase, 1971;Chase and Raven, 1975) differs substantially from an earlier paper of mine on the same subject (Grant, 1952).My 1952 paper dealt with several interrelated topics: ecological isolation, floral isolation, and introgression between the two species or semispecies A. formosa and A. pube.scens;and, in the light of this, the basic species groups and mode of adaptive radiation in the genus Aquilegia.The objective of Chase's (1971) and Chase and Raven's (1975) study was to reexamine and correct my 1952 story.The differences between the recent and the earlier treatments are numerous, and range from significant to trivial issues.I acknowledge that certain corrections are called for in the 1952 story.In fact I made some corrections in print myself years ago (Grant, 1963;Grant and Grant, 1964), which have not been picked up by Chase (1971) and Chase and Raven (1975).On certain points I am thus in agreement with Chase's and Raven's modification of the 1952 story.On other matters I have to disagree with Chase and Raven.I believe, however, that most of the substantive issues can be resolved.This review of the situation will attempt to straighten out some of the confusion surrounding the Aquilegia story.This task is complicated by differences between Chase (1971) and Chase and Raven (1975).Chase (1971) picks the Grant 1952 paper to pieces; Chase and Raven ( 1975) is greatly toned-down, and, moreover, deviates from Chase (1971) in the direction of Grant (1952) on a number of issues.Chase (1971) has to be considered here since it is in the public domain and enters into the background of Chase and Raven (1975).Likewise the 1963 and 1964 statements of Grant and Grant, which were not considered by Chase and Raven, must be brought into the picture.It is desirable to correct the errors of recent authors, as well as those in older publications, since many students accept uncritically the most recent statement on a controversial question (i.e., Macior, 1974, on Aquilegia).Field Studies.-Myfield studies of Aquilegia formosa and A. pubescens in the Saddlebag Lake area of the Sierras were carried out in 1950, 1956,