Reproductive strategies in desert annuals: test of a fixed germination hypothesis

TitleReproductive strategies in desert annuals: test of a fixed germination hypothesis
Publication TypeThesis
Year of Publication1978
AuthorsFreas K
Number of Pages23
Date Published1978
UniversityNew Mexico State University
CityLas Cruces, New Mexico
Thesis TypeM.S. Thesispp
Call Number00668
Keywordsannual plant, germination, dissertation, dissertations, germination, annual plant, reproduction, annual plant, theses, thesis
AbstractIn order to optimize reproduction in unpredictable environments, Cohen has hypothesized that desert annual plant populations maintain a constant proportion of germinating seeds. The two mechanisms by which a population might maintain this germination proportion, constant at the level of the individual, or a constant population mean, have been investigated through a series of germination tests with the annual species, Pectis angustifolia Torr. (Lemonweed). Results indicate that neither of these mechanisms function to maintain a constant germination proportion. Rather, the data suggest an alternative optimal reproductive strategy by which germination proportion increases in response to increased precipitation.