American Journal of Botany, Vol 85, 1166, Copyright © 1998 by Botanical Society of America, Inc.

REPRODUCTIVE BIOLOGY

Is relative pollen production or removal a good predictor of relative male fitness? An experimental exploration with a wild strawberry (Fragaria virginiana, Rosaceae)

T Ashman

Understanding plant reproduction requires knowledge of genetic contributions through pollen and seeds. Since direct genetic assessments of fitness through pollen are often intractable, reproductive ecologists use components of male fitness such as pollen production and pollen removal as surrogates tot paternity. However, we know little of the strength of the relationship between these components and actual paternity. Here, I report on a study undertaken to examine the relationship of pollen production and removal with paternity in Fragaria virginiana, a wild strawberry. A morphological marker was used to track paternity in experimental arrays exposed to native pollinators. Relative pellen production proved to be a poor predictor of relative paternity in most arrays, and over all arrays there was no significant correlation between relative paternity and relative pellen production. In contrast, relative pollen removed correlated significantly and positively with proportion of seeds sired, suggesting that a plant's contribution to the pool of removed pellen is a good predictor of its male reproductive success. Deviations from expected paternity based on relative pollen removal suggest a systematic overestimation of the siring success of plants with low pollen removal. And, in at least one specific case, low pellen removal may be explained by delayed anther dehiscence, which could lower the effectiveness of the removed pellen.

This article has been cited by other articles:

				L. F. Delph and T.-L. Ashman Trait selection in flowering plants: how does sexual selection contribute? Integr. Comp. Biol., August 1, 2006; 46(4): 465 - 472. [Abstract] [Full Text] [PDF]

				D. E. Giblin Variation in floral longevity between populations of Campanula rotundifolia (Campanulaceae) in response to fitness accrual rate manipulation Am. J. Botany, October 1, 2005; 92(10): 1714 - 1722. [Abstract] [Full Text] [PDF]

				C. N. Hayes, J. A. Winsor, and A. G. Stephenson A comparison of male and female responses to inbreeding in Cucurbita pepo subsp. texana (Cucurbitaceae) Am. J. Botany, January 1, 2005; 92(1): 107 - 115. [Abstract] [Full Text] [PDF]

				I. Dohzono, K. Suzuki, and J. Murata Temporal changes in calyx tube length of Clematis stans (Ranunculaceae): a strategy for pollination by two bumble bee species with different proboscis lengths Am. J. Botany, December 1, 2004; 91(12): 2051 - 2059. [Abstract] [Full Text] [PDF]

				K. Niovi Jones and J. S. Reithel Pollinator-mediated selection on a flower color polymorphism in experimental populations of Antirrhinum (Scrophulariaceae) Am. J. Botany, March 1, 2001; 88(3): 447 - 454. [Abstract] [Full Text]