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Inbreeding Depression in Schiedea globosa and S. Salicaria (Caryophyllaceae), Subdioecious and Gynodioecious Hawaiian Species

Ann K. Sakai, Keith Karoly and Stephen G. Weller
American Journal of Botany
Vol. 76, No. 3 (Mar., 1989), pp. 437-444
Stable URL: http://www.jstor.org/stable/2444614
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Inbreeding Depression in Schiedea globosa and S. Salicaria (Caryophyllaceae), Subdioecious and Gynodioecious Hawaiian Species
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Abstract

Progeny produced by inbreeding were compared to progeny derived from outcrosses for gynodioecious Schiedea salicaria and subdioecious S. globosa to assess fitness consequences of breeding system on parental fecundity (seeds per capsule) and progeny measures of fitness (germination, survival, biomass, and number of flowers) Results from both species indicated that inbreeding depression occurred at all measured stages of the life history. In both species, different females showed different levels of inbreeding depression. Multiplicative fitness functions of the ratio of values for selfed and outcrossed progeny in S salicaria resulted in inbreeding depression values of 0.62-0.94 Within- vs between-family crosses of S globosa also resulted in inbreeding depression values as high as 0.49. These values suggest that inbreeding depression may promote the evolution of dioecy within S globosa and S. salicaria, depending on the levels of natural outcrossing.

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