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The effects of florivory and inbreeding on reproduction in hermaphrodites of the wild strawberry, Fragaria virginiana

Rohde, Alexandra Sasha (2010) The effects of florivory and inbreeding on reproduction in hermaphrodites of the wild strawberry, Fragaria virginiana. Master's Thesis, University of Pittsburgh. (Unpublished)

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Recently, the biotic context for sexual and mating system evolution in plants has received special attention, yet the significance of interactions with antagonists has only begun to be revealed. We investigated the effect of florivory on reproduction and inbreeding depression by simulating damage on selfed and outcrossed progeny of hermaphrodites of Fragaria virginiana and recording the response of reproduction, as well as measuring tolerance to florivory. While both florivory and inbreeding affected reproduction, their effects were independent with respect to sexual traits but not an asexual trait; inbreeding depression was florivory- and family-dependent, specifically, for plantlet production. Plants were intolerant to florivory in terms of flowers, moderately tolerant in terms of fruit, and most tolerant in terms of plantlets. However, only under severe damage was intolerance statistically significant. Inbreeding did little to change these patterns. Our findings suggest that florivory does not consistently influence inbreeding depression, but its indirect effects on plantlet production could lead to increased geitonogamous selfing. This, combined with previous work demonstrating increased autogamous selfing following weevil damage and knowledge of the mechanism of sex determination in this system, suggests that damage by weevils could contribute to the maintenance of hermaphrodites in gynodioecious F. virginiana populations.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Rohde, Alexandra Sashaarr46@pitt.eduARR46
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairAshman, Tia-Lynntia1@pitt.eduTIA1
Committee MemberTraw, Brianmbtraw@pitt.eduMBTRAW
Committee MemberTonsor, Stephentonsor@pitt.eduTONSOR
Committee MemberKalisz, Susankalisz@pitt.eduKALISZ
Date: 20 September 2010
Date Type: Completion
Defense Date: 4 August 2010
Approval Date: 20 September 2010
Submission Date: 17 August 2010
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Biological Sciences
Degree: MS - Master of Science
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Anthonomus; dioecy; Fragaria; mating system; tolerance; weevils
Other ID:, etd-08172010-115659
Date Deposited: 10 Nov 2011 20:00
Last Modified: 15 Nov 2016 13:49


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