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Linking climate data and demography to predict future population viability of a perennial herb
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Faculty of Science and Technology, Biology, Department of Ecology and Evolution.
Manuscript (Other academic)
URN: urn:nbn:se:uu:diva-96194OAI: oai:DiVA.org:uu-96194DiVA: diva2:170688
Available from: 2007-09-21 Created: 2007-09-21 Last updated: 2010-01-13Bibliographically approved
In thesis
1. Pollinators, Enemies, Drought, and the Evolution of Reproductive Traits in Primula farinosa
Open this publication in new window or tab >>Pollinators, Enemies, Drought, and the Evolution of Reproductive Traits in Primula farinosa
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, I combined comparative and experimental approaches to examine selection on reproductive traits and population differentiation in the insect-pollinated, self-incompatible, perennial herb Primula farinosa. More specifically, I (1) determined whether the effects of floral display and interactions with pollinators and seed predators, and plant reproductive success were frequency-dependent and affected by surrounding vegetation context, (2) examined the consequences of intermittent drought years on population dynamics using numerical simulations based on demographic data collected over seven years, (3) analyzed among-population differentiation in flowering phenology and reproductive allocation, and its relationship to soil-depth at the site of origin.

A field experiment suggested that conspicuous plants facilitate inconspicuous plants in terms of pollinator attraction, and that the facilitation effect is contingent on the height of the surrounding vegetation. Further experiments revealed that both mutualistic and antagonistic interactions can result in frequency-dependent selection on floral display. Among inconspicuous plants, both fruit initiation, and damage from seed predators increased with the proportion of the conspicuous morph. The relative strength of these effects, and therefore their net outcome on the relationship between morph ratio and seed production varied among years.

I combined information on vital rates and their relation to environmental conditions in simulations to predict future population viability in changing environments. Simulated stochastic population growth rate decreased with increasing frequency of drought years.

Reproductive allocation varied significantly among populations both in the field and in a common-garden experiment, but was correlated with soil depth at the site of origin only in the field. The results suggest that among-population variation in reproductive effort in the field mainly reflects plastic responses to environmental conditions, and that this plasticity may be adaptive. The common-garden experiment suggested that the study populations have diverged genetically in flowering time.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2007. 41 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 341
Ecology, Alternative reproductive strategies, climate change, facilitation, floral display, flowering phenology, frequency-dependent selection, genetic diversity, life-history strategies, local adaptation, pollination, predation, Primula farinosa, reproductive effort, soil disturbance, stochastic growth rate, Ekologi
National Category
Ecology Evolutionary Biology
urn:nbn:se:uu:diva-8207 (URN)978-91-554-6965-8 (ISBN)
Public defence
2007-10-12, Föreläsningssalen, Avdelningen för växtekologi, Villavägen 14, Uppsala, 10:00
Available from: 2007-09-21 Created: 2007-09-21 Last updated: 2016-04-25Bibliographically approved

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