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Mutualists and antagonists mediate frequency-dependent selection on floral display
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Ecological Botany.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Evolution, Ecological Botany.
2008 (English)In: Ecology, ISSN 0012-9658, E-ISSN 1939-9170, Vol. 89, no 6, 1564-1572 p.Article in journal (Refereed) Published
Abstract [en]

Theory predicts that, with conflicting selection pressures mediated by mutualists and antagonists, alternative reproductive strategies can be maintained by negative frequency-dependent selection if it results in rare-morph advantage. We combined field experiments and surveys of natural populations to determine whether selection on. oral display is frequency dependent in the self-incompatible herb Primula farinosa, which is polymorphic for inflorescence height and occurs in a short-scaped and a long-scaped morph. Among short-scaped plants, both pollination success, quantified as initiation of fruits and seeds, and seed predation were positively correlated with the relative frequency of the long-scaped morph. The relative strength of these effects and the direction of the resulting frequency-dependent selection on scape morph varied among years and populations. The results suggest that both mutualists and antagonists may mediate frequency-dependent selection and that frequency dependence may vary from positive to negative with rare-morph advantage, depending on the relative strength of these interactions.

Place, publisher, year, edition, pages
2008. Vol. 89, no 6, 1564-1572 p.
Keyword [en]
alternative reproductive strategies, facilitation, floral display, frequency-dependent selection, genetic diversity, pollination, positive interactions, predation, Primula farinosa, Sweden
National Category
Ecology
Research subject
Ecological Botany
Identifiers
URN: urn:nbn:se:uu:diva-96193DOI: 10.1890/07-1283.1ISI: 000256540300010OAI: oai:DiVA.org:uu-96193DiVA: diva2:170687
Available from: 2007-09-21 Created: 2007-09-21 Last updated: 2017-12-14Bibliographically 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.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 341
Keyword
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
Identifiers
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
Opponent
Supervisors
Available from: 2007-09-21 Created: 2007-09-21 Last updated: 2016-04-25Bibliographically approved

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Toräng, PerÅgren, Jon

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