Population Dynamics and Local Specialization in a Clonal Perennial (Ranunculus Repens): I. The Dynamics of Ramets in Contrasting Habitats

Doust, Lesley Lovett

doi:10.2307/2259633

Cited by 640 publications

(94 citation statements)

References 16 publications

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“…In higher light environments, individuals produce ramets with short spacers early in the growing season or they escape to/explore different environments by continuously producing ramets with longer spacers until the end of the growing season. These results are suggestive of the Phalanx and Guerrilla strategies that have been described for clonal plants (Lovett Doust 1981). Our previous studies demonstrated that S. americanus had both Phalanx and Guerrilla strategies within relatively small-scale environments (Ikegami et al 2007).…”

Section: Summary and Perspectivesupporting

confidence: 76%

“…By repeatedly producing genetically identical ramets, clonal plants develop a variety of architectural forms that result from the formation of spacers (rhizomes, stolons or roots) of different lengths, different numbers of branches and different branching angles, all of which result in the placement of ramets in space and time. The complexity of clonal architectures differs among plant species or within the same species growing in different environments (Bell 1980(Bell , 1984Lovett Doust 1981;de Kroon and Knops 1990;Hutchings and de Kroon 1994;Ikegami 2004;Ikegami et al 2006). Clonal plants may locally change the architectural elements of their morphology, such as by producing shorter spacers to occupy local resource patches or by producing longer spacers to place new ramets in areas where resources may be greater or competition may be less (Slade and Hutchings 1987a, b, c;Dong and de Kroon 1994;de Kroon and Hutchings 1995;Dong 1996;Ikegami et al 2007).…”

Section: Introductionmentioning

confidence: 99%

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Ramet phenology and clonal architectures of the clonal sedge Schoenoplectus americanus (Pers.) Volk. ex Schinz & R. Keller

2008

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The clonal plant Schoenoplectus americanus shows variable belowground clonal architecture as a result of producing two types of ramets: those with very long rhizomes (long rhizome ramet, LRR) and those with very short ones (short rhizome ramet, SRR). In a previous study we demonstrated that the two types of ramets are functionally specialised. The production of SRRs results in the formation of consolidated clonal patches with densely packed shoots, while the production of LRRs results in a more diffuse network of connected rhizomes with widely spaced shoots. We hypothesised that the two types of ramets would be produced at different times during the growing season because of their functional differences. The production of LRRs throughout the growing season would enable the species to continuously explore new habitats while the production of SRRs early in the growing season would enable the species to occupy and consolidate resources in available open patches. We evaluated this hypothesis through field observations in different communities with S. americanus and indeed found that SRRs were produced early in the growing season while LRRs tended to be produced over an extended period of time. Plants in high-quality environments (i.e. higher light conditions) produced more SRRs, and these were formed early in the growing season. In contrast, plants in low-quality environments produced more LRRs, and these were formed continuously over the growing season. We also observed that the shoot longevity was greater for SRR. In high-quality patches, the production of the lower cost SRRs results in a more rapid occupancy of open spaces; in lower quality patches, the production of LRRs throughout the growing season enables plants to explore the immediate environment for higher quality patches.

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Section: Summary and Perspectivesupporting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

Ramet phenology and clonal architectures of the clonal sedge Schoenoplectus americanus (Pers.) Volk. ex Schinz & R. Keller

2008

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“…(Asteraceae), the flat-topped goldenrod, is a rhizomatous perennial herb that was formerly classified as a member of the genus Solidago (formerly Solidago graminifolia , Gleason & Cronquist, 1991). Unlike the common goldenrod ( Solidago canadensis ), E. graminifolia is a guerilla-type species ( sensu Lovett Doust, 1981), characterized by rapid clonal spread via rhizomes and almost no recruitment from seed in established populations (Price, 2003). It prefers moist rich soil, but is found in almost all soil types, especially along roadsides, fallow fields and open woodlands (Deam, 1940).…”

Section: Study Systemmentioning

confidence: 99%

Genotype, environment, and genotype by environment interactions determine quantitative resistance to leaf rust (Coleosporium asterum) in Euthamia graminifolia (Asteraceae)

2004

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Summary• The strength and consistency of genotypic differences in disease resistance determine the potential for resistance evolution in host populations that rely on vegetative reproduction. Here we surveyed infection intensity of host genotypes across space and time to estimate genotypic and environmental effects on quantitative disease resistance.• Cloned fragments of 12 Euthamia graminifolia genotypes were grown in unweeded experimental fields and outdoor pots. Infection intensity was surveyed during 2 yr of natural infection by the non-systemic rust pathogen, Coleosporium asterum .• Five of six surveys detected infection intensity differences among genotypes, despite substantial variation in mean infection intensity across surveys. When resistance was defined relative to local pathogen density, 10 -40% of resistance variation was due to host genotype. Although two genotypes exhibited greater resistance across environments, G × E interactions in resistance were common. Furthermore, infection intensity was unrelated to host size.• We conclude that quantitative resistance level can evolve in this system and show how logistic analysis (relative to local pathogen density) can provide insight into the mechanism(s) responsible for G × E interactions in infection intensity.

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“…Such systems are numerous, with clonal spread being especially subject to recurrent investigation in plant ecology [13,43,44]. The particular example that we examined lies at the intersection of two areas of interest in plant ecology: the role of ramet positioning in small-scale vegetation composition [45][46][47][48] and ramet placement plasticity and its effect on plant behaviour [10,49,50]. Our model can serve as a suitable null model of ramet positioning to test hypotheses regarding environmental effects, enabling further inquiry into both of these topics.…”

Section: (B) Conclusion and Implicationmentioning

confidence: 99%

A simple model for the influence of habitat resource availability on lateral clonal spread

Weiser

Smyčka

2015

Proc. R. Soc. B.

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Plant clonal spread is ubiquitous and of great interest, owing both to its key role in plant community assembly and its suitability for plant behaviour research. However, mechanisms that govern spreading distance are not well known. Here we link spacer costs and below-ground competition in a simple model of growth in a homogeneous below-ground environment, in which optimal distance between ramets is based on minimizing the sum of these costs. Using this model, we predict a high prevalence of clonal growth that does not employ spacers in resource-poor environments and a nonlinear increase in spreading distance in response to increasing below-ground resource availability. Analysis of database data on clonal growth in relationship to below-ground resource availability revealed that patterns of the spread based on stolons is compatible with the model's predictions. As expected, model prediction failed for rhizomatous species, where spacer sizes are likely to be selected mainly to play roles other than spread. The model's simplicity makes it useful as a null model in testing hypotheses about the effects of environmental heterogeneity on clonal spread.

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Population Dynamics and Local Specialization in a Clonal Perennial (Ranunculus Repens): I. The Dynamics of Ramets in Contrasting Habitats

Cited by 640 publications

References 16 publications

Ramet phenology and clonal architectures of the clonal sedge Schoenoplectus americanus (Pers.) Volk. ex Schinz & R. Keller

Ramet phenology and clonal architectures of the clonal sedge Schoenoplectus americanus (Pers.) Volk. ex Schinz & R. Keller

Genotype, environment, and genotype by environment interactions determine quantitative resistance to leaf rust (Coleosporium asterum) in Euthamia graminifolia (Asteraceae)

A simple model for the influence of habitat resource availability on lateral clonal spread

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