Genetic patterns of habitat fragmentation and past climate‐change effects in the Mediterranean high‐mountain plant <i>Armeria caespitosa</i> (Plumbaginaceae)

García‐Fernández, Alfredo; Iriondo, José María; Escudero, Adrián; Aguilar, Javier Fuertes; Feliner, Gonzalo Nieto

doi:10.3732/ajb.1200653

Cited by 17 publications

(16 citation statements)

References 105 publications

(122 reference statements)

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“…(Gómez-Gómez et al 2012), some species of Aquilegia L. (Garrido et al 2012), Armeria caespitosa Boiss. (García-Fernández et al 2013), Borderea chouardii (Li et al 2006), Lamyropsis microcephala (Moris) Dittrich & Greuter (Bacchetta et al 2013); Saxifraga florulenta Moretti (Szövényi et al 2009); S. rivularis Schult. (Guldahl et al 2005); and Rosa subsect.…”

Section: Discussionmentioning

confidence: 98%

“…Therefore, it can be reasonably assumed that the genetic structure is not explained by the model of isolation by distance suggesting alternate factors could influence genetic structure. It has been predicted that geographic distance between populations is not a useful indicator of historical population connectivity or current genetic structure (Arafeh et al 2002;Szövényi et al 2009;Bacchetta et al 2013;García-Fernández et al 2013). Though based on PCoA results (Fig.…”

Section: Discussionmentioning

confidence: 99%

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Differentiation between two self-compatible cytotypes of Herbertia lahue (Iridaceae): evidence from genotypic and phenotypic variation

et al. 2016

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The polyploid species Herbertia lahue (Molina) Goldblatt is widespread in the grassland areas of southern America. In this study, genotypic and phenotypic variations among hexaploids and octoploids from H. lahue were assessed based on quantitative floral traits and ISSR markers. Additionally, gynoecium and breeding systems were analysed through anatomical analysis and hand-pollination experiments. Cytotypes are self-compatible, and the anatomy of the embryo sac remains similar in hexaploids and octoploids. AMOVA indicates that hexaploid populations are less genetically variable than octoploids (respectively 4 and 22 %, P \ 0.001), thus the largest source of genetic variation for H. lahue lies among populations (82 %, P \ 0.001), probably a combined effect of selfing, changes in population size, and local adaptation. Genetic variation between cytotypes was significant (16 %, P \ 0.001), though unclear segregation among cytotypes was discovered through PCoA. A Mantel test indicated no relationship between geographic and genetic distances (r = 0.04; P = 0.37), possibly as a result of the combined effect of the recurrent origin of polyploids, gene flow restricted by selfing, and poor capacity for seed dispersal. In terms of floral measurements, eight measures of perigonium, androecium, and gynoecium varied significantly between cytotypes, though no clear grouping was defined by PCA. Presumably, complex variation in floral characters across cytotypes may result in the absence of distinct grouping by PCA. The combined use of ISSR markers and morphological characters revealed a complex relationship between H. lahue cytotypes shaped by both intrinsic and extrinsic factors.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Differentiation between two self-compatible cytotypes of Herbertia lahue (Iridaceae): evidence from genotypic and phenotypic variation

et al. 2016

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“…A. caespitosa is self-incompatible [31] and pollinated by bees, bumblebees and syrphid flies [31]. Previous studies on the population genetics of the species revealed relatively low genetic differentiation and a complex genetic structure among populations [40], [41].…”

Section: Methodsmentioning

confidence: 99%

Assessing Intraspecific Variation in Effective Dispersal Along an Altitudinal Gradient: A Test in Two Mediterranean High-Mountain Plants

et al. 2014

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BackgroundPlant recruitment depends among other factors on environmental conditions and their variation at different spatial scales. Characterizing dispersal in contrasting environments may thus be necessary to understand natural intraspecific variation in the processes underlying recruitment. Silene ciliata and Armeria caespitosa are two representative species of cryophilic pastures above the tree line in Mediterranean high mountains. No explicit estimations of dispersal kernels have been made so far for these or other high-mountain plants. Such data could help to predict their dispersal and recruitment patterns in a context of changing environments under ongoing global warming.MethodsWe used an inverse modelling approach to analyse effective seed dispersal patterns in five populations of both Silene ciliata and Armeria caespitosa along an altitudinal gradient in Sierra de Guadarrama (Madrid, Spain). We considered four commonly employed two-dimensional seedling dispersal kernels exponential-power, 2Dt, WALD and log-normal.Key ResultsNo single kernel function provided the best fit across all populations, although estimated mean dispersal distances were short (<1 m) in all cases. S. ciliata did not exhibit significant among-population variation in mean dispersal distance, whereas significant differences in mean dispersal distance were found in A. caespitosa. Both S. ciliata and A. caespitosa exhibited among-population variation in the fecundity parameter and lacked significant variation in kernel shape.ConclusionsThis study illustrates the complexity of intraspecific variation in the processes underlying recruitment, showing that effective dispersal kernels can remain relatively invariant across populations within particular species, even if there are strong variations in demographic structure and/or physical environment among populations, while the invariant dispersal assumption may not hold for other species in the same environment. Our results call for a case-by-case analysis in a wider range of plant taxa and environments to assess the prevalence and magnitude of intraspecific dispersal variation.

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“… Populations have been isolated for long enough to result in genetic differentiation (Segarra‐Moragues et al ., ; Gómez‐Gómez et al ., ; García‐Fernández et al ., ). This pattern results from the combined effects of bottlenecks and genetic drift and/or local adaptation (López‐Pujol et al ., ).…”

Section: Introductionmentioning

confidence: 97%

Narrow endemics in European mountains: high genetic diversity within the monospecific genus Pseudomisopates (Plantaginaceae) despite isolation since the late Pleistocene

Jiménez‐Mejías

Fernández‐Mazuecos

Amat

et al. 2015

Journal of Biogeography

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Aim The evolutionary history of narrow endemic species has received little attention compared with that of more widely distributed species. Small effective population sizes and long-term isolation of many narrow endemic species make research on their genetic make-up important for their future conservation. In this study we investigated the genetic variation and historical distribution of an isolated plant, the monospecific genus Pseudomisopates, as an example of the phylogeographical history of narrow endemics.Location Central Range, Iberian Peninsula, Mediterranean Europe.Methods We used amplified fragment length polymorphisms (AFLPs), nuclear and plastid DNA sequences and species distribution modelling. Sequence data were analysed using statistical parsimony, molecular dating, and a coalescent-based Bayesian model of isolation with migration. Genetic diversity and differentiation analyses based on AFLP data were performed. We compared the detection of clones using AFLPs with the results of a previous study that used simple sequence repeats (SSRs).Results AFLP analysis revealed that SSRs underestimate clone number. The coalescent-based Bayesian model of isolation with migration suggested a late Pleistocene divergence between the populations of Pseudomisopates on two mountain massifs (Gredos and La Serrota), despite the presence of a large area suitable for population admixture. Moderate to high levels of genetic diversity and high effective population sizes were inferred.Main conclusions Our results imply that the levels of genetic diversity within narrow endemic species from Mediterranean mountains could primarily be driven by extrinsic historical factors, rather than by intrinsic species-specific factors depending on their own biological characteristics. Narrow endemics are widely believed to harbour low genetic diversity because of small effective population sizes. However, this study and others on narrow endemic angiosperms demonstrate that narrow endemism does not necessarily result in low genetic diversity.

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Genetic patterns of habitat fragmentation and past climate‐change effects in the Mediterranean high‐mountain plant Armeria caespitosa (Plumbaginaceae)

Cited by 17 publications

References 105 publications

Differentiation between two self-compatible cytotypes of Herbertia lahue (Iridaceae): evidence from genotypic and phenotypic variation

Differentiation between two self-compatible cytotypes of Herbertia lahue (Iridaceae): evidence from genotypic and phenotypic variation

Assessing Intraspecific Variation in Effective Dispersal Along an Altitudinal Gradient: A Test in Two Mediterranean High-Mountain Plants

Narrow endemics in European mountains: high genetic diversity within the monospecific genus Pseudomisopates (Plantaginaceae) despite isolation since the late Pleistocene

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