Article

Dated historical biogeography of the temperate Loliinae (Poaceae, Pooideae) grasses in the Northern and Southern Hemispheres

High Polytechnic School of Huesca, University of Zaragoza, Ctra. Cuarte km 1, E-22071 Huesca, Spain.
Molecular Phylogenetics and Evolution (Impact Factor: 3.92). 04/2008; 46(3):932-57. DOI: 10.1016/j.ympev.2007.11.022
Source: PubMed

ABSTRACT

Divergence times and biogeographical analyses have been conducted within the Loliinae, one of the largest subtribes of temperate grasses. New sequence data from representatives of the almost unexplored New World, New Zealand, and Eastern Asian centres were added to those of the panMediterranean region and used to reconstruct the phylogeny of the group and to calculate the times of lineage-splitting using Bayesian approaches. The traditional separation between broad-leaved and fine-leaved Festuca species was still maintained, though several new broad-leaved lineages fell within the fine-leaved clade or were placed in an unsupported intermediate position. A strong biogeographical signal was detected for several Asian-American, American, Neozeylandic, and Macaronesian clades with different affinities to both the broad and the fine-leaved Festuca. Bayesian estimates of divergence and dispersal-vicariance analyses indicate that the broad-leaved and fine-leaved Loliinae likely originated in the Miocene (13My) in the panMediterranean-SW Asian region and then expanded towards C and E Asia from where they colonized the New World. Further expansions in America (10-3.8My) showed a predominant migratory route from North to South (N America<-->the Andes<-->Patagonia). This late Tertiary scenario of successive colonizations and secondary polyploid radiations in the southern hemisphere from the northern hemisphere was accompanied by occasional transcontinental long-distance dispersal events between South America and New Zealand. Multiple Pliocene dispersal events (3.6-2.5My) from the near SW European and NW African continents gave rise to the Macaronesian Loliinae flora, while a more recent Pleistocene origin (2-1My) is hypothesized for the high polyploid lineages that successfully colonized newly deglaciated areas in both hemispheres.

Download full-text

Full-text

Available from: Paul M. Peterson
  • Source
    • "which, red fescue (F. rubra) is often used as an amenity turfgrass (Gaut et al. 2000; Torrecilla and Catalán 2002; Inda et al. 2008). The European fescues were divided into six sections based on their morphological differences (Hackel 1882), but the latest revision of the world's fescues numbers 11 subgenera, each with many subdivisions (Alexeev 1986). "
    [Show abstract] [Hide abstract]
    ABSTRACT: The Lolium and Festuca genera have been treated as the most important groupings of temperate grasses in forage production and the turf industry. The two genera undoubtedly represent a closely allied complex of related species. The objective of this study was to obtain an overview of the diversity and genetic relationships among 59 accessions of 32 species of the Lolium–Festuca complex using sequence related amplified polymorphism (SRAP) markers. In total, 22 primer combinations amplified 269 polymorphic bands which were detected with an average of 12.23 alleles per SRAP locus. The average polymorphic rate (P) between the species studied was 100 %, demonstrating their high degree of genetic diversity. According to the POPGENE and AMOVA analyses, the inter-genera diversity and the variance between the two genera were both under 50 %. The dendrograms derived either by NTSYS or MEGA in addition to the PCO were consistent and clearly illustrated the relationships among representatives of the Lolium genus as well as the subgenus Festuca, Schedonorus and Leucopoa within the Festuca genus. The result of this study strongly supported the previous morphological separation into a “broad leaved” and “fine-leaved” clades, and it once again demonstrated the close relationship between the Lolium genus and the Schedonorus subgenus. This study also suggested the inclusion of F. mairei in subg. Schedonorus and to divide subgenus Leucopoa by moving sect. Leucopoa and sect. Breviaristatae into different subgenera. The analysis method described provides new methodologies for determining the phylogeny of these outbreeding species.
    Full-text · Article · Sep 2015 · Genetic Resources and Crop Evolution
  • Source
    • "The Iberian Peninsula was one of the most important climate refuges in Europe during the Pleistocene (Hewitt 1999) and became a secondary centre of diversification for many Mediterranean plants and animals (Sanmartín 2003; Oberprieler 2005; Inda et al. 2008; Micó et al. 2009). A good example of this Mediterranean mountain fauna is Proformica longiseta Collingwood, an endemic polygynous ant from southeastern Spain. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Proformica longiseta Collingwood is an endemic ant found in southeastern Spain that inhabits high mountains and is widespread within an altitude range. We have studied the population genetics and biogeography of 14 populations of P. longiseta throughout its distribution using microsatellites and mitochondrial data. Populations are strongly structured for both markers and show isolation by distance, which together with the absence of intra-population variation in mitochondrial DNA suggest strong female philopatry and limited male dispersal. In spite of this, no recent bottlenecks or inbreeding were detected. Finally, we report on a population currently located where it did not exist 14 years ago, above the usual altitudinal limit known for the species, which may be due to recent colonization enhanced by global warming.
    Full-text · Article · Sep 2015 · Population Ecology
    • "Later, another South American ancestor (the putative ancestor of M. mendocina and M. squarrosa) expanded in the opposite direction. Therefore, two, non-contemporaneous dispersal events must have occurred in the Munroa clade, and LDD appears to be a plausible explanation for its current distribution, as has been proposed for other amphitropical disjuncts (Xiang & Soltis, 2001; Winkworth et al., 2002; Sanmartín & Ronquist, 2004; Bell & Donoghue, 2005; de Queiroz, 2005; Renner, 2005; Blattner, 2006; Moore et al., 2006; Inda et al., 2008; Escudero et al., 2010; Jakob et al., 2010; Donoghue, 2011; Popp et al., 2011; Gillespie et al., 2012; Linder & Barker, 2014). The LDD hypothesis has been considered as difficult to prove (Winkworth et al., 2002; de Queiroz, 2005; Donoghue, 2011; Gillespie et al., 2012); however, as a result of the diversification time of Munroa and the current lack of fossil evidence (potential finding of fossils would change the situation ), it is not possible to accept the vicariance or stepping-stones hypothesis. "
    [Show abstract] [Hide abstract]
    ABSTRACT: Plant disjunctions have provided some of the most intriguing distribution patterns historically addressed by biogeographers. We evaluated the three hypotheses that have been postulated to explain these patterns [vicariance, stepping-stone dispersal and long-distance dispersal (LDD)] using Munroa, an American genus of grasses with six species and a disjunct distribution between the desert regions of North and South America. The ages of clades, cytology, ancestral characters and areas of distribution were investigated in order to establish relationships among species, to determine the time of divergence of the genus and its main lineages, and to understand further the biogeographical and evolutionary history of this genus. Bayesian inference recovered the North American M. pulchella as sister species to the rest. Molecular dating and ancestral area analyses suggest that Munroa originated in North America in the late Miocene–Pliocene (7.2 Mya; 8.2–6.5 Mya). Based on these results, we postulate that two dispersal events modelled the current distribution patterns of Munroa: the first from North to South America (7.2 Mya; 8.2–6.5 Mya) and the second (1.8 Mya; 2–0.8 Mya) from South to North America. Arid conditions of the late Miocene–Pliocene in the Neogene and Quaternary climatic oscillations in North America and South America were probably advantageous for the establishment of populations of Munroa. We did not find any relationship between ploidy and dispersal events, and our ancestral character analyses suggest that shifts associated with dispersal and seedling establishment, such as habit, reproductive system, disarticulation of rachilla, and shape and texture of the glume, have been important in these species reaching new areas. © 2015 The Linnean Society of London, Botanical Journal of the Linnean Society, 2015, 00, 000–000.
    No preview · Article · Jul 2015 · Botanical Journal of the Linnean Society
Show more