Fluvial basin history in the northeastern Mediterranean region underlies dispersal and speciation patterns in the genus Dugesia (Platyhelminthes, Tricladida, Dugesiidae)

Solà, Eduard; Sluys, Ronald; Gritzalis, Konstantinos; Riutort, Marta

doi:10.1016/j.ympev.2012.11.010

Cited by 49 publications

(58 citation statements)

References 54 publications

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“…We used the uncorrelated lognormal relaxed clock model with a mean substitution rate of 0.017 nucleotide substitutions per site and per million years (Solà et al, 2013).…”

Section: Phylogenetic Analysismentioning

confidence: 99%

Insights into the origin and distribution of biodiversity in the Brazilian Atlantic forest hot spot: a statistical phylogeographic study using a low-dispersal organism

et al. 2014

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The relative importance of the processes that generate and maintain biodiversity is a major and controversial topic in evolutionary biology with large implications for conservation management. The Atlantic Forest of Brazil, one of the world's richest biodiversity hot spots, is severely damaged by human activities. To formulate an efficient conservation policy, a good understanding of spatial and temporal biodiversity patterns and their underlying evolutionary mechanisms is required. With this aim, we performed a comprehensive phylogeographic study using a low-dispersal organism, the land planarian species Cephaloflexa bergi (Platyhelminthes, Tricladida). Analysing multi-locus DNA sequence variation under the Approximate Bayesian Computation framework, we evaluated two scenarios proposed to explain the diversity of Southern Atlantic Forest (SAF) region. We found that most sampled localities harbour high levels of genetic diversity, with lineages sharing common ancestors that predate the Pleistocene. Remarkably, we detected the molecular hallmark of the isolation-by-distance effect and little evidence of a recent colonization of SAF localities; nevertheless, some populations might result from very recent secondary contacts. We conclude that extant SAF biodiversity originated and has been shaped by complex interactions between ancient geological events and more recent evolutionary processes, whereas Pleistocene climate changes had a minor influence in generating present-day diversity. We also demonstrate that land planarians are an advantageous biological model for making phylogeographic and, particularly, fine-scale evolutionary inferences, and propose appropriate conservation policies.

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“…We used the uncorrelated lognormal relaxed clock model with a mean substitution rate of 0.017 nucleotide substitutions per site and per million years (Solà et al, 2013).…”

Section: Phylogenetic Analysismentioning

confidence: 99%

Insights into the origin and distribution of biodiversity in the Brazilian Atlantic forest hot spot: a statistical phylogeographic study using a low-dispersal organism

et al. 2014

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“…Nonetheless, one must be very careful with this type of data, since without having representatives of all the species within a genus, it is not possible to ensure that the feature is particular for a species and hence unambiguously allows its identification. In the case of Dugesia, further analyses showed that the ITS-1 29bp duplication was not characteristic of a single species, but of a group of very closely related ones, including D. sicula and D. aethiopica Stocchino, Corso, Manconi and Pala, 2002 [9,10]. The other interesting result from that study was that a population of Dugesia coming from the northern Iberian Peninsula did not belong to the D. subtentaculata Draparnaud, 1801 species; instead it grouped with a species from northern Italy, D. etrusca Benazzi, 1946.…”

Section: Assignment Of Individuals To Their Species: Dna Barcoding Inmentioning

confidence: 99%

Planarian (Platyhelminthes, Tricladida) Diversity and Molecular Markers: A New View of an Old Group

Álvarez‐Presas

Riutort

2014

Diversity

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Planarians are a group of free-living platyhelminths (triclads) best-known largely due to long-standing regeneration and pattern formation research. However, the group's diversity and evolutionary history has been mostly overlooked. A few taxonomists have focused on certain groups, resulting in the description of many species and the establishment of higher-level groups within the Tricladida. However, the scarcity of morphological features precludes inference of phylogenetic relationships among these taxa. The incorporation of molecular markers to study their diversity and phylogenetic relationships has facilitated disentangling many conundrums related to planarians and even allowed their use as phylogeographic model organisms. Here, we present some case examples ranging from delimiting species in an integrative style, and barcoding them, to analysing their evolutionary history on a lower scale to infer processes affecting biodiversity origin, or on a higher scale to understand the genus level or even higher relationships. In many cases, these studies have allowed proposing better classifications and resulted in taxonomical changes. We also explain shortcomings resulting in a lack of resolution or power to apply the most up-to-date data analyses. Next-generation sequencing methodologies may help improve this situation and accelerate their use as model organisms.

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“…Clock rates were used to describe a lognormal prior for the estimated clock rate, where 95% of the probability density was contained within highest and lowest values taken from the literature. For the temnocephalans these values were 0.0027 and 0.015 substitutions/site/lineage/million years ( Schmidtea mediterranea , Platyhelminthes: Lazaro et al, 2011; Dugesia , Platyhelminthes: Sola et al, 2013). For the crayfish the values were 0.0083 and 0.012 substitutions/site/lineage/million years ( Chirocephalus , Crustacea: Ketmaier, Argano & Caccone, 2003).…”

Section: Methodsmentioning

confidence: 99%

Shared phylogeographic patterns between the ectocommensal flatwormTemnosewellia albataand its host, the endangered freshwater crayfishEuastacus robertsi

Hurry

Schmidt

Ponniah

et al. 2014

PeerJ

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Comparative phylogeography of commensal species may show congruent patterns where the species involved share a common history. Temnosewellia is a genus of flatworms, members of which live in commensal relationships with host freshwater crustaceans. By constructing phylogenetic trees based on mitochondrial COI and 28S nuclear ribosomal gene sequences, this study investigated how evolutionary history has shaped patterns of intraspecific molecular variation in two such freshwater commensals. This study concentrates on the flatworm Temnosewellia albata and its critically endangered crayfish host Euastacus robertsi, which have a narrow climatically-restricted distribution on three mountaintops. The genetic data expands upon previous studies of Euastacus that suggested several vicariance events have led to the population subdivision of Euastacus robertsi. Further, our study compared historical phylogeographic patterning of these species. Our results showed that phylogeographic patterns shared among these commensals were largely congruent, featuring a shared history of limited dispersal between the mountaintops. Several hypotheses were proposed to explain the phylogeographic points of differences between the species. This study contributes significantly to understanding evolutionary relationships of commensal freshwater taxa.

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Fluvial basin history in the northeastern Mediterranean region underlies dispersal and speciation patterns in the genus Dugesia (Platyhelminthes, Tricladida, Dugesiidae)

Cited by 49 publications

References 54 publications

Insights into the origin and distribution of biodiversity in the Brazilian Atlantic forest hot spot: a statistical phylogeographic study using a low-dispersal organism

Insights into the origin and distribution of biodiversity in the Brazilian Atlantic forest hot spot: a statistical phylogeographic study using a low-dispersal organism

Planarian (Platyhelminthes, Tricladida) Diversity and Molecular Markers: A New View of an Old Group

Shared phylogeographic patterns between the ectocommensal flatwormTemnosewellia albataand its host, the endangered freshwater crayfishEuastacus robertsi

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