Population structure and cryptic species in the cosmopolitan rotifer Euchlanis dilatata

Kordbacheh, Azar; Garbalena, Guadalupe; Walsh, Elizabeth J.

doi:10.1093/zoolinnean/zlx027

Cited by 23 publications

(44 citation statements)

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“…In this case other factors may influence the genetic differentiation among lineages of B. quadridentatus. Similarly, several molecular surveys conducted on rotifers, including Brachionus, Synchaeta and Euchlanis have found high levels of genetic differentiation despite high dispersal ability of the studied species (Gómez et al, 2000;2002;Xiang et al, 2010;Obertegger, Fontaneto, & Flaim, 2012;Kimpel et al, 2015;Kordbacheh et al, 2017).…”

Section: Discussionmentioning

confidence: 79%

“…Therefore, it seems that extensive genetic and ecological variation in some rotifers can occur along with an apparent absence of morphological differentiation (Serra, Galiana, & Gómez, 1997;Mills et al, 2017). Cryptic species have also been reported in other monogonont rotifer based on genetic data, for example in Epiphanes senta (Müller, 1773) (Schröder & Walsh, 2007), Lecane bulla (Gosse, 1851) (Walsh, Schröder, Wallace, & Rico-Martinez, 2009), Testudinella clypeata (Müller, 1786) (Leasi et al, 2013), Polyarthra dolichoptera Idelson, 1925(Obertegger et al, 2014, Synchaeta pectinata (Ehrenberg, 1832) (Kimpel, Gockel, Gerlach, & Bininda-Emonds, 2015), Euchlanis dilatata Ehrenberg, 1832(Kordbacheh, Garbalena, & Walsh, 2017, Keratella cochlearis Gosse, 1851 (Cieplinski et al, 2017), Limnias melicerta Weisse, 1848 and L. ceratophylli Schrank, 1803 (Kordbacheh, Wallace, & Walsh, 2018) and several more (García-Morales & Elías-Gutiérrez, 2013). In addition some studies have used morphological and ecological analysis as well as crossmating experiments to examine cryptic diversity.…”

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confidence: 97%

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Cryptic molecular diversity in the morphologically variable rotiferan Brachionus quadridentatus (Rotifera: Monogononta)

García-Morales

Domínguez‐Domínguez

2019

RBT

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Brachionus quadridentatus is a morphologically variable species distributed worldwide. Its taxonomy is confusing due the numerous infrasubspecific variants described in the taxon. Here we explore genetic diversity of certain B. quadridentatus populations, using sequences of COI mtDNA and 18S rDNA genes. With traditional morphology (taxonomic keys), the specimens identified fell into three recognized variants: B. quadridentatus quadridentatus, B. quadridentatus f. brevispinus and B. quadridentatus f. cluniorbicularis. The coalescent species delimitation analysis highly supports the presence of at least three putative species within B. quadridentatus complex in agreement with the phylogenetic result and GMYC analysis with the 18S gene. Nevertheless, the morphological and mitochondrial information show that the variation within each of the three putative species is much more extensive, finding seven monophyletic and highly divergent genetic groups (>10%) that have congruence with the morphotypes found in this study and ABGD analysis, which display clear morphological differences mainly in the diagnostic characters.

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Section: Discussionmentioning

confidence: 79%

mentioning

confidence: 97%

Cryptic molecular diversity in the morphologically variable rotiferan Brachionus quadridentatus (Rotifera: Monogononta)

García-Morales

Domínguez‐Domínguez

2019

RBT

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“…The GMYC is a robust method that models branching thresholds for intraspecific (coalescent) and interspecific (speciation/diversification) patterns (Fujisawa and Barraclough 2013). This approach has been widely applied in a number of studies to identify cryptic diversity within morphologically defined species (e.g., Crivellaro et al 2017;Grabowski et al 2017;Kordbacheh et al 2017). The ultrametric trees for GMYC analyses were estimated in BEAST (Drummond and Rambaut 2007) using two priors (Yule model and Coalescent model with constant population size) and two rates of molecular evolution (constant and relaxed clock).…”

Section: Data Analysesmentioning

confidence: 99%

Evidence of hidden diversity and taxonomic conflicts in five stream fishes from the Eastern Zimbabwe Highlands freshwater ecoregion

Chakona¹,

Kadye²,

Bere³

et al. 2020

Preprint

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Stream fishes of the Eastern Afromontane region are among the least studied vertebrates in this region, despite the potential for harbouring cryptic diversity. The present study examined mitochondrial cytochrome oxidase subunit I (COI) sequence divergence in 153 specimens of stream fishes belonging to four genera and three families, [(Amphilius and Zaireichthys (Amphiliidae); Chiloglanis (Mochokidae); and Hippopotamyrus (Mormyridae)], in the Eastern Zimbabwe Highlands (EZH) freshwater ecoregion to explore the extent to which the current taxonomy conceals the ichthyofaunal diversity in the region. The General Mixed Yule Coalescent (GMYC) species delineation method identified 14 clusters within five currently recognised 'species' from the EZH ecoregion. Only one of these clusters represents a named species, while 13 of them represent candidate or undescribed species. Our results revealed that effective conservation of this region's unique biota is limited by the incomplete knowledge of taxonomic diversity and inaccurate mapping of species distribution ranges.

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“…The phylum Rotifera is comprised by at least 2,000 species defined by morphological characters (Segers, ). These morpho‐species often harbour a great amount of cryptic diversity that is commonly recognized based on DNA taxonomy (e.g., Gabaldón, Fontaneto, Carmona, Montero‐Pau, & Serra, ; Kordbacheh, Garbalena, & Walsh, ; Suatoni, Vicario, Rice, Snell, & Caccone, ). However, detailed morphological and ecological information is rare at the level of cryptic rotifer species as it is more challenging to obtain than DNA sequences (Leasi, Tang, De Smet, & Fontaneto, ; Mills et al., ; Papakostas, Michaloudi, Triantafyllidis, Kappa, & Abatzopoulos, ).…”

Section: Introductionmentioning

confidence: 99%

Mitonuclear discordance as a confounding factor in the DNA taxonomy of monogonont rotifers

et al. 2017

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Discordance between mitochondrial and nuclear phylogenies is being increasingly recognized in animals and may confound DNA-based taxonomy. This is especially relevant for taxa whose microscopic size often challenges any effort to distinguish between cryptic species without the assistance of molecular data. Regarding mitonuclear discordance, two strikingly contrasting scenarios have been recently demonstrated in the monogonont rotifers of the genus Brachionus. While strict mitonuclear concordance was observed in the marine B. plicatilis species complex, widespread hybridization-driven mitonuclear discordance was revealed in the freshwater B. calyciflorus species complex. Here, we investigated the frequency of occurrence and the potential drivers of mitonuclear discordance in three additional freshwater monogonont rotifer taxa, and assessed its potential impact on the reliability of DNA taxonomy results based on commonly used single markers. We studied the cryptic species complexes of Keratella cochlearis, Polyarthra dolichoptera and Synchaeta pectinata.Phylogenetic reconstructions were based on the mitochondrial barcoding marker cytochrome c oxidase subunit I gene and the nuclear internal transcribed spacer 1 locus, which currently represent the two most typical genetic markers used in rotifer DNA taxonomy. Species were delimited according to each marker separately using a combination of tree-based coalescent, distance-based and allele-sharing-based approaches. Mitonuclear discordance was observed in all species complexes with incomplete lineage sorting and unresolved phylogenetic reconstructions recognized as the likely drivers. Evidence from additional sources, such as morphology and ecology, is thus advisable for deciding between often contrasting mitochondrial and nuclear species scenarios in these organisms.

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Population structure and cryptic species in the cosmopolitan rotifer Euchlanis dilatata

Cited by 23 publications

References 95 publications

Cryptic molecular diversity in the morphologically variable rotiferan Brachionus quadridentatus (Rotifera: Monogononta)

Cryptic molecular diversity in the morphologically variable rotiferan Brachionus quadridentatus (Rotifera: Monogononta)

Evidence of hidden diversity and taxonomic conflicts in five stream fishes from the Eastern Zimbabwe Highlands freshwater ecoregion

Mitonuclear discordance as a confounding factor in the DNA taxonomy of monogonont rotifers

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