Patterns and processes in the genetic differentiation of the Brachionus calyciflorus complex, a passively dispersing freshwater zooplankton

Xiang, Xian-Ling; Xi, Yi-Long; Wen, Xin-Li; Zhang, Gen; Wang, Jinxia; Hu, Ke

doi:10.1016/j.ympev.2011.02.011

Cited by 35 publications

(29 citation statements)

References 67 publications

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“…This work formed the basis for the recent (re‐)description of four species, B. calyciflorus , Brachionus dorcas , Brachionus elevatus , and Brachionus fernandoi (Michaloudi et al., ). Several of these cryptic species have been found to coexist (Xiang et al., 2011b; Zhang et al., ). There is hardly any information available about how they differ ecologically.…”

Section: Introductionmentioning

confidence: 99%

Patterns of differentiation in the life history and demography of four recently described species of the Brachionus calyciflorus cryptic species complex

et al. 2019

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Brachionus calyciflorus is arguably the most studied freshwater monogonont rotifer. Although it has been recognised as a cryptic species complex for more than a decade, a formal (re‐)description of the four species known so far (B. calyciflorus, Brachionus dorcas, Brachionus elevatus, and Brachionus fernandoi) has only recently been made. Information on the ecology of these species is very scant and fragmented. The aim of this study was to test for ecological divergence between these four species, specifically their life history strategy and population demography. We conducted a life history experiment using 12–16 genotypes per species. For each species, genotypes were extracted from at least three different natural populations. In addition, we performed population‐level culture experiments with the aim to compare population growth rates and demographic structure of experimental populations among species. Finally, we searched the literature for life history studies with molecular data allowing retrospective species identification. We found pronounced differences in life history traits between B. fernandoi and the other three species. B. fernandoi had higher egg and juvenile development times and a lower egg production rate and mictic ratio. We detected no significant life history differences among B. calyciflorus, B. elevatus, and B. dorcas. Population growth rates of B. fernandoi and B. calyciflorus were higher than those of B. elevatus and B. dorcas. Life history divergence resulted in marked differences in the demographic structure of populations. Populations of B. fernandoi contained larger fractions of pre‐reproductive females and lower fractions of adult females with sexual eggs than populations of B. calyciflorus, B. elevatus, and B. dorcas. Mortality was found to be highest in B. elevatus and lowest in B. calyciflorus populations. Our results show that a reverse taxonomy approach is powerful in revealing sources of variation in ecologically relevant traits of cryptic species, such as life history and demographic structure. Explicit consideration of this variation is crucial for future studies of their dynamics in natural communities.

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Section: Introductionmentioning

confidence: 99%

Patterns of differentiation in the life history and demography of four recently described species of the Brachionus calyciflorus cryptic species complex

et al. 2019

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“…In the last two decades, many potential cryptic rotifer species which were genetically divergent but morphologically similar have been discriminated and subdivided such as the monogont rotifers through the application of molecular phylogenetics and mating tests (Ciros-P erez et al 2001;G omez et al, 2002b;Derry et al 2003;Gilbert & Walsh 2005;Schr€ oder & Walsh 2007;Xiang et al 2011aXiang et al , 2011b) and the bdelloid rotifers using a coalescent approach Fontaneto et al 2007Fontaneto et al , 2008Fontaneto et al , 2009Fontaneto et al , 2011. The effects of such hidden diversity are usually overlooked in ecological studies.…”

Section: Introductionmentioning

confidence: 99%

Differences in life history characteristics among three sympatric evolutionary species of theRotaria rotatoriacomplex

Xiang

Jiang

Tao

et al. 2016

Journal of Freshwater Ecology

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The Bdelloidea rotifer, a kind of asexually microscopic invertebrate, is the largest Metazoan group that reproduces only through parthenogenesis. Here the potential evolutionary species composition was analyzed using a coalescent approach to infer independently evolving entities from a phylogenetic tree obtained from cytochrome oxidase I sequences. Three clones (HX4, HX8 and HX19) of Bdelloidea Rotaria rotatoria were selected to be the representatives of three sympatric putative cryptic taxa for detecting the effects of temperature (24, 28 and 32 ℃) on their life history traits. The results showed that the responses of life table parameters to increasing temperature were different among the three evolving entities. Evolutionary species, temperatures and their interaction significantly affected all life history parameters except that evolutionary species did not significantly affect the durations of post-reproductive period and mean lifespan. In addition, the interaction of evolutionary species and temperatures did not significantly affect the durations of postreproductive period, offspring production or net reproductive rate. No matter what the evolutionary species was, the age-specific survival curves tended to decrease earlier and more quickly, and the peak of age-specific fecundity curves appeared earlier with increasing temperature. The three potential cryptic R. rotatoria taxa adopted variable life history strategies, low reproduction and high survivorship at low temperature, as well as high reproduction and low survivorship at high temperature. The similar adaptation abilities of HX4, HX8 and HX19 to water temperatures could be the best explanation for their coexistence in the subtropical shallow pond at a high temperature.

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“…Mitogenome sequence of one of the most abundant and most studied monogonont rotifers, Brachionus calyciflorus , is currently not available. It is a cryptic species complex, occurring in freshwater ecosystems, that represents an excellent system for inferring the evolutionary processes of phylogeographic structure due to its patchy nature of habitats, lack of hybridization and cyclical parthenogenesis [18,19]. In order to further explore the phenomenon of fragmented mitogenomes in monogonont rotifers, we have sequenced and analysed the mitogenome of Brachionus calyciflorus .…”

Section: Introductionmentioning

confidence: 99%

Monogonont Rotifer, Brachionus calyciflorus, Possesses Exceptionally Large, Fragmented Mitogenome

Nie

et al. 2016

PLoS ONE

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In contrast to the highly conserved mitogenomic structure and organisation in most animals (including rotifers), the two previously sequenced monogonont rotifer mitogenomes were fragmented into two chromosomes similar in size, each of which possessed one major non-coding region (mNCR) of about 4–5 Kbp. To further explore this phenomenon, we have sequenced and analysed the mitogenome of one of the most studied monogonont rotifers, Brachionus calyciflorus. It is also composed of two circular chromosomes, but the chromosome-I is extremely large (27 535 bp; 3 mNCRs), whereas the chromosome-II is relatively small (9 833 bp; 1 mNCR). With the total size of 37 368 bp, it is one of the largest metazoan mitogenomes ever reported. In comparison to other monogononts, gene distribution between the two chromosomes and gene order are different and the number of mNCRs is doubled. Atp8 was not found (common in rotifers), and Cytb was present in two copies (the first report in rotifers). A high number (99) of SNPs indicates fast evolution of the Cytb-1 copy. The four mNCRs (5.3–5.5 Kb) were relatively similar. Publication of this sequence shall contribute to the understanding of the evolutionary history of the unique mitogenomic organisation in this group of rotifers.

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Patterns and processes in the genetic differentiation of the Brachionus calyciflorus complex, a passively dispersing freshwater zooplankton

Cited by 35 publications

References 67 publications

Patterns of differentiation in the life history and demography of four recently described species of the Brachionus calyciflorus cryptic species complex

Patterns of differentiation in the life history and demography of four recently described species of the Brachionus calyciflorus cryptic species complex

Differences in life history characteristics among three sympatric evolutionary species of theRotaria rotatoriacomplex

Monogonont Rotifer, Brachionus calyciflorus, Possesses Exceptionally Large, Fragmented Mitogenome

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