Karyotypes of S and L type rotifers Brachionus plicatilis O.F. Müller

Rumengan, Inneke F. M.; Kayano, Hiroshi; Hirayama, Kazutsugu

doi:10.1016/0022-0981(91)90162-p

Cited by 39 publications

(21 citation statements)

References 15 publications

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“…However, the ridges are small and condensed in B. rotundiformis . Besides, the variation in the distribution of pores on the egg surface, as well as size and shape of resting eggs in the two species, further confirms the earlier reports (Fu et al, 1991 a, b ;Rumengan et al, 1991 ;Fu et al ., 1993 ;Hirayama & Rumengan, 1993) . Furthermore, the surface topography of these species also differ from other resting eggs of congeneric species such as B. calyciflorus .…”

Section: Discussionsupporting

confidence: 79%

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Structural differences between the resting eggs of Brachionus plicatilis and Brachionus rotundiformis (Rotifers, Brachionidae): an electron microscopic study

et al. 1996

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Surface topography and layering of resting eggs of Brachionus plicatilis and B . rotundiformis are described, based on scanning and transmission electron microscope studies . In B . plicatilis, the resting eggs are spherical with smooth wavy ridges on the surface, whereas these ridges are small and condensed in B. rotundiformis . The distribution of pores on the egg surface clearly distinguishes the two species .Ultrastructure of the egg membranes of both species varies greatly with regard to size, shape and sculpturing of each membrane . The alveolar and dense sublayers, which constitute the outer egg membrane (S1) are very thick (10-12 µm) in B . rotundiformis compared to B . plicatilis (4-5 µm) . Thus, each species has a characteristic surface and membrane architecture . The functional roles of these membranes, during the resting phase of rotifers, are discussed . 219

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Section: Discussionsupporting

confidence: 79%

“…Recent studies of morphology, karyotype, genetics and reproductive behaviour of formerly called S-and L-type B . plicatilis showed that these types can be classified as different species (Fu et al, 1991 a ;Fu et al, 1991b ;Rumengan et al ., 1991 ;Hirayama & Rumengan, 1993 ;Segers, 1995) . It is evident that B .…”

Section: Introductionmentioning

confidence: 99%

Structural differences between the resting eggs of Brachionus plicatilis and Brachionus rotundiformis (Rotifers, Brachionidae): an electron microscopic study

et al. 1996

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“…In a second study, the same group clearly discriminated between L and S strains on a genetic basis and concluded that at least two species existed (Fu et al, 1991b). Additional evidence for the existence of at least two species within the taxon came from the examination of chromosomes: L and S morphotypes have karyotypes of 2n = 22 and 2n = 25, respectively (Rumengan et al, 1991(Rumengan et al, , 1993. The size discontinuities between L and S morphotypes were shown to correspond to behavioural reproductive isolation between these groups (Snell & Hawkinson, 1983).…”

Section: Introductionmentioning

confidence: 92%

Fifteen species in one: deciphering the Brachionus plicatilis species complex (Rotifera, Monogononta) through DNA taxonomy

et al. 2016

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Understanding patterns and processes in biological diversity is a critical task given current and rapid environmental change. Such knowledge is even more essential when the taxa under consideration are important ecological and evolutionary models. One of these cases is the monogonont rotifer cryptic species complex Brachionus plicatilis, which is by far the most extensively studied group of rotifers, is widely used in aquaculture, and is known to host a large amount of unresolved diversity. Here we collate a dataset of previously available and newly generated sequences of COI and ITS1 for 1273 isolates of the B. plicatilis complex and apply three approaches in DNA taxonomy (i.e. ABGD, PTP, and GMYC) to identify and provide support for the existence of 15 species within the complex. We used these results to explore phylogenetic signal in morphometric and ecological traits, and to understand correlation among the traits using phylogenetic comparative models. Our results support niche conservatism for some traits (e.g. body length) and phylogenetic plasticity for others (e.g. genome size).

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“…They all found strong reproductive isolation between the major clades, varying degrees of reproductive isolation among species within the same clade, and no intraspecific reproductive isolation, except for one case in which behavioral reproductive isolation was observed between two B. plicatilis strains (Berrieman et al, 2005). It has been suggested that reproductive isolation between B. plicatilis strains from different major clades might be caused by postzygotic reproductive isolation mechanisms such as different karyotypes (Rumengan et al, 1991).…”

Section: Introductionmentioning

confidence: 99%

“…Postzygotic mechanisms have been suggested as a likely mechanism for reproductive isolation between the more distantly related clades of the B. plicatilis complex (Rumengan et al, 1991;Fu et al, 1993). In our study, we tested for postzygotic reproductive barriers affecting the fitness of 'hybrid' offspring.…”

Section: Inheritance Of Genome Sizementioning

confidence: 99%

Do genome size differences within Brachionus asplanchnoidis (Rotifera, Monogononta) cause reproductive barriers among geographic populations?

et al. 2016

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Genome size in the rotifer Brachionus asplanchnoidis, which belongs to the B. plicatilis species complex, is greatly enlarged and extremely variable . Such variation raises the question whether large genome size differences among individuals might cause reproductive barriers, which could trigger speciation within this group by restricting gene flow across populations. To test this hypothesis, we used B. asplanchnoidis clones from three geographic populations and conducted assays to quantify reproductive isolation among clones differing in genome size, and we examined the population structure of all three populations using amplified fragment length polymorphisms (AFLPs). AFLPs indicated that these populations were genetically separated, but we also found hints of natural gene flow. Clones from different populations with genome size differences of up to 1.7-fold could interbred successfully in the laboratory and give rise to viable, fertile 'hybrid' offspring. Genome sizes of these 'hybrids' were intermediate between those of their parents, and fitness in terms of male production, population growth, and egg development time was not negatively affected. Thus, we found no evidence for reproductive isolation or nascent speciation within B. asplanchnoidis. Instead, our results suggest that gene flow within this species can occur despite a remarkably large range of genome sizes.

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Karyotypes of S and L type rotifers Brachionus plicatilis O.F. Müller

Cited by 39 publications

References 15 publications

Structural differences between the resting eggs of Brachionus plicatilis and Brachionus rotundiformis (Rotifers, Brachionidae): an electron microscopic study

Structural differences between the resting eggs of Brachionus plicatilis and Brachionus rotundiformis (Rotifers, Brachionidae): an electron microscopic study

Fifteen species in one: deciphering the Brachionus plicatilis species complex (Rotifera, Monogononta) through DNA taxonomy

Do genome size differences within Brachionus asplanchnoidis (Rotifera, Monogononta) cause reproductive barriers among geographic populations?

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