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Brachionus

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Title: Brachionus  
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Subject: Asexual reproduction, Rotifer, Lake Bogoria, Lake Nakuru, Tetraselmis suecica, Traumatic insemination, Brachionus plicatilis
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Brachionus

Brachionus
Brachionus calyciflorus
Scientific classification
Kingdom: Animalia
Phylum: Rotifera
Class: Monogononta
Order: Plioma
Family: Brachionidae
Genus: Brachionus
Pallas, 1766
Species

about 30 [1]

Brachionus is a genus of planktonic rotifers occurring in freshwater, alkaline and brackish water.

Species

e.g. Brachionus calyciflorus, Brachionus plicatilis s.s., Brachionus ibericus, Brachionus rotundiformis, Brachionus manjavacas, Brachionus sp. Austria, Brachionus sp. Almenara, Brachionus sp. Tiscar, Brachionus urceolaris, Brachionus sp. Cayman, Brachionus quadridentatus, Brachionus dimidiatus, Brachionus patulus, Brachionus sp. Nevada, Brachionus rubens, Brachionus falcatus, Brachionus havanaensis, Brachionus angularis, Brachionus diversicornis, Brachionus forficula, Brachionus dimidiatus, Brachionus macracanthus, Brachionus caudatus, Brachionus bidentata, Brachionus leydigi

Use

Rotifers such as Brachionus calyciflorus are favored test animals in aquatic toxicology because of their sensitivity to most toxicants. They also are used as model organisms in various other biological fields e.g. due to their interesting reproductive mode in evolutionary ecology. Brachionus spp. are easily reared in large numbers and because of this are used to substitute for wild zooplankton for feeding hatchery reared larval fish. However, the composition of rotifers generally does not satisfy the nutritional requirements of fish larvae,[2] and large amounts of research has been invested in improving the lipid, vitamin and mineral composition of rotifers to better meet the requirements of fish larvae[3][4][5]

Reproduction

Brachionus species can normally reproduce asexually and sexually (cyclical parthenogenesis). Sexual reproduction is usually induced when population density increases. Transitions to obligate parthenogenesis have been described in Brachionus calyciflorus. In this species, obligate parthenogenesis can be inherited by a recessive allele, which leads to loss of sexual reproduction in homozygous offspring.[6]

Genome size

Haploid '1C' genome sizes in Brachionus species range at least from 0.056 to 0.416 pg.[7]

Genome sequencing

The complete mitochondrial genome of B. plicatilis sensu strictu NH1L has been sequenced.[8]

Cryptic species

Brachionus plicatilis has been demonstrated to be a large cryptic species complex[9] and it is likely that the number of species present in this genus greatly exceeds those currently described.

References

Huang, L. "Effectof Aldrin on Life History Characteristics of Rotifer Brachionus calyciflorus Pallas." Bull Environ Contam Toxicol no5 N 2007


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