Top Qs
Timeline
Chat
Perspective
Brachionus plicatilis
Species of rotifer From Wikipedia, the free encyclopedia
Remove ads
Brachionus plicatilis is a euryhaline (tolerate a wide range of salinity) rotifer in the family Brachionidae, and is possibly the only commercially important rotifer, being raised in the aquaculture industry as food for fish larvae. It has a broad distribution in salt lakes around the world and has become a model system for studies in ecology and evolution.
Remove ads
Reproduction
Brachionus species can normally reproduce asexually and sexually (cyclical parthenogenesis). Sexual reproduction (termed Mixis) is usually induced when population density increases. Mixis in Brachionus plicatilis has been shown to be induced by a density-dependent chemical cue.[1]
Genome size
Haploid '1C' genome sizes in the Brachionus plicatilis species complex range at least from 0.056 to 0.416 pg.[2]
The complete mitochondrial genome of B. plicatilis sensu stricto NH1L has been sequenced.[3]
Cryptic species complex
Summarize
Perspective
Brachionus plicatilis strains have long been divided into ‘L-’ and ‘S-type’ forms. However, studies on morphology, karyotype, genetics and reproductive behaviour revealed that these types seem to be different species (B. plicatilis and B. rotundiformis).
DNA sequencing studies in 2002 revealed Brachionus plicatilis to be a cryptic species complex comprising approximately 10 separate species, each of which has been diverging for several million years.[4] A recent study identified 22 potential different species within the Plicatilis species complex.[5]
The species, rather than the complex, is now usually referred to as Brachionus plicatilis s. s. (sensu stricto).
The species complex can be divided into 3 major clades (clade L = larger body and genome sizes e.g. B. plicatilis s.s., clade SM = medium body and genome sizes e.g. B. 'Almenara', clade SS = small body and genome size e.g. B. rotundiformis).
http://www.biomedcentral.com/1471-2148/11/90/figure/F1
- List of the 22 suspected species of the B. plicatilis cryptic species complex
Species names and clade in () [6][7]
- * B01: B. 'Tiscar', S.? (B)
- * B02: unnamed, S. 6 (B)
- * B03: B. 'Persia', S. ? (B)
- * B04: B. 'Harvey', S. 14 (B)
- * B05: B. ibericus, S. 10 (B)
- * B06: B. Almenara (or MEG-2012), S. 9 (B)
- * B07: B. 'Towerinniensis, S. 7 (B)
- * B08: B. 'Coyrecupiensis', S. 8 (B)
- * B09: B. 'Cayman' (or B. koreanus), S. 5 (B)
- * B10: B. 'Cayman' (or B. koreanus), S. 5 (B)
- * B11: B. 'Austria', S. 4 (A)
- * B12: B. Nevada, S. 3 (A)
- * B13: B. Nevada, S. 3 (A)
- * B14: B. Nevada, S. 3 (A)
- * B15: B. plicatilis s.s., S. 1 (A)
- * B16: B. manjavacas, S. 2 (A)
- * B17: unnamed, S. 12 (C)
- * B18: unnamed, S. 12 (C)
- * B19: unnamed, S. 12 (C)
- * B20: B. rotundiformis, S. 11 (C)
- * B21: unnamed, S. ? (C)
- * B22: B. 'Lost', S. 13 (C)
References
Wikiwand - on
Seamless Wikipedia browsing. On steroids.
Remove ads