Biology:Pfiesteria shumwayae
| Pseudopfiesteria shumwayae | |
|---|---|
| |
| Pseudopfiesteria shumwayae SEM micrograph | |
| Scientific classification | |
| Domain: | Eukarya
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| (unranked): | |
| Phylum: | |
| Class: | |
| Order: | Phytodiniales
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| Family: | Pfiesteriaceae
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| Genus: | Pseudopfiesteria
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| Species: | P. shumwayae
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| Binomial name | |
| Pseudopfiesteria shumwayae Glasgow & Burkholder
| |
Pseudopfiesteria shumwayae (formerly placed in the genus Pfiesteria; see 'Taxonomy' section below) is a species of heterotrophic dinoflagellates in the genus Pseudopfiesteria. It was first characterized in North Carolina in 2000.[1] It can acquire the ability for photosynthesis through eating green algae and retaining their chloroplasts. It can also turn predatory and toxic. Strains of Pseudopfiesteria shumwayae have been implicated in fish kills around the US east coast. Pseudopfiesteria shumwayae has been described as having a less complex life cycle than Pfiesteria piscicida.[2]
Toxicity
While toxic strains of Pseudopfiesteria shumwayae have been implicated in fish kills, its ability to secrete an exotoxin to kill its prey has been subject to controversy.[3] A study published in 2002 has shown that it is capable of killing fish by direct contact and feeding on their skin through micropredation.[4] Toxicity levels appear to depend on the strains and assays used in the laboratory.[5] Pfiesteria shumwayae toxin present in filtered water can cause cognitive deficits in rats.[6]
Taxonomy
Based on 2005 research, the organism previously known as Pfiesteria shumwayae should be reassigned its own genus, based on both morphological analysis and molecular evidence as supported by rDNA analysis. Although closely resembling Pfiesteria piscicida, it differs in two important precingular plates 5" and 6", which historically, only one plate difference would be sufficient to place in a separate genus. The species ' shumwayae ' has thus been categorized in a more recently erected genus, Pseudopfiesteria.[7]
Occurrence
Pfiesteria has a worldwide distribution and is typically found in estuaries and coastal habitats. It is usually benign unless it "blooms" to a high concentration. High concentrations of Pseudopfiesteria shumwayae have been found in the following locations:
- Taskinas Creek, a tributary of the York River in James City County, Virginia, in March 2005.[8]
References
- ↑ "NC State News Release, March 10, 2000: NC State Scientists Confirm Second Toxic Pfiesteria Species". http://www.ncsu.edu/ncsu/univ_relations/news_services/press_releases/00_03/60.htm.
- ↑ "Species of the toxic Pfiesteria complex, and the importance of functional type in data interpretation". Environ. Health Perspect. (Environmental Health Perspectives, Vol. 109) 109 Suppl 5: 667–79. 2001. doi:10.2307/3454912. PMID 11677174.
- ↑ "Pfiesteria piscicida, P. shumwayae, and other Pfiesteria-like dinoflagellates". Res. Microbiol. 154 (2): 85–90. 2003. doi:10.1016/S0923-2508(03)00027-5. PMID 12648722.
- ↑ "Pfiesteria shumwayae kills fish by micropredation not exotoxin secretion". Nature 418 (6901): 967–70. 2002. doi:10.1038/nature01008. PMID 12198545.
- ↑ "Demonstration of toxicity to fish and to mammalian cells by Pfiesteria species: comparison of assay methods and strains". Proc. Natl. Acad. Sci. U.S.A. 102 (9): 3471–6. 2005. doi:10.1073/pnas.0500168102. PMID 15728353.
- ↑ "Behavioral effects and drug vulnerability in rats exposed to Pfiesteria toxin". Neurotoxicol Teratol 27 (5): 701–10. 2005. doi:10.1016/j.ntt.2005.06.008. PMID 16198085.
- ↑ http://www.vims.edu/~jeff/biology/pseudopfiesteria.pdf
- ↑ "Chesapeake Bay Foundation - Save the Bay: High Concentrations of Pfiesteria Underscore Need to Reduce Pollution". http://www.cbf.org/site/News2?JServSessionIdr001=a5wpva5ly1.app26a&page=NewsArticle&id=10617&security=1&news_iv_ctrl=1081.
Wikidata ☰ Q2083786 entry
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