PMID: 9183706May 1, 1997Paper

Trophic controls on stage transformations of a toxic ambush-predator dinoflagellate

The Journal of Eukaryotic Microbiology
Joann M Burkholder, H B Glasgow

Abstract

The toxic dinoflagellate, Pfiesteria piscicida, was recently implicated as the causative agent for about 50% of the major fish kills occurring over a three-year period in the Albemarle-Pamlico Estuarine System of the southeastern USA. Transformations between life-history stages of this dinoflagellate are controlled by the availability of fresh fish secretions or fish tissues, and secondarily influenced by the availability of alternate prey including bacteria, algae, microtauna, and mammalian tissues. Toxic zoospores of P. piscicida subdue fish by excreting lethal neurotoxins that narcotize the prey, disrupt its osmoregulatory system, and attack its nervous system. While prey are dying, the zoospores feed upon bits of fish tissue and complete the sexual phase of the dinoflagellate life cycle. Other stages in the complex life cycle of P. piscicida include cryptic forms of filose, rhizopodial, and lobose amoebae that can form within minutes from toxic zoospores, gametes, or planozygotes. These cryptic amoebae feed upon fish carcasses and other prey and, thus far, have proven less vulnerable to microbial predators than flagellated life-history stages. Lobose amoebae that develop from toxic zoospores and planozygotes during colder p...Continue Reading

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Citations

Feb 5, 2004·Current Treatment Options in Neurology·Michael R. Watters, Elijah W. Stommel
Mar 22, 2003·Research in Microbiology·Todd R Miller, Robert Belas
Jan 11, 2005·Applied and Environmental Microbiology·Tomás DrgonGerardo R Vasta
Oct 6, 2005·Applied and Environmental Microbiology·Andrew S GordonParke A Rublee
Jun 8, 2007·The Journal of Eukaryotic Microbiology·Hae Jin JeongWon Ho Yih
Feb 9, 2000·Environmental Research·E K SilbergeldJ G Morris
Oct 21, 1999·Toxicologic Pathology·L E FlemingB Levin
Jul 27, 2001·Environmental Microbiology·M AlaviR Belas
Mar 1, 2000·Journal of Aquatic Animal Health·Michael J Dykstra, Andrew S Kane
Mar 4, 2000·Environmental Health Perspectives·F M Van Dolah
Nov 13, 2004·The Journal of Eukaryotic Microbiology·Michael T PeglarPatrick M Gillevet

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