𝔖 Bobbio Scriptorium
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Algal toxins—Initiators of avian botulism?

✍ Scribed by Tom Murphy; Annette Lawson; Czesia Nalewajko; Henry Murkin; Lisette Ross; Keiji Oguma; Terry McIntyre

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
201 KB
Volume
15
Category
Article
ISSN
1520-4081

No coin nor oath required. For personal study only.

✦ Synopsis

An outbreak of avian botulism in Whitewater Lake, Manitoba, Canada was associated with reducing sediments. But any linkage between sediments and botulism was only indirect; Clostridium botulinum was not observed in the sediments. The source of the C. botulinum was unclear but carcasses that overwintered appeared to perpetuate the outbreak. The algal toxins anatoxin-a and ( ) microcystin-LR were present 17 ( mg/ L when many birds were moulting and unable to fly, likely making them more sensitive to botulism. The sediment anoxia released phosphorus into lakewater so that concentrations increased from about 73 to 470 mg/ L and enhanced growth of Microcystis and Aphanizomenon. Wind resuspension of sediments resulted in areas with more algal biomass and associated algal toxins.

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