Results of zinc deprivation in daphnid culture

Autor: Paula B. Caffrey, Kathleen Irwin Keating
Rok vydání: 1997
Předmět:
Zdroj: Environmental Toxicology and Chemistry. 16:572-575
ISSN: 1552-8618
0730-7268
DOI: 10.1002/etc.5620160325
Popis: Daphnia pulex Leydig (Cladocera), reared in circumstances of strictly controlled trace element exposure, were deprived of zinc. When zinc was withheld from both their liquid medium and solid (algal) food, D. pulex survived for more than 20 consecutive generations before the line ceased reproduction entirely. Through these generations zinc deprivation resulted in a somewhat irregular, but continuing, shortening of life span, a decrease in fecundity (both progeny per brood and number of broods were affected), and a loss of cuticle integrity. A distinct pattern of response was observed during the gradual, multigenerational decline of the animal line. The decline can be separated into three stages: initial (first five), minimal, but steady, increase in overt damage; intermediate (sixth through 19th), varying degrees of damage with apparent severity showing a distinct alternation from generation to generation; and final (last three generations), limited reproduction with ultimate elimination of the animal line by a total absence of reproduction in generation 23.
Databáze: OpenAIRE
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