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JOURNAL OF PLANKTON RESEARCH | VOLUME 6 | NUMBER 6 | PAGES 967-983 | 1984
© Oxford University Press

research-article

Life-history analysis of an Artemia population in a changing environment

Petra H. Lenz1

Department of Biological Sciences, University of California Santa Barbara, CA 93106, USA

Received on February 1, 1983; accepted on July 1, 1984

The Anemia monica Verrill population in Mono Lake, California has two generations per year. Despite similarities in the year-to-year life history patterns, some important differences developed between 1979 and 1981. The first generation hatches from overwintering cysts in early spring and reaches maturity by the end of May. The first-generation females reproduce ovoviviparously, giving rise to a second generation which matures between mid-July and August. In July, both first and second generation females begin producing overwintering cysts. The population reaches it maximum in late summer, then declines to low numbers by November. The abundance of the first generation in June declined from a mean of 20 000 m–2 to 2400 m–2. Despite the smaller first generation, the second generation in 1980 and 1981 was at least as abundant as in 1979. These differences are indicative of a change in the Artemia population dynamics in Mono Lake.

1Address for correspondence: Hawaii Institute of Marine Biology, University of Hawaii, P.O. Box 1346 Kaneohe, HI 96744-1346, USA.


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