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Sexual swarms in Daphnia magna, a cyclic parthenogen
Author(s) -
YOUNG J. P. W.
Publication year - 1978
Publication title -
freshwater biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.297
H-Index - 156
eISSN - 1365-2427
pISSN - 0046-5070
DOI - 10.1111/j.1365-2427.1978.tb01448.x
Subject(s) - daphnia magna , cladocera , biology , branchiopoda , crustacean , zoology , swarm behaviour , daphnia , population , ecology , zooplankton , demography , chemistry , toxicity , sociology , organic chemistry
SUMMARY. Dense swarms were observed in a population of Daphnia magna (Crustacea: Cladocera). The swarms appeared during a sexual period in which females were abundant but males were rare. Each swarm contained several males and large numbers of ‘imminently sexual’ females, a class of females that was rare except in the swarms. This implies that both sexes respond to attractant stimuli, and that the female response occurs only during a brief critical phase in the ovarian cycle.