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Size and reproduction in Daphnia magna (Crustacea: Cladocera)
Author(s) -
Green J.
Publication year - 1954
Publication title -
proceedings of the zoological society of london
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.915
H-Index - 96
eISSN - 1469-7998
pISSN - 0370-2774
DOI - 10.1111/j.1469-7998.1954.tb07796.x
Subject(s) - parthenogenesis , cladocera , brood , branchiopoda , biology , daphnia magna , daphnia , instar , reproduction , crustacean , zoology , ecology , longevity , larva , fishery , chemistry , toxicity , embryo , genetics , organic chemistry
S ummary.1 In natural populations parthenogenetic egg production in Daphnia magna Straus is directly related to size. 2 Previous workers have shown that the number of parthenogenetic eggs produced during the life of a female increases in the early broods and decreases in later broods. 3 Egg production and size are positively correlated in the first adult instar, both under constant conditions and with varying food. 4 The size of the young liberated varies with maternal age, the third brood consisting of young of a larger average size than earlier or later broods. 5 The initial size of the young liberated influences the instar in which maturity is reached. 6 The probable effects of maternal age on growth, maturation and longevity of the young are discussed.