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Effects of Juvenile Hormone and Precocene on the Reproduction of Brachionus calyciflorus
Author(s) -
Lv Linlan,
Jiang Qichen,
Chen Xuejiao,
Yang Jiaxin
Publication year - 2012
Publication title -
international review of hydrobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.524
H-Index - 52
eISSN - 1522-2632
pISSN - 1434-2944
DOI - 10.1002/iroh.201101499
Subject(s) - brachionus calyciflorus , rotifer , juvenile hormone , hatching , juvenile , reproduction , biology , population , brachionus , zoology , hormone , medicine , endocrinology , larva , ecology , environmental health
We studied the effects of juvenile hormone and precocene on reproduction of the rotifer Brachionus calyciflorus . Amictic females of B. calyciflorus that were 2‐4 hours old were exposed to different concentrations of juvenile hormone (0.004, 0.02, 0.1, 0.5, 2.5, 12.5 mg/L) and/or precocene (0.05, 0.25, 0.75, 3.75, 7.5 mg/L) for 24 h. They were then transferred to a new medium without hormone and checked every 2 h during the next 48 h, and thereafter monitored daily until the individual died. Precocene had no effects on the length of the rotifer juvenile period, hatching time of the first neonate, lifetime reproduction, or the mixis ratio. In contrast, juvenile hormone at 0.5, 2.5, and 12.5 mg/L significantly prolonged the juvenile period by 6.1, 9.2, and 8.6%, respectively. When 26‐28‐h‐old amictic females were exposed to the same concentration series of juvenile hormone or precocene, precocene at 3.75 mg/L resulted in an increase in lifetime reproduction of 30.39%. However, at 0.75 and 3.75 mg/L precocene, a significantly lower percentage of mictic females was found, whereas juvenile hormone had no effect on the lifetime reproduction or mixis ratio. The population growth test showed that juvenile hormone had significant effects on the population growth rate and mixis ratio, but no effect on resting egg production. In comparison, precocene had no effect on any of these parameters. (© 2012 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)