WINTER FLOUNDER PSEUDOPLEURONECTES-AMERICANUS REPRODUCTIVE SUCCESS .2. EFFECTS OF SPAWNING TIME AND FEMALE SIZE ON SIZE, COMPOSITION AND VIABILITY OF EGGS AND LARVAE

被引:95
作者
BUCKLEY, LJ
SMIGIELSKI, AS
HALAVIK, TA
CALDARONE, EM
BURNS, BR
LAURENCE, GC
机构
关键词
D O I
10.3354/meps074125
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
Vital statistics and embryo and larval viability were determined for winter flounder Pseudopleuronectes americanus spawning in Narragansett Bay, Rhode Island, USA, over the course of the spawning season. Fish approaching spawning condition were collected throughout the spawning season and hand-stripped in the laboratory. Larvae were reared through the first month of life. Female size affected most of the reproductive parameters examined, including both absolute and relative measures of total reproductive output (reproductive rate and gonadosomatic index), egg size, fecundity, and viability. Spawning time was found to affect egg size, fecundity, and viability, but not reproductive rate or gonadosomatic index. Egg size increased with increasing female size and decreased as the spawning season progressed. Spawning time and female size explained 61% of the observed variability in egg size among females. Female size explained 95% of the variability in reproductive rate and 90% of the variability in fecundity. Female size and spawning time combined explained 94% of the variability in fecundity. The effects of female size and spawning time on both fertility and hatch rate were non-additive. Embryos produced earlier in the spawning season appeared to have a survival advantage over those produced later in the spawning season. Embryos produced by small, late-spawning fish appeared to be at a pronounced disadvantage.
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页码:125 / 135
页数:11
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