Reproductive effort, fecundity and energy allocation inMarphysa sanguinea(Polychaeta: Eunicidae)
作者:
CARLOTTA CASSAI,
DANIELA PREVEDELLI,
期刊:
Invertebrate Reproduction & Development
(Taylor Available online 1998)
卷期:
Volume 34,
issue 2-3
页码: 133-138
ISSN:0792-4259
年代: 1998
DOI:10.1080/07924259.1998.9652645
出版商: Taylor & Francis Group
关键词: Polychaeta;Marphysa sanguinea;reproductive effort;fecundity;energy allocation;reproductive strategy
数据来源: Taylor
摘要:
Reproductive effort in terms of fecundity and energy allocation was studied in the iteroparous and long lived polychaeteMarphysa sanguinea.Both measures show great variability. Fecundity varied from 8500 to 24300 oocytes; no linear relationship was found between oocyte number and jaw length whereas a direct relationship was established between oocyte number and wet body weight. The energy content of germinal and somatic tissues was determined by differential scanning calorimeter (DSC). The reproductive effort for a single reproductive event was calculated according to the formula: RE = EG/(EG+ ES) where EGis the total energy of the germinal tissues and ESis the total energy of the somatic tissues. The lack of correlation between reproductive effort and size index strongly suggests that reproductive allocation does not increase with age. The reproductive effort ranged from 0.04 to 0.19 with a mean value of 0.120.
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