Role of the nutritive value of sediment in regulating population dynamics of the deposit-feeding polychaete Streblospio shrubsolii
作者： Rossi F. , Lardicci C.
DOI: 10.1007/S00227-001-0768-3
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摘要: The importance of changes in nutritive value the sediment regulating dynamics small deposit-feeding polychaete Streblospio shrubsolii (Buchanam, 1890) was examined. First, fluctuations population S. and content were studied on a seasonal scale. Subsequently, manipulative field experiment used to test hypothesis that, summer, availability food regulates aspects shrubsolii. In summer 1997, sharp increases protein concentrations number individuals found com- pared all other seasons. Densities also showed an increase subsequent season. Newly recruited juveniles (19-31 setigers) abundant autumn whereas (32-42 increased 1997. Large numbers adults Significant negative correlations occurred 1997 between proteins total individuals, newly density adults. No differ- ences densities juveniles, or among plots before starting experiment. After 20 days experimental enrichment, tendency increase. 40 signif- icantly greater enriched plots. larvae postlarval corroborated model that growth limited by summer. Thus, this season, patches could have fundamental role de- termining deposit- feeders under natural conditions over short time scales.
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