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Spatial and seasonal variation in growth rate and secondary production of Yoldia notabilis in Otsuchi Bay, Japan, with reference to the influence of food supply from the water column
Nakaoka, M. (1992). Spatial and seasonal variation in growth rate and secondary production of Yoldia notabilis in Otsuchi Bay, Japan, with reference to the influence of food supply from the water column. Mar. Ecol. Prog. Ser. 88(2-3): 215-223
In: Marine Ecology Progress Series. Inter-Research: Oldendorf/Luhe. ISSN 0171-8630, more
Peer reviewed article  

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Keywords
    Correlation analysis; Food availability; Growth; Marine molluscs; Organic matter; Primary production; Seasonal variations; Secondary production; Spatial variations; Yoldia notabilis Yokoyama, 1922 [WoRMS]; Marine

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  • Nakaoka, M.

Abstract
    A 1 yr field study of a long-lived protobranch bivalve, Yoldia notabilis, in Otsuchi Bay, northeastern Japan, revealed that there was a large seasonal and spatial variation in growth rate and secondary production, and that primary production in the water column and following organic supply to the bottom were responsible for the variation. Both shell and soft tissue growth of each of 9 year-classes were rapid in spring, and slow or even negative in other seasons. The rapid growth coincided well with the occurrence of spring phytoplankton bloom in the water column and the peak of organic flux to the bottom. Mean shell length and mean soft tissue weight of each year-class were larger, and the growth rates of shell and soft tissue as well as the secondary production were higher at the shallower station (10 m deep) than at the deeper station (14 m). The differences in size, growth rate and production between the 2 stations were consistent with the local differences in food supply from the water column to the bottom, but not related to other environmental factors such as temperature, salinity, organic content in the sediment and density of Y. notabilis.

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