Energy Budgets in the Neptune Whelk Neptunea arthritica Population in Usu Cove, Funka Bay, Hokkaido

DOI Web Site 被引用文献1件 参考文献32件

この論文をさがす

抄録

Abstract: Energy budgets in Neptunea arthritica, a species with significantly different proportions of assimilated energy directed to reproduction in males and females, were estimated based on sex ratio(male: female), assimilated energy and energy allocation in each age class, and seasonal changes in density. The sex ratio changed with every sample, but the energy budgets in year-classes were framed using the interpolated mean ratio of0.95during the period of density measurements. The several observed energy budget patterns in the neptune whelk very nearly corresponded to the growth stages of hatchling, immature, and adult. The biomass in the hatchling fraction of the population did not increase very much regardless of relatively high assimilation at that stage, because of the rather heavy mortality as compared with recruitment. In contrast, in the immature fraction, final biomass increased considerably as compared with the initial state, as the result of high assimilation and growth with little mortality. Finally, in the adult fraction, biomass substantially decreased from the initial to final state due to assimilation only roughly equalling initial biomass, or falling short of doing so, thus resulting in little or no growth, and to mortality being roughly equal to or exceeding assimilation. The turnover ratio of the neptune whelk population in the investigation period showed a very low value of0.42, reflecting a drastic mortality in the older adult population. The energy budget patterns in the three growth stages and the migration pattern in immatures suggest that construction of a nursery ground for immature individuals should be a very important consid eration in efforts to propagate the neptune whelk.

収録刊行物

  • BENTHOS RESEARCH

    BENTHOS RESEARCH 56 (1), 33-42, 2001

    日本ベントス学会

被引用文献 (1)*注記

もっと見る

参考文献 (32)*注記

もっと見る

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ