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Temporal fluctuation in the abundance of a semelid bivalve, Theora fragilis (A. Adams) in Maizuru Bay, Sea of Japan
Saito, H.; Ueno, M.; Hayashi, I. (1998). Temporal fluctuation in the abundance of a semelid bivalve, Theora fragilis (A. Adams) in Maizuru Bay, Sea of Japan. Hydrobiologia 375-376: 151-163
In: Hydrobiologia. Springer: The Hague. ISSN 0018-8158, more
Peer reviewed article  

Also published as
  • Saito, H.; Ueno, M.; Hayashi, I. (1998). Temporal fluctuation in the abundance of a semelid bivalve, Theora fragilis (A. Adams) in Maizuru Bay, Sea of Japan, in: Baden, S. et al. (Ed.) Recruitment, Colonization, and Physical-Chemical Forcing in Marine Biological Systems: Proceedings of the 32nd European Marine Biology Symposium, held in Lysekil, Sweden, 16-22 August 1997. Developments in Hydrobiology, 132: pp. 151-163, more

Available in  Authors 
Document type: Conference paper

Keywords
    Fecundity; Nutritional requirements; Population density; Population dynamics; Recruitment; Theora lata (Hinds, 1843) [WoRMS]; Japan, Honshu, Kyoto Prefect., Maizuru

Authors  Top 
  • Saito, H.
  • Ueno, M.
  • Hayashi, I.

Abstract
    The population dynamics of a semelid bivalve Theora fragilis (A. Adams) were studied in Maizuru Bay, the Sea of Japan based on data obtained through weekly or bi-weekly sampling. A sharp increase in population abundance occurred from early February to early April. However, the benthic population had almost disappeared leaving only sporadic survivors by early August. Comparison of average growth between the central and the innermost stations showed that many juveniles recruited into adult size at the latter station, where high sedimentation of particulate organic matter (POM) was observed. At the central station, the mean POM sedimentation rate was 1/3 that of the former station, and few individuals recruited into adult size. The occurrence of small juveniles was comparable at both sites. It was concluded that nutritional input is important for both recruitment into adult size and resulting fecundity.

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