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Growth of the intertidal snail, Monodonta labio (Gastropoda, Prosobranchia) on the Pacific coast of central Japan
Iijima, A. (2001). Growth of the intertidal snail, Monodonta labio (Gastropoda, Prosobranchia) on the Pacific coast of central Japan. Bull. Mar. Sci. 68(1): 27-36
In: Bulletin of Marine Science. University of Miami Press: Coral Gables. ISSN 0007-4977, more
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    Marine

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  • Iijima, A.

Abstract
    Growth of the trochid snail Monodonta labio was investigated by individual marking on a Pacific coast rocky shore of Honshu, central Japan, Growth rates of small sized M. labio were greater during summer to fall than during winter, However, the growth of large sized M. labio did not fluctuate all year round. Estimated growth curves were gained from growth data of monthly recaptured M. labio. From the estimated growth curves it was showed that newly recruited M. labio (1.6 mm in shell height) grew 10.3 mm at 1 yr after recruitment, 16.7 mm after 2 yrs, 20.2 mm after 3 yrs, 22.6 mm after 4 yrs, 24.4 mm after 5 yrs and reached the maximum size at the study shore of 25.0 mm after 5 yrs 2 mo. Monodonta labio is a common trochid snail which inhabits rocky-boulder or boulder shores of Japan, Korea and the southern part of China. Growth of M. labio have been studied in Hakata (Sumikawa, 1955) and in Shima Peninsula (Nakano and Nagoshi, 1981, 1984) in Japan (Fig. 1) by using cohort analysis. Although cohort analysis is a convenient method to study about growth, overlap of different cohorts in frequency histograms make it difficult to monitor the growth of each cohort especially in the older age classes (Nakaoka, 1992). Furthermore, growth of each individual can not be followed by this method. The mark-recapture method is reliable to estimate molluscan growth (Hughes and Roberts, 1980; Phillips, 1981; Wada et al., 1983; Fletcher, 1984; Chow, 1987; Katoh, 1989; Bowling, 1994). Takada (1995) shows the growth pattern of M. labio by mark-recapture at a boulder shore in Amakusa (Fig. 1), but variation of the growth rate among individuals was not clear in this study because the recapture rates were low (highest is 4.3% during 2 mo), In contrast, recapture rates of M. labio in Kominato (Fig. 1) were high (12.0-67.4 % during 1 mo )(Iijima and Furota, 1996). In the present study, I analyzed the growth rate of individuals of M. labio by the mark-recapture method in Kominato and (1) growth curve of this species is proposed and compared with previous results, and (2) the variation of individual growth is analyzed.

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