Abstract
Monodonta labio (Gastropoda: Trochidae) occurs in a wide tidal zone on a boulder-covered shore in Amakusa, Japan. To investigate sources of variation in reproductive output within a population, the fecundity ofM. labio was estimated. Regressions of gonad egg counts on shell width were calculated from samples collected bi-weekly at three tidal zones: high, mid and low intertidal. Seasonal fluctuations in the regression revealed that individual females spawn at least three times a year. Variation in fecundity between the three tidal zones was not detected at any time in standard 12 mm snails. Due to the high growth rate in the low zone during the reproductive season, annual fecundity in the low zone was larger than that in the high and mid zones. Thus, tidal zone variation in fecundity ofM. labio was a result of growth variation between tidal zones.
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Takada, Y. Vertical variation in fecundity of the intertidal gastropodMonodonta labio caused by different growth rates between tidal zones. Ecol. Res. 11, 371–379 (1996). https://doi.org/10.1007/BF02347794
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DOI: https://doi.org/10.1007/BF02347794