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Population dynamics of the solitary ascidian Herdmania momus (Savignyi, 1816) in Jeju Island, Korea

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Abstract

In 2007–2008, a population outbreak of the solitary ascidian Herdmania momus was observed along the coasts of Jeju Island and the ascidians became the top dominant species in macrobenthic communities. We conducted field experiments on population dynamics and demographic parameters including seasonal density fluctuation, vertical distribution, recruitment patterns, mortality, and growth rate. Recruitment continued year-round except in April following the lowest water temperature season in February. Population density was highest in August-October, concomitantly with the peak in recruitment, related to the highest water temperature. The lowest density was observed in February-April when the water temperature was lowest. In April all individuals disappeared from all permanent plots, resulting in a maximum life span of 10–12 months. Individuals of newly recruited H. momus grew to have an adult size of 4–6 cm in only 3–4 months. Higher densities were observed in the shallower areas (5 m) compared to the deeper zones. More recruitment occurred on vertical slopes than horizontal substrates, but substrate pre-occupancy caused no difference in recruitment. This is the first report on H. momus population-level investigation in Korea, which provides valuable baseline information on the current status of population demography and their potential community-level influence on Jeju coasts.

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Correspondence to Jeong Ha Kim.

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Yi, C.H., Kim, J.H. Population dynamics of the solitary ascidian Herdmania momus (Savignyi, 1816) in Jeju Island, Korea. Ocean Sci. J. 51, 363–371 (2016). https://doi.org/10.1007/s12601-016-0032-x

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  • DOI: https://doi.org/10.1007/s12601-016-0032-x

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