Korean Journal of Environmental Biology (환경생물)

Korean Society of Environmental Biology (한국환경생물학회)
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Effects of temperature and salinity on egg development and larval settlement of an invasive ascidian species, Herdmania momus (Savigny, 1816)

  • Park, Juun (Institute of Marine Life Resources, Sahmyook University) ;
  • Lee, Yun-Sik (Institute of Marine Life Resources, Sahmyook University) ;
  • Kim, Donghyun (Institute of Marine Life Resources, Sahmyook University) ;
  • Shin, Sook (Institute of Marine Life Resources, Sahmyook University)
  • Received : 2020.11.05
  • Accepted : 2020.12.08
  • Published : 2020.12.31
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Abstract

The effects of temperature and salinity on egg development and settlement of the ascidian Herdmania momus were investigated. Adult specimens were collected from the Dodu Yacht facility in Jeju Island, Korea(33°30'30.54"N, 126°27'55.46"E) in August 2018. Egg development and larval settlement were observed and recorded at 8 h intervals using a stereomicroscope, under nine temperature (10, 13, 16, 19, 22, 25, 28, 31, and 34℃), and four salinity regimens (28, 30, 32, and 34 psu). The highest hatching rate (82.8±7%) was observed at 32 psu and 25℃ and the lowest hatching rate (1.0±2%) was at 34 psu and 13℃. The developmental rate (0.222±0.0994) was highest at 28 psu and 28℃, and lowest (0.016±0.008) at 30 psu and 13℃. The highest settlement success rate (77.1±5%) was at 32psu and 25℃ and the lowest(0.1±1.0%) was at 30psu, and 13℃. The rate of settlement(0.080±0.000) was highest at 28psu and 28℃, and lowest(0.013±0.000) at 30psu and 13℃. Both hatching and settlement success rates increased as temperature increased and tended to decrease beyond an optimal temperature range. Herdmania momus preferred 30-34 psu salinity and 22-25℃ temperature. This study provides baseline information about the life history of H. momus, and important data to control the damage caused by the increase in number and distribution of this invasive ascidian.

Keywords

Acknowledgement

The authors are grateful to Dr. Tae Jung Yoon and Dr. Dong Gun Kim for their comments on this study. This research was a part of a project titled 'Improvement of management strategies on marine disturbing and harmful organisms' funded by the Ministry of Oceans and Fisheries, Korea (No. 20190518).

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