Abundance and distribution of Nemopilema nomurai (Scyphozoa, Rhizostomeae), in Korean waters in 2005-2013

作者：Yoon Won Duk^*; Lee Hye Eun; Han Changhoon; Chang Soo Jung; Lee Kyunghoon

来源：Ocean Science Journal, 2014, 49(3): 183-192.

DOI：10.1007/s12601-014-0018-5

• Nemopilema nomurai
• Korean waters
• distribution
• abundance
• monitoring

Nemopilema nomurai have appeared massively since 2003 in Korean waters, and regular offshore monitoring has been performed since 2005 in the eastern Yellow Sea (YS), northwestern East China Sea (ECS), Korean southern waters (Ksw), and western East Sea (ES). Korea Jellyfish Monitoring Network (KoJEM) was established in 2006 for coastal jellyfish monitoring. From these, sight survey monitoring data were gathered and analyzed to extract the yearly and seasonal fluctuation of N. nomurai's abundance and distribution. The first massive annual appearance of N. nomurai occurred in the northwestern ECS, off Shanghai, China, in mid May of 2005-2008 and of 2012-2013. In other years or concurrently with the appearance in the northwestern ECS in the same year, several individuals were found in the mid-eastern YS and Ksw, and southwestern ES. The population of N. nomurai at the northwestern ECS moved to the southeastern YS and Jeju Strait in June, and from the July to August it extended its distribution all around the Korean peninsula and persisted till October. Since October, the distribution was retracted into the southern YS and Ksw, and disappeared slowly. N. nomurai's yearly abundance varied a lot, from nearly 0 inds 10(-4)m(-2) in 2010 to 62.4 inds 10(-4)m(-2) in 2005. The highest abundance was recorded in 2005, followed by 2007 and 2009, and the least abundance was in 2008 and 2010-2013. The results were compared with those of the Liaoning Bay, Bohai Sea, which led to speculation about a new seeding place of N. nomurai, and mortality during the early planktonic phase of N. nomurai was proposed as the determinant of the yearly variation in abundance.

• 出版日期2014-9