Diel Horizontal Migration of the Two Mysids Archaeomysis kokuboi and Acanthomysis sp. in the Sandy Shore Surf Zone of Yongil Bay, Eastern Korea

동해 영일만의 모래해변 쇄파대에 사는 곤쟁이류 Archaeomysis kokuboi와 Acanthomysis sp. 두 종의 주야 수평이동

  • Suh, Hae-Lip (Department of Oceanography, Chonnam National University) ;
  • Jo, Soo-Gun (Department of Living Marine Resources, Kunsan National University) ;
  • Kim, Kwang-Young (Department of Oceanography, Chonnam National University)
  • Published : 1995.12.30

Abstract

The mysids, Archaeomysis kokuboi and Acanthomysis sp., clearly exhibited the diel patterns of interspecific horizontal migration in the surf zone at a sandy shore in Yongil Bay, eastern Korea. Shoreward migration of Acanthomysis sp. at sunset resulted in the presence of significantly high numbers of mysids after dark at the bottom of 1 m depth. At first light, Acanthomysis sp. moved back to deeper water of>1 m depth in conjunction with a reverse migration by A. kokuboi. In the afternoon, A. kokuboi moved to offshore, then these species remained there. Although A. kokuboi has been considered an intertidal species in the exposed beaches with strong wave action, this is not the case in a sandy beach of Yongil Bay. We suggest that evidence for behavioral adaptation comes from the response of k. kokuboi to the sheltered beaches with weak wave action. The habitat shifts presumably provide this species with high availability of food materials in the surf zone.

Keywords