Territory Established Location and Foraging Behaviour of Juveniles of Red Sea Bream Pagrus major and Crimson Sea Bream Evynnis japonica.

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  • 天然マダイおよびチダイ稚魚のなわばり形成場所と摂食行動
  • テンネン マダイ オヨビ チダイ チギョ ノ ナワバリ ケイセイ バショ ト

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Abstract

We observed territorial juveniles of red sea bream Pagrus major and crimson sea bream, Evynnis japonica to detect interspecific ecological differences in sympatric habitat at Morode Cove in Ehime Prefecture from July to October in 1994. P. major tended to establish its territory in sandy zones where Zostera japonica grew in abundance, whereas E. japonica tended to establish it in sandy zones; the habitats thus slightly differed between the two species. Six common foraging and searching behaviours (sand pecking, substrate pecking, digging, water column feeding, near bottom feeding, blowing) could be distinguished in the two species, but the frequency of four feeding behaviours differed between the two species. It is suggested that the two closely related species might possess different ecological features enabling their coexistence within a restricted nursery ground.

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