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Terrigenous leaf-utilizing life of the tube-bearing annelid Anchinothria cirrobranchiata (Annelida: Onuphidae) in the deep sea

Published online by Cambridge University Press:  04 November 2022

Luna Yamamori*
Affiliation:
Seto Marine Biological Laboratory, Field Science Education and Research Center, Kyoto University, 459 Shirahama, Nishimuro, 649-2211, Wakayama, Japan
Takeya Moritaki
Affiliation:
Marine Biological Laboratory, Toba Aquarium, 3-3-6 Toba, 517-8517, Mie, Japan
Makoto Kato
Affiliation:
Graduate School of Human and Environmental Studies, Kyoto University, Sakyo, Kyoto, 606-8313, Japan
*
Author for correspondence: Luna Yamamori, E-mail: strobilation980@gmail.com

Abstract

Deep-sea ecosystems are generally oligotrophic because they lack photosynthesizing producers. On deep-sea slopes near land, however, various terrestrial plant remains flow to and are deposited on near-shore deep bottoms. From a depth of 300 m off the Pacific coast of Owase, central Japan, we collected an onuphid polychaete, Anchinothria cirrobranchiata (Annelida: Onuphidae), which lives in a dorsoventrally flattened portable tube. The polychaete tubes were made of sand, as well as leaves and twigs of terrestrial evergreen trees. The leaves glued on the portable tubes were chartaceous, blackish and tough; they belonged mainly to two genera of Fagaceae, Castanopsis and Quercus, which are dominant components of coastal evergreen oak forests. In aquaria, the polychaetes fed on the leaves on their tubes, as well as autochthonous sedimented leaves, suggesting utilization of terrigenous plant litter as food. As to the evolution of Anchinothria, a molecular phylogenetic analysis suggests that Anchinothria is monophyletic with other Hyalinoeciinae (Nothria, Leptoecia, Hyalinoecia).

Type
Research Article
Copyright
Copyright © The Author(s), 2022. Published by Cambridge University Press on behalf of Marine Biological Association of the United Kingdom

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