FEEDING ECOLOGY OF COPEPODID STAGES OF EUCALANUS BUNGII IN THE CHUKCHI AND NORTHERN BERING SEAS IN OCTOBER 1988 (14th Symposium on Polar Biology)

• Main Authors: オオツカ ススム, オオヤエ セイシ, タニムラ アツシ, フクチ ミツオ, ハットリ ヒロシ, ササキ ヒロシ, マツダ オサム, Susumu OHTSUKA, Seisi OHAYE, Atsushi TANIMURA, Mitsuo FUKUCHI, Hiroshi HATTORI, Hiroshi SASAKI, Osamu MATSUDA
• Format: Report
• Language: English
• Published: Proceeding 1993
• Subjects: Chukchi; Polar Biology; Proceedings of the NIPR Symposium on Polar Biology
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=5182; http://id.nii.ac.jp/1291/00005182/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=5182&item_no=1&attribute_id=18&file_no=1

Gut contents of the third to sixth copepodid stages of Eucalanus bungii (except for the sixth copepodid stage of male) from the Chukchi and northern Bering Seas in October 1988 were investigated with a light and a scanning electron microscopes. According to LM analysis all the copepodid stages of E. bungii fed on diatoms, dinoflagellates, tintinnids, crustaceans, and mineral particles. SEM examinations of gut contents of the fourth and fifth copepodid stages revealed that they ingested fecal pellets and discarded houses of oikopleurid larvaceans in addition to phytoplankton cells, suggesting that E. bungii showed coprophagy and saprophagy. The presence of an oil drop in the prosome and the reduced, thread-like gut of E. bungii indicated that E. bungii in the Chukchi and northern Bering Seas in October may supposedly have been originated from non-feeding diapausing stocks in deep-waters or prediapausing stages in the southern seas.