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Circumpolar occurrence of eugregarinid protozoan Cephaloidophora pacifica associated with Antarctic krill, Euphausia superba

Published online by Cambridge University Press:  27 February 2008

Kunio T. Takahashi ,
Masaki Kobayashi ,
So Kawaguchi ,
Junko Saigusa ,
Atsushi Tanimura ,
Mitsuo Fukuchi ,
Mikio Naganobu  and
Tatsuki Toda
Kunio T. Takahashi*
Affiliation:
Faculty of Engineering, Soka University, 1-236, Tangi-cho, Hachioji, Tokyo 192-8577, Japan
Masaki Kobayashi
Affiliation:
Faculty of Engineering, Soka University, 1-236, Tangi-cho, Hachioji, Tokyo 192-8577, Japan
So Kawaguchi
Affiliation:
Australian Government Antarctic Division, Channel Highway, Kingston, TAS 7050, Australia
Junko Saigusa
Affiliation:
Faculty of Engineering, Soka University, 1-236, Tangi-cho, Hachioji, Tokyo 192-8577, Japan
Atsushi Tanimura
Affiliation:
Faculty of Bioresources, Mie University, 1577 Kurimamachiya-cho, Tsu, Mie 514-8507, Japan
Mitsuo Fukuchi
Affiliation:
National Institute of Polar Research, 9-10 Kaga 1-chome, Itabashi-ku, Tokyo 173-8515, Japan
Mikio Naganobu
Affiliation:
National Research Institute of Far Seas Fisheries, 5-7-1 Orido, Shimizu-ku, Shizuoka-shi, Shizuoka 424-8633, Japan
Tatsuki Toda
Affiliation:
Faculty of Engineering, Soka University, 1-236, Tangi-cho, Hachioji, Tokyo 192-8577, Japan
*
*current address: Australian Government Antarctic Division, Channel Highway, Kingston, TAS 7050, Australia[email protected]
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Abstract

The geographical distribution of protozoan parasite Cephaloidophora pacifica Avdeev (Order Eugregarininda) associated with Antarctic krill, Euphausia superba, was examined in samples collected from the vicinity of the Antarctic Peninsula, near Syowa Station, and Pacific and Indian sectors of the Southern Ocean. Cephaloidophora pacifica was found at all stations around the Antarctic, with 96.4% of the euphausiids infected (n = 195). The numbers of C. pacifica per krill ranged from 0 to 8089 krill-1, and the average was 350.0 ± 787.8 (mean ± SD). The frequency distributions of C. pacifica showed an overdispersed parasite population (i.e. the variance was greater than the mean) at all locations. Statistical analysis showed that whilst the geographical location did not have a significant effect on intensity of C. pacifica the maturity stage of krill did, with an increasing intensity of infection as krill matures. The infestation of E. superba by eugregarinid protozoan is considered to be a circum-Antarctic phenomenon, and it occurs equally throughout the Southern Ocean.

Keywords

Cephaloidophora indicageographical distributionmaturity stageparasiteSouthern Ocean
Type
Biological Sciences
Information
Antarctic Science , Volume 20 , Issue 5 , October 2008 , pp. 437 - 440
Copyright
Copyright © Antarctic Science Ltd 2008

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