日本から記載されたリムノンケア属Limnoncaeaカイアシ類の正体 : プランクトン学と寄生虫学の複合領域的研究の必要性

日本プランクトン学会報 Volume 51 Issue 1 Page 13-24 published_at 2004-02
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Title ( jpn )
日本から記載されたリムノンケア属Limnoncaeaカイアシ類の正体 : プランクトン学と寄生虫学の複合領域的研究の必要性
Title ( eng )
The true nature of the enigmatic copepod genus Limnoncaea from plankton in Japan and the importance of parasito-planktology
Creator
Ho Ju-shey
Grygier Mark J.
Source Title
日本プランクトン学会報
Volume 51
Issue 1
Start Page 13
End Page 24
Abstract
The history of an enigmatic copepod genus Limnoncaea Kokubo, 1914 is reviewed. Copepods of this genus had been recorded from plankton in many fresh/brackish lakes and ponds of Japan. It is recently concluded that Limnoncaea is relegated to a junior synonym of Ergasilus Nordmann, 1832, the species of which are mainly parasitic on fish. Here we explain how lack of interchange between the fields of planktology and parasitology prevented an earlier appreciation of this fact. Recently, postmated adult females are suggested to exhibit a dual life mode: (1) some ergasilids are permanently attached to the host; in some cases, accompanied with highly transformed bodies and appendages to avoid detachment (generally known life cycle in ergasilids); (2) others are loosely associated to the host; like copepodids and adult males, without such transformation. In addition, the latter kind of female carries egg-sacs with a relatively small number of eggs per sac (up to 20), in contrast to larger number of eggs carried by females that are permanently attached to the host. The latter type is known from plankton in the world. Complex life cycles of symbiotic copepods have so far caused several taxonomic confusions not only in fresh/brackish waters but also in marine regimes (e.g., Saphirella problem). Hence planktologists should erase the boundary between planktology and parasitology to understand the natural history of their subject organisms precisely.
Keywords
Limnoncaea
Oncaeidae
Ergasilus
Ergasilidae
parasite
host
Saphirella
life cycle
planktology
parasitology
NDC
Zoology [ 480 ]
Language
jpn
Resource Type journal article
Publisher
日本プランクトン学会
Date of Issued 2004-02
Rights
Copyright (c) 2004 The Plankton Society of Japan
Publish Type Version of Record
Access Rights open access
Source Identifier
[ISSN] 0387-8961
[NCID] AN00197015