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ID 28918
本文ファイル
別タイトル
The true nature of the enigmatic copepod genus Limnoncaea from plankton in Japan and the importance of parasito-planktology
著者
Ho, Ju-shey
Grygier, Mark J.
キーワード
Limnoncaea
Oncaeidae
Ergasilus
Ergasilidae
parasite
host
Saphirella
life cycle
planktology
parasitology
NDC
動物学
抄録(英)
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.
掲載誌名
日本プランクトン学会報
51巻
1号
開始ページ
13
終了ページ
24
出版年月日
2004-02
出版者
日本プランクトン学会
ISSN
0387-8961
NCID
言語
日本語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 2004 The Plankton Society of Japan
部局名
生物圏科学研究科