Abstract

Mystery Lake is a slightly acidic, oligotrophic subalpine lake situated within a hardwood nature preserve in northeastern Taiwan. This lake is rich in diatoms, with a total of 76 diatom species found in the surface sediments. As the first part of reporting these diatoms, 36 species, belonging to 16 genera and six families, are described in this article, basing on the morphology observed under the scanning electron microscope. Of the species described here, 17 are newly recorded in Taiwan. They are: Achnanthes renei, A. rupestoides, A. subhudsonis, Achnantheiopsis frequentissima var. magna, Actinella brasiliensis, Eunotia intermedia, E, minor, E. septentrionalis, E. soleirolii, E. zygodon, Fragilaria bidens, Psammothidium marginulatum, Pseudostaurosira brevistriata, Punctastriata linearis, Staurosira construens, Staurosira eliptica, and Synedra lanceolata. In addition, six genera, namely Achnantheiopsis, Actinella, Psammothidium, Pseudostaurosira, Punctastriata, and Staurosira, are newly recorded in Taiwan. These results provide basic information for further study in the lake.

中文摘要

神祕湖位於台灣東北部南澳闊葉林保護區內，屬於中海拔略酸性的貧養湖。此湖中滋長豐富的矽藻種類，在湖積物表面共發現有76種矽藻。本文針對其中分屬於16屬36種之形態特徵予以描述，其中17種為台灣的新紀錄種，即Achnanthes renei, A. rupestoides, A. subhudsonis, Achnantheiopsis frequentissima var. magna, Actinella brasiliensis, Eunotia intermedia, E. minor, E. septentrionalis, E. soleirolii, E. zygodon, Fragilaria bidens, Psammothidium marginulatum, Pseudostaurosira brevistriata, Punctastriata linearis, Staurosira construens, Staurosira eliptica和Synedra lanceolata等。此外， Achnantheiopsis, Actinella, Psammothidium, Pseudostaurosira, Punctastriata和Staurosira等六個屬是新記錄屬。本文為往後在該湖進行研究提供基礎資料。

Keyword: Taiwan, Mysterious Lake, Diatom, New record, SEM.