武陵七家灣溪流域底棲矽藻資源調查資料

Survey data of benthic diatom resources in a Cijiawan Creek drainage basin in Wuling, Taiwan

本調查資料是2019年間，在七家灣溪流域各樣站所採集之矽藻物種鑑定、藻種電顯影像、分布位置及環境因子等資料進行建置，可供為未來各項相關研究利用參考。調查結果顯示，9個樣站共鑑定出27屬55種矽藻。將各樣點所採集之藻類進行頻度分析Planothidium frequentissimum, Cocconeis placentula var. euglypta，和Achnanthidium convergens這三種在各樣點出現頻度最高，其次是Nitzschia amphibia和Synedra ulna。

Background
Cijiawan Creek in Shei-Pa National Park of central Taiwan nurtures a unique and important natural resource, the Formosan landlocked salmon (Oncorhynchus masou formosanus). In order to conserve and restore the species population, many related researches are already underway, including long-term ecological monitoring. Benthic diatoms are the main basic producers of the food network of the stream ecosystem, and their species composition will directly or indirectly impact the entire ecosystem. This paper includes a list of benthic diatoms and related information surveyed in a Cijiawan Creek drainage basin in 2019.
New information
In the paper we provide a detailed dataset that contains 1,839 benthic diatom occurrences collected during a field campaign in 2019. A total of 55 diatom (Bacillariophyta) taxa belonging to 9 orders, 17 families, and 27 genera were collected. The frequency analysis indicated that Planothidium frequentissimum, Cocconeis placentula var. euglypta, and Achnanthidium convergens were the most common diatom species at the sampling stations. The second most common diatom species were Nitzschia amphibia and Synedra ulna.