矢橋人工島周辺の生物調査 2 : プランクトンの種類組成からみた人工島周辺の状況
スポンサーリンク
概要
- 論文の詳細を見る
The investigations to examine the effect of the construction of the artificial island at the offshore of Yabase on the natural environment have been performed. In this paper, water quality from a standpoint of the plankton communities in 1977 was considered. Fragilaria crotonensis and Closterium aciculare were abundantly observed in May and June and Pediastrum biwae was dominant species during August to November. In July, when it was the period of the alternation of the species composition, the number of plankton was scarce and the similarity index between plankton communities found in the different waters was rather low. At the Yabase canal between lake shore and the artificial island, Anabaena macrospora was abundantly appreared in June, while in the other places this species was quite rare. At the Akanoi bay the mass of Polyerthra and Eudorina species was found respectively in 22th of May and in 23th of June. At the Akanoi bay and at the Yabase canal which is known as the most eutrophicated waters in lake Biwa. Fragilaria crotonensis was considered to be less suitable. The amount of chlorophyll was richer at the Yabase canal in May and June. On the other hand, it was richer at the Akanoi bay in July and August but it was considered that the most of chlorophyll was originated from the nanno plankton. It was estimated from the comparison of the amount of chlorophyll and the numbers of the phytoplakton that Pediastrum found in the Yabase canal contained the numerous dead planktons.
論文 | ランダム
- トラクタ足廻りの再生修理法-1-(講座)
- 整備技術30年の歩み (建設機械30年の歩み)
- 最近の建設機械における整備性の向上について (整備技術(特集))
- 運転と整備 (標準化(特集)) -- (建設機械に関する国際規格(案))
- 建設機械整備工場の工賃原価計算および整備工賃低減の問題点 (整備(特集))