渦鞭毛藻類シスト群集は富栄養化指標として有効か？
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【2010年度日本プランクトン学会春季シンポジウム】プログラム「原生生物の多様性と生態的機能」Dinofiagellate cysts, which are hypnozygotes produced during their sexual life cycle, have been mainly utilized as index fossils in biostratigraphy. In addition, some of these cysts have been regarded as seeds for forthcoming harmful algal blooms in marine environmental sciences. Recently these dinoflagellate cysts have been used for understanding paleoenvironmental changes, particularly eutrophication process due to both natural conditions and anthropogenic activities. Two major signals for eutrophication are recognizable by looking at dinofiagellate cysts; the Oslafjord signal and the Heterotroph signal. The Oslofjord signal is characterized by a remarkable increase in total cyst densities accompanied by increases in a single species such as the autotrophic Lingulodinium machaerophorum in the case of Oslofjord, Norway. The Heterotroph signal is indicated by dominance of heterotrophic species such as the cysts of Polykrikos kofoidii/schwartzii, cysts of Protoperidinium spp. and/or cysts of the diplopsalid in Tokyo Bay and Apponagansett Bay in Massachusetts, U.S.A., because these dinoflagellates can consume autotrophic and heterotrophic microplanktonic organisms. The relationship between eutrophication (enrichment of nutrients) and increases of both autotrophic and heterotrophic dinoflagellate cysts involving the Oslofjord and Heterotroph signals can be explained as in Fig. 4. However, in order to employ these signals for understanding other environmentally different areas more adequate data of such as species-specific relationships and their correlations with nutrient limitation levels is needed.
論文 | ランダム
- R1) コウモリ類調査研究情報交換会-関東地方のコウモリ類の生息状況について-責任者(自由集会, 野生生物保護学会 2002 年大会大会報告 : 講演要旨)
- 南西諸島固有種動物の分子遺伝学的研究 : ヤンバルクイナ他2種、沖縄産オオコウモリ2種の遺伝子分析による塩基配列の決定と分子系統学
- 日本のコウモリ類とその保護 (特集 野生動物モニタリングと環境保護--第134回日本獣医学会学術集会 シンポジウムより)
- 小型コウモリ類の絶滅したと想像される南西諸島内の3島と現存している島の森林率
- 新島におけるコウモリ類の生息状況