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タイトル: | Influence of potential grazers on picocyanobacterial abundance in Lake Biwa revealed with empirical dynamic modeling |
著者: | Cai, Ji Hodoki, Yoshikuni Ushio, Masayuki https://orcid.org/0000-0003-4831-7181 (unconfirmed) Nakano, Shin-ichi |
著者名の別形: | 程木, 義邦 潮, 雅之 中野, 伸一 |
キーワード: | empirical dynamic modeling grazers heterotrophic nanoflagellates indirect effects picocyanobacteria |
発行日: | 2020 |
出版者: | Taylor & Francis |
誌名: | Inland Waters |
巻: | 10 |
号: | 3 |
開始ページ: | 386 |
終了ページ: | 396 |
抄録: | Picocyanobacteria in lakes generally occur as single cells (single-celled picocyanobacteria; SPcy) or colonies (colonial picocyanobacteria; CPcy), and the latter form has been considered an adaptation to grazing pressure. In addition to direct effects of grazing, grazers may also have important indirect effects on picocyanobacteria, such as those from nutrient regeneration and trophic cascades. Interactions between picocyanobacteria and their grazers in lakes can thus be complex and difficult to predict. To evaluate the influence of various grazers on SPcy and CPcy in Lake Biwa, Japan, we followed seasonal changes in their abundances and potential grazers at 2-week intervals over 2 years. The data collected were analyzed using empirical dynamic modeling (EDM), a model-free, nonlinear time-series method. We found that heterotrophic nanoflagellates (HNF), rotifers (Keratella, Polyarthra, and Trichocerca), cladocerans, and copepods played important and differing roles in controlling the abundances of SPcy and CPcy. Notably, HNF had an apparent positive influence on SPcy abundance, despite being considered major consumers of SPcy. This result suggested that the enhancement of SPcy growth due to nutrient regeneration by HNF might exceed losses from mortality due to grazing by HNF. EDM also suggested that colony formation by picocyanobacteria may be unidirectional, with SPcy tending to form CPcy. Our findings show that the seasonal dynamics of SPcy and CPcy in Lake Biwa are influenced by a variety of grazers, which may play differing ecological roles in the aquatic food web. |
著作権等: | This is an Accepted Manuscript of an article published by Taylor & Francis in Inland Waters on 24 Feb 2020, available online: http://www.tandfonline.com/10.1080/20442041.2020.1711682 The full-text file will be made open to the public on 24 Feb 2021 in accordance with publisher's 'Terms and Conditions for Self-Archiving'. This is not the published version. Please cite only the published version. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 |
URI: | http://hdl.handle.net/2433/267533 |
DOI(出版社版): | 10.1080/20442041.2020.1711682 |
出現コレクション: | 学術雑誌掲載論文等 |
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