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タイトル: Direct and indirect effects of amphidromous shrimps on nutrient mineralization in streams in Japan
著者: Uno, Hiromi
Fukushima, Keitaro
Kawamura, Mariko  kyouindb  KAKEN_id
Kurasawa, Akira
Sato, Takuya
著者名の別形: 宇野, 裕美
福島, 慶太郎
河村, 真理子
倉澤, 央
佐藤, 拓哉
キーワード: Excretion
Migration
Benthic
Species interaction
Aquatic insect
発行日: Feb-2022
出版者: Springer Nature
誌名: Oecologia
巻: 198
号: 2
開始ページ: 493
終了ページ: 505
抄録: Animals affect element cycling in ecosystems by consumption and excretion. Amphidromous shrimps frequently dominate low-mid altitude streams, where downstream connectivity to oceans is sustained. Although shrimps’ direct influence on benthic communities has been studied, little is known about their influences on nutrient cycling. Here, we hypothesized that the dominance of shrimps alters nutrient mineralization by benthic macroinvertebrates in streams due to the difference in the quality and quantity of excretion between shrimps and aquatic insects. We tested this hypothesis through a field manipulative experiment, excretion measurements of animals, and field surveys. In the field manipulative experiment, the presence of shrimps slightly decreased the biomass of aquatic insects but tripled total benthic macroinvertebrate biomass directly through their own biomass. The mass-specific NH₄⁺ excretion rate by shrimps was similar to aquatic insects, and the areal NH₄⁺ excretion by benthic macroinvertebrates was increased by 2.5 times in the presence of shrimps. In contrast, shrimps excreted significantly less soluble reactive phosphorus (SRP) than aquatic insects, and the presence of shrimps did not affect areal SRP excretion by benthic macroinvertebrates. The field survey showed a positive correlation of NO₃⁻ concentration with the shrimp density, inferring the excess NH₄⁺ was nitrified. Although the nutrient concentration of stream water is frequently attributed to watershed conditions, the results of this study indicate that downstream connectivity to oceans may also influence nutrient dynamics of the stream through the density of amphidromous shrimps.
記述: 海から遡上する小型エビ類が川の生態系を大きく変える --海と川のつながりが担う役割--. 京都大学プレスリリース. 2022-02-16.
Shrimp cocktails served in Japanese rivers: Amphidromous shrimp excretions beat aquatic insects in contest of nutrient mineralization. 京都大学プレスリリース. 2022-04-08.
著作権等: This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s00442-022-05119-6
The full-text file will be made open to the public on 14 February 2023 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/2433/268235
DOI(出版社版): 10.1007/s00442-022-05119-6
PubMed ID: 35156151
関連リンク: https://www.kyoto-u.ac.jp/ja/research-news/2022-02-16-0
https://www.kyoto-u.ac.jp/en/research-news/2022-04-08
出現コレクション:学術雑誌掲載論文等

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