Phytoplankton growth and consumption by microzooplankton stimulated by turbulent nitrate flux suggest rapid trophic transfer in the oligotrophic Kuroshio
| Autor: | Eisuke Tsutsumi, Gen Kume, Taiga Honma, Takeyoshi Nagai, Toru Kobari, Fukutaro Karu, Takahiro Tanaka, Naoki Yoshie, Xinyu Guo, Koji Suzuki, Ayako Nishina, Takeru Kanayama, Daisuke Hasegawa, Hirohiko Nakamura, Takeshi Matsuno |
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| Rok vydání: | 2020 |
| Předmět: |
0106 biological sciences
010504 meteorology & atmospheric sciences 010604 marine biology & hydrobiology fungi lcsh:QE1-996.5 Foraging lcsh:Life Plankton 01 natural sciences lcsh:Geology lcsh:QH501-531 Oceanography Nutrient Productivity (ecology) Eddy lcsh:QH540-549.5 Phytoplankton Environmental science Photic zone lcsh:Ecology Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences Earth-Surface Processes Trophic level |
| Zdroj: | Biogeosciences, Vol 17, Pp 2441-2452 (2020) |
| ISSN: | 1726-4189 |
| Popis: | The Kuroshio Current has been thought to be biologically unproductive because of its oligotrophic conditions and low plankton standing stocks. Even though vulnerable life stages of major foraging fishes risk being entrapped by frontal eddies and meanders and encountering low food availability, they have life cycle strategies that include growing and recruiting around the Kuroshio Current. Here we report that phytoplankton growth and consumption by microzooplankton are stimulated by turbulent nitrate flux amplified by the Kuroshio Current. Oceanographic observations demonstrate that the Kuroshio Current topographically enhances significant turbulent mixing and nitrate influx to the euphotic zone. Graduated nutrient enrichment experiments show that growth rates of phytoplankton and microheterotroph communities were stimulated within the range of the turbulent nitrate flux. Results of dilution experiments imply significant microzooplankton grazing on phytoplankton. We propose that these rapid and systematic trophodynamics enhance biological productivity in the Kuroshio. |
| Databáze: | OpenAIRE |
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