| 研究課題/領域番号 |
23K26924
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| 補助金の研究課題番号 |
23H02231 (2023)
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| 研究種目 |
基盤研究(B)
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| 配分区分 | 基金 (2024)
補助金 (2023) |
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| 応募区分 | 一般 |
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| 審査区分 |
小区分39060:生物資源保全学関連
小区分39070:ランドスケープ科学関連
合同審査対象区分:小区分39060:生物資源保全学関連、小区分39070:ランドスケープ科学関連
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| 研究機関 | 筑波大学 |
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研究代表者 |
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| 研究分担者 |
AGOSTINI SYLVAIN 筑波大学, 生命環境系, 助教 (20700107)
和田 茂樹 筑波大学, 生命環境系, 助教 (60512720)
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| 研究期間 (年度) |
2023-04-01 – 2027-03-31
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| 研究課題ステータス |
交付 (2024年度)
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| 配分額 *注記 |
18,590千円 (直接経費: 14,300千円、間接経費: 4,290千円)
2026年度: 3,250千円 (直接経費: 2,500千円、間接経費: 750千円)
2025年度: 4,160千円 (直接経費: 3,200千円、間接経費: 960千円)
2024年度: 5,460千円 (直接経費: 4,200千円、間接経費: 1,260千円)
2023年度: 5,720千円 (直接経費: 4,400千円、間接経費: 1,320千円)
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| キーワード | Climate change / Ocean Acidification / Top-down control / Community Ecology / Climate Change |
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| 研究開始時の研究の概要 |
Using CO2 seeps, we can assess the response of entire communities to ocean acidification. Here, we use a temperate Pacific CO2 seep discovered by the applicants, that will allow us to examine how the interactions between benthic macroherbivores and algal habitats are affected. We will use a combination of field surveys, manipulative experiments, and lab measurements. The results will, for the first time, demonstrate how the important role performed by benthic macroherbivores will be altered by ocean acidification, with implications for the structure and functioning of algal habitats.
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| 研究実績の概要 |
This study demonstrates the indirect effects of ocean acidification on benthic macroherbivores and the habitat. This year's main objective was to identify benthic macroherbivore species that are vulnerable to ocean acidification. Carbonate chemistry conditions in the study sites at Shikine-jima have continued to be monitored (including their pH, temperature, salinity, and total alkalinity), with our two sites representing present-day and future end-of-the-century conditions. From initial surveys, the most vulnerable taxa appears to be sea urchins, which despite being able to survive under ocean acidification conditions, are demonstrating clear changes in their physiology and ecological role. The two most abundant sea urchins (Diadema setosum and Echinometra sp.) were collected from the sites, their biological traits were measured, and aquarium experiments were run. These included measurements of their size, gonadal content, respiration and feeding rates. Overall, these indicated that the sea urchins were negatively affected by ocean acidification resulting in fewer, smaller individuals. Additionally, we further measured the physical structure of their tests and spines (in order to assess their calcification / dissolution responses) using microCT and FTIR, as well as their gut microbiota (16S metabarcoding) in order to assess their health. It is likely that these negative impacts on the benthic macroherbivores will have indirect effects on the habitat of the community (this will be the focus in the subsequent years).
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
The investigation and experiment proceeded as planned.
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| 今後の研究の推進方策 |
In the future, while continuing to identify other vulnerable benthic macroherbivores (and measure their biological traits), we will focus on assessing the effects of ocean acidification on algal habitats. These will involve assessments of their photophysiology (using a diving PAM), community productivity (in-situ chamber measurements), food quality (CN ratios/fatty-acid). Following this, we will investigate the indirect role of ocean acidification on algal habitats via effects on the benthic macroherbivores. This will involve assessments using feeding trials (to assess food preference), food-web analyses, as well as recruitment experiments to assess community structure dynamics (with and without grazer-exclusion cages). Taken together, this should help our research demonstrate how ocean acidification will negatively impact the ability of benthic macroherbivores to control algal habitats and how this functional loss will play an important role in causing algal habitats to shift into undesirable degraded states.
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