2006 Fiscal Year Final Research Report Summary
Evaluation of ecosystem function of coastal areas based on biodiversity of tropical seagrass beds
| Project/Area Number |
16405007
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 海外学術 |
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| Research Field |
Ecology/Environment
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| Research Institution | Chiba University |
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Principal Investigator |
NAKAOKA Masahiko Chiba University, Graduate School of Science and Technology, Associate Professor (90260520)
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| Co-Investigator(Kenkyū-buntansha) |
KONDOH Akihiko Chiba University, Professor (30201495)
KOMATSU Teruhisa University of Tokyo, Ocean Research Institute, Associate Professor (60215390)
MIYAJIMA Toshihiro University of Tokyo, Ocean Research Institute, Research Associate (20311631)
MATSUMASA Masatoshi Iwate Medical University, School of Liberal Arts and Sciences, Associate Professor (50219474)
SUZUKI Takao Tohoku University, Graduate School of Life Science, Research Associate (10124588)
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| Project Period (FY) |
2004 – 2006
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| Keywords | Seagrass bed / Biodiversity / Ecosystem function / Physical disturbance / Environmental Stress / Thailand / Tropical ecosystem / Biogeochemistry |
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| Research Abstract |
The main objective of the project is to establish evaluation methods of status and functions of tropical seagrass beds based on measurements of biodiversity. To achieve this goal, we conducted following research subjects during the period between April 2004 and March 2007. 1) Large-scale comparisons of major seagrass beds along the coast under different impacts of human activities, and 2) long-term monitoring and experimental analyses on the relationships between environmental factors, species diversity and ecosystem functioning of the seagrass beds. Based on our fieldwork, we found that major physical and chemical processes influencing biodiversity and ecosystem functioning of seagrass beds vary greatly among sites with different impacts of human activities. Especially, material input from river discharge greatly affects matter and energy flows in seagrass ecosystems. We found that biodiversity measured by various indices are correlated with variables representing functions of seagras
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s ecosystems, i.e., biomass, productivity, resistance to disturbance and resilience from disturbance. Based on this, we establish the evaluation methods of seagrass functional status based on observations of biochemical processes of seagrasses and biodiversity of seagrasses and associated biota.
Some of our research sites were severely affected by the tsunami that hit the coastal areas of the Indian Ocean on Dec. 26th, 2004. The tsunami was the source of catastrophic disturbance to coastal ecosystems and human societies along southeastern Asian shores. Because we monitored abundance and biomass of seagrass and its associated animal community before the arrival of the tsunami-affected sites, this has given us a rare opportunity to quantitatively evaluate the effects of the tsunami disturbance on the biodiversity and ecosystem functioning of seagrass beds by taking the data using the same method after the tsunami. We found that the tsunami impacts on benthic organisms varied with and without seagrass vegetation, and that the degree of temporal changes in assemblage structure was not necessarily related to the magnitude of the tsunami disturbance. Less
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[Presentation] 海草藻場における海草群落構造と魚類群集の関係2006
Author(s)
堀正 和, 鈴木 孝男, 田中 義幸, 仲岡 雅裕, 向井 宏
Organizer
2006年日本プランクトン学会・日本ベントス学会合同大会
Place of Presentation
広島県情報プラザ
Year and Date
20060928-1001
Description
「研究成果報告書概要(和文)」より
