The ecological study on the competitive exclusion of endemic species at the aphidophagous communities by a Japan-origin exotic predator

2015 Fiscal Year Final Research Report

• Project/Area Number: 24255013
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 海外学術
• Research Field: Applied entomology
• Research Institution: Kyoto University
• Principal Investigator: OSAWA Naoya 京都大学, (連合)農学研究科(研究院), 准教授 (10221821)
• Co-Investigator(Kenkyū-buntansha): TANAKA CHIHIRO 京都大学, 農学研究科, 教授 (60263133) ; TUNO NOBUKO 金沢大学, 自然科学研究科, 准教授 (60295102)
• Project Period (FY): 2012-04-01 – 2016-03-31
• Keywords: 侵入生物 / 個体群管理 / 天敵 / 群集 / 分子遺伝 / ナミテントウ / 外来種

Outline of Final Research Achievements

The field and laboratory experiments were performed to clarify the community study on aphidophagous invasive ladybird beetle Harmonia axyridis. From the field studies, H. axyridis at invasive area utilized invasive aphids and H. axyridis was one of common aphidophagous species at rather short period. This may be caused by many vacant niches at aphidophagous predators at the invaded area, with a low biodiversity of aphidophagous communities. From the laboratory experiments on exclusive competition between H. axyridis and sibling H. yedoensis with a surplus food condition, H. axyridis mainly excluded only H. yedoensis whereas H. yedonsis excluded both of H. axyridis and H. yedoensis, suggesting that specialization at H. yedoensis for certain habitats and preys may play one of important role on the coexistence between H. axyridis and H. yedoensis.

Free Research Field

昆虫生態学