EXAMINATION OF ENVIRONMENTAL FACTORS AFFECTING THE LARGE SPATIAL DISTRIBUTION OF EGERIA DENSA / オオカナダモの広域空間分布に影響を及ぼす環境要因の検討
- Resource Type
- Journal Article
- Authors
- Kohei YAMAGUCHI; Seiji MIYAZONO; Takao KODAMA; Yoshihisa AKAMATSU; 児玉 貴央; 宮園 誠二; 山口 皓平; 赤松 良久
- Source
- 土木学会論文集B1(水工学) / Journal of Japan Society of Civil Engineers, Ser. B1 (Hydraulic Engineering). 2020, 76(2)1261
- Subject
- Egeria densa
UAV
flow regime
nonnative species
suppression
- Language
- Japanese
- ISSN
- 2185-467X
The overgrowth of Egeria densa is a major issue in the Gonokawa River. It is necessary to identify the environmental factors negatively affecting E. densa in the river in order to develop the management strategies for eradicating the nonnative aquatic plant. In this study, we quantified the coverage of E. densa with UAV and analyzed the relationships between the coverage and environmental factors on preflood seasons using simple linear regression and generalized linear model. Our results indicated that the coverage was significantly and negatively related to the coefficient of variation of the river discharge in the preflood seasons, suggesting that the river discharge fluctuations could suppress the overgrowth of E. densa in the river.