クメ　マナブ   Manabu Kume   久米　学    所属   石巻専修大学  理工学部    職種   准教授
言語種別	英語
発行・発表の年月	2014/04
形態種別	研究論文（学術雑誌）
査読	査読あり
標題	Winter fish community structures across floodplain backwaters in a drought year
執筆形態	未選択
掲載誌名	Limnology
出版社・発行元	SPRINGER JAPAN KK
巻・号・頁	15(2),pp.109-115
担当区分	筆頭著者
著者・共著者	Manabu Kume,Junjiro N. Negishi,Shiro Sagawa,Tetsuya Miyashita,Shigeyuki Aoki,Tetsuji Ohmori,Seiji Sanada,Yuichi Kayaba
概要	We examined fish community structures in floodplain backwaters in the Kiso River, Central Japan, in an uncommon drought year. Nine floodplain backwaters with varying levels of flood inundation frequency were surveyed for winter fish communities, and measured for local environmental variables in summer and winter periods. The winter fish community was better represented, with less diverse and physiologically tolerant species in backwaters with a decreasing flood pulse frequency. The temporal frequency of hypoxic conditions (dissolved oxygen of <2 mg l(-1)) and chlorophyll a in summer explained the heterogeneity of the fish community along the gradient of inundation frequency, while no variables measured in winter had an explanatory power. These results suggest that drought-induced, infrequent flood pulses in the autumn-winter period limited the dispersal opportunity of fishes, and thus maintained community structures selected by summer limiting factors until the survey took place in winter. Future comparisons of our data with those in non-drought years would provide important implications to the sustainable management of floodplains for wintering fishes against the increasing probability of future flow regime changes.
DOI	10.1007/s10201-013-0421-0
ISSN	1439-8621/1439-863X