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尾瀬ヶ原の池溏に生息する枝角類に対する洪水の影響
帆苅, 信;朴, 虎東
Permalink : http://hdl.handle.net/2115/84954
JaLCDOI : 10.14943/lowtemsci.80.409
KEYWORDS : 枝角類;動物プランクトン;泥炭池溏;尾瀬ヶ原;Cladocera;zooplankton;flood;Ozegahara mire
Abstract
近年尾瀬ヶ原では洪水が増加していることが指摘されており，湿原内の生物への影響が懸念されている．そこで尾瀬ヶ原上田代の24池溏について2018年5月～11月にかけて枝角類の調査を行い，洪水による影響の有無を調べた．その結果，洪水による直接的な影響はみられなかったが，洪水の結果池溏内に侵入したであろう魚類によって枝角類は影響を受けていることが明らかになった．また，魚類が確認された池溏のうち，多くの池溏では翌月には個体群密度が大幅に増加していたことから，魚類は1つの池溏にとどまらず，他の池溏に移動している可能性が示唆された．
In recent years，floods have been increasing in the Ozegahara mire. Floods may be affecting organisms in the pools of the mire. To investigate the effects of flooding，cladocerans were studied in 24 pools in the Kamitashiro area of the Ozegahara mire from May to November 2018. The direct effects of the floods were unclear; however，the effects of the fish that would have invaded the pools during the floods on cladocerans were clarified. In many pools where fish were confirmed，the population density of cladocerans increased significantly in the following month. Fish may，therefore，have moved into multiple additional pools.
In recent years，floods have been increasing in the Ozegahara mire. Floods may be affecting organisms in the pools of the mire. To investigate the effects of flooding，cladocerans were studied in 24 pools in the Kamitashiro area of the Ozegahara mire from May to November 2018. The direct effects of the floods were unclear; however，the effects of the fish that would have invaded the pools during the floods on cladocerans were clarified. In many pools where fish were confirmed，the population density of cladocerans increased significantly in the following month. Fish may，therefore，have moved into multiple additional pools.
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