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Fish assemblage patterns in floodplain lakes in the Mississippi Delta
Fish assemblage patterns in floodplain lakes in the Mississippi Delta
We evaluated the influences of habitat connectivity and local environmental factors on the distribution and abundance patterns of fish functional groups in 17 floodplain lakes in the Yazoo River Basin, USA. Our results suggest that decreases in habitat connectivity, forested wetland buffers and water quality resulting from environmental manipulations may cause local extinction of certain fish taxa and accelerate the dominance of tolerant fishes in floodplain lakes.
アメリカのミシシッピ川下流域に点在する三日月湖を対象に河川・氾濫原の連結度と魚類機能群との関係を解析した．この研究により，本流と氾濫原のつながりが三日月湖の魚類機能群をコントロールしている可能性があることを明らかにした．
Fish colonization and extinction dynamics in a desert river system
Fish colonization and extinction dynamics in a desert river system
We examined fish immigration and extinction rates, and abundance and occupancy patterns, in relation to habitat isolation, size and variability in the Rio Grande and its tributaries in the Trans-Pecos region of Texas, U.S.A. Our results suggest that increased habitat fragmentation by human activities can accelerate the regional extinction of certain native fish taxa and the dominance of ecologically tolerant, possibly non-native fish, leading to a decline in regional diversity.
We determined long-term changes in fish assemblages, river discharge, salinity, and local precipitation, and examined hydrological drivers of biotic homogenization in a dryland river ecosystem, the Trans-Pecos region of the Rio Grande/Rio Bravo del Norte (USA/Mexico). Our results suggest that decreasing discharge from the Rio Conchos has led to decreasing flow and increasing salinity in the Rio Grande below the confluence. This spatially uneven desertification and salinization of the Rio Grande has in turn led to a region-wide homogenization of hydrological conditions and of taxonomic and functional attributes of fish assemblages.
アメリカとメキシコの国境を流れるリオグランデ川の本流・支流間の連結度と魚類の移入・絶滅プロセスとの関係を解析した．この研究から，河川ネットワークにおける生息場の分断化や渇水が魚類の局所的な絶滅を引き起こす可能性があることを明らかにした．
リオグランデ川の希少魚種であるChihuahua Shiner Notropis chihuahuaとMexican Stoneroller Campostoma ornatumの空間分布と環境要因の関係を明らかにした．
リオグランデ川の河川魚類群集，降水量，流量，塩分濃度の約30年間の経年変化を解析した．この研究から，河川流量や水質の経年変化が特定の魚種の局所的な絶滅を引き起こし，調査地域のβ多様性の減少 (biotic homogenization) を引き起こしている可能性があることを明らかにした．
Early life history of the Rio Grande Blue Sucker
To better understand the factors affecting ontogenetic habitat shifts of an imperiled aridland river fish, we examined relationships between the abundance of young-of-the-year (YOY) Rio Grande Blue Sucker and various abiotic variables in the Trans-Pecos region of the Rio Grande in Texas, USA. The habitat associations we documented support the growing body of research emphasizing the importance of maintaining sufficient and appropriately timed flows to avoid prolonged low flows that limit habitat availability for native fish species during sensitive life stages in the Rio Grande and other aridland rivers.
リオグランデ川の未記載魚種であるRio Grande Blue Sucker Cycleptus sp. cf. elongatus の個体数と環境要因との関係を解析し，この未記載種の初期生態を明らかにした．
Use of environmental DNA for estimating the abundance patterns of non-native aquatic plants and fish assemblage compositions in lotic systems
Use of environmental DNA for estimating the abundance patterns of non-native aquatic plants and fish assemblage compositions in lotic systems
We studied the invasive aquatic plant Egeria densa in the tributaries of the Gonokawa River in Japan to compare the E. densa detection rate of the eDNA method with that of the three sampling methods and examine the relationships of the eDNA flux to the upstream plant coverage, plant stem fragment flux, and plant tissue DNA flux of E. densa in the study sites on each season. Our results suggest that the eDNA methods have a potential as monitoring tool for early detection and relative abundance estimation of invasive aquatic plants in lotic systems.
We examined the fish assemblage patterns on different tributary habitat types (natural and artificial tributaries) and relationships between the fish assemblages and environmental factors in the Gonokawa River in Japan using quantitative environmental DNA (eDNA) metabarcoding. Our results suggest that quantitative eDNA metabarcoding is an efficient monitoring tool, elucidating that artificial stream modifications would affect fish assemblage compositions in the tributaries.
外来沈水植物のオオカナダモ Egeria densaの繁茂抑制手法の開発を目的とした研究プロジェクトに携わり，環境DNA分析の流水域におけるオオカナダモ定量モニタリング手法としての有効性を明らかにした．
環境DNA定量メタバーコーディング法を用いて，河川流量の減少や支流の護岸化が魚類多様性や特定の魚類の減少を引き起こし得ることを明らかにした．
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