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Estimates of resource transfer via winged adult insects from the hyporheic zone in a gravel-bed river

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Title: Estimates of resource transfer via winged adult insects from the hyporheic zone in a gravel-bed river
Authors: Rahman, Mirza A. T. M. Tanvir Browse this author
Negishi, Junjiro N. Browse this author →KAKEN DB
Akasaka, Takumi Browse this author →KAKEN DB
Nakamura, Futoshi Browse this author →KAKEN DB
Keywords: dispersal
resource transfer
riparian zone
subsurface interface
Issue Date: May-2021
Publisher: John Wiley & Sons
Journal Title: Ecology and Evolution
Volume: 11
Issue: 9
Start Page: 4656
End Page: 4669
Publisher DOI: 10.1002/ece3.7366
Abstract: Hyporheic zone (HZ) locates below the riverbed providing habitat for macroinvertebrates from where the winged adult insects (i.e., hyporheic insects, HIs) emerge and bring out aquatic resources to the riparian zone. This study estimated mean daily flux as dry biomass (BM), carbon (C), and nitrogen (N) deriving from the dominant HI species Alloperla ishikariana (Plecoptera, Chloroperlidae) for a 4th-order gravel-bed river during the early-summer to summer periods. We hypothesized that HIs were an important contributor in total aquatic resources to the riparian zone. In 2017 and 2018, we set parallelly (May to August) and perpendicularly (June to October) oriented Malaise traps to catch the lateral and longitudinal directional dispersing winged adults of A. ishikariana, and other Ephemeroptera, Plecoptera, Trichoptera, and Diptera from the river and estimated the directional fluxes of them. We further split the directional fluxes as moving away or back to the channel (for lateral) and from down- to upstream or up- to downstream (for longitudinal). Alloperla ishikariana was similar to other Plecoptera species and differed clearly from Ephemeroptera and Trichoptera in directional characteristics of resources flux, suggesting that the extent and directions of HZ-derived resource transfer depend on taxon-specific flight behaviors of HIs. Contributions of A. ishikariana to the riparian zone in total aquatic C and N transfer seasonally varied and were lower in May (5%-6%) and August (2%-4%) and the highest in July (52%-70%). These conservative estimates largely increased (9% in May) after the supplementary inclusion of Diptera (Chironomidae and Tipulidae), part of which were considered HIs. We demonstrated that HZ could seasonally contribute a significant portion of aquatic resources to the riparian zone and highlighted the potential importance of HZ in nutrient balance in the river-riparian ecosystem.
Rights: Estimates of resource transfer via winged adult insects from the hyporheic zone in a gravel-bed river. Rahman Mirza A. T. M. Tanvir, Negishi Junjiro N., Akasaka Takumi, Nakamura Futoshi, Ecology and evolution 11(9). Copyright (c) 2021 John Wiley & Sons Ltd.
Type: article
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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