A5066233651- Hydrology and Sediment Transport Processes
- Fish Ecology and Management Studies
- Soil erosion and sediment transport
- Hydrology and Watershed Management Studies
- Ecology and Vegetation Dynamics Studies
- Wildlife Ecology and Conservation
- Freshwater macroinvertebrate diversity and ecology
- Forest Ecology and Biodiversity Studies
- Land Use and Ecosystem Services
- Species Distribution and Climate Change
- Aquatic Invertebrate Ecology and Behavior
- Soil and Water Nutrient Dynamics
- Peatlands and Wetlands Ecology
- Fire effects on ecosystems
- Forest ecology and management
- Genetic diversity and population structure
- Coastal wetland ecosystem dynamics
- Isotope Analysis in Ecology
- Avian ecology and behavior
- Fish Biology and Ecology Studies
- Forest Management and Policy
- Marine and fisheries research
- Environmental DNA in Biodiversity Studies
- Tree Root and Stability Studies
- Urban and spatial planning
Hokkaido University
2015-2024
Hokkaido Museum
2021-2023
Daido University
2022
Hokkaido University of Science
1997-2022
Hokkaido University of Education
2021
The University of Tokyo
2007-2017
Google (United States)
2015
Kyushu University
2009
Hokkaido Research Organization
2009
Rakuno Gakuen University
2009
Abstract Effects of coarse woody debris (CWD) on channel morphology and sediment storage were investigated at five sites, representative first‐order to fifth‐order streams. In the steep bedrock‐confined stream (first‐second order), interaction between CWD was limited, except where breakage upon falling produced pieces shorter than width. Channel widening, steepening associated with observed predominantly in third‐ Variation width gradient regulated by CWD. stream, most derived from riparian...
Abstract Inorganic sediment is not the only solid‐fraction component of river flows; flows may also carry significant amounts large organic material (i.e. wood), but characteristics these wood‐laden (WLFs) are well understood yet. With aim to shed light on relatively unexamined phenomena, we collected home videos showing natural with wood as main solid component. Analyses watersheds and streams where were recorded allowed us define for first time WLFs, describe broaden definition transport...
Intraspecific population diversity (specifically, spatial asynchrony of dynamics) is an essential component metapopulation stability and persistence in nature. In 2D systems, theory predicts that should increase with ecosystem size (or habitat network size): Larger ecosystems will harbor more diverse subpopulations stable aggregate dynamics. However, current theories developed simplified landscapes may be inadequate to predict emergent properties branching ecosystems, overlooked but...
Geomorphological processes that commonly transport soil down hillslopes and sediment woody debris through stream systems in steep, mountainous, forest landscapes can operate sequence gravitational flowpaths, forming a cascade of disturbance alters riparian ecosystems. The affected landscape be viewed time as network containing shifting mosaic patches — linear zones created by the cascading geomorphological processes. Ecological disturbances range severity from effects flows, which completely...
This chapter contains sections titled: Introduction Sustainable Management Options for Braided Rivers Conclusions Acknowledgements References
Abstract Anthropogenic noise has been increasing globally. Laboratory experiments suggest that disrupts foraging behavior across a range of species, but to reveal the full impacts noise, we must examine on among species in wild. Owls are widespread nocturnal top predators and use prey rustling sounds for localizing when hunting. We conducted field effect traffic owls’ ability detect prey. Results efficiency declines with levels due acoustic masking and/or distraction aversion noise....
The extraordinary population growth of the 20th century will subside in 21st century, followed by depopulation, constituting first decline phase human history Japan and other developed countries. drivers land-use change during are expected to differ from those phase; however, research on is limited. Identifying these necessary develop effective management plans for biodiversity ecosystem services phase. First, we calculated probability farmland abandonment Hokkaido, a Japanese food...
The distribution of coarse woody debris in a fifth-order Cascade Range (Oregon) stream system was examined from geomorphic point view. number, volume, location, orientation, decay class, and pool formation roles were investigated. processes production, transport, storage, which vary with channel valley floor geomorphology, are responsible for the pattern on floors. Channel width sinuosity main factors that control storage sites, hydrologic effects debris. amount number pool-forming pieces...
Abstract The Makomanai River in northern Japan has suffered considerable fine sediment deposition, especially a reach where channel works have been constructed. Four contiguous reaches were examined for deposition of and the effects such on periphyton biomass; two had bank protection, respectively, other being unmodified. influence sedimentation epilithic biomass (chlorophyll weight organic matter weight) autotrophic index (AI), relationship between these hydraulic variables was emphasized....
The fluvial export of large woody debris (LWD) was monitored in 131 reservoirs throughout Japan. Published data on the dissolved and particulate organic carbon were used to estimate contributions LWD budgets. Of all variables tested, watershed area most important explaining (LWDC) export, followed by annual precipitation. LWDC per unit relatively high small watersheds, highest intermediate‐sized decreased watersheds. In a proportion retained narrow valley floors may fragment or decay...
Abstract Human activities have had the strongest impacts on natural ecosystems since last glacial period, including alteration of interspecific relationships such as food webs. In this paper, we present a historical record major alterations trophic structure by revealing millennium-scale dietary shifts brown bears ( Ursus arctos ) Hokkaido islands, Japan, using carbon, nitrogen and sulfur stable isotope analysis. Dietary analysis revealed that salmon consumption in eastern region...
Relationships between abundance of juvenile masu salmon (Oncorhynchus masou) and stream habitat were analyzed on two spatial scales, reach channel unit, in northern Hokkaido, Japan. Reach-scale analyses revealed that high water temperatures limited the population level increased with cover availability. These limiting factors strongly associated presence riparian forest, emphasizing its importance for population. Channel-unit scale showed greater use pools by salmon, depth abundant...
Abstract The annual fluvial export of large wood (LW) was monitored by local reservoir management offices in Japan. LW per unit watershed area relatively high small watersheds, peaked intermediate and decreased watersheds. To explain these variations, we surveyed the amount with respect to channel morphology 78 segments (26 each size class) Nukabira River, northern We examined differences dynamics, including its recruitment, transport, storage, fragmentation decay along spectrum sizes. found...
Abstract The meanders and floodplains of the Kushiro River were restored in March 2011. A 1.6‐km stretch straightened main channel was remeandered by reconnecting cutoff former backfilling reach, a 2.4‐km meander restored. Additionally, flood levees removed to promote river–floodplain interactions. There four objectives this restoration project: restore in‐stream habitat for native fish invertebrates; floodplain vegetation increasing flooding frequency raising groundwater table; reduce...
ABSTRACT In recent years, we have experienced mega‐flood disasters in Japan due to climate change. the last century, been building disaster prevention infrastructure (artificial levees and dams, referred as “grey infrastructure”) protect human lives assets from floods, but these hard protective measures will not function against mega‐floods. Moreover, a drastically depopulating society such that Japan, farmland abandonment prevails, it be more difficult maintain grey with limited tax income....