Tomoya Iwata
A5052074196- Fish Ecology and Management Studies
- Soil and Water Nutrient Dynamics
- Isotope Analysis in Ecology
- Freshwater macroinvertebrate diversity and ecology
- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Hydrology and Sediment Transport Processes
- Aquatic Invertebrate Ecology and Behavior
- Aquatic Ecosystems and Phytoplankton Dynamics
- Hydrology and Watershed Management Studies
- Methane Hydrates and Related Phenomena
- Wastewater Treatment and Nitrogen Removal
- Fish Biology and Ecology Studies
- Environmental DNA in Biodiversity Studies
- Soil erosion and sediment transport
- Marine Biology and Ecology Research
- Marine and fisheries research
- Fish biology, ecology, and behavior
- Groundwater and Isotope Geochemistry
- Forest Ecology and Biodiversity Studies
- Water Quality and Pollution Assessment
- Phosphorus and nutrient management
- Wildlife Ecology and Conservation
- Microbial metabolism and enzyme function
- Land Use and Ecosystem Services
University of Yamanashi
2015-2025
Takeda (Japan)
2009-2024
Kyoto University
2001-2004
Gifu University
2004
National Institute of Technology, Tomakomai College
2003
Hokkaido University
2003
National College of Technology, Wakayama College
2002
Otsuka (Japan)
2001
Ecology Letters (2011) 14: 289–294 Abstract The decomposition of plant litter is one the most important ecosystem processes in biosphere and particularly sensitive to climate warming. Aquatic ecosystems are well suited studying warming effects on because otherwise confounding influence moisture constant. By using a latitudinal temperature gradient an unprecedented global experiment streams, we found that will likely hasten microbial produce equivalent decline detritivore-mediated rates. As...
Plant litter breakdown is a key ecological process in terrestrial and freshwater ecosystems. Streams rivers, particular, contribute substantially to global carbon fluxes. However, there little information available on the relative roles of different drivers plant fresh waters, particularly at large scales. We present global-scale study streams compare biotic, climatic other environmental factors rates. conducted an experiment 24 encompassing latitudes from 47.8° N 42.8° S, using mixtures...
An experiment in >1000 river and riparian sites found spatial patterns controls of carbon processing at the global scale.
Tropical stream communities are increasingly threatened by a vast array of human perturbations. However, ecological impacts deforestation on poorly understood in tropical rain forests Southeast Asia. We investigated the past riparian associated with slash-and-burn agriculture habitats and Borneo, East Malaysia, comparing streams running through primary those secondary that had been deforested 9–20 yr previously. Distinctive differences were found depositional character habitats;...
The effect of resource subsidies on recipient food webs has received much recent attention. purpose this study was to measure the effects significant seasonal seaweed deposition events, caused by hurricanes and other storms, species inhabiting subtropical islands. represents a pulsed subsidy that is consumed amphipods flies, which are eaten lizards predatory arthropods, in turn consume terrestrial herbivores. Additionally, decomposes directly into soil under plants. We added six shoreline...
Abstract The relationship between detritivore diversity and decomposition can provide information on how biogeochemical cycles are affected by ongoing rates of extinction, but such evidence has come mostly from local studies microcosm experiments. We conducted a globally distributed experiment (38 streams across 23 countries in 6 continents) using standardised methods to test the hypothesis that enhances litter streams, establish role other characteristics assemblages (abundance, biomass...
Running waters contribute substantially to global carbon fluxes through decomposition of terrestrial plant litter by aquatic microorganisms and detritivores. Diversity this may influence instream globally in ways that are not yet understood. We investigated latitudinal differences mixtures low high functional diversity 40 streams on 6 continents spanning 113° latitude. Despite important variability our dataset, we found the effect decomposition, which explained as evolutionary adaptations...
The flux of emerging aquatic insects from streams can provide a significant energy subsidy to riparian web‐building spiders. However, despite the high temporality insect emergence, effects such dynamics on spider distribution are poorly understood. To examine relationship, headwater stream in northern Japanese deciduous forest was experimentally manipulated by using greenhouse‐type covering, during May July. Under natural conditions, and terrestrial abundances dramatically decreased...
Adult aquatic insects emerging from streams are a fundamental resource sustaining riparian bird communities in broad‐leaved deciduous forests. We investigated how stream geomorphology affects the insect flux and insectivorous abundance 26 riparian‐forest plots during spring season northern Japan. Lateral dispersal of emergent into forest exponentially decreased with distance stream. Similar to distribution, flycatchers gleaners concentrated their foraging attacks around channel, preying...
Rivers and streams contribute to global carbon cycling by decomposing immense quantities of terrestrial plant matter. However, decomposition rates are highly variable large-scale patterns drivers this process remain poorly understood. Using a cellulose-based assay reflect the primary constituent detritus, we generated predictive model (81% variance explained) for cellulose across 514 globally distributed streams. A large number variables were important predicting decomposition, highlighting...
A novel method for radioisotope-free photoaffinity labeling was developed, in which a bifunctional ligand is connected to target protein by activation of photoreactive group, such as an aromatic azido or 3-trifluoromethyl-3H-diazirin-3-yl and identification the ligated product achieved anchoring detectable tag through Staudinger–Bertozzi reaction with alkyl moiety that survives photolysis. The chemical ground this confirmed using model compounds group under photoirradiation presence trapping...
Plant litter represents a major basal resource in streams, where its decomposition is partly regulated by traits. Litter-trait variation may determine the latitudinal gradient which mainly microbial tropics and detritivore-mediated at high latitudes. However, this hypothesis remains untested, as we lack information on large-scale trait for riparian litter. Variation cannot easily be inferred from existing leaf-trait databases, since nutrient resorption can cause traits of green leaves to...
Identifying nonpoint phosphorus (P) sources in a watershed is essential for addressing cultural eutrophication and proposing best-management solutions. The oxygen isotope ratio of phosphate (δ18OPO4) can shed light on P cycling ecosystems. This the first assessment δ18OPO4 distribution whole catchment, namely, Yasu River Watershed Japan. observed values river water varied spatially from 10.3‰ to 17.6‰. To identify watershed, we used an isoscape approach involving multiple-linear-regression...
Empirical studies have shown that temporally fluctuating inputs of resource subsidies can indirectly increase or decrease the abundance in situ resources by affecting generalist consumers feed on both and resources. By mathematical modeling, we develop a theoretical framework explain these variable consumer-mediated indirect effects. We show hierarchy timescales among fluctuations subsidy input rate consumers' reproductive aggregative numerical responses predict signs These predictions are...
Planktonic sulfur oxidizers are important constituents of ecosystems in stratified water bodies, and contribute to sulfide detoxification. In contrast marine environments, taxonomic identities major planktonic freshwater lakes still remain largely unknown. Bacterioplankton community structure was analyzed a lake, Lake Mizugaki Japan. the clone libraries 16S rRNA gene, clones very closely related oxidizer isolated from this Sulfuritalea hydrogenivorans, were detected deep anoxic water,...
AME Aquatic Microbial Ecology Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout JournalEditorsSpecials 36:189-194 (2004) - doi:10.3354/ame036189 Stream food web fueled by methane-derived carbon Ayato Kohzu1,*, Chika Kato2, Tomoya Iwata3, Daisuke Kishi2, Masashi Murakami2, Shigeru Nakano1, Eitaro Wada4 1Center for Ecological Research, Kyoto University, 509-3 Otsuka, Kamitanakami-Hirano, Otsu, Shiga 520-2113, Japan...
ABSTRACT Decomposition of plant litter is a key ecological process in streams, whose contribution to the global carbon cycle large relative their extent on Earth. We examined mechanisms underlying temperature sensitivity (TS) instream decomposition and forecast effects climate warming this process. Comparing data from 41 globally distributed sites, we assessed TS microbial total using nine species combined six mixtures. Microbial conformed metabolic theory ecology its was consistently higher...