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Graduate School of Science and Engineering
Science of Environment and Mathematical Modeling

Wild Life Preservation Laboratory

Website of the Laboratory/Prof.Osono 【In English&Japanese】

Professor. Takashi OSONO : Ecology and diversity of fungi
Professor. Motohiro HASEGAWA : Ecology of soil fauna

Staff

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Takashi OSONO
[Professor]
Acceptable course
Master's degree course
Doctoral degree course
Telephone : +81-774-65-6688
tosono@mail.doshisha.ac.jp
Office : KE-310
Database of Researchers
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Motohiro HASEGAWA
[Professor]
Acceptable course
Master's degree course
Doctoral degree course×
Telephone : +81-774-65-6366
mohasega@mail.doshisha.ac.jp
Office : KE-441
Database of Researchers

Research Topics

1. Mechanisms for maintaining diversity and function for soil fauna in forest ecosystem
2. Study for the effects of the various environmental disturbance on the soil biodiversity

Research Contents

Takashi OSONO, Professor:Ecology and diversity of fungi

Fungi, often invisible to the naked eyes, are responsible for decomposition and symbiotic interactions in terrestrial ecosystems. However, ecological functioning and biodiversity of fungi are largely unknown despite their importance as decomposers, endophytes, pathogens, and mycorrhizal symbionts. My research interest is on the biodiversity of functioning of fungi as biological resources from temperate to polar and tropical regions.

<1> Ecology and functional diversity of ligninolytic fungi
<2> Biodiversity and ecosystem functioning of polar region
<3> Aquatic plant manure and nutrient cycling in a watershed
<4> Biodiversity conservation of World Natural Heritage sites
<5> Functioning and evolution of plant-fungus mutualism


Motohiro HASEGAWA, Professor:Ecology of soil fauna

<1>
Mechanisms for maintaining diversity and function for soil fauna in forest ecosystem
To establish a sustainable management method to keep healthiness of forest ecosystems, we need to make the function in ecosystem to work effectively the mechanisms nutrient cycling. For the sake, we must investigate the decomposition process precisely and make clear the ecology of soil fauna and microorganisms relating with the structure and function of the soil organisms contributing the decomposition process.
We investigate the weight, nutrient, fungal length and structure of soil faunal community during the decomposition of needles. As a result, at the early stage of decomposition fungal lengths suddenly increased and content of nitrogen and phosphorus also increased. At that stage, fungal selective feeder (some species of Collembola) dominated in the litter. At the late stage of decomposition, the growth of fungi decreased and animal species feeding on feces or humus materials increased. The diversity of soil fauna was supported by the succession process with species turnover. We also investigated the importance of the composition of leaves and twigs in the litter layer to determine the structure of soil faunal communities. As a result, the representative species responded differently to the species of leaf or weight of litter. From this result, the weight and composition of litter layer is suggested to be an important factor to determine the soil faunal community. From these achievements, we could take the knowledge about the decomposition process and maintenance for the diversity of soil fauna.

<2>
Study for the effects of the various environmental disturbance on the soil biodiversity
Various group of organisms could be used for the indicator to the various environmental disturbance. However, the response of soil faunal community to the change of forest environment as a soil indicator was rarely studied. So, I investigated the influence of the forest management, resource amount, change of altitude, invasive species and road construction on the soil animal communities, and present the way to avoid or reduce disturbance effects.
For example, we studied the effects of tree harvesting methods on soil fauna in Borneo Island, Malaysia. We found that the reduced impact logging methods reduced the damage of logging for soil fauna compared with the conventional logging method. This tendency was common to the other decomposer organisms, trees and mammals. Therefore, this method of logging suggested to be useful method for sustainable use of forest and reducing the greenhouse gas emission

Keywords

  • Arctic, Antarctic, and alpine biodiversity
  • Endophytic fungi
  • Soil fauna
  • decomposition
  • ecosystem function
  • biodiversity
  • Collembola