A5002301818- Ecology and Vegetation Dynamics Studies
- Bamboo properties and applications
- Plant Taxonomy and Phylogenetics
- Forest ecology and management
- Plant and animal studies
- Forest Ecology and Biodiversity Studies
- Ecology and Conservation Studies
- Tree Root and Stability Studies
- Fire effects on ecosystems
- Forest Insect Ecology and Management
- Plant Parasitism and Resistance
- Animal Ecology and Behavior Studies
- Seedling growth and survival studies
- Bioenergy crop production and management
- Plant Molecular Biology Research
- Insect-Plant Interactions and Control
- Urban and spatial planning
- Aquatic Ecosystems and Phytoplankton Dynamics
- Plant and Biological Electrophysiology Studies
- Horticultural and Viticultural Research
- Insect and Arachnid Ecology and Behavior
- Leaf Properties and Growth Measurement
- Cocoa and Sweet Potato Agronomy
- Tree-ring climate responses
- Botany and Plant Ecology Studies
Akita Prefectural University
2011-2024
Agency for Cultural Affairs
1996-1998
Kyoto University
1992-1996
Abstract. We examined the response of tree seedling emergence and survival to dieback Sasa canopy gap formation in an old‐growth forest near Lake Towada, northern Japan. Synchronous death occurred 1995. established four types sampling sites differing conditions (Closed or Gap) status (Dead Live). Gap‐Dead had highest light levels greatest fluctuation soil temperatures. The alone facilitated ( Acer japonicum, Fagus crenata, Fraxinus lanuginosa , Tilia japonica ) Acanthopanax sciadophylloides,...
Abstract The flowering behavior and juvenile growth habits of bamboos are reviewed in relation to clonal growth, the significance mode life history is discussed. rhizome system composes basic frame bamboo plants determines fundamental ecological features. We can recognize clear differences systems between tropical temperate regions, as well changes behavior. Bamboos warmer regions have clump‐forming pachymorph tend flower at shorter intervals less synchronously. Temperate form closed forests...
Abstract. The population dynamics of two monocarpic bamboos, Sasa kurilensis and S. tsuboiana , were studied for more than 10 years after establishment following mass flowering. Both species show vigorous rhizomatous vegetative reproduction growing up to maturity, but horizontal expansion in the seedling stage was much kurilensis. pattern changes culm density strikingly similar: densities both increased until they reached full‐density states, which decreased accordance with growth. However,...
Bamboos are typical examples of highly synchronized semelparous species. Their mass-flowering events occur at supra-annual intervals but they sometimes flower on a small scale in off-years. If some bamboo ramets (culms) genet and die off-years, whereas other culms the same do not synchronously, can still survive blooming an off-year could participate next event. At level, effect might be similar to that achieved by synchronously reproducing iteroparous plants. In addition, if multiple genets...
Although many studies have reported that clonal growth interferes with sexual reproduction as a result of geitonogamous self-pollination and inbreeding depression, the mating costs are expected to be reduced when genets spatially intermingled others. This study examined how affects both female male reproductive success by studying population mass-flowering plant, Sasa veitchii var. hirsuta, high degree intermingling.In 10 × m plot, were discriminated based on multilocus genotypes 11 nuclear...
Question: The aim of the present study is to determine whether seed/seedling predation will increase and Fagus survival decline with recovery Sasa cover. Methods: We examined crenata regeneration for seven years in an old-growth Fagus-Sasa forest near Lake Towada, northern Japan, by examining effects simultaneous death Sasa, tree canopy gap formation, mast seeding seed seedling rodents on seeds current year seedlings. established four types sites differing (closed or gap) status (dead alive)...
Abstract Despite the advantage of plant clonality in patchy environments, studies focusing on genet demography relation to spatially heterogeneous environments remain scarce. Regeneration bamboos forest understoreys after synchronous die‐off provides an opportunity for assessing how they come proliferate across light environments. In a Japanese forest, we examined population Sasa kurilensis over 7‐year period starting 10 years die‐off, shortly which some genets began spreading horizontally...
Abstract The ability of clonal plants to spread horizontally and share resources within genets has long been considered advantageous in spatially heterogeneous environments, yet our understanding how such traits relate its widespread success dominance is still limited. Using a dwarf bamboo, Sasa kurilensis , that often dominates cool‐temperate forest understorys, we investigated population recovery over 20 years after an episodic die‐off may be augmented by expansion via rhizomes. Previous...
During the last few decades, pine wilt disease has spread to cool-climate regions in Japan and, more recently, potential risk of it spreading into European midwest also become a concern. In coastal stand (84.7 ha) Akita, near northern limit Japan, we investigated seasonal variations incidence damage caused by trees and oviposition disease's insect vector, Monochamus alternatus, during two-year period. Foliage discoloration occurred throughout each year, its variation showed bimodal pattern...
Summary Clonal plants produce semi‐autonomous modules (ramets). The spatial distribution of ramets affects lifetime reproductive success via self‐pollination, kin competition and among genotypes over space nutrients. These, in turn, influence the evolution timing flowering monocarps (flowering is fatal), such as bamboos. vegetative growth period interval) bamboos shows a geographic cline from tropical (short‐interval) to temperate (long‐interval) regions. However, mechanisms underlying...
小坂鉱山の煙害地に造成されたニセアカシア林について，92 か所の林分調査資料を解析し，施工後50 年を経た段階での緑化の成否を明らかにするとともに，林分の形成過程を推測した。調査区の幹密度は759.8±249.6 本／ha，平均樹高は13.9±3.7 m であった。ほとんどの調査区で森林が形成され，平均断面積合計は24.8±7.0 m2／ha と40 年生ミズナラ林に相当することから，緑化の第一目的は達成できていると評価された。しかし，遷移については在来種の優占度が低いことから，遅滞している林分が多いことが確認された。これには，かつて植生が煙害により広範囲で衰退したことが原因で，在来種の種子散布がほとんど行われてこなかったことが重要な要因と考えられた。一方林分の形成過程は，ニセアカシアは定着後の急速な初期成長により比較的早く成林状態に達するものの，20 年生以降の林分では倒木等による幹密度の減少が根萌芽による幹の加入により補われ，群落構造に大きな変化がないと推察された。今後の造成地の管理は，老齢に向かうニセアカシア群落の維持機構を解明することが不可欠であると考えられた。
Premise Understanding the flower visitation history of individual pollinators is key in study pollination networks, but direct tracking labor intensive and, more important, does not capture information about previous interactions an individual. Therefore, a protocol to detect most pollen species on body surfaces pollinator could elucidate its history. Methods and Results Under microscope, we observed 6.0‐µL droplets from sample solution (1.0 or 3.0 mL) containing grains collected individuals...
Abstract Mass flowering (masting) has been hypothesized to be an adaptive strategy satiate florivores/granivores. However, few studies have corroborated this by examining seed predation in multiple patches of varying sizes across a wide geographical range over years. Moreover, the trophic consequences masting for parasitoids florivores/granivores and their feedback effects are poorly understood. Here, we used nationwide two bamboo species, Sasamorpha borealis var. Phyllostachys nigra...
Abstract. Question: The aim of the present study is to determine whether seed/seedling predation will increase and Fagus survival decline with recovery Sasa cover. Methods: We examined crenata regeneration for seven years in an old‐growth Fagus‐Sasa forest near Lake Towada, northern Japan, by examining effects simultaneous death , tree canopy gap formation, mast seeding seed seedling rodents on seeds current year seedlings. established four types sites differing (closed or gap) status (dead...