A5101655601- Fish Ecology and Management Studies
- Avian ecology and behavior
- Fish Biology and Ecology Studies
- Animal Behavior and Reproduction
- Marine and fisheries research
- Amphibian and Reptile Biology
- Aquatic Ecosystems and Phytoplankton Dynamics
- Insect and Pesticide Research
- Marine Invertebrate Physiology and Ecology
- Oceanographic and Atmospheric Processes
- Evolution and Genetic Dynamics
- Marine and coastal ecosystems
- Insect Resistance and Genetics
- Ecology and Vegetation Dynamics Studies
- Marine Bivalve and Aquaculture Studies
- Insect-Plant Interactions and Control
- Marine and environmental studies
- Insect and Arachnid Ecology and Behavior
- Isotope Analysis in Ecology
- Genetic diversity and population structure
- Evolutionary Game Theory and Cooperation
- Marine Biology and Ecology Research
- Fish biology, ecology, and behavior
- Physiological and biochemical adaptations
- Earthquake and Tsunami Effects
Tohoku University
2013-2020
Kyung Hee University
2019-2020
National Institute of Ecology
2019
Umeå University
2017
Statistics Sweden
2017
Nagano University
2011-2013
Nagoya University
2008-2011
Kyoto University
2004-2010
Osaka City University
1999-2004
Abstract Although theoretical studies have shown that the mixture strategy, which uses multiple toxins simultaneously, can effectively delay evolution of insecticide resistance, whether it is optimal management strategy under different insect life histories and types remains unknown. To test robustness this over histories, we developed a series simulation models cover almost all diploid same basic structure describing pest population dynamics resistance with discrete time steps. For each two...
Climate change affects ecological communities through its impact on the physiological performance of individuals. However, population dynamic species well inside their thermal niche is also determined by competitors, prey and predators, in addition to being influenced temperature changes. We use a trait-based food-web model examine how interplay between direct effects from indirect due changing interactions populations shapes consequences climate for entire communities. Our simulations...
Abstract Recent declines of macroalgal forests due to climate change imply that the aquaculture production macroalgae may also be negatively affected by ocean warming. It has previously been shown nutrient enrichment can offset negative impact warming on survival and growth cultivated macroalga Undaria pinnatifida, although it increase risk herbivory unrecognized mesograzers. Observations several hundreds or thousands isopod Cymodocea japonica around U. pinnatifida cultivation ropes in...
Abstract Rapid range expansions of invasive species are a major threat to ecosystems. Understanding how increase their habitat ranges and environmental factors, including intensity human activities, influence dispersal processes is an important issue in invasion biology, especially for management. We have investigated spatially heterogeneous factors expansion by focusing on long-distance dispersal, which frequently assisted activities. developed models varying two underlying event. These...
The evolution of resistance against pesticides is an important problem modern agriculture. high-dose/refuge strategy, which divides the landscape into treated and nontreated (refuge) patches, has proven effective at delaying evolution. However, theoretical understanding still incomplete, especially for combinations limited dispersal partially recessive resistance. We reformulate a two-patch model based on Comins derive simple quadratic approximation to analyze effects dispersal, refuge size,...
Abstract – Age at maturity in males of the freshwater goby Tridentiger brevispinis , a species with exclusive paternal care, was investigated two populations Lake Biwa, Japan, that differed markedly nest site abundance. At Ohmi‐maiko, where sites were scarce, most matured age 3, and mean body size guarding eggs nests larger than sampled randomly (including both nonguarding males) population. Conversely, Minamihama, abundant, many 1, there no difference between collected randomly. The slope...
Herbivores often have huge impacts on plant performance. In order to reduce damage from herbivory, plants evolve antiherbivore defenses, the mechanisms of which been studied a theoretical viewpoint. studies, models defense schedules assumed uniform intensity herbivory or constant rate encounter herbivores throughout season. However, some apparently appear for only limited period instead whole growing season plant. our study, we analyzed optimal schedule allocation under that occurs within...
Abstract Males of the stream goby Rhinogobius sp. DA with exclusive paternal care court females in fast water currents. Female choice this was observed field. A current itself does not seem to be advantageous for mating. Neither large male size nor long dorsal fin, both being sexually dimorphic traits, related female selectivity. Females favored males that courted on points at which relatively fast. Water velocity courtship positively correlated a condition factor males, indicating poor...
Females of the stream goby Rhinogobius sp. DA with paternal care favor males courting in fast water currents, whereby they mate high parental ability. Here we examined female choice male nest size this laboratory. The dichotomous experiment clearly indicated that females prefer large nests. Spawning at nests seems to improve egg survival rates natural habitats goby. We discuss possibility multiple criteria
The longterm data on daily abundance of jellyfish (mostly Aurelia aurita) trapped in the intake gates Ikata Nuclear Power Plant south coast central part Iyo-Nada Seto Inland Sea, Japan was examined for a 14-year period (April 1998 to March 2012) relation environmental variables, i.e. temperature, salinity, and residual current, which last measured February, May, August November. abundance, expressed as wet weight, generally increased April, reached maximum September, markedly decreased from...
四国西岸に位置する法花津湾において2005年から2007年の夏季にビデオモニタリングを行い，湾内表層で形成されるミズクラゲ‘集群出現頻度の時間変動について調べた。ミズクラゲ集群出現頻度には，8月中旬から増加し，9-10月に減少する長周期変動と，10-15日周期で増減を繰り返す短周期変動が存在した。特に，短周期変動の強弱の経年変化は，四国西岸域で生じる急潮の強弱の経年変化と一致していた。そこで，急潮とミズクラゲ集群出現頻度の短周期変動との関係を明らかにするため，2007年の夏季法花津湾において係留観測と海洋観測を行った。法花博湾へ到達した急潮は湾内に暖水流入を引き起こすとともに，湾スケールの海水交換を励起した。この暖水流入にともなって湾外の既存水塊中にいたミズクラゲが湾内へ輸送され，湾内表層で受動的に集群することによって，夏季法花津湾表層ではミズクラゲ集群出現頻度が10-15日周期で変動していると考えられる。
相模湾において， 2008年に水中設置自動昇降ブイシステムによる係留観測を行い，湾内の流速変動について調べた。日本南岸海域の黒潮流路は. 6月3日付近に非大蛇行接岸流路から離岸流路へ選移し，それにともなって湾内の流動構造が一変した。6月3日以降，黒潮は比較的安定した非大蛇行離岸流路を取り，その間，湾中央部では水深200 m付近に最大振幅を持つ50-70日周期の流速変動が卓越した。この流速変動は湾北部の高気圧性の循環の形成に起因し，高気圧性の循環の消長は房総半島沖の黒潮流軸の変動と対応していた。この高気圧性の循環は， 26.2-26.6 σθ層のレンズ構造の内部に形成され，湾北部でこの循環が形成されるとき，水深200...