九州大学数理生物学研究室

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巌佐 庸(いわさ よう)

巌佐 庸(いわさ よう)
所属:九州大学理学研究院生物科学部門数理生物学教室、九州大学高等研究院長
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役職:教授
所属学会:日本数理生物学会、日本進化学会、日本生態学会、個体群生態学会、日本動物行動学会、日本分子生物学会、Ecological Society of America、International Society of Behavioral Ecology、Society for Mathematical Biology

岩見 真吾(いわみ しんご)

岩見 真吾(いわみ しんご)
所属:九州大学理学研究院生物科学部門数理生物学教室、科学技術振興機構さきがけ(兼任)
役職:准教授
所属学会:日本エイズ学会、日本ウイルス学会、日本生態学会、日本数理生物学会、日本応用数理学会、日本数学会

波江野 洋(はえの ひろし)

波江野 洋(はえの ひろし)
所属:九州大学理学研究院生物科学部門数理生物学研究室
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役職:助教
所属学会:日本数理生物学会、American Association for Cancer Research

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MEセミナーとは九州大学数理生物学研究室で1966年から続くインフォーマルセミナーです。
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内之宮光紀 : uchinomiya[at]bio-math10.biology.kyushu-u.ac.jp ※[at]を@に置き換えて下さい。
2014.11.18, 13:30-

Determining the appropriate spatial scale of management in fishery planning
(Nao Takashina : Kyushu University)

     The success of any spatially explicit management (e.g., establishing no-take zones) will rely on the spatial scale of management. For any managed region, managers must decide how much to subdivide the area under concern: from implementing a uniform approach across the region to a unique approach in each of hundreds patches and everything in between. However, there is no general theory for how the spatial scale affects management outcomes such as optimal fishery profit and biomass. To explore this question, I construct a mathematical model that follows an age-structured-harvested population in a one-dimensional patchy environment connected by larval dispersal. The spatial scale of management determines the number of managed segments in the region, within which fisheries take place or managers introduce a reserve so as to maximize the aggregate fishery profit. Assuming no cost to subdividing the region (e.g., implementation cost), I find that the aggregate fishery profit increases with the number of segments. Specifically, if the habitat landscape is positively autocorrelated, then the aggregate fishery profit increases with diminishing returns. This fact suggests that if cost to subdividing the region increases with the number of segments and the habitat distribution is positively autocorrelated, an intermediate management scale is likely to maximize net fishery benefit.
     This work was done in collaboration with Marissa L. Baskett (University of California, Davis).

2014.11.18, 15:00-

Title: Phenotype adjustment promotes adaptive evolution in a game without conflict
「カイロウドウケツエビはどうして雄と雌なのか?:遺伝的進化では適応度最大が実現できないが可塑性は実現させる」
(Yoh Iwasa : Kyushu University)

     Organisms may adjust their phenotypes in response to social and physical environments. Such phenotypic plasticity is known to help or retard adaptive evolution. Here, we study the evolutionary outcomes of adaptive phenotypic plasticity in an evolutionary game involving two players who have no conflicts of interest. A possible example is the growth and sex allocation of a lifelong pair of shrimps entrapped in the body of a sponge. We consider random pair formation, the limitation of total resources for growth, and the needs of male investment to fertilize eggs laid by the partner. We compare the following three different evolutionary dynamics: (1) No adjustment: each individual develops a phenotype specified by its own genotype; (2) One-player adjustment: the phenotype of the first player is specified by its own genotype, and the second player chooses the phenotype that maximizes its own fitness; (3) Two-player adjustment: the first player exhibits an initial phenotype specified by its own genotype, the second player chooses a phenotype given that of the first player, and finally, the first player readjusts its phenotype given that of the second player. We demonstrate that both one-player adjustment and two-player adjustment evolve to achieve maximum fitness. In contrast, the dynamics without adjustment fails in some cases to evolve outcomes with the highest fitness. For an intermediate range of male cost, the evolution of no adjustment realizes two hermaphrodites with equal size, whereas the one-player adjustment and two-player adjustment realize a small male and a large female.
     This was done in collaboration with Sachi Yamaguchi (Kanagawa University)

2014.11.20, 10:30-

Dynamics and efficacy of viral interference in HIV infection
(Fabrizio Mammano : Inserm U941, Hospital Saint Louis, Paris, France)

     Viral interference is a phenomenon by which a virus infected cell displays reduced susceptibility to infection by a virus of the same species. This phenomenon, also called superinfection resistance, is generally due to occupation or down-regulation of cellular proteins that are required for virus replication. In this respect, the principal mechanism of HIV superinfection resistance is down-modulation of the CD4 receptor from the cell surface. Recent data, however, strongly suggest that HIV superinfection resistance involves several CD4-independent mechanisms that remain to be fully understood.
     In spite of the well-documented ability of HIV to interfere with superinfection, cells harboring multiple HIV genomes are readily observed both in infected subjects and in tissue culture. Double infection allows genetic recombination, a key mechanisms contributing to HIV diversity and evolution, and potentially implicated in pathogenesis. Thus, while HIV can clearly induce superinfection resistance under some circumstances, this phenomenon appears to be regulated.
     We will discuss our recent data on the delay after which viral interference is effective, its magnitude and modification of its potency over time.

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九州大学理学部生物学科 数理生物学研究室
〒812-8581 福岡市東区箱崎6-10-1
tel (092) 642-2641 fax (092) 642-2645
e-mail yohiwasa[at]kyudai.jp
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