• 待兼山コロキウム 講演者ご病気により中止となりました.
    • 2009/1/19Mon 15:00〜
    • サイバーメディアセンター7階会議室
    • Dr. Jungmin Lee (Pusan National University)
      • Title: Derivation of prey-taxis and its application: is prey-taxis a good strategy for a control agent?
      • Abstract
        A characteristic feature of living organisms is that they respond to the environment in search for food and reproductive opportunity.
        In particular, predators can move towards high prey density, which is called prey--taxis.
        In this talk, we present how a prey-taxis model can be derived using a modified Kareiva-Odell approach and a parabolic limit.
        An alternative derivation of a prey-taxis model is also outlined based on a model with resting stages.
        Subsequently we consider an application of a prey-taxis model: a role of prey-taxis on spreading prey population.
        We find that prey--taxis alone does not slow prey spread although it does in the presence of an Allee effect for the prey.
    • Professor Tae-Soo Chon (Pusan National University)
      • Title: Species abundance patterns in benthic macroinvertebrate communities in stream across different levels of pollution
      • Abstract
        Benthic macroinvertebrates are regarded as an efficient indicator group in
        aquatic ecosystems due to their sedentary behaviours, taxonomic diversity, and
        optimally-long life cycle (i.e., continuous expression of environmental
        impact). Communities of benthic macroinvertebrates were collected with a Surber
        sampler in streams across different levels of pollution in the southern
        Peninsula of Korea, and experimental data were presented to compare chironomids
        with the total benthic macroinvertebrates regarding community structure and
        species abundance distributions (SADs). Species richness in chironomids was
        relatively consistent across different levels of pollution except at the highly
        polluted sites, while the total number of species richness gradually decreased
        as the level of pollution increased. The number of species in low abundance of
        chironomids was characteristically lower in SADs, while the number of species
        with low abundance in the communities excluding chironomids was higher
        compared with chironomids. Abundance patterns were further discussed regarding
        presentation of disturbance states in aquatic ecosystems.

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