Optimal life cycle schedule of heteromorphic macroalgae, as adaptations to a seasonal environment

Kazuhiro Bessho
(Kyushu University)

11/1/11, 13:30 - 16:00 at Room 3631 (6th floor of building 3 of the Faculty of Sciences)

Macroalgea (seaweeds) show diverse life cycles. Especially notable is the difference between heteromorphic life cycle and isomorphic cycle. Species with heteromorphic life cycle have a large-sized multicellular algal body in one generation but have a microscopic-sized algal body in the other generation of a year. Here we developed mathematical models for the life cycle in the environment where mortality changes seasonally. Where we assumed that growth rate of large-sized generation decrease with increasing of total biomass by competition for light, or settlement success rate decrease by competition for space. We first discuss the optimal life cycle schedule for a heteromorphic species that achieves the maximum population growth rate. Secondly, we discuss the optimal life cycle schedule in the model with density dependence.

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