2006 Fiscal Year Final Research Report Summary
Mechanisms of phytoplankton coexistence
| Project/Area Number |
15570011
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (C)
|
| Allocation Type | Single-year Grants |
|---|
| Section | 一般 |
|---|
| Research Field |
Ecology/Environment
|
|---|
| Research Institution | Chiba University |
|---|
Principal Investigator |
MIYAZAKI Tatsuo Chiba Univ., Marine Biosystems Res. Ctr., Professor, 海洋バイオシステム研究センター, 教授 (80142230)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
TOGASHI Tatsuya Chiba Univ., Marine Biosystems Res. Ctr., Assist. Prof., 海洋バイオシステム研究センター, 助手 (70345007)
YOSHIMURA Jin Shizuoka Univ., Fac. of Engineering, Professor, 創造科学技術大学院, 教授 (10291957)
|
|---|
| Project Period (FY) |
2003 – 2006
|
| Keywords | phytoplankton / paradox of plankton / paradox of enrichment / competition / coexistence / nutrients / lattice model / continuous culture |
|---|
| Research Abstract |
In this project, we studied mechanisms of phytoplankton coexistence, experimentally and theoretically.
(1) Culture experiments: Using continuous cultures of phytoplanktonic species, we examined coexistence and competition under various concentration of nutrients and flow speed of culture medium. Competition and exclusion of the green alga Scenedesmus quadricauda and the cyanobacterium Microcystis novacekii depended on nutrient concentration and flow speed of supply culture medium. Since experiments with varying supply modes of the medium, especially, has not been tried to date, the present results on the effects of the supply mode were new.
(2) Theoretical analysis: Competition in the low flow continuous culture, the paradox of plankton and the paradox of enrichment were examined. Dominant species in homogeneous environments is considered to be one or a few. Phytoplankton species diversity is usually high, though water environments seems homogeneous. This high diversity has been called "
… More
the paradox of plankton." In the higher nutrient conditions, diversity is considered to increase. However, diversity in the field observation of many water environments, this is not the case. This diversity change along nutrient gradient is called "the paradox of enrichment."
In the low nutrient and low flow continuous cultures, phytoplankton species were not necessarily under nominative concentration of nutrients, but were in reality under lower nutrient concentrations. This relation was species-specific and explained the lower diversity low in lower nutrient conditions. In the lattice model, we assumed slight differences in growth of ten species. We introduced "ecological time scale" that means it is long ecologically, but in the time scales the system is not in stable conditions. In this theoretical framework, we examined changes in the number of species. This growth rate depended on nutrient concentrations in the ecological time scale. Phytoplankton species grew more locally than it is generally considered. The local growth explained "the paradox of plankton". In higher nutrients, each species grew more globally, and some species became excluded. This means "the paradox of enrichment." Less
|
Research Products
(20 results)
-
[Journal Article] Power law for extinction process in multiple contact process.2007
Author(s)
Sakisaka, Y., Tainaka, K., Sugimine, N., Yoshimura, J., Hayashi, T., Aihara, K., Togashi, T., Miyazaki, T.
-
Journal Title
Journal of the Physical Society of Japan 76(2)
Pages: 023101-1-4
Description
「研究成果報告書概要(和文)」より
-
[Journal Article] Power law for extinction process in multiple contact process.2007
Author(s)
Sakisaka, Y., Tainaka, K., Sugimine, N., Yoshimura, J., Hayashi, T., Aihara, K., Togashi, T., Miyazaki, T.
-
Journal Title
Journal of the Physical Society of Japan. Vol.76, No.2
Pages: 023101-1-023101-4
Description
「研究成果報告書概要(欧文)」より
-
-
-
-
-
-
-
-
[Journal Article] A role of a low-density species on the community outcomes in a model ecosystem.2006
Author(s)
Yoshimura, J., K.Tainaka, K., Suzuki, T., Sakisaka, Y,.Nakagiri, N., Togashi, T., Miyazaki, T.
-
Journal Title
Evolutionary Ecology Research 8(4)
Pages: 629-642
Description
「研究成果報告書概要(欧文)」より
-
[Journal Article] Interspecific separation of habitats in a lattice competition model.2005
Author(s)
Tainaka, K., Kushida, M., Itoh, Y., Togashi, T., Miyazaki, T., Yoshimura, J.
-
Journal Title
Open International Conference on Modeling and Simulation (ed. by Hill, D.R.C, Barra, V. and Traore, M.K.) 2005
Pages: 139-149
Description
「研究成果報告書概要(和文)」より
-
-
[Journal Article] Interspecific separation of habitats in a lattice competition model.2005
Author(s)
Tainaka, K., Kushida, M., Itoh, Y., Togashi, T., Miyazaki, T., Yoshimura, J.
-
Journal Title
Open International Conference on Modeling and Simulation (ed.by Hill, D.R.C, Barra, V., Traore, M.K.) OICMS 2005
Pages: 139-149
Description
「研究成果報告書概要(欧文)」より
-
-
[Journal Article] The Coexistence of Plankton Species with Various Nutrient Conditions : nutrient conditions : A Lattice Simulation Model.2004
Author(s)
Miyazaki, T., Togashi, T., Suzuki, T., Hashimoto, K., Tainaka, Yoshimura, J.
-
Journal Title
iEMSs 2004 International Congress : "Complexity and Integrated Resources Management
Pages: 870-875
Description
「研究成果報告書概要(和文)」より
-
-
[Journal Article] Effects of ammonium concentration and dilution on the competition between the Cyanobacterium Microcystsis novacekii and the green alga Scenedesmus quadricauda.2003
Author(s)
Miyazaki, T., Takeya, K., Togashi, T., Nakagiri, N., Suzuki, T., Yoshimura, J.
-
Journal Title
Modsim2003 International Congress on Modelling and Simulation Proceedings 2003 (Ed. David A. Post)
Pages: 741-746
Description
「研究成果報告書概要(和文)」より
-
[Journal Article] Effects of ammonium concentration and dilution on the competition between the Cyanobacterium Microcystsis novacekii and the green alga Scenedesmus quadricauda.2003
Author(s)
Miyazaki, T., Takeya, K., Togashi, T., Nakagiri, N., Suzuki, T., Yoshimura, J.
-
Journal Title
Modsim2003 International Congress on Modelling and Simulation Proceedings 2003(Ed. David A.Post)
Pages: 741-746
Description
「研究成果報告書概要(欧文)」より
-
-
