Grant-in-Aid for Scientific Research -

Inter- and intracolony variability of coral climate proxies and implication for coral climatology

Grant-in-Aid for Scientific Research(A)

Project Year: 2012.04  -  2015.03 

Investigator(s): SUZUKI Atsushi, SAKAI Kazuhiko, NAKAMURA Takashi, OKAI Takashi, KATO Aki, ZHANG Jing, NAKASHIMA Rei, ISONO Ryosuke, KIKKAWA Takashi, IGUCHI Akira, INOUE Mayuri, MURAYAMA Shohei, HAYASHI Masahiro 

Direct: 37,400,000 (YEN)  Overheads: 48,620,000 (YEN)  Total: 11,220,000 (YEN)

　View Summary

As application of coral-based climate reconstruction has become more frequent at tropical sites, increased attention is being paid to the potential ambiguities of coral thermometers that are intrinsic to the biomineralisation process. Here we studied how the growth rate influenced the skeletal oxygen and carbon isotope ratios and the Sr/Ca ratio in a common-garden experiment involving the long-term culture of Porites australiensis clone colonies. The Sr/Ca ratio was robust against both inter- and intracolony growth-rate variation. The seasonal fluctuation in carbon isotope ratios corresponded to photosynthetic efficiency as measured by pulse-amplitude photometry. These findings support the inference that coral skeletal Sr/Ca and oxygen isotope ratios in a long-lived colony can function as a palaeoclimate archive by recording signals of clonal growth. We also propose practical guidelines for the proper interpretation of coral records.

Inter- and intracolony variability of coral climate proxies and implication for coral climatology

Grant-in-Aid for Scientific Research(A)

Project Year: 2012.04  -  2015.03 

Investigator(s): SUZUKI Atsushi, SAKAI Kazuhiko, NAKAMURA Takashi, OKAI Takashi, KATO Aki, ZHANG Jing, NAKASHIMA Rei, ISONO Ryosuke, KIKKAWA Takashi, IGUCHI Akira, INOUE Mayuri, MURAYAMA Shohei, HAYASHI Masahiro 

Direct: 37,400,000 (YEN)  Overheads: 48,620,000 (YEN)  Total: 11,220,000 (YEN)

　View Summary

As application of coral-based climate reconstruction has become more frequent at tropical sites, increased attention is being paid to the potential ambiguities of coral thermometers that are intrinsic to the biomineralisation process. Here we studied how the growth rate influenced the skeletal oxygen and carbon isotope ratios and the Sr/Ca ratio in a common-garden experiment involving the long-term culture of Porites australiensis clone colonies. The Sr/Ca ratio was robust against both inter- and intracolony growth-rate variation. The seasonal fluctuation in carbon isotope ratios corresponded to photosynthetic efficiency as measured by pulse-amplitude photometry. These findings support the inference that coral skeletal Sr/Ca and oxygen isotope ratios in a long-lived colony can function as a palaeoclimate archive by recording signals of clonal growth. We also propose practical guidelines for the proper interpretation of coral records.

Physio-Ecological study on Scleractinian corals' metabolic adjustability to dynamic environmental changes

Grant-in-Aid for Young Scientists(B)

Project Year: 2012.04  -  2015.03 

Investigator(s): NAKAMURA Takashi 

Direct: 3,700,000 (YEN)  Overheads: 4,810,000 (YEN)  Total: 1,110,000 (YEN)

　View Summary

Ctenactis echinata, as the rare case of "individual" scleractinian coral species, has been selected to explore the potential margin among thermal-stress responses within a population. The greater thermal sensitivities among sexually maturating individuals suggested the trade-off between maintainance and sexual reproduction in this species while stable tolerance were found among larger (older) individuals. In addition, expreiments focused on various life stages of Acropora digitifera such as; planktonic larvae, primarly polyps and mature colonies by cold-water stresses had been conducted. According to the results, niether planktonic larvae and mature colonies were not critically affected by cold stress however, primary polyps' calcification as well as budding rates were significantly suppressed. These results strongly suggest this species ability to survive under marginal region (temperate watar)envrionments is limited by the initial growth suppression.

Inter- and intracolony variability of coral climate proxies and implication for coral climatology

Grant-in-Aid for Scientific Research(A)

Project Year: 2012.04  -  2015.03 

Investigator(s): SUZUKI Atsushi, SAKAI Kazuhiko, NAKAMURA Takashi, OKAI Takashi, KATO Aki, ZHANG Jing, NAKASHIMA Rei, ISONO Ryosuke, KIKKAWA Takashi, IGUCHI Akira, INOUE Mayuri, MURAYAMA Shohei, HAYASHI Masahiro 

Direct: 37,400,000 (YEN)  Overheads: 48,620,000 (YEN)  Total: 11,220,000 (YEN)

　View Summary

As application of coral-based climate reconstruction has become more frequent at tropical sites, increased attention is being paid to the potential ambiguities of coral thermometers that are intrinsic to the biomineralisation process. Here we studied how the growth rate influenced the skeletal oxygen and carbon isotope ratios and the Sr/Ca ratio in a common-garden experiment involving the long-term culture of Porites australiensis clone colonies. The Sr/Ca ratio was robust against both inter- and intracolony growth-rate variation. The seasonal fluctuation in carbon isotope ratios corresponded to photosynthetic efficiency as measured by pulse-amplitude photometry. These findings support the inference that coral skeletal Sr/Ca and oxygen isotope ratios in a long-lived colony can function as a palaeoclimate archive by recording signals of clonal growth. We also propose practical guidelines for the proper interpretation of coral records.

Physio-Ecological study on Scleractinian corals' metabolic adjustability to dynamic environmental changes

Grant-in-Aid for Young Scientists(B)

Project Year: 2012.04  -  2015.03 

Investigator(s): NAKAMURA Takashi 

Direct: 3,700,000 (YEN)  Overheads: 4,810,000 (YEN)  Total: 1,110,000 (YEN)

　View Summary

Ctenactis echinata, as the rare case of "individual" scleractinian coral species, has been selected to explore the potential margin among thermal-stress responses within a population. The greater thermal sensitivities among sexually maturating individuals suggested the trade-off between maintainance and sexual reproduction in this species while stable tolerance were found among larger (older) individuals. In addition, expreiments focused on various life stages of Acropora digitifera such as; planktonic larvae, primarly polyps and mature colonies by cold-water stresses had been conducted. According to the results, niether planktonic larvae and mature colonies were not critically affected by cold stress however, primary polyps' calcification as well as budding rates were significantly suppressed. These results strongly suggest this species ability to survive under marginal region (temperate watar)envrionments is limited by the initial growth suppression.

Physio-Ecological study on Scleractinian corals' metabolic adjustability to dynamic environmental changes

Grant-in-Aid for Young Scientists(B)

Project Year: 2012.04  -  2015.03 

Investigator(s): NAKAMURA Takashi 

Direct: 3,700,000 (YEN)  Overheads: 4,810,000 (YEN)  Total: 1,110,000 (YEN)

　View Summary

Ctenactis echinata, as the rare case of "individual" scleractinian coral species, has been selected to explore the potential margin among thermal-stress responses within a population. The greater thermal sensitivities among sexually maturating individuals suggested the trade-off between maintainance and sexual reproduction in this species while stable tolerance were found among larger (older) individuals. In addition, expreiments focused on various life stages of Acropora digitifera such as; planktonic larvae, primarly polyps and mature colonies by cold-water stresses had been conducted. According to the results, niether planktonic larvae and mature colonies were not critically affected by cold stress however, primary polyps' calcification as well as budding rates were significantly suppressed. These results strongly suggest this species ability to survive under marginal region (temperate watar)envrionments is limited by the initial growth suppression.

Physio-Ecological study on Scleractinian corals' metabolic adjustability to dynamic environmental changes

Grant-in-Aid for Young Scientists(B)

Project Year: 2012.04  -  2015.03 

Investigator(s): NAKAMURA Takashi 

Direct: 3,700,000 (YEN)  Overheads: 4,810,000 (YEN)  Total: 1,110,000 (YEN)

　View Summary

Ctenactis echinata, as the rare case of "individual" scleractinian coral species, has been selected to explore the potential margin among thermal-stress responses within a population. The greater thermal sensitivities among sexually maturating individuals suggested the trade-off between maintainance and sexual reproduction in this species while stable tolerance were found among larger (older) individuals. In addition, expreiments focused on various life stages of Acropora digitifera such as; planktonic larvae, primarly polyps and mature colonies by cold-water stresses had been conducted. According to the results, niether planktonic larvae and mature colonies were not critically affected by cold stress however, primary polyps' calcification as well as budding rates were significantly suppressed. These results strongly suggest this species ability to survive under marginal region (temperate watar)envrionments is limited by the initial growth suppression.

Inter- and intracolony variability of coral climate proxies and implication for coral climatology

Grant-in-Aid for Scientific Research(A)

Project Year: 2012.04  -  2015.03 

Investigator(s): SUZUKI Atsushi, SAKAI Kazuhiko, NAKAMURA Takashi, OKAI Takashi, KATO Aki, ZHANG Jing, NAKASHIMA Rei, ISONO Ryosuke, KIKKAWA Takashi, IGUCHI Akira, INOUE Mayuri, MURAYAMA Shohei, HAYASHI Masahiro 

Direct: 37,400,000 (YEN)  Overheads: 48,620,000 (YEN)  Total: 11,220,000 (YEN)

　View Summary

As application of coral-based climate reconstruction has become more frequent at tropical sites, increased attention is being paid to the potential ambiguities of coral thermometers that are intrinsic to the biomineralisation process. Here we studied how the growth rate influenced the skeletal oxygen and carbon isotope ratios and the Sr/Ca ratio in a common-garden experiment involving the long-term culture of Porites australiensis clone colonies. The Sr/Ca ratio was robust against both inter- and intracolony growth-rate variation. The seasonal fluctuation in carbon isotope ratios corresponded to photosynthetic efficiency as measured by pulse-amplitude photometry. These findings support the inference that coral skeletal Sr/Ca and oxygen isotope ratios in a long-lived colony can function as a palaeoclimate archive by recording signals of clonal growth. We also propose practical guidelines for the proper interpretation of coral records.

Inter- and intracolony variability of coral climate proxies and implication for coral climatology

Grant-in-Aid for Scientific Research(A)

Project Year: 2012.04  -  2015.03 

Investigator(s): SUZUKI Atsushi, SAKAI Kazuhiko, NAKAMURA Takashi, OKAI Takashi, KATO Aki, ZHANG Jing, NAKASHIMA Rei, ISONO Ryosuke, KIKKAWA Takashi, IGUCHI Akira, INOUE Mayuri, MURAYAMA Shohei, HAYASHI Masahiro 

Direct: 37,400,000 (YEN)  Overheads: 48,620,000 (YEN)  Total: 11,220,000 (YEN)

　View Summary

As application of coral-based climate reconstruction has become more frequent at tropical sites, increased attention is being paid to the potential ambiguities of coral thermometers that are intrinsic to the biomineralisation process. Here we studied how the growth rate influenced the skeletal oxygen and carbon isotope ratios and the Sr/Ca ratio in a common-garden experiment involving the long-term culture of Porites australiensis clone colonies. The Sr/Ca ratio was robust against both inter- and intracolony growth-rate variation. The seasonal fluctuation in carbon isotope ratios corresponded to photosynthetic efficiency as measured by pulse-amplitude photometry. These findings support the inference that coral skeletal Sr/Ca and oxygen isotope ratios in a long-lived colony can function as a palaeoclimate archive by recording signals of clonal growth. We also propose practical guidelines for the proper interpretation of coral records.

Grant-in-Aid for Scientific Research on Innovative Areas

Project Year: 2010.04  -   

Direct: 800 (YEN)  Overheads: 0 (YEN)  Total: 800 (YEN)

Grant-in-Aid for JSPS Fellows

Project Year: 2007.04  -  2009.12 

Direct: 2,200 (YEN)  Overheads: 0 (YEN)  Total: 2,200 (YEN)

Grant-in-Aid for JSPS Fellows

Project Year: 2003.04  -  2004.03 

Direct: 1,800 (YEN)  Overheads: 0 (YEN)  Total: 1,800 (YEN)