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PHOTOSYNTHETIC PHYSIOLOGY AND CHEMICAL COMPOSITION OF SPORES OF THE KELPS MACROCYSTIS PYRIFERA, NEREOCYSTIS LUETKEANA, LAMINARIA FARLOWII, AND PTERYGOPHORA CALIFORNICA (PHAEOPHYCEAE)1
Article first published online: 27 OCT 2004
Journal of Phycology
Volume 27, Issue 1, pages 26–34, February 1991
How to Cite
Amsler, C. D. and Neushul, M. (1991), PHOTOSYNTHETIC PHYSIOLOGY AND CHEMICAL COMPOSITION OF SPORES OF THE KELPS MACROCYSTIS PYRIFERA, NEREOCYSTIS LUETKEANA, LAMINARIA FARLOWII, AND PTERYGOPHORA CALIFORNICA (PHAEOPHYCEAE). Journal of Phycology, 27: 26–34. doi: 10.1111/j.0022-3646.1991.00026.x
Received 15 June 1990. Accepted 1 October 1990.
We are very grateful to B. Prézelin for encouragement and advice on the photosynthesis studies and for allowing us to use much of her equipment. B. Sweeney offered procedural advice and was gracious in coordinating equipment use; she is deeply missed. A. Matlick provided invaluable assistance with oxygen measurements and data analysis. M. Amsler helped greatly with chlorophyll and CHN determinations. R. Jameson of the U.S. Fish and Wildlife Service provided access to Piedras Blancas. The manuscript was improved based on comments by D. Fork, R. Holmes, B. Prézelin, D. Reed, R. Zimmerman, an anonymous reviewer, and the editor. Numerous divers assisted with collections, particularly M. Amsler, C. Darrow, D. Laur, D. Martin, and D. Reed. S. Lindley analyzed one pigment sample of Laminaria. Preliminary work was supported by a grant-in-aid from Sigma Xi to C.D.A.
- Issue published online: 27 OCT 2004
- Article first published online: 27 OCT 2004
- chemical composition;
- maternal investment;
Recently released spores of the kelps Macrocystis pyrifera (L.) C. Ag., Nereocystis luetkeana (Mert.) Post. and Rupr., Laminaria farlowii Setch., and Pterygophora californica Rupr. had different levels of net photosynthesis. Spore-specific photosynthesis–irradiance relationships were similar in many respects for M. pyrifera, N. luetkeana, and L. farlowii spores. All three species had low rates of net light-saturated photosynthesis. In contrast, spores of P. californica had higher photosynthetic potential and overall net photosynthesis than the other three species. On a cell carbon basis, however, photosynthetic rates in N. luetkeana spores were similar to those of P. californica spores and higher than those of M. pyrifera spores. Chlorophyll a content of spores varied 10-fold among species. The rank order of significant differences in chlorophyll a content was P. californica > L. farlowii > N. luetkeana > M. pyrifera. As a result, chlorophyll-specific measurements suggest M. pyrifera and N. luetkeana spores had much higher quantum efficiency and photosynthetic potential than either P. californica or L. farlowii spores. Maternal carbon and nitrogen investment significantly differed in spores of M. pyrifera, N. luetkeana, and P. californica with P. californica > M. pyrifera > N. luetkeana. Carbon content in spores of each of these three species increased by about 30% during 12 h of saturating irradiance. We suggest that the photosynthetic capabilities of and maternal investment in spores may be related to the spore as a unit of dispersal, to the reproductive ecology of the parental sporophytic stages, and to the growth and physiology of the germling gametophyte stages.