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COMPETITION STUDIES OF MARINE MACROALGAE IN LABORATORY CULTURE

1990; Wiley; Volume: 26; Issue: 1 Linguagem: Inglês

10.1111/j.0022-3646.1990.00018.x

1529-8817

Christine A. Maggs, Donald P. Cheney,

Marine Biology and Ecology Research

Journal of PhycologyVolume 26, Issue 1 p. 18-24 COMPETITION STUDIES OF MARINE MACROALGAE IN LABORATORY CULTURE Christine A. Maggs, Christine A. Maggs Department of Biology, Queen's University of Belfast, Belfast, Northern Ireland BT7 INNSearch for more papers by this authorDonald P. Cheney, Corresponding Author Donald P. Cheney Biology Department, Northeastern University, Boston, Massachusetts 02115Address for reprint requests.Search for more papers by this author Christine A. Maggs, Christine A. Maggs Department of Biology, Queen's University of Belfast, Belfast, Northern Ireland BT7 INNSearch for more papers by this authorDonald P. Cheney, Corresponding Author Donald P. Cheney Biology Department, Northeastern University, Boston, Massachusetts 02115Address for reprint requests.Search for more papers by this author First published: March 1990 https://doi.org/10.1111/j.0022-3646.1990.00018.xCitations: 44 D.P.C. would like to thank Arthur Mathieson for his support of the Chondrus work. Cliff Duke for help with Gracilaria studies and John van tier Meet for green mutants of both genera. G.A.M. gratefully acknowledges helpful discussions with Hugh Fletcher and Matthew Dring. Question (Paine): Performance could be measured, at the least, as thallus mortality, reproductive output or growth rate. If laboratory generated plants were outplanted to a variety of natural (field) conditions, what differences in these factors would you expect to observe in homokaryotic versus heterokaryotic plants? Answer: We have no evidence as to the significance, even in culture, of the formation of heterokaryotic cells and chimeric fronds. Until there is some understanding of the role of multiple nuclei, including those of different genotypes, no theoretical prediction can be made. Question (Carpenter): Within an algal species, is there evidence for more frequent sporeling or holdfast coalescence in particular physical or biological environments, such as across a desiccation gradient or in environments with high versus low grazer abundance, that would give genotypes that coalesce a physiological or deterrent advantage? Answer: It is notable that red algae with extensive crustose holdfasts, such as Chondrus crispus, Ahnfeltia plicata and Mastocarpus stellatus, are among the most characteristic species in habitats subject to both severe grazing and mechanical disturbance. It seems likely that their success is related partly to their formation or coalesced holdfast groups because extensive holdfasts are important in these environments, and coalescence leads to a rapid increase in holdfast area. 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