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Gametophyte-sporophyte coalescence in populations of the intertidal carrageenophyte Mazzaella laminarioides (Rhodophyta)

  • César Vera
  • Paulina Lobos
  • Héctor Romo
Chapter
Part of the Developments in Applied Phycology book series (DAPH, volume 2)

Abstract

Mazzaella laminarioides has consistently been reported as a typical coalescent/clump species with a triphasic life history of the Polysiphonia-type in which the haploid gametophyte is the predominant phase with respect to the diploid sporophyte. Preliminary observations of intertidal populations revealed that, in some instances, cystocarpic and tetrasporic fronds emerged from the same clump (G-T clumps), implying a coalescent process of haploid and diploid thalli by fusion of their corresponding adjacent basal holdfasts. Population surveys at three sites in Coliumo Bay, central Chile, were carried out to characterize frond demography as well as to asses the frequency of gametophyte-tetrasporophyte (G-T) coalescence. Visual and resorcinol methods were employed to determine the phases of the fronds collected over central transects of 15 randomly sampled clumps. Coalescence of G-T clumps was infrequent, with gametophytes dominating over tetrasporophyte thalli.

Keywords

Frond demography Gametophyte-sporophyte fusion Gigartinaceae Intertidal seaweed 

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References

  1. Garbary DJ, De Wreede RE (1988) Life history phases in natural populations of Gigartinaceae (Rhoodophyta): quantification using resorcinol. In: Lobban CS, Chapman DJ, Kremer BP (eds) Experimental phycology. A laboratory manual. Cambridge University Press, Cambridge, pp 174–178Google Scholar
  2. Hannach G, Santelices B (1985) Ecological differences between the isomorphic reproductive phases of two species of Iridaea. Mar Ecol Prog Ser 22:291–303CrossRefGoogle Scholar
  3. Maggs CA, Cheney DP (1990) Competition studies of marine macroalgae in laboratory culture. J Phycol 26:18–24CrossRefGoogle Scholar
  4. Mansilla A, Navarro N (2003) Contribución a la flora ficológica de Islas Diego Ramírez. In: Mansilla A, Werlinger C, Navarro N (eds) Macroalgas en ambientes subantárticos. Ediciones Universidad de Magallanes, Punta Arenas, pp 85–89Google Scholar
  5. Martínez E, Santelices B (1992) Size hierarchy and −2/3 “Power law” relationship in a coalescent seaweed. J Phycol 28:259–264CrossRefGoogle Scholar
  6. Rosenvinge LK (1931) The marine algae of Denmark, contributions to their natural history. Part IV: Rhodophyceae IV: (Gigartinales, Rhodymeniales, Nemastomatales). K Dan Vidensk Selsk Skr 7,4:489–628Google Scholar
  7. Santelices B (2004) A comparison of ecological responses among aclonal (unitary), clonal and coalescing macroalgae. J Exp Mar Biol Ecol 300:31–44CrossRefGoogle Scholar
  8. Santelices B, Norambuena R (1987) A harvesting method for Iridaea laminarioides in central Chile. Hydrobiologia 151/152:329–333CrossRefGoogle Scholar
  9. Santelices B, Correa JA, Aedo D, Flores V, Hormazábal M, Sánchez P (1999) Convergent biological processes in coalescing Rhodophyta. J Phycol 35:1127–1149CrossRefGoogle Scholar
  10. Santelices B, Aedo D, Hormazábal M, Flores V (2003a) Field testing of inter-and intraspecific coalescence among mid-intertidal red algae. Mar Ecol Progr Ser 250:91–103CrossRefGoogle Scholar
  11. Santelices B, Correa JA, Hormazábal M, Flores V (2003b) Contact responses between spores and sporelings, karyological phases and cystocarps of coalescing Rhodophyta. Mar Biol 141:381–392CrossRefGoogle Scholar
  12. Santelices B, Hormazábal M, Correa J, Flores V (2004) The fate of overgrown germlings in coalescing Rhodophyta. Phycologia 43:346–352CrossRefGoogle Scholar
  13. Thornber CS, Gaines SD (2003) Spatial and temporal variation of haploids and diploids in populations of four congeners of the marine alga Mazzaella. Mar Ecol Progr Ser 258:65–77CrossRefGoogle Scholar
  14. Thornber CS, Gaines SD (2004) Population demographics in species with biphasic cycles. Ecology 85:1661–1674CrossRefGoogle Scholar
  15. Tveter-Gallagher E, Mathieson AC (1980) Sporeling coalescence in Chondrus crispus (Rhodophyceae). J Phycol 12:110–118Google Scholar
  16. Vásquez JA, Vega JMA (2004) Ecosistemas marinos costeros del Parque Nacional Fray Jorge. In: Squeo FA, Gutiérrez JR, Hernández IR (eds) Historia Natural del Parque Nacional Bosque Fray Jorge. Ediciones Universidad de la Serena, La Serena, Capitulo 13:235–252Google Scholar
  17. Westermeier R, Rivera P, Chacana M, Gómez I (1987) Biological basis for the management of Iridaea laminarioides Bory in southern Chile. Hydrobiologia 151/152:313–328CrossRefGoogle Scholar

Copyright information

© Springer Science + Business Media B.V. 2007

Authors and Affiliations

  1. 1.Departamento de OceanografíaUniversidad de ConcepciónConcepciónChile

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