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The Korean Society of Phycology (한국조류학회(藻類))
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Morphological variability of intertidal Eisenia arborea (Laminariales, Ochrophyta) at Punta Eugenia, Baja California Sur

  • Parada, Gloria M. (Casilla 102) ;
  • Riosmena-Rodriguez, Rafael (Programa de Investigacion en Botanica Marina, Universidad Autonoma de Baja California Sur) ;
  • Martinez, Enrique A. (Centro de Estudios Avanzados en Zonas Aridas (CEAZA) Universidad de La Serena, Raul Bitran s/n, Colina El Pino, La Serena, Chile and PhD Program on Applied Biology and Ecology, Facultad de Ciencias del Mar, Universidad Catolica del Norte) ;
  • Hernandez-Carmona, Gustavo (Centro Interdisciplinario de Ciencias Marinas, Av. Instituto Politecnico Nacional s/n)
  • Received : 2011.12.17
  • Accepted : 2012.05.06
  • Published : 2012.06.15
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Abstract

Water motion is one of the main drivers in morphological variability in species within de order Laminariales, and most of our current knowledge is based on subtidal populations. $Eisenia$ $arborea$ is a dominant kelp species in the North Pacific, widely distributed along the Baja California Peninsula from mid intertidal down to subtidal areas. This species presents great variability in the intertidal zone but it has not been yet evaluated such variability according to wave exposure. The present work also identifies the spatial / temporal variation, particularly respect to the presence of stipes without medulla (hollow stipes) a feature common among other brown seaweeds. We evaluated the effects of wave action in morphological variation of intertidal $Eisenia$ $arborea$ (Laminariales, Ochrophyta) at Punta Eugenia. The spatial and temporal variation sampling was surveyed between February, May, July, and August 2004 in the intertidal of Punta Eugenia, Baja California Sur. Our results have shown that exposed sites correlate with increased length and width of stipes as compared to more protected sites. Hollow stipes frequency changed more in association with temporal variation than with spatial heterogeneity suggesting nutrient limitation for thalli development. Our results suggest that $Eisenia$ $arborea$ compensate by morphological modifications the stress of living in the intertidal zone by showing larger stipes. Hollow stipes might be are also a mechanical adaptation to increase survival in high energy environments.

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References

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