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The Korean Society of Phycology (한국조류학회(藻類))
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Population Structure and Reproduction of Padina concrescens Thivy(Dictyotales: Phaeophyta) in Southwest Baja California Peninsula, Mexico

  • Rafael, Riosmena-Rodriguez (Programa de Investigacion en Botanica Marina, Departamento de Biologla Marina, Universidad Autonoma de Baja California Sur) ;
  • Consuelo, Ortuno-Aginrre (Programa de Investigacion en Botanica Marina, Departamento de Biologla Marina, Universidad Autonoma de Baja California Sur)
  • Published : 2009.03.01
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Abstract

The brown algae padina concrescens is widely distributed in the northwestern Pacific Mexico. We described the population of P. concrescens based on population parameters such as cover, density and size structure and reproduc-tion at two levels tide at the intertidal area in the southwestern Baja. California Peninsula. Monthly visits from January to December 2003 were done. Both cover and density were measured in situ by quadrants method. Samples were collected to obtain size structure and percentage of reproductive fronds. Our results show there is sparial vari-ation in the population structure more than temporal. Thus, cover and density peak were at different months ineach tide level studied, the lower tide level shows the high values in cover as well as density. The frond develop-ment was observed in height/width ratio this relation was consistent only in the low tidal zone. Size class distribu-tion has consistently small size plants in both tide levels.Reproduction was seasonal in the tide channel but in both tide levels all the reproductive plants were tetrasporophyte. Our results suggest that this population is pseudopere-nial and it strongly as a consequence of the intense competition in the intertidal zone.

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References

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