Molluscan assemblages associated with Gigartina beds in the Strait of Magellan and the South Shetland Islands (Antarctica): a comparison of composition and abundance

  • Sebastián Rosenfeld Laboratorio de Macroalgas Antárticas y Subantárticas, Universidad de Magallanes, Punta Arenas, and Instituto de Ecología y Biodiversidad (IEB), Santiago
  • Cristian Aldea Departamento de Ciencias y Recursos Naturales, Universidad de Magallanes, Punta Arenas, and Programa GAIA-Antártica, Universidad de Magallanes, Punta Arenas
  • Jaime Ojeda Laboratorio de Macroalgas Antárticas y Subantárticas, Universidad de Magallanes, Punta Arenas
  • Johanna Marambio Laboratorio de Macroalgas Antárticas y Subantárticas, Universidad de Magallanes, Punta Arenas, and Instituto de Ecología y Biodiversidad (IEB), Santiago
  • Mathias Hüne Fundación Ictiológica, Santiago
  • Jesús S. Troncoso Departamento de Ecología y Biología Animal, Facultad de Ciencias del Mar, Universidad de Vigo, Vigo
  • Andrés Mansilla Laboratorio de Macroalgas Antárticas y Subantárticas, Universidad de Magallanes, Punta Arenas, and Instituto de Ecología y Biodiversidad (IEB), Santiago

Abstract

In this paper we evaluated the composition and abundance of molluscs associated with beds of the red algae Gigartina, located in the South Shetland Islands (Antarctic Peninsula) and the Strait of Magellan (southern Chile). During the summer season of 2013, samples were obtained by scuba diving using a 0.25 m2 quadrat, arranged randomly within the bed. We extracted a total of 15 quadrats per sampling site. For Antarctic Peninsula beds the most abundant species were the bivalve Lissarca miliaris (233 individuals) and the gastropod Laevilacunaria antarctica (94 individuals), while for Strait of Magellan beds the most abundant species was the polyplacophoran Callochiton puniceus (36 individuals). Comparative analysis between the two molluscan assemblages showed significant differences in the faunal composition between the Antarctic Peninsula and Strait of Magellan (f = 64.474; p = 0.0001). Therefore, molluscs reported in both areas are characteristic of their respective biogeographic area. Finally, Gigartina species play an important role in the formation of patterns of abundance and diversity of the communities associated with them.

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Published
2017-07-17
How to Cite
Rosenfeld, S., Aldea, C., Ojeda, J., Marambio, J., Hüne, M., Troncoso, J., & Mansilla, A. (2017). Molluscan assemblages associated with <em>Gigartina</em&gt; beds in the Strait of Magellan and the South Shetland Islands (Antarctica): a comparison of composition and abundance. Polar Research, 36. Retrieved from https://polarresearch.net/index.php/polar/article/view/2640
Section
Research Articles