Polar Biology

, Volume 35, Issue 1, pp 39–51 | Cite as

Birds as marine–terrestrial linkages in sub-polar archipelagic systems: avian community composition, function and seasonal dynamics in the Cape Horn Biosphere Reserve (54–55°S), Chile

Original Paper

Abstract

Marine environments are known to affect adjacent terrestrial biotic communities. In South America’s sub-Antarctic archipelago, birds are the most abundant and diverse terrestrial vertebrate assemblage. We hypothesized that birds would reflect a marine influence that would gradually decrease inland, expecting to find greater species richness, abundance, and biomass near the sea with decreases toward the island interior. We seasonally compared these parameters, with identified indicator species and assessed functional groups at 0, 150, and 300 m from the coast. Unexpectedly, we found a marked marine (0) and terrestrial (150–300) patterns for avian assemblages, rather than a gradient. In addition, seasonal patterns were warm (spring–summer) and cold (autumn–winter). The only parameter that displayed a true gradient was avian biomass in spring. During the cold season, higher values were observed in all variables for coastal assemblages, compared to inland sites. In the warm season, abundance and richness of coastal and terrestrial assemblages were similar, owing to migratory species. Milvago chimango was the only species abundant and frequent in both terrestrial and coastal systems, thereby indicating potential as a marine–terrestrial vector. Functionally, coastal assemblages were conformed of herbivores, carnivores, and scavengers, while terrestrial communities were made up of omnivores and insectivores. We conclude that the sea coast is a unique habitat in this archipelago, providing refuge for both marine and terrestrial sub-Antarctic birdlife particularly in the cold season. The relevance of the land/sea ecotone is poorly known, but important is given to high demand for the installation of salmon aquaculture facilities along the southern Chilean coastline.

Keywords

Sub-Antarctic avifauna Ecotone Milvago chimango Trans-ecosystemic links 

Supplementary material

300_2011_1029_MOESM1_ESM.pdf (115 kb)
Supplementary material 1 (PDF 114 kb)
300_2011_1029_MOESM2_ESM.pdf (139 kb)
Supplementary material 2 (PDF 138 kb)

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • J. C. Pizarro
    • 1
    • 2
    • 3
    • 4
    • 5
  • C. B. Anderson
    • 1
    • 2
    • 3
    • 4
    • 5
  • R. Rozzi
    • 1
    • 2
    • 3
    • 4
    • 5
  1. 1.Omora Ethnobotanical ParkUniversidad de MagallanesPuerto Williams, Cape Horn Biosphere ReserveChile
  2. 2.Master’s of Science Program in Management and Conservation of Sub-Antarctic Ecosystems, Faculty of ScienceUniversidad de MagallanesPunta ArenasChile
  3. 3.Institute of Ecology and BiodiversitySantiagoChile
  4. 4.Sub-Antarctic Biocultural Conservation Program, Departments of Philosophy & Religion Studies and Biological SciencesUniversity of North TexasDentonUSA
  5. 5.Puerto Williams University CenterUniversidad de MagallanesPuerto WilliamsChile

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