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Community Ecology

, Volume 16, Issue 1, pp 55–65 | Cite as

Habitat-specific vegetation and seasonal drivers of bird community structure and function in southern Patagonian forests

  • G. M. Pastur
  • M. V. Lencinas
  • E. Gallo
  • M. de Cruz
  • M. L. Borla
  • R. S. Esteban
  • C. B. AndersonEmail author
Article

Abstract

Biodiversity conservation requires knowledge about the factors that influence the structure and function of biotic assemblages. In southern Patagonian Nothofagus forests, birds are the most abundant and diverse vertebrates and are known to have different requirements for nesting, breeding and feeding. Therefore, we chose this group to analyze key drivers of avian community dynamics; for conservation purposes, this information is requisite to manage Nothofagus forest landscapes and their associated biota. We first characterized forest structure and understory floristic composition in open and closed canopy broadleaved forests of mixed deciduous (MD) and mixed deciduous-evergreen (MDE) species on the southern coast of Tierra del Fuego National Park, Argentina. For each habitat, bird assemblages were assessed using point counts, checklists and mistnetting. We used ANOVAs and multivariate methods to analyze changes in bird species richness, density, and biomass as a function of habitat and seasonal characteristics. Forest structure and understory plant communities influenced avian assemblage and density; MDE forests had significantly greater species richness, but lower density than MD. Plus, particular species were associated with specific understory conditions, such as Anairetes parulus and Zonotrichia capensis whose presence was related to shrubs. Additionally, variations observed between seasons apparently were related to differential uses of each habitat type during certain times of year. Finally, it was not possible to define a single forest type with greater conservation value for birds; each had a specific bird species assemblage. Consequently, our results suggest the importance of a full representation of habitats to preserve the region’s bird diversity, which also has been described for forest invertebrates and understory plants.

Keywords

Diversity Nothofagus Tierra del Fuego National Park Trophic ecology Sub-Antarctic forests 

Nomenclature

Clements (2008) 

Abbreviations

BA

Total Basal Area

CAR

Carnivore

CC

Canopy Cover

CCA

Canonical Correspondence Analysis

CL

Closed

D

Density

DCA

Detrended Correspondence Analysis

DH

Dominant Height

HER

Herbivore

INS

Insectivore

LAI

Leaf Area Index

MD

Mixed of Deciduous species

MDE

Mixed of Deciduous and Evergreen species

QMD

Quadratic Mean Diameter

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© Akadémiai Kiadó, Budapest 2015

This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

Authors and Affiliations

  • G. M. Pastur
    • 1
  • M. V. Lencinas
    • 1
  • E. Gallo
    • 2
  • M. de Cruz
    • 3
  • M. L. Borla
    • 3
  • R. S. Esteban
    • 1
  • C. B. Anderson
    • 1
    • 4
    Email author
  1. 1.Centro Austral de Investigaciones Científicas (CADIC-CONICET)UshuaiaArgentina
  2. 2.Parque Nacional Tierra del Fuego (APN)UshuaiaArgentina
  3. 3.Magellanic Nature ToursUshuaiaArgentina
  4. 4.Universidad Nacional de Tierra del FuegoUshuaiaArgentina

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