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The value of timber quality forests for insect conservation on Tierra del Fuego Island compared to associated non-timber quality stands

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Abstract

Insect community studies related to forest management focus principally on timber-quality stands, and often omit the remainder of the landscape. This study aimed mainly to compare insect communities of primary timber-quality forests (Nothofagus pumilio) with associated non-timber-quality stands (wetland, edge, riparian and N. antarctica forests), and secondarily to characterize these insect assemblages throughout the growing season and at different vertical strata to evaluate the importance of each habitat type for insect conservation. A total of 18,800 individuals belonging to 231 RTUs (recognizable taxonomic units) were identified, of which Diptera, Hymenoptera, Lepidoptera and Coleoptera were the dominant orders. Lepidoptera RTUs were mostly generalists, while the other main orders were most frequently found in timber-quality forests and included many RTUs with specific environmental requirements. Timber-quality stands had higher richness and abundance than associated non-timber-quality forests and possessed more exclusive species (18%), while 39% of RTUs were shared between all sites. The spatial heterogeneity of timber-quality stands generated different niches and favored insect diversity, which would not have been maintained by protecting non-timber-quality stands alone. Consequently, the proper management of subantarctic Nothofagus forests must include the conservation of timber-quality stands, as protection of non-timber-quality areas alone will not be sufficient for insect conservation at the landscape scale.

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Acknowledgments

Thanks to Sigfrido Wolfsteller of Ushuaia Ranch, Ricardo Vukasovic of Servicios Forestales Consultancy, Centro Austral de Investigaciones Científicas and Universidad Nacional del Sur for their invaluable help and support during the realization of this work. Help in insect family identification was provided by Drs. Sergio Roig-Juñent, Gustavo Flores and María Cecilia Domínguez (CRICYT-CONICET). We are also grateful to Guillermo Fassi of Lenga Patagonia S.A. for permission to access their climate databases. C.B. Anderson acknowledges the post-doctoral fellowship awarded by the Institute of Ecology and Biodiversity (ICM P05–002; http://www.ieb-chile.cl).

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Authors and Affiliations

  1. Centro Austral de Investigaciones Científicas (CONICET), CADIC, cc 92, 9410, Ushuaia, Tierra del Fuego, Argentina

    María Vanessa Lencinas & Guillermo Martínez Pastur

  2. Omora Ethnobotanical Park, University of Magallanes, Puerto Williams, Chile

    Christopher B. Anderson

  3. Institute of Ecology and Biodiversity, Casilla 653, Santiago, Chile

    Christopher B. Anderson

  4. Centro de Recursos Naturales Renovables de la Zona Semiárida (CONICET), Bahía Blanca, Argentina

    Carlos Busso

  5. Departamento de Agronomía, Universidad Nacional del Sur, Bahía Blanca, Argentina

    Carlos Busso

Authors
  1. María Vanessa Lencinas
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  2. Guillermo Martínez Pastur
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  3. Christopher B. Anderson
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  4. Carlos Busso
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Correspondence to María Vanessa Lencinas.

Appendix

Appendix

Annex 1 A complete list of the taxa found during the study (part 1)
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Annex 2 A complete list of the taxa found during the study (part 2)
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Annex 3 Recognizable Taxanomic Unit (RTU) rarity
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Lencinas, M.V., Martínez Pastur, G., Anderson, C.B. et al. The value of timber quality forests for insect conservation on Tierra del Fuego Island compared to associated non-timber quality stands. J Insect Conserv 12, 461–475 (2008). https://doi.org/10.1007/s10841-007-9079-4

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