INVESTIGADORES
LENCINAS Maria Vanessa
congresos y reuniones científicas
Título:
Variable retention as strategy to protect insect diversity in managed South Patagonian forests
Autor/es:
LENCINAS, MV; MARTÍNEZ PASTUR, G
Lugar:
Edmonton
Reunión:
Congreso; 24th International Congress for Conservation Biology: Conservation for a Changing Planet; 2010
Institución organizadora:
Society for Conservation Biology
Resumen:
Traditional silviculture affects insect diversity of
old-growth forests. Over the last decade, however, variable retention has been
proposed as a strategy to mitigate species losses. We compared insect diversity
in Nothofagus pumilio forests managed with variable retention and traditional
forestry during the first four years after harvesting. Adult insects were sampled
through a wide spectrum traps (pit-fall, alcohol, lights and color trays) set
in managed (aggregated retention, variable retention and dispersed retention)
and unmanaged stands. Richness and relative abundance were analyzed with
classification and ordination using NMS, PERMANOVA and PERMDISP. A total of 282
morphospecies were identified, mainly in the orders Diptera, Coleoptera,
Lepidoptera and Hymenoptera. Richness and relative abundance trend to decrease
in harvested forests compared to the unmanaged ones, depending on the level of
habitat damage and time after harvesting. Multivariate analyses showed
similarities between unmanaged stands and aggregated retention areas, however,
great dissimilarities were observed among the years. Introduced species from
other environments were higher in harvested than in retained areas. Variable
retention conserved insect diversity better than aggregated retention or
traditional forestry (dispersed retention or clear-cuts) by maintaining
old-growth forest diversity inside the aggregates and decreasing the impact of
forestry in the harvested areas.