Estudios entomofaunísticos en el archipiélago del Cabo de Hornos. 1.- Prospección preliminar de suelo-superficie en Caleta Lientur (Isla Wollaston)
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1980
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Se presentan algunas consideraciones derivadas del análisis de la entomofauna de suelo-superficie, capturada en comunidades de turbal y de bosque en Caleta Lientur (Isla Wollaston). Se colectaron 246 insectos que corresponden a 5 órdenes, 22 familias y 41 especies. Un 41,5% de estas especies son constantes en el área muestreada, y de ellas, el 35,3% son también dominantes. El resto está constituido por especies ocasionales, por lo general exclusivas de alguna de las situaciones prospectadas. Esta estructura refleja valores altos de diversidad y baja sobreposición general en tanto los índices de similitud acusan una mayor concordancia entre los muestreos provenientes de laderas de igual exposición. Las condiciones edáficas y el mejor desarrollo y cobertura vegetacional son los factores que posibilitan el asentamiento de las comunidades de insectos, en cambio se revela como poco significativa la influencia del viento y la insolación.
Some considerations derived from the analysis of soil-surface entomofauna collected on bog and woodland communities at Caleta Lientur (Isla Wollaston) are presented. 246 insects in 5 orders, 22 families and 41 species were collected. 41.5% of the species in the sample are constant in the whole study area, out of which 35.3% are also dominant. The rest of the species are only of occasional occurrence and generally exclusive of some of the situations surveyed. All of this reflects high diversity and low overlapping, while cluster analysis shows more similarity bet ween samples from areas with the same exposure. The edaphic conditions and a better vegetational development and coverage are factors which permit the establishment of the insects communities, instead the wind and insolation influences are insignificant.
Some considerations derived from the analysis of soil-surface entomofauna collected on bog and woodland communities at Caleta Lientur (Isla Wollaston) are presented. 246 insects in 5 orders, 22 families and 41 species were collected. 41.5% of the species in the sample are constant in the whole study area, out of which 35.3% are also dominant. The rest of the species are only of occasional occurrence and generally exclusive of some of the situations surveyed. All of this reflects high diversity and low overlapping, while cluster analysis shows more similarity bet ween samples from areas with the same exposure. The edaphic conditions and a better vegetational development and coverage are factors which permit the establishment of the insects communities, instead the wind and insolation influences are insignificant.
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Entomofauna, Isla Wollaston, Caleta Lientur
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Anales del Instituto de la Patagonia, Vol. 11, pp. 281-291, 1980.