Situación de la fauna entomológica en Puerto Espora , Tierra del Fuego, luego de la contaminación provocada por el petróleo del B/T Metula. I.- Entomofauna suelo- superficial
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1979
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Se presenta la composición y análisis cuantitativo de la entomofauna del estrato suelo-superficial colectada durante un año (1977) junto a la entrada de mar noreste en Puerto Espora, Tierra del Fuego. En la marisma intensamente contaminada aún por petróleo, no se encontraron insectos. Se muestrearon dos sectores adyacentes, uno de los cuales (A) está ligeramente contaminado. El otro (B) presenta típicas características este parias. El sector A es más complejo, con un 24% de especies exclusivas. Pero un 66% de especies comunes a ambos sectores configura una estructura básica común, que origina tendencias similares al analizar algunos parámetros. Se concluye que los factores climáticos son determinantes en la actividad específica. El petróleo y las inundaciones periódicas durante las mareas parecen incidir solamente en las densidades y en el establecimiento definitivo de las especies accidentales, puesto que la constancia temporal y la abundancia relativa de la mayor parte de las especies se mantiene.
The composition and quantitative analysis of soil-surface insect fauna collected along one year (1977) in Puerto Espora, Tierra del Fuego is presented. In the still heavily contaminated saltmarsh, there were no insects. Two adyacent sectors were sampled, one of them (A) was just lightly oiled. The other (B) was a typical steppe without oil. The sector A is more complex, with a 24% of exclusive species. But a 66% of common species to both sectors form a basical common structure wich origine similar tendences when some parameters are analized. It is concluded that climatic factors are determinant in the specific activity, whyle the oil and periodic floods tides, affect only the density and setling of the accidental species, since the temporal constancy and the relative abundance of most of the species remain the same.
The composition and quantitative analysis of soil-surface insect fauna collected along one year (1977) in Puerto Espora, Tierra del Fuego is presented. In the still heavily contaminated saltmarsh, there were no insects. Two adyacent sectors were sampled, one of them (A) was just lightly oiled. The other (B) was a typical steppe without oil. The sector A is more complex, with a 24% of exclusive species. But a 66% of common species to both sectors form a basical common structure wich origine similar tendences when some parameters are analized. It is concluded that climatic factors are determinant in the specific activity, whyle the oil and periodic floods tides, affect only the density and setling of the accidental species, since the temporal constancy and the relative abundance of most of the species remain the same.
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Entomofauna, Puerto Espora, Contaminación petrolífera, B/T Metula
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Anales del Instituto de la Patagonia, Vol. 10, pp. 209 - 218, 1979.