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Space-time variation of the relative abundance of Limnoperna fortunei in deep zones of S?o Gon?alo Channel, Rio Grande do Sul, Brazil

DOI: 10.1590/S0073-47212012005000006

Keywords: freshwater invasion, frequency of sizes, golden mussel, bivalve.

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Abstract:

this work describes the spatial-temporal variation of the relative abundance and size of limnoperna fortunei (dunker, 1857) collected in s?o gon?alo channel through bottom trawl with a 0.5 cm mesh, at depths between 3 and 6 m. the estimative of mean relative abundance (cpue) ranged from 2,425.3 individuals per drag (ind./drag) in the spring to 21,715.0 ind./drag in the fall, with an average of 9,515.3 ind./drag throughout the year. the estimated mean density of l. fortunei for the deep region of s?o gon?alo channel ranged from 1.2 to 10.3 ind./m2, and it was recorded a maximum density of 84.9 ind./m2 in the fall of 2008. the method of sampling using bottom trawl enabled the capture of l. fortunei under the soft muddy bottom of the channel, in different sizes ranging from 0.4 to 3.2 cm. this shows that the structure of the l. fortunei adult population under the bottom of the s?o gon?alo channel is composed mostly of small individuals (<1.4 cm), which represent up to 74% of the population collected.

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