Space-time variation of the relative abundance of Limnoperna fortunei in deep zones of São Gonçalo Channel, Rio Grande do Sul, Brazil

Abstract

ABSTRACT. This work describes the spatial-temporal variation of the relative abundance and size of Limnoperna fortunei (Dunker, 1857) collected in São Gonçalo 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 São Gonçalo Channel ranged from 1.2 to 10.3 ind./ m 2 , and it was recorded a maximum density of 84.9 ind./m 2 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 São Gonçalo Channel is composed mostly of small individuals (<1.4 cm), which represent up to 74% of the population collected.

Distribution, tolerance, growth, behaviour and control methods of Limnoperna fortunei (Dunker, 1857) (Bivalvia: Mytilidae): A review

“…Among larvae collected, the D‐shaped and veliger forms accounted for the largest proportion. Lopes & Vieira (2012) reported the spatial–temporal variation of L. fortunei in São Gonçalo Channel in Brazil by sampling seasonally via bottom trawl at 3 ~ 6‐metre depths. They suggested that the evaluated average density of L. fortunei in the deeper areas of the channel was 1.2 to 10.3 ind./m 2 , with a maximum density of 84.9 ind./m 2 in autumn.…”

Density of Limnoperna fortunei larval stages in a cascade of subtropical reservoirs: spatiotemporal variation and environmental influences

“…The golden mussel has shown great dispersal potential in Brazil, and its presence has already caused substantial impacts on community structures and ecosystem functioning (Lopes et al, 2009;Lopes & Vieira, 2012) as well as economic damage (Darrigran et al, 2020) in the region. The rst occurrence of L. fortunei in Brazil dates back to 1999 (Mansur et al, 1999).…”