Seasonal variation in larval density of Limnoperna fortunei (Bivalvia, Mytilidae) in the Iguacu and Parana rivers, in the region of Foz do Iguacu, Parana, southern Brazil

摘要

The larval density of the invasive mussel Limnoperna fortunei (Bivalvia, Mytilidae) was monitored from January 2005 to February 2006 at two points along the Parana and the Iguacu Rivers, near Foz do Iguacu, PR, Brazil. The results indicated two density peaks in the Parana River: a lower peak between March and June and a higher peak in October. In the Iguacu River, the values were much lower, yet they also showed a peak between September and October. A reduction in the reproductive activity was observed in both the rivers between July and August. The average larval density at the collection point in the Parana reached 948.5 larvae/m(3), with a peak of 2,999.5 larvae/m(3) in October. The present study represented the first quantification of the larval density of L. fortunei in the lower reaches of the Iguacu River, downstream of the Iguacu falls.