Density, Recruitment, and Shell Growth of Limnoperna fortunei (Mytilidae), an Invasive Mussel in Tropical South America

作者：Belz Carlos E; Darrigran Gustavo^*; Bonel Nicolas; Maeder Netto Otto S

来源：Journal of Freshwater Ecology, 2010, 25(2): 227-233.

DOI：10.1080/02705060.2010.9665072

Limnoperna fortunei (Dunker, 1857) is an invasive freshwater bivalve native to rivers and streams of China and Southeast Asia. In 2001, it was discovered in Itaipu Reservoir, and its population has grown considerably since then. The aim of this study was to estimate density, recruitment, and individual growth of L. fortunei in a subtropical region from a field experiment using an artificial substrate. Samples were collected between December 2004 and December 2005 at Bela Vista Reservoir in Foz do Iguacu, Brazil. Mussels were counted and measured to generate size-frequency and distribution data. Maximum and minimum densities (+/- standard deviation) were 204 +/- 17 ind.100 cm(-2) and 94 +/- 22 ind.100 cm(-2), respectively. Shell length ranged between 1 and 36 mm, and shell length frequency indicated presence of young mussels with variable densities throughout the period surveyed. The von Bertalanffy model fitted successfully in all cases explaining more than 96% of the variation in shell length. Measured growth parameters (k = 2.35 year(-1), L(infinity) = 38 mm) were different from those estimated for populations of L. fortunei in a temperate region.

• 出版日期2010-6