Genetic tracks of the invasion of Limnoperna fortunei in South America

GHABOOLI SARA; SYLVESTER FRANCISCO; PAOLUCCI ESTEBAN; SARDIÑA PAULA; LEJEUSNE CHRISTOPHE; CRISTESCU MELANIA; MACISAAC HUGH

Montreal, Canada

Congreso; 16th International Conference on Aquatic Invasive Species.; 2009

<!-- /* Font Definitions */ @font-face {font-family:"Cambria Math"; panose-1:2 4 5 3 5 4 6 3 2 4; mso-font-charset:0; mso-generic-font-family:roman; mso-font-pitch:variable; mso-font-signature:-1610611985 1107304683 0 0 159 0;} /* Style Definitions */ p.MsoNormal, li.MsoNormal, div.MsoNormal {mso-style-unhide:no; mso-style-qformat:yes; mso-style-parent:""; margin:0cm; margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:12.0pt; font-family:"Times New Roman","serif"; mso-fareast-font-family:"Times New Roman"; mso-ansi-language:ES; mso-fareast-language:ES;} .MsoChpDefault {mso-style-type:export-only; mso-default-props:yes; font-size:10.0pt; mso-ansi-font-size:10.0pt; mso-bidi-font-size:10.0pt;} @page Section1 {size:612.0pt 792.0pt; margin:70.85pt 3.0cm 70.85pt 3.0cm; mso-header-margin:36.0pt; mso-footer-margin:36.0pt; mso-paper-source:0;} div.Section1 {page:Section1;} --> Limnoperna fortunei was introduced into South America from South East Asia via shipping vectors, and has since spread to 4 countries. However, details of the route(s), and number of introductions remain unexplored. We obtained Limnoperna samples from 8 introduced locations in South America and 2 native and 7 introduced range populations in Asia, and assayed them for the mitochondrial genetic marker COI. Preliminary analysis showed the Chinese (i.e., native) populations were genetically more diverse than any of the introduced ones, suggesting the occurrence of invasion bottlenecks in all invaded areas. Genetic structure of South American stocks indicates that Argentinean and Uruguayan populations received individuals from at least two sources in Asia. Genetic diversity in Río de la Plata is consistent with at least two introduction events, some of which may have had a large inoculums. During 209, additional sampling will be conducted from other putative sources to provide better resolution of genetic composition in the native range and to identify more precisely the source of South American populations.