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Phylogeography Lee, Jared [1], Mauricio, Rodney [1]. Reconstructing the invasion history of Gambusia affinis into Asia using microsatellites and mitochondrial sequences. Introduced organisms haveincreased in number due to human activities and may have negative environmentaland economic costs earning the title of invasive species. Understanding the invasion history ofthese organisms allows us to study evolutionary processes and provide valuableinformation for the management of introduced organisms. The population genetics of introducedorganisms can leave two broadly distinct patterns. First, introduced populations may show reduced geneticdiversity compared to native populations, typical of populations that haveundergone a bottleneck. Thispattern is indicative of introductions resulting from a single introduction andsingle source population. Alternatively, introduced populations can exhibit the same or increasedgenetic diversity compared to native populations. This pattern suggests that multiple introductions haveoccurred possibly from two or more source populations. While historical records ofintroductions may provide some direct evidence for introductions, not allintroductions may have been recorded, especially in popular, intentionalintroductions. Mosquitofish areone such introduction having been introduced around the world for much of theearly 20th century with a good record of their introductionsexisting. However, due to theirpopularity as a mosquito control agent, their ease of transport, and ability toestablish some introductions may not have been recorded. I reconstruct the invasionhistory of western mosquitofish (Gambusiaaffinis) introduced to Asia using genetic markers as a test of thehistorical record and to detect any unrecorded introductions. I present data from localitiesacross the native and introduced range of G.affinis including the putative source population in Texas and intermediateintroductions that were source populations for later introductions into Taiwan,Japan, and China. Thecombined results of a mitochondrial DNA fragment and 18 microsatellite markerswill be summarized. In essence,all introduced populations in Asia show a reduced number of alleles for eachmicrosatellite locus and only 4 mitochondrial haplotypes compared to the 50haplotypes found throughout the native range. While many introductions demonstrate increased geneticdiversity in the introduced range due to multiple introductions, the patternsobserved in our dataset suggest that one introduction is the main contributorto the introduction of G. affinisinto Asia.
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1 - University of Georgia, Genetics, 120 East Green Street, Davison Life Sciences Complex, Athens, GA, 30602, USA
Keywords:
mosquitofish
bottleneck
invasive.
Presentation Type: Regular Oral Presentation
Session: 130
Location: Peruvian B/Snowbird Center
Date: Tuesday, June 25th, 2013
Time: 9:30 AM
Number: 130005
Abstract ID:127
Candidate for Awards:W.D. Hamilton Award for Outstanding Student Presentation |
