Abstract:
:Larvae of the black fly morphospecies Simulium vittatum from Colorado, Montana, Nebraska, and New Hampshire were cytologically identified as either the IS-7 or the IIIL-1 cytospecies. DNA was PCR amplified from cytotyped larvae using eight 10-mer primers, labeled with 33P, and run on polyacrylamide gels. The entire data set of 96 amplicons produced incomplete separation of the two cytospecies when subjected to neighbor-joining and maximum parsimony analyses. However, when analyzed within geographical regions, separate species status was supported. Bootstrap support for distinctness of the two cytospecies was best in Colorado where they were collected in true sympatry. The IS-7 cytospecies was more polymorphic in the western states, where it differed most from IIIL-1, which was most variable in the eastern states. The frequencies of the 17 most common amplicons in the two cytospecies were inversely correlated. A model of speciation derived from the molecular evidence suggests that IS-7 evolved in the west and spread eastward, whereas IIIL-1 later originated in the east and spread westward.
journal_name
Genomejournal_title
Genomeauthors
Duncan GA,Adler PH,Pruess KP,Powers TOdoi
10.1139/g03-144subject
Has Abstractpub_date
2004-04-01 00:00:00pages
373-9issue
2eissn
0831-2796issn
1480-3321pii
g03-144journal_volume
47pub_type
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