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United States Department of Agriculture

Agricultural Research Service

Research Project: INTEGRATED MANAGEMENT OF IMPORTED FIRE ANTS AND EMERGING URBAN PEST PROBLEMS

Location: Imported Fire Ant and Household Insects

Title: Prevalence of Thelohania Solenopsae Infected Solenopsis Invicta Newly Mated Queens Within Areas of Differing Social Form Distributions

Authors
item Vander Meer, Robert
item Preston, Catherine
item Fritz, Gary - EASTERN ILLINOIS UNIV

Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: August 10, 2005
Publication Date: May 15, 2005
Citation: Vander Meer, R.K., Preston, C.A., Fritz, G.N. 2005. Prevalence of Thelohania solenopsae infected Solenopsis invicta newly mated queens within areas of differing social form distributions. Proceedings in the 2005 Annual Red Imported Fire Ant Conference. 85. Gulfport, MS. March 22-24, 2005.

Technical Abstract: Newly mated queens (NMQs) originating from monogyne red imported fire ant (Solenopsis invicta) colonies and following a mating flight, initiate new colonies by sealing themselves in a nuptial chamber and using stored food reserves to rear their first workers (claustral colony foundation). This method of colony founding is rarely successful for polygyne-derived NMQs, whose low weight critically limits the number of first workers produced. However, this observation may be confounded by the parasitic microsporidium, Thelohania solenopsae, thus far predominately found in association with polygyne colonies. This microsporidium reduces fat reserves within infected queens and may explain why polygyne NMQs are unable to found colonies claustrally. We collected NMQs following mating flights in Gainesville and Ocala, Florida. Newly mated queens were sorted by weight class, then checked for insemination and T. solenopsae infection. Insemination levels were greater than 90% for all weight classes at both collection sites and were not related to infection. Infection levels were lower in Gainesville than Ocala, averaging 1.67% and 14.14%, respectively. Polygyne-derived NMQs collected in Ocala, defined here as weighing ' 12 mg, had the highest infection levels, 25.37% (17/67) in 2003 and 21.43% (6/28) in 2004. Therefore, infection by T. solenopsae cannot be completely responsible for the inability of polygyne NMQs to claustrally establish colonies. This work highlights the need to consider potential parasites and pathogens when collecting fire ant colonies for research.

Last Modified: 7/23/2014
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