Pusch, K. and Heinze, J. and Foitzik, S. (2006) The influence of hybridization on colony structure in the ant species Temnothorax nylanderi and T. crassispinus. Insectes Sociaux 53 (4), pp. 439-445.
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The parapatric sibling ant species Temnothorax nylanderi and T. crassispinus hybridize in the contact zone in the Franconian Jura, Southern Germany. Aim of our study was to investigate the impact of hybridization on colony composition and fitness. We classified colonies as either ‘pure’ or containing hybrids by determining their allozyme pattern at GPI, an enzyme that is fixed for different alleles in the two parental species, and quantified their reproductive output. Most colonies with hybrid workers had a T. crassispinus queen. Colonies with heterozygous, hybrid workers produced more young workers than colonies of the parental species but similar numbers of male and female sexuals. Female sexuals from colonies with heterozygous workers had a significantly lower weight than female sexuals from pure colonies. Only a single reproductive queen was found to be heterozygous, suggesting reduced fitness of hybrid queens. As in the parental species, hybrid colonies appear to be frequently taken over by alien queens, which obscures the genetic colony structure.
|Institutions:||Biology, Preclinical Medicine > Institut für Zoologie|
|Keywords:||Contact zone; sibling species; hybridization; reproductive investment|
|Subjects:||500 Science > 570 Life sciences|
500 Science > 590 Zoological sciences
|Refereed:||Yes, this version has been refereed|
|Created at the University of Regensburg:||Unknown|
|Deposited On:||29 Jan 2009 17:20|
|Last Modified:||13 Mar 2014 10:36|