Eur. J. Entomol. 101 (1): 21-27, 2004 | DOI: 10.14411/eje.2004.005

Polyploid spermatozoa in Pityogenes chalcographus and Ips typographus (Coleoptera: Scolytidae)

Erwin FÜHRER
Institute of Forest Entomology, Pathology and Protection, BOKU - University of Natural Resources and Applied Life Sciences, Vienna, Hasenauerstrasse 38, A-1190 Vienna, Austria; e-mail: fuehrer@ento.boku.ac.at

Abnormal spermatogenesis in Pityogenes chalcographus (L.) and Ips typographus (L.) results in oversized spermatozoa in all the populations investigated. They can be identified by light microscopy and classified as 2n up to 16n polyploid. The percentage of polyploid sperm increases when allopatric parents are crossed: Parental populations with less than 1% polyploid, result in male F1 with more than 20% polyploid. Wild populations of P. chalcographus and I. typographus have very different percentages of polyploid sperm. Populations from allochthonous sites for the host tree, Picea abies (Karst.), are distinguished by higher rates of sperm polyploidy than those from autochthonous areas. Thus, it is assumed that polyploid sperm indicates populations originating from the mixing of partially incompatible beetles.

Keywords: Pityogenes chalcographus, Ips typographus, spermatozoa, polyploidy, allopatric crosses, incompatibility

Received: February 17, 2003; Revised: September 10, 2003; Accepted: November 5, 2003; Published: March 25, 2004  Show citation

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FÜHRER, E. (2004). Polyploid spermatozoa in Pityogenes chalcographus and Ips typographus (Coleoptera: Scolytidae). EJE, 101(1), 21-27. doi: 10.14411/eje.2004.005
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