Instrumental insemination of Apis mellifera queens with hetero- and conspecific spermatozoa results in different sperm survivalMananya Phiancharoena, Siriwat Wongsiria, Nikolaus Koenigerb and Gudrun Koenigerb
a Center of Excellence in Entomology: Bee Biology, Biodiversity of Insects and Mites, Department of Biology, Faculty of Science, Chulalongkorn University, Bangkok 10330, Thailand
b Institut für Bienenkunde (Polytechnische Gesellschaft), Fachbereich Biologie und Informatik der J.W. Goethe Universität Frankfurt am Main, Karl-von-Frisch-Weg 2, 61440 Oberursel, Germany
(Received 21 October 2003; revised 11 January 2004; accepted 31 January 2004)
Abstract - Sixty three queens of Apis mellifera were inseminated each with about 8 million spermatozoa from either 1 A. mellifera drone, 8 A. cerana, 5 A. dorsata or 20 A. florea drones. Spermatozoa were collected from vesiculae seminales, diluted in buffer and re-concentrated at 1,000 g for 10 minutes. Between 1.4% and 2.8% of the spermatozoa reached the spermatheca. Motility of spermatozoa of A. mellifera and A. cerana did not change within 4 weeks, it was nearly 100%. The motility of A. florea spermatozoa decreased to 83.4% after 3 days and to 33.9% after 4 weeks and motility of A. dorsata spermatozoa decreased to 61.2% after 3 days and to 26% after 4 weeks. Fertilization of A. mellifera eggs was 57% by A. mellifera spermatozoa. Calculation based on non-hatching eggs showed that about 40% were fertilized by A. cerana and A. florea and less than 20% by A. dorsata spermatozoa. The composition of spermathecal fluid seems to be different within the species and its significance for long term sperm storage is discussed.
Key words: sperm survival / spermathecal fluid / hetero specific insemination / Apis mellifera queens / Apis species
Corresponding author: Gudrun Koeniger Gudrun.Koeniger@em.uni-frankfurt.de
© INRA, EDP Sciences, DIB, AGIB 2004