Das Leibniz-Institut zur Analyse des Biodiversitätswandels

ist ein Forschungsmuseum der Leibniz Gemeinschaft

Pre- and postcopulatory sexual selection in Threespine Stickleback.

Termin: 
Do, 05.11.2015 - 17:15 Uhr
Ort: 
Hörsaal
Veranstaltungsart: 
Vortrag
Veranstaltungsreihe: 
Biologisches/Evolutionsbiologisches Kolloquium
Zielgruppe: 
Studierende
Vortragende / Vortragender: 
Prof. Dr. Theo C. M. Bakker, University of Bonn

ACHTUNG: Der Vortrag wird in englischer Sprache gehalten!

The Threespine Stickleback male with its conspicuous sexual traits, is a well-known model for pre-copulatory sexual selection. Threespine Stickleback are also often engaged in sneak fertilizations, inducing sperm competition and post-copulatory sexual selection.

Questions: Is there functional variation in sperm traits (sperm morphology, swimming speed) as expected from sperm competition theory? How do pre- and post-copulatory sexual selection interact?

Recent advances have been made in understanding functional variation in Stickleback sperm traits. Sperm with a longer tail and a smaller head-to-tail-length ratio swam faster but did not live as long. In sperm competition experiments with equal sperm numbers of rival males, head-to-tail-length ratio of a male’s sperm determined paternity. When one of the two rivals ejaculated more sperm or ejaculated before the other male, his paternity share increased. Relatedness only influenced pre-copulatory sexual selection. Sperm traits correlated with breeding coloration. There are some intriguing links between pre- and post-copulatory sexual selection. Attractive males produced relatively more sons than duller males. Under food restriction, sperm swimming speed and coloration were traded off.

I will start my presentation by discussing a more fundamental level of sexual selection and present an experiment on environmental sex reversal in Threespine Stickleback.

 

Ansprechpartnerin / Ansprechpartner

Sektionsleiterin
+49 228 9122-241
+49 228 9122-295
h.waegele [at] leibniz-zfmk.de

Biologisches Kolloquium

Prof. Dr. H. Wägele
Zoologisches Forschungsmuseum Alexander Koenig,
Adenauerallee 160, 53113 Bonn
 
Prof. Dr. G. von der Emde
Institut für Zoologie, Poppelsdorfer Schloss,
Meckenheimer Allee 169, 53115 Bonn
 
Ort: Großer Hörsaal, Poppelsdorfer Schloß
Zeit: montags, 17.15 Uhr
 

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