Limnetic Stickleback

Data Sheet 9

Mate choices of limnetic females

(Vamosi and Schluter 1999)



Hybrid (F1) males released in the wild have been observed to build nests in open areas lacking vegetation cover, similar to the areas selected by limnetic males. This means that hybrid males in the wild would likely encounter limnetic females, who look for potential mates in such areas.
 
Enclosures were placed in open areas lacking vegetation cover, and limnetic and hybrid males were introduced and allowed to build nests. Once nests were constructed, limnetic females were introduced to the enclosures. After two days, all fish were removed, and the nests of limnetic and hybrid males were dissected. The number of eggs in each nest was determined and the number of females spawning in each nest calculated.
 
      18 of 22 limnetic female sticklebacks spawned in the nests of limnetic males.
 
      4 of 22 limnetic female sticklebacks spawned in the nests of hybrid males.



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