Ancestral sperm ecotypes reveal multiple invasions of a non-native fish in northern Europe

Leon Green, Apostolos Apostolou, Ellika Faust, Kajsa Palmqvist, Jane W. Behrens, Jonathan N. Havenhand, Erica H. Leder & Charlotta Kvarnemo
For externally fertilising organisms in the aquatic environment, the abiotic fertilisation medium can be a strong selecting force. Among bony fishes, sperm are adapted to function in a narrow salinity range. A notable exception is the family Gobiidae, where several species reproduce across a wide salinity range. The family also contains several wide-spread invasive species. To better understand how these fishes tolerate such varying conditions, we measured sperm performance in relation to salinity from a...
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