Led by Dr Philine Feulner, a team from Eawag - the Swiss Federal Institute of Aquatic Science and Technology, the University of Bern, and the Natural History Museum of Basel, examined 99 genomes of 22 whitefish species and confirmed earlier hypothesis that this diversity has arisen independently in each group of lakes since the last ice age, partly as a result of adaptation to different depths and food sources. Particularly, the edar gene played a key role, which influences the gill-raker count and thus the "sieve density" when it comes to catching insects or plankton. But there were also thousands of other genes that had an impact, most of which were only important in a single lake. It is noteworthy that very different whitefish species from the same lake are still genetically more similar than species which, at first glance, may appear to be similar, but which have developed in parallel elsewhere.
Many species found only here
Genetic exchange within, but also between the larger lakes has led to hybridisation. This has favoured the emergence of unusual species and thus the large variety of endemic whitefish species seen in the perialpine lakes, i.e. species that are unique to this region.