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A selective advantage to immigrant genes in a Daphnia metapopulation

Ebert, Dieter ; Haag, Christoph ; Kirkpatrick, Mark ; Riek, Myriam ; Hottinger, Jürgen W. ; Pajunen, V. Ilmari

In: Science 295(5554): 485 - 488, 2002, 2002, vol. 295, no. 5554, p. 485-488

Immigrants to habitats occupied by conspecific organisms are usually expected to be competitively inferior, because residents may be locally adapted. If residents are inbred, however, mating between immigrants and residents results in offspring that may enjoy a fitness advantage from hybrid vigor. We demonstrate this effect experimentally in a natural Daphnia metapopulation in which...