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PARTIAL REPRODUCTIVE ISOLATION OF A RECENTLY DERIVED RESIDENT‐FRESHWATER POPULATION OF THREESPINE STICKLEBACK ( GASTEROSTEUS ACULEATUS ) FROM ITS PUTATIVE ANADROMOUS ANCESTOR
Author(s) -
Furin Christoff G,
von Hippel Frank A,
Bell Michael A
Publication year - 2012
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.2012.01672.x
Subject(s) - gasterosteus , stickleback , biology , reproductive isolation , fish migration , assortative mating , population , allopatric speciation , mating , ecology , evolutionary biology , zoology , fishery , habitat , fish <actinopterygii> , demography , sociology
We used no‐choice mating trials to test for assortative mating between a newly derived resident‐freshwater population (8–22 generations since founding) of threespine stickleback ( Gasterosteus aculeatus ) in Loberg Lake, Alaska and its putative anadromous ancestor as well as a morphologically convergent but distantly related resident‐freshwater population. Partial reproductive isolation has evolved between the Loberg Lake population and its ancestor within a remarkably short time period. However, Loberg stickleback readily mate with morphologically similar, but distantly related resident‐freshwater stickleback. Partial premating isolation is asymmetrical; anadromous females and smaller resident‐freshwater males from Loberg Lake readily mate, but the anadromous males and smaller Loberg females do not. Our results indicate that premating isolation can begin to evolve in allopatry within a few generations after isolation as a correlated effect of evolution of reduced body size.