The population genetics of nonmigratory Allen's Hummingbird (

Autor: Brian M, Myers, Kevin J, Burns, Christopher J, Clark, Alan, Brelsford
Rok vydání: 2020
Předmět:
Zdroj: Ecology and Evolution
ISSN: 2045-7758
Popis: Allen's Hummingbird comprises two subspecies, one migratory (Selasphorus sasin sasin) and one nonmigratory (S. s. sedentarius). The nonmigratory subspecies, previously endemic to the California Channel Islands, apparently colonized the California mainland on the Palos Verdes Peninsula some time before 1970 and now breeds throughout coastal southern California. We sequenced and compared populations of mainland nonmigratory Allen's Hummingbird to Channel Island populations from Santa Catalina, San Clemente, and Santa Cruz Island. We found no evidence of founder effects on the mainland population. Values of nucleotide diversity on the mainland were higher than on the Channel Islands. There were low levels of divergence between the Channel Islands and the mainland, and Santa Cruz Island was the most genetically distinct. Ecological niche models showed that rainfall and temperature variables on the Channel Islands are similar in the Los Angeles basin and predicted continued expansion of nonmigratory Allen's Hummingbird north along the coast and inland. We also reviewed previous genetic studies of vertebrate species found on the Channel Islands and mainland and showed that broad conclusions regarding island–mainland patterns remain elusive. Challenges include the idiosyncratic nature of colonization itself as well as the lack of a comprehensive approach that incorporates similar markers and sampling strategies across taxa, which, within the context of a comparative study of island–mainland relationships, may lead to inconsistent results.
The previously island endemic nonmigratory Allen's Hummingbird colonized the southern California mainland some time before 1970. Here, we compare the founding mainland population in a population genetic context to the southern islands and the northern Santa Cruz Island. We also implement ecological niche modeling to assess whether nonmigratory Allen's Hummingbird, which has rapidly expanded its range across mainland southern California, is projected to continue to expand its range in the near future and possibly encroach upon the range of migratory Allen's Hummingbird.
Databáze: OpenAIRE
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