Molecular biogeography and host relations of a parasitoid fly.

Autor: Gray DA; Department of Biology California State University Northridge Northridge CA USA., Kunerth HD; Department of Ecology and Evolutionary Biology Cornell University Ithaca NY USA.; Department of Ecology, Evolution, and Behavior University of Minnesota St. Paul MN USA., Zuk M; Department of Ecology, Evolution, and Behavior University of Minnesota St. Paul MN USA., Cade WH; Department of Biological Sciences University of Lethbridge Lethbridge AB Canada., Balenger SL; Department of Biology University of Mississippi University MS USA.
Jazyk: angličtina
Zdroj: Ecology and evolution [Ecol Evol] 2019 Sep 26; Vol. 9 (19), pp. 11476-11493. Date of Electronic Publication: 2019 Sep 26 (Print Publication: 2019).
DOI: 10.1002/ece3.5649
Abstrakt: Successful geographic range expansion by parasites and parasitoids may also require host range expansion. Thus, the evolutionary advantages of host specialization may trade off against the ability to exploit new host species encountered in new geographic regions. Here, we use molecular techniques and confirmed host records to examine biogeography, population divergence, and host flexibility of the parasitoid fly, Ormia ochracea (Bigot). Gravid females of this fly find their cricket hosts acoustically by eavesdropping on male cricket calling songs; these songs vary greatly among the known host species of crickets. Using both nuclear and mitochondrial genetic markers, we (a) describe the geographical distribution and subdivision of genetic variation in O. ochracea from across the continental United States, the Mexican states of Sonora and Oaxaca, and populations introduced to Hawaii; (b) demonstrate that the distribution of genetic variation among fly populations is consistent with a single widespread species with regional host specialization, rather than locally differentiated cryptic species; (c) identify the more-probable source populations for the flies introduced to the Hawaiian islands; (d) examine genetic variation and substructure within Hawaii; (e) show that among-population geographic, genetic, and host song distances are all correlated; and (f) discuss specialization and lability in host-finding behavior in light of the diversity of cricket songs serving as host cues in different geographically separate populations.
Competing Interests: None declared.
(© 2019 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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