Genetic Differentiation of Two Host—Foodplant Complex Sources of Cotesia congregata (Hymenoptera: Braconidae)
The evolution of tritrophic interactions requires adaptations of natural enemies to both herbivorous hosts and host foodplants that can ultimately lead to the formation of locally adapted populations, host races, or ecological species. To situate our model organism, Cotesia congregata (Say), within...
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Published in | Annals of the Entomological Society of America Vol. 108; no. 6; pp. 1014 - 1025 |
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Main Authors | , , |
Format | Journal Article |
Language | English |
Published |
Entomological Society of America
01.11.2015
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Abstract | The evolution of tritrophic interactions requires adaptations of natural enemies to both herbivorous hosts and host foodplants that can ultimately lead to the formation of locally adapted populations, host races, or ecological species. To situate our model organism, Cotesia congregata (Say), within this spectrum, we estimated genetic differentiation of wasps originating from two common host—foodplant complexes, Manduca sexta L. on tobacco (“MsT”) and Ceratomia catalpae (Haworth) on catalpa (“CcC”). To test the hypothesis that C. congregata associated with these host—foodplant, complexes were genetically differentiated even where they occur in sympatry, we experimentally introduced tobacco at an established “catalpa site” for two consecutive years and compared wasps collected at this site with wasps collected from allopatric tobacco and catalpa sites in the mid-Atlantic region of North America. Using seven microsatellite loci and the mitochondrial COI locus, we found differences in microsatellite allele frequencies based on host—foodplant complex (ΦPT values 0.47–0.50 among populations from different host—foodplant complexes), but not based on geographic location (mean ΦPT=0.03). COI haplotypes of MsTand CcC wasps exhibited ∼2% sequence divergence, even where the host—food complexes were colocated within meters at the experimental site. Results indicate that MsT and CcC wasps represent distinct genetic lineages that are most likely incipient or nascent species with limited gene flow. |
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AbstractList | The evolution of tritrophic interactions requires adaptations of natural enemies to both herbivorous hosts and host foodplants that can ultimately lead to the formation of locally adapted populations, host races, or ecological species. To situate our model organism, Cotesia congregata (Say), within this spectrum, we estimated genetic differentiation of wasps originating from two common host—foodplant complexes, Manduca sexta L. on tobacco (“MsT”) and Ceratomia catalpae (Haworth) on catalpa (“CcC”). To test the hypothesis that C. congregata associated with these host—foodplant, complexes were genetically differentiated even where they occur in sympatry, we experimentally introduced tobacco at an established “catalpa site” for two consecutive years and compared wasps collected at this site with wasps collected from allopatric tobacco and catalpa sites in the mid-Atlantic region of North America. Using seven microsatellite loci and the mitochondrial COI locus, we found differences in microsatellite allele frequencies based on host—foodplant complex (ΦPT values 0.47–0.50 among populations from different host—foodplant complexes), but not based on geographic location (mean ΦPT=0.03). COI haplotypes of MsTand CcC wasps exhibited ∼2% sequence divergence, even where the host—food complexes were colocated within meters at the experimental site. Results indicate that MsT and CcC wasps represent distinct genetic lineages that are most likely incipient or nascent species with limited gene flow. |
Author | Eldeib, Georgia M Kester, Karen M Brown, Bonnie L |
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CitedBy_id | crossref_primary_10_1111_een_12852 crossref_primary_10_1371_journal_pone_0210249 crossref_primary_10_1016_j_cois_2016_02_006 crossref_primary_10_1098_rspb_2016_0668 crossref_primary_10_1093_aesa_sav089 crossref_primary_10_1134_S0013873818070059 crossref_primary_10_1111_1440_1703_12344 crossref_primary_10_1093_isd_ixaa017 crossref_primary_10_1371_journal_pone_0198803 crossref_primary_10_3389_fevo_2019_00187 |
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SubjectTerms | Ceratomia catalpae Cotesia congregata evolution gene flow gene frequency genetic variation haplotypes herbivores hosts loci Manduca sexta microsatellite repeats natural enemies population races sympatry tobacco tritrophic interactions |
Title | Genetic Differentiation of Two Host—Foodplant Complex Sources of Cotesia congregata (Hymenoptera: Braconidae) |
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