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22 January 2019 Vertical Habitat Stratification in Sympatric and Allopatric Populations of Aedes hendersoni and Aedes triseriatus (Diptera: Culicidae)
Jamie Fitzgerald, Todd P. Livdahl
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Vertical habitat stratification in populations of Aedes hendersoni Cockerell (Diptera: Culicidae) and Aedes triseriatus (Say) (Diptera: Culicidae) has been observed to varying degrees throughout the lspecies' sympatric range, and potential causes of the phenomenon, including species competition and interaction, have been debated extensively. Stratification patterns in oviposition in allopatric, sympatric, and marginally sympatric populations of both species were investigated and compared in this research to detect any pattern differences related to species composition. Expected patterns were observed in sympatric populations, with Ae. hendersoni preferentially ovipositing in canopy habitats, whereas Ae. triseriatus preferred basal habitats. Allopatric populations presented a strong shift toward basal preference in the former and a slighter but significant shift toward canopy in the latter. Marginal populations of Ae. hendersoni showed intermediate height preferences, whereas preferences of marginal and sympatric Ae. triseriatus did not differ. The convergence of habitat selection in allopatric populations and corresponding divergence in sympatric populations support interspecific competition-based hypotheses regarding the origin of the stratification phenomenon, although plausible alternative or contributing explanations are numerous and warrant further study.

© The Author(s) 2019. Published by Oxford University Press on behalf of Entomological Society of America. All rights reserved. For permissions, please e-mail:
Jamie Fitzgerald and Todd P. Livdahl "Vertical Habitat Stratification in Sympatric and Allopatric Populations of Aedes hendersoni and Aedes triseriatus (Diptera: Culicidae)," Journal of Medical Entomology 56(2), 311-319, (22 January 2019).
Received: 3 May 2018; Accepted: 21 June 2018; Published: 22 January 2019

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Aedes hendersoni
Aedes triseriatus
niche diversification
resource partitioning
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