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Morphological discontinuous variation and disparity in Lutzomyia (Tricholateralis) cruciata Coquillett, 1907 are not related to contrasting environmental factors in two biogeographical provinces

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Abstract

Lutzomyia cruciata (Diptera: Phlebotominae) is an important Leishmania vector with wide distribution in America. However, geographical patterns of morphological variation of populations along its longitudinal and latitudinal distribution are still unknown. In this work, we quantified morphological variation and disparity in 243 specimens (females) from nine sample groups of Lu. cruciata from two biogeographical provinces in Mexico: Veracruzan Province (five groups) and Yucatan Peninsula Province (four groups). We registered two linear morphometric data of a reproductive structure (spermatheca) and one landmark configuration for wing shape. Our questions were if intraspecific morphological variation and disparity are related to contrasting environmental factors in these two provinces. First, our results from canonical variates analyses of the spermatheca and wing shape revealed more differences among groups of specimens within a biogeographic province than between. Second, our regression analyses revealed that morphometric variation is weakly related to 20 environmental variables considered for the two biogeographic provinces. Levels of morphological disparity in the spermatheca and wing shape within the two provinces are the same regardless of environmental homogeneity in the Yucatan Province or heterogeneity in the Veracruzan Province. These patterns of morphological variation and disparity weakly correlated with environmental variables suggest that intraspecific variation in Lu. cruciata is not clinal within a province. Subsequent investigations will be required to elucidate suspected correlations of local discontinuous phenotypes with genetic divergence within a biogeographical province.

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Acknowledgements

The first author (ACMOA) was supported by a graduate scholarship from the Mexican Council of Science and Technology (CONACYT, No. 414043). The present work was supported by project INECOL-10816 granted to SIB. We express our thanks to Maria Teresa Suarez Landa who helped in laboratory procedures. The helpful field assistance of Carlos Roberto García Torres, Mario Vázquez Márquez, Jorge Alberto Solis Hernández, Manuel Ramirez Castillo, Ignacio Alcazar Gómez, and David Moo-Llanes is also very much appreciated. We also thank three anonymous reviewers for significantly improving our manuscript.

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Contributions

All five authors designed the study, ACMOA and EART collected the samples, ACMOA performed morphometric measurements of sampled material and data analyses, ACMOA and EL performed statistical analysis, ACMOA, EL and SIB wrote the manuscript, and all authors contributed in improving the draft of the manuscript by adding valuable comments.

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Correspondence to Sergio Ibáñez-Bernal.

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The authors declare that they have no conflict of interest.

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All applicable international, national, and/or institutional guidelines for the care of participants in the field collection were followed.

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All data generated and analyzed during this study are included in this published article and its supplementary information files.

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Montes de Oca-Aguilar, A.C., De Luna, E., Rebollar-Téllez, E.A. et al. Morphological discontinuous variation and disparity in Lutzomyia (Tricholateralis) cruciata Coquillett, 1907 are not related to contrasting environmental factors in two biogeographical provinces. Zoomorphology 138, 335–348 (2019). https://doi.org/10.1007/s00435-019-00450-8

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  • DOI: https://doi.org/10.1007/s00435-019-00450-8

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