Population genetic structure of the Australian caddisfly Lectrides varians Mosely (Trichoptera: Leptoceridae) and the identification of cryptic species in south-eastern Australia

S.J. Wickson; E.T. Chester; I. Valenzuela; B. Halliday; R.E. Lester; T.G. Matthews; A.D. Miller

doi:10.1007/s10841-014-9711-z

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Population genetic structure of the Australian caddisfly Lectrides varians Mosely (Trichoptera: Leptoceridae) and the identification of cryptic species in south-eastern Australia

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Population genetic structure of the Australian caddisfly Lectrides varians Mosely (Trichoptera: Leptoceridae) and the identification of cryptic species in south-eastern Australia

S.J. Wickson, E.T. Chester, I. Valenzuela, B. Halliday, R.E. Lester, T.G. Matthews and A.D. Miller

Journal of Insect Conservation, Vol.18(6), pp.1037-1046

2014

DOI: https://doi.org/10.1007/s10841-014-9711-z

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Abstract

Lectrides varians (Mosely) is a large, ecologically-important, caddisfly found in perennial and intermittent streams throughout much of eastern Australia. We conducted a population genetic analysis to investigate the dispersal potential of L. varians, building on previous works that have assessed life-history traits associated with drought resistance. Genetic analyses of L. varians from the Grampians region of Victoria, based on mitochondrial DNA sequence data, revealed extensive gene flow and a lack of genetic structure across the sample range (ΦST = 0.04). This suggests that the species is a strong disperser and is likely to be resilient to increased drying and habitat fragmentation under climate change considering other known resistance traits. However, during this study, two divergent genotypes were identified, indicating a potential species complex. A comprehensive phylogenetic analysis of L. varians across its current range was subsequently performed, confirming the species is indeed paraphyletic, consisting of one lineage that is restricted to the Grampians National Park and the other being widespread throughout south-eastern Australia. Further analyses revealed consistent morphological differences between these lineages supporting the notion that L. varians is a species complex. We discuss the implications of these findings with regard to conservation and taxonomy of this important invertebrate group.

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Title: Population genetic structure of the Australian caddisfly Lectrides varians Mosely (Trichoptera: Leptoceridae) and the identification of cryptic species in south-eastern Australia
Authors/Creators: S.J. Wickson (Author/Creator) - Deakin University
E.T. Chester (Author/Creator) - Murdoch University
I. Valenzuela (Author/Creator) - The University of Melbourne
B. Halliday (Author/Creator) - Deakin University
R.E. Lester (Author/Creator) - Deakin University
T.G. Matthews (Author/Creator) - Deakin University
A.D. Miller (Author/Creator) - The University of Melbourne
Publication Details: Journal of Insect Conservation, Vol.18(6), pp.1037-1046
Publisher: Springer
Identifiers: 991005540323707891
Murdoch Affiliation: School of Veterinary and Life Sciences
Language: English
Resource Type: Journal article

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Collaboration types: Domestic collaboration
Citation topics: 3 Agriculture, Environment & Ecology; 3.2 Marine Biology; 3.2.62 Freshwater Fish Ecology
Web Of Science research areas: Biodiversity Conservation; Entomology
ESI research areas: Plant & Animal Science