Identification of trophic niches of subterranean diving beetles in a calcrete aquifer by DNA and stable isotope analyses
Tessa M. Bradford A B , William F. Humphreys B D E , Andrew D. Austin B and Steven J. B. Cooper B C FA CSIRO Land and Water, Urrbrae, SA 5064, Australia.
B Australian Centre for Evolutionary Biology and Biodiversity, and School of Earth and Environmental Sciences, The University of Adelaide, Adelaide, SA 5005, Australia.
C Evolutionary Biology Unit, South Australian Museum, North Terrace, Adelaide, SA 5000, Australia.
D Collections and Research Centre, Western Australian Museum, Welshpool, WA 6106, Australia.
E School of Animal Biology, University of Western Australia, Nedlands, WA 6907, Australia.
F Corresponding author. Email: Steve.Cooper@samuseum.sa.gov.au
Marine and Freshwater Research 65(2) 95-104 https://doi.org/10.1071/MF12356
Submitted: 18 December 2012 Accepted: 1 July 2013 Published: 8 August 2013
Abstract
The Yilgarn calcrete aquifers in Western Australia are an interesting system for investigating the process of speciation within subterranean habitats, because of the limited opportunities for dispersal between isolated calcretes. The presence of different-sized diving beetles (Dytiscidae) in separate calcretes, including sympatric sister-species pairs, suggests that species may have evolved within calcretes by an adaptive shift as a result of ecological-niche differentiation. We have studied the potential for trophic niche partitioning in a sister triplet of diving beetles, of distinctly different sizes, from a single aquifer. Fragments of the mitochondrial COI gene, specific to known species of amphipods and copepods, were polymerase chain reaction-amplified from each of the three beetle species, indicating that there is an overlap in their prey items. Significant differences were found in the detected diets of the three species, and results showed a propensity for prey preferences of amphipods by the large beetles and one species of copepod for the small beetles. A terrestrial source of carbon to the calcrete was suggested by stable isotope analyses. The combined approach of molecular, stable isotope and behavioural studies have provided insight into the trophic ecology of this difficult-to-access environment, providing a framework for more fine-scale analyses of the diet of different-sized species to examine speciation underground.
Additional keywords: amphipods, Chiltoniidae, copepods, dietary analysis, Harpacticoida, stable isotopes, stygofauna, Yilgarn calcrete aquifers.
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