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A terrestrial source of carbon to the calcrete was suggested by stable isotope analyses.
![iaea-tecdoc-626 iaea-tecdoc-626](https://www.scientific.net/AMR.317-319.1474/preview.gif)
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. 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. Heterozygous individuals showed intermediate reactions ranging from 1 to 3 (1, 3, 5). teres isolates is often 1 on a scale where 0 very resistant and 4 susceptible however, some isolates produced susceptible reactions (1). We have studied the potential for trophic niche partitioning in a sister triplet of diving beetles, of distinctly different sizes, from a single aquifer. Description: The reaction of cultivars with the Rpt1 gene to Pyrenophora teres f. 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.
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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.