Abstract
The diet of Antarctic krill (Euphausia superba) has been studied using a variety of techniques, but current methods still suffer from problems that are difficult to solve. This study examined an alternative approach utilizing DNA as a prey biomarker. Methods were developed for the preservation, extraction, and identification of prey DNA from krill collected in the field. Group-specific polymerase chain reaction (PCR) was used to amplify diatom prey (Phylum: Bacillariophyta) and the results from DNA clone libraries were compared with microscopic diet analysis. DNA analysis was superior to microscopy for prey detection. However, differences in prey relative abundance estimates between the two techniques suggested some bias in the DNA-based estimates. Quantification showed that large amounts of prey DNA had been successfully preserved and extracted. Overall the results suggest that the application of DNA-based diet analysis to krill warrants further investigation, particularly for prey that are difficult to study using other methods.
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Acknowledgments
We thank the captain and crew of RSV Aurora Australis for their assistance in collecting krill samples; Andrew Pankowski for supply of diatom cultures; and Bruce Deagle, Adam Smolenski, Andrew Pankowski, and Andrew Bissett for their valuable insight and discussion. This work was funded by the Australian Antarctic Division as part of the Antarctic Marine Living Resources (AMLR) Program.
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Passmore, A.J., Jarman, S.N., Swadling, K.M. et al. DNA as a Dietary Biomarker in Antarctic Krill, Euphausia superba . Mar Biotechnol 8, 686–696 (2006). https://doi.org/10.1007/s10126-005-6088-8
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DOI: https://doi.org/10.1007/s10126-005-6088-8