@article{antonio_bianchini jr._2003,  title={Methodological tests of a heterotrophy index for aquatic ecosystems},  volume={63},  ISSN={1519-6984},  url={https://doi.org/10.1590/S1519-69842003000300003},  DOI={10.1590/S1519-69842003000300003},  number={3},  journal={Brazilian Journal of Biology},  publisher={Instituto Internacional de Ecologia},  author={Antonio, R. M. and Bianchini Jr., I.},  year={2003},  month={Aug},  pages={373–380} }