DNA extraction was conducted using the DNAeasy Qiagen kit, while the DNA was quantified using the GloMax Plate Reader System (Promega) using the QuantiFluor® dsDNA System (Promega) chemistry. Samples were submitted for metagenomic analysis to a third party (CosmoID) which has validated methods and software17 (link),18 (link) for library preparation, sequencing and cloud-based computing for data analysis19 .