Note. All the studies collecting eDNA by filtration or centrifugation measured eDNA quantity by real-time or digital PCR. All the metabarcoding studies collected aqueous eDNA by filtration. Amplicon size was not reported in Salter et al. (2019) because they used a commercial kit.
Table 2. Summary of a GLMM with MCMC algorithm assessing the effects of multiple factors on R2 values (Fisher’s z-transformed).