Abundance, Density and Relative Abundance: A Conceptual Framework

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Evaluating relative abundance indices for terrestrial herbivores from large-scale camera trap surveys (2018, background): “…implicitly assume that encounter probability is constant over the spatial or temporal dimension of inference, changes in the index values may reflect variation in encounter probabilities rather than true changes in underlying abundance (Foster & Harmsen, 2012; O’Brien, 2011; Sollmann et al., 2013).”
Comparison of density estimation methods for mammal populations with camera traps in the Kaa‐Iya del Gran Chaco landscape (2012, methodology): “Determining the ETA depends entirely on the buffer distance(s) used, and selecting the ‘best’ method to estimate the buffer area is difficult (O’Brien, 2011; for reviews of available methods, see Williams et al., 2002; Foster & Harmsen, 2012).”