A reply to Iversen et al.'s comment “Monitoring of animal abundance by environmental DNA — An increasingly obscure perspective”
نویسندگان
چکیده
We appreciate the conversation put forward by Iversen et al. (2015) in their response to our article “Quantification of eDNA shedding rates from invasive bighead carp Hypophthalmichthys nobilis and silver carp Hypophthalmichthys molitrix” in the 2015 environmental DNA special issue of Biological Conservation. We agree with Iversen et al.'s concern about overly optimistic conclusions that could be drawn from the current eDNA literature. One hope for eDNA technology is that it can be used in estimating abundance or population density. Evidence suggests that eDNAmeasurements correlate with total biomass (Takahara et al., 2012) rather than abundance. We demonstrate a similar relationship between biomass and eDNA shedding rates. Nevertheless, without field testing of these methods and specific survey protocols, we cannot make strong conclusions regarding the technique's field applicability. In our manuscript, we attempted to point out areas in which more research is needed. Specific to our study, Iversen et al. contend that 1: we cannot make robust estimates of shedding rates, given the variability in our data; and 2: our estimates are weakly correlated with biomass. We do not agree with these conclusions.
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