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\begin{document}

\title{Predicting downstream transport distance of fish eDNA in lotic
environments}



\author[1]{Didier Pont}%
\affil[1]{University of Natural Resources and Life Sciences Vienna}%


\vspace{-1em}



  
  \date{May 24, 2024}


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\begin{abstract}
Environmental DNA is an effective tool for describing fish biodiversity
in lotic environments, but the downstream transport of eDNA released by
organisms makes it difficult to interpret species detection at the local
scale. In addition to biophysical degradation and exchanges at the
water-sediment interface, hydrological conditions control the transport
distance. We have developed an eDNA transport model that considers
downstream retention and degradation processes in combination with
hydraulic conditions and assumes that the sedimentation rate of very
fine particles is a correct estimate of the eDNA deposition rate. Based
on meta-analyses of available studies, we successively modelled the
particle size distribution of fish eDNA (PSD), the relationship between
the sedimentation rate and the size of very fine particles in
suspension, and the influence of temperature on the degradation rate of
fish eDNA. After combining the results in a mechanistic-based model, we
correctly simulated the eDNA uptake distances observed in a compilation
of previous experimental studies. eDNA degradation is negligible at low
flow and temperature but has a comparable influence to background
transfer when hydraulic conditions allow a long uptake distance. The
wide prediction intervals associated with the simulations reflect the
complexity of the processes acting on eDNA after shedding. This model
can be useful for estimating eDNA detection distance downstream from a
source point and discussing the possibility of false positive detection
in eDNA samples, as shown in an example.%
\end{abstract}%



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\textbf{Hosted file}

\verb`PONT D. MANUSCRIPT to Molecular Ecology Resources.docx`  available at \url{https://authorea.com/users/456936/articles/657983-predicting-downstream-transport-distance-of-fish-edna-in-lotic-environments}

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