Journal
BIOLOGICAL CONSERVATION
Volume 183, Issue -, Pages 77-84Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biocon.2014.11.020
Keywords
eDNA; qPCR; Asian carp; Invasive species; Species detection
Funding
- Missouri Department of Conservation, The University of Missouri
- U.S. Fish and Wildlife Service
- U.S. Geological Survey
- Wildlife Management Institute
- Great Lakes Restoration Initiative funds (EPA)
- USGS
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Wildlife managers can more easily mitigate the effects of invasive species if action takes place before a population becomes established. Such early detection requires sensitive survey tools that can detect low numbers of individuals. Due to their high sensitivity, environmental DNA (eDNA) surveys hold promise as an early detection method for aquatic invasive species. Quantification of eDNA amounts may also provide data on species abundance and timing of an organism's presence, allowing managers to successfully combat the spread of ecologically damaging species. To better understand the link between eDNA and an organism's presence, it is crucial to know how eDNA is shed into the environment. Our study used quantitative PCR (qPCR) and controlled laboratory experiments to measure the amount of eDNA that two species of invasive bigheaded carps (Hypophthalmichthys nobilis and Hypophthalmichthys molitrix) shed into the water. We first measured how much eDNA a single fish sheds and the variability of these measurements. Then, in a series of manipulative lab experiments, we studied how temperature, biomass (grams of fish), and diet affect the shedding rate of eDNA by these fish. We found that eDNA amounts exhibit a positive relationship with fish biomass, and that feeding could increase the amount of eDNA shed by ten-fold, whereas water temperature did not have an effect. Our results demonstrate that quantification of eDNA may be useful for predicting carp density, as well as densities of other rare or invasive species. (C) 2014 Elsevier Ltd. All rights reserved.
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