Optimising biodiversity assessments by volunteers: The application of occupancy modelling to large-scale amphibian surveys

By D. Sewell, T. Beebee, R. Griffiths. 2010

85 citations recorded by the source corpus.

Mobilising volunteers to carry out biodiversity assessments can help to identify priorities for conservation across broad geographical scales. However, even when volunteers carry out simple presence?absence surveys, there can be significant issues over false absences and subsequent data interpretation. Simple but scientifically robust protocols are therefore required for these programmes. Here we evaluate amphibian survey protocols for the National Amphibian and Reptile Recording Scheme (NARRS) in Britain, which aims to assess the status of five widespread amphibian species. Surveys were undertaken by trained volunteers and researchers in two contrasting landscapes over 2 years, and occupancy modelling was used to determine covariates of detection, and to optimise the number of surveys and number of methods required. Although surveys need to take into account seasonal and annual changes in the detectability of different species, there were also landscape effects. Frogs and toads were generally harder to detect in ponds in Kent than in Wales, while the converse was true of newts. Adding bottle-trapping to the suite of methods increased the detection of smooth and palmate newts in both areas, and of great crested newts in Wales. Overall, reliable assessment of the presence or absence of all five species at a site required four separate surveys, each using four different methods (visual encounter surveys during both day and night, dip netting and bottle-trapping). Our approach may prove useful for finding the best compromises between rigor and simplicity when volunteers are used in large-scale surveys.

Subfields: Ecological Modeling, Ecology, Global and Planetary Change

View Paper: https://www.semanticscholar.org/paper/0528ba0246a51ec2372a9247399643d7166ee02c

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Citations in the corpus

Early assessment of the impact of alien species: differential consequences of an invasive crayfish on adult and larval amphibians (2011, methodology): “We used Presence 2.4 (Hines, 2006) to estimate occupancy and evaluate the probability of occupancy of sites where we did not detect species (MacKenzie et al., 2006; Sewell et al., 2010).”
Using eDNA to develop a national citizen science-based monitoring programme for the great crested newt (Triturus cristatus) (2015, methodology): “Detailed inspection of the volunteer site data suggests that, with methodological errors corrected, around 95% of sites would have been correctly identified as supporting newts, close to the level of detection proposed by Sewell et al. (2010) for volunteer surveys.”