Use of removal sampling to estimate abundance of larval salamanders (Salamandra salamandra) in streams

in Amphibia-Reptilia
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In an era of ongoing biodiversity loss, there is a need for reliable methods that can be used to estimate population size and trends. Removal sampling can be used to estimate the abundance of a single population or of multiple spatially distinct populations of animals. Because multiple removal passes are made during a single visit to a population, it may be very efficient in terms of logistics. Here, we use removal sampling and hierarchical models to estimate the abundance of salamander (Salamandra salamandra) larvae in 15 first- and second-order streams. Detection was positively affected by sampling day, suggesting that observers improved their ability to detect salamander larvae. Abundance was positively affected by the number of pools in the streams. Overall, the removal sampling method performed well despite small sample size. Removal sampling may be a useful method for monitoring amphibians.

Use of removal sampling to estimate abundance of larval salamanders (Salamandra salamandra) in streams

in Amphibia-Reptilia


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    Relationships between sampling day and detection probability and abundance and the number of pools based on the best model in table 1. Abundance is estimated for a 75 m long section of stream. Symbols are model-averaged means and standard error. The values for sampling day and the number of pools, respectively, are the observed values. Some streams have the same value of the predictor. Therefore, the number of points in the plot is smaller than the number of streams.

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