A multispecies dependent double-observer model: A new method for estimating multispecies abundance

Ecology and Evolution
Jessie D GoldingVictoria J Dreitz

Abstract

Conservation of biological communities requires accurate estimates of abundance for multiple species. Recent advances in estimating abundance of multiple species, such as Bayesian multispecies N-mixture models, account for multiple sources of variation, including detection error. However, false-positive errors (misidentification or double counts), which are prevalent in multispecies data sets, remain largely unaddressed. The dependent-double observer (DDO) method is an emerging method that both accounts for detection error and is suggested to reduce the occurrence of false positives because it relies on two observers working collaboratively to identify individuals. To date, the DDO method has not been combined with advantages of multispecies N-mixture models. Here, we derive an extension of a multispecies N-mixture model using the DDO survey method to create a multispecies dependent double-observer abundance model (MDAM). The MDAM uses a hierarchical framework to account for biological and observational processes in a statistically consistent framework while using the accurate observation data from the DDO survey method. We demonstrate that the MDAM accurately estimates abundance of multiple species with simulated and real mult...Continue Reading

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Citations

Oct 21, 2019·Ecological Applications : a Publication of the Ecological Society of America·Kaitlyn M StrickfadenVictoria J Dreitz

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Software Mentioned

R
R Core Team

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