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Articles by Peter Solymos
Species Distribution Models and Abundance Estimates Enhance Breeding Bird Atlas Data
1 Introduction Understanding the distribution and abundance of species is a fundamental goal of ecologists and essential for effective conservation management. Numerous studies and reviews have highlighted the alarming changes to species distributions as well as extinctions of populations across the planet (Wilson 2002; Cardinale et al. 2012). For instance, Mace et al.
Point count data analysis: How to violate assumptions and get away with it
This book provides material for the workshop Analysis of point-count data in the presence of variable survey methodologies and detection error at the AOS 2019 conference by Peter Solymos. The book and related materials in this repository is the basis of a full day workshop (8 hours long with 3 breaks). Prior exposure to R language is necessary (i.e. basic R object types and their manipulation, such as arrays, data frames, indexing) because this is not covered as part of the course.
Fitting removal models with the detect R package
In a paper recently published in the Condor, titled Evaluating time-removal models for estimating availability of boreal birds during point-count surveys: sample size requirements and model complexity, we assessed different ways of controlling for point-count duration in bird counts using data from the Boreal Avian Modelling Project. As the title indicates, the paper describes a cost-benefit analysis to make recommendations about when to use different types of the removal model.
Shiny slider examples with the intrval R package
The intrval R package is lightweight (~11K), standalone (apart from importing from graphics, has exactly 0 non-base dependency), and it has a very narrow scope: it implements relational operators for intervals — very well aligned with the tiny manifesto. In this post we will explore the use of the package in two shiny apps with sliders. The first example uses a regular slider that returns a single value.
Phylogeny and species traits predict bird detectability
It all started with this paper in Methods in Ecol. Evol. where we looked at detectability of many species. So we wanted to use life history traits to validate our results. But we had to cut the manuscript, and there was this leftover with some neat patterns, but without much focus. It took a few years, and the most positive peer-review experience ever, and the paper is now early view in Ecography.
PVA: Publication Viability Analysis, round 3
A friend and colleague of mine, Péter Batáry has circulated news from Nature magazine about the EU freezing innovation funds to Bulgaria. The article had a figure about publication trends for Bulgaria, compared with Romania and Hungary. As I have blogged about such trends in ecology before (here and here), I felt the need to update my PVA models with two years worth of data from WoS. After downloading the yearly publications numbers using filters , I started where I left off few years ago.
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