Species-specific population estimates are fundamental for many aspects of ecology,
evolution, and conservation, yet they are lacking for most species. Aiming to fill this gap …

We thank Robinson et al.(1) for their interest in our paper quantifying the global species
abundance distribution (gSAD) of birds (2). We agree with some of their points regarding …

Quantifying the abundance of species is essential to ecology, evolution, and conservation.
The distribution of species abundances is fundamental to numerous longstanding questions …

An important metric for many aspects of species conservation planning and risk assessment
is an estimate of total population size. For landbirds breeding in North America, Partners in …

Aim Ecological data collected by the general public are valuable for addressing a wide
range of ecological research and conservation planning, and there has been a rapid …

Understanding and accurately modeling species distributions lies at the heart of many
problems in ecology, evolution, and conservation. Multiple sources of data are increasingly …

Abundance estimation is central to avian ecology. For replicated counts, developed a model
to estimate abundance adjusted for detectability. Hitherto, it was unknown whether the same …

Population size is a key metric for management and policy decisions, yet wildlife monitoring
programmes are often limited by the spatial and temporal scope of surveys. In these cases …

Ecologists and conservation biologists seem increasingly attracted to sophisticated
modelling approaches, sometimes at the expense of attention to data quality and …

July 2006] 893 collected by surveys; most large-scale surveys collect indices of population
size rather than unbiased estimates of population size. An index is a statistic (eg, point count …