The current loss of biodiversity has been broadly acknowledged as the main cause of
ecosystem change. To halt this trend, several international agreements have been made …

Citizen science is on the rise. Aided by the internet, the popularity and scope of citizen
science appears almost limitless. For citizens the motivation is to contribute to “real” science …

Krill habitats in the Southern Ocean are impacted by changing climate conditions, reduced
sea ice and rising temperatures. These changes, in turn, affect krill occurrence, physiology …

This advanced text focuses on the uses of distance sampling to estimate the density and
abundance of biological populations. It addresses new methodologies, new technologies …

This document introduces the viable salmonid population (VSP) concept, identifies VSP
attributes, and provides guidance for determining the conservation status of populations and …

Long-term time series are necessary to better understand population dynamics, assess
species' conservation status, and make management decisions. However, population data …

Abstract The North American Breeding Bird Survey is a roadside, count-based survey
conducted by volunteer observers. Begun in 1966, it now is a primary source of information …

Freshwater ecosystems constitute only a small fraction of the planet's water resources, yet
support much of its diversity, with freshwater fish accounting for more species than birds …

A fundamental problem in estimating biodiversity loss is that very little quantitative data are
available for insects, which comprise more than two-thirds of terrestrial species. We present …

Knowledge of the direction, magnitude, and timing of changes in bird population abundance
is essential to enable species of priority conservation concern to be identified, and reasons …