Nearly 300 species of landbirds, whose populations total billions, migrate between the
Neotropics and North America. Many migratory populations are in steep decline, and …

There is now overwhelming evidence that an increase in the concentration of greenhouse
gases in the Earth's atmosphere has caused global temperatures to increase by 0.6° C since …

Old-growth forests have traditionally been considered negligible as carbon sinks because
carbon uptake has been thought to be balanced by respiration. We show that the top 20 …

In light of the wide‐scale replacement of native plants in North America with introduced,
invasive species and noninvasive ornamental plants that evolved elsewhere, we compared …

Understanding how animals will adapt to climate change requires understanding how
climate variables influence their biology year round, and how events in different seasons …

Addressing population declines of migratory insects requires linking populations across
different portions of the annual cycle and understanding the effects of variation in weather …

Aim Habitat loss and climate change constitute two of the greatest threats to biodiversity
worldwide, and theory predicts that these factors may act synergistically to affect population …

Since its introduction to North America in 1999, West Nile virus (WNV) has had devastating
impacts on native host populations, but to date these impacts have been difficult to measure …

Analysis of synchrony in population fluctuations can help to identify factors that regulate
populations and the scales at which these factors exert their influence. Using 15 years of …

Bird populations have declined in many parts of the world but most of those declines can be
attributed to effects of human activities (eg, habitat fragmentation); declines in areas …