From the red grouse to the Ethiopian bush-crow, bird populations around the world can
provide us with vital insights into the effects of climate change on species and ecosystems …

One enduring priority for ecologists has been to understand the cause (s) of variation in
reproductive effort among species and localities. Avian clutch size generally increases with …

Summary 1 Elevational gradients create environmental variation that is hypothesized to
promote variation in life‐history strategies. We tested whether differences in life‐history …

Animals breeding at northern latitudes experience drastic changes in daily light conditions
during the breeding season with decreasing periods of darkness, whereas those living at …

Arthropod assemblages living in tree canopies in two habitat types—a rich woodland and
poor parkland—were studied in 2003–2005 as a background for describing the dynamics of …

Sporting a mix of blue, yellow, white, green and black, the unmistakable Blue Tit reflects the
colours of a planet affected by a burgeoning human population. Fortunately, Blue Tits are …

Numerous studies from different locations in Europe show that nest-box populations of tits in
urban areas lay earlier and produce fewer eggs than do tits in rural areas. We collected data …

Although avian malarial parasites are globally distributed, the factors that affect the
geographical distribution and local prevalence of different parasite lineages across host …

Abstract Hopkins' Bioclimatic Law predicts geographical patterns in phenological timing by
establishing a correspondence between latitudinal and altitudinal gradients. First proposed …

Aim As global temperatures have increased, many species distributions have exhibited
polewards shifts, a trend that is predicted to continue in future decades. However, the …