Long-term arrival trends of 54 avian species to Barguzinsky Nature Reserve in the northeastern Baikal area

Ananin, A.A. & Sokolov L.V. (2009): Long-term arrival trends of 54 avian species to Barguzinsky Nature Reserve in the northeastern Baikal area. Avian Ecol. Behav. 15: 33-48. We analysed phenological observations on spring arrival of 54 avian species to Barguzinsky Nature Reserve in 1938-2001. Twenty-eight species (52%) showed a trend towards earlier ar- rival, 14 species (26%) showed a trend towards later arrival. In 12 species (22%) the timing of spring arrival did not change. Most avian species that started to arrive earlier were passerines (65% of species). Later arrival was mainly recorded in waterfowl and birds of prey. Earlier ar- rival recorded in roughly one-half of the species analysed, is probably due to climate warming recorded in the study region in the late 20th century. These species may be treated as pheno- logical indicators illustrating climate change in the northeastern Baikal area.