Formation and analysis of long-term series of bird population observations at key sites as a method of studying biodiversity
A. A. Ananin1,2
a:2:{s:4:"TYPE";s:4:"HTML";s:4:"TEXT";s:280:"1Federal State Establishment “United Administration of Barguzinsky State Nature Biosphere Reserve and Zabaikalsky National Park” (FSE “Zapovednoe Podlemorye”), Ust-Barguzin, Russia
2Institute of General and Experimental Biology of SB RAS, Ulan-Ude, Russia";}
Keywords: птицы, фенология, учеты численности, долговременный мониторинг, Баргузинский хребет, Байкал, birds, phenology, counts of numbers, long-term monitoring, Barguzin ridge, Baikal
Abstract
Studies of 35-year dynamics of the number of bird species of and 80-year observations of their arrival on the western macro-slope of the Barguzin Ridge have been carried out. A steady decrease in the total abundance of background species of birds after 1997-1998 was revealed. Shifts and cyclic changes in the time of arrival of birds were found. The 26 species (40.0 %) from the 65 species arrived statistically significantly earlier, 7 species (10.8 %) arrived later, and 32 species (49.2 %) had no statistically significant timing. Links have been established between the timing of the first registrations of migratory bird species and their local abundance and habitat distribution. Some mechanisms for forming the local bird’s population have been disclosed, including using redistribution of species breeding density between river valleys and habitats on a high profile.
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