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SITE NAME
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Pyasina River basin, Taimyr, Russia
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| Contact details
(phone/fax//e-mail//address): |
| (3919)468504(h)/(3919)468693(o) // ya.kokorev@norcom.ru // Naberezhnaya Urvantseva 23-271, Norilsk, 663300, Russia
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PROJECT DETAILS |
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Project name:
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Dynamics of numbers of the Peregrine Falcon
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Start of survey:
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End
of survey: |
Team
size: |
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4.07
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16.08
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WEATHER
CONDITIONS
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| Season phenology: |
average
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Weather conditions: |
| Break-up on rivers and development of vegetation were generally in line with the pattern of average year, at least in the tundra zone. From 4 July to 16 August weather was cool. Heavy rains occurred from 10-30 July, which could have affected reproductive performance of waders and passerines.
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| Date of ice-break on
rivers: |
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| Date of final loss of
snow: |
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BIOTIC
CONDITIONS
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| Rodents abundance evaluation: |
average
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Breeding conditions:
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Many chicks were found in nests of Herring Gulls already on 4 July on Chayachi Island at the south of the area (app. 70øN, 88øE). Fishermen reported laying of the first egg by a pair of Whire-fronted Geese on 9 June and hatching of 5 chicks of 6 eggs at the upper reaches of Pyasina. White-fronted Geese were rare on tributaries of the middle reaches of the Pyasina River, while Bean and Red-breasted geese were common. 22 Bewick's Swans were seen on 13 July per 120 km of the Yangoda River.
Numbers of Siberian and Collared lemmings were, probably, average, given that Arctic Foxes occupied 20% of available dens on the Yangoda River in the center of the area. Nesting Snowy Owls were not observed, but nesting Rouph-legged Buzzards and Herring Gulls were common, and their clutches were large.
Density of nesting Peregrine Falcons increased in the southern and central parts of the Pyasina River basin, but not on the northernmost of the surveyed tributaries (Toreya River).
Chicks hatched successfully in 4 of 5 controlled nests of Temminck Stints, while in one 3 chicks died during heavy rain in the third week of July. Among 16 surveyed nests of Peregrine Falcons most contained complete clutches, which indicates average or high numbers and successful reproduction of waders.
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Rodent dynamics:
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Rodent species recorded:
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Summary
of fauna studies: |
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