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RESPONDENT
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Vasily Sokolov
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SITE NAME
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Erkatayakha and Payutayakha rivers, Yamal, Russia
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| Contact details
(phone/fax//e-mail//address): |
| (343) 210-3858, add. 104/89028432787 // vsokolov@inbox.ru // Lab. of biocenological processes, Inst. of plant and animal ecology, 8 Marta Str, 202, Ekaterinburg, 620144 Russia
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PROJECT DETAILS |
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Project name:
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Dynamics of bird populations on the south-western Yamal
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Start of survey:
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End
of survey: |
Team
size: |
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4.06
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22.06
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3
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WEATHER
CONDITIONS
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Weather conditions: |
| Cold weather with frequent frosts prevailed in early June, with air temperatures not exceeding +3-5øC and northern or western winds before 10 June. Rivers broke in late May, but did not cleared from ice until 15-18 June, which had not been recorded previously. Snow mel developed slowly as well, and most slopes and bushy areas were still under snow in early June. This resulted in prolonged prenesting and laying periods in passerines and some waders. Most lakes were under ice in the beginning of studies, and leads were present only on waterbodies connected to river. Activity of birds was very low before 10 June, but then air temperature increased quickly due to southeasterly winds, which combined with heavy rains resulted in rapid melt of snow. Wide tindra areas became free from snow quickly, and mosquitoes appeared already by 14 June. Water table in the river remained high for a long period of time, and was decreasing slowly.
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| Date of 50%
snow-cover: |
10-14.06
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| Date of ice-break on
rivers: |
30.05-17.06
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| Date of final loss of
snow: |
20-22.06
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BIOTIC
CONDITIONS
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| Rodents abundance evaluation: |
average
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Breeding conditions:
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| Extremal weather events were not recorded. While early June was late and cold, afterwards breeding conditions became favourable in general. Predators were not abundant, while numbers of rodents were average. Densities of Willow Grouse and Common Snipe were the highest on record during the last 5 years.
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Rodent dynamics:
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| Rodents were not abundant. Juveniles were recorded.
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Rodent species recorded:
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| Latin | Abundance |
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| Dicrostonyx torquatus | rare |
| Microtus middendorffi | common |
| Microtus gregalis | rare |
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Summary
of fauna studies: |
| Absolute bird counts were conducted on plots in a framework of long-term monitoring of bird densities.
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