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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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3.06
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25.06
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4
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WEATHER
CONDITIONS
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Weather conditions: |
| Ice break-up and snow melt were the earliest on record for the last 4 years of observations. Ice broke on rivers on 20-21 May. Snow cover reduced to 50% approximately on 26-28 May, to 25% at our arrival on 3 June and melted completely from level areas on 20-22 June. Warm, dry, clear and windless weather prevailed in the first half of June. Air temperature reached +15ø-+17øC by 10 June and birds displayed during the whole day at this time. Three snowfalls were recorded in the first half of June and 2 in the second half of month. The weather turned cold in the second half of June. Rains and snowfalls with northerly winds occurred at small intervals from 14 to 17 June. Heavy snowfall in the evening 17 June was followed by decrease of temperature to approximately -2øC. Snow melted by the next morning, but cool, rainy and windy conditions were observed until 23 June. Water level in the river was unstable in this period of time.
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| Date of 50%
snow-cover: |
27.05
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| Date of ice-break on
rivers: |
20.05
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| Date of final loss of
snow: |
21.06
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BIOTIC
CONDITIONS
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| Rodents abundance evaluation: |
average
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Breeding conditions:
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| Early spring phenology resulted in early breeding in most species of birds. The first nests of Red-throated Pipits with complete clutches were found allready on 8 June, while nest of Wood Sandpipers with a clutch of 4 eggs and nest of Pintail with a clutch of 9 eggs were found on 5 June. White-fronted Geese were more common breeders than in the previous years. Only birds of prey were strongly affected by unfavourable weather in the second half of June, as loss of clutches and hatching chicks were recorded in Rough-legged Buzzards during adverse period from 17-20 June. Predation pressure on birds was not considerable, although hunting Arctic Foxes were regularly observed.
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Rodent dynamics:
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| Collared Lemmings and Middendorff's Voles were common, while Siberian Lemmings and Narrow-skulled Voles rare. Both lemming species bred.
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Rodent species recorded:
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| Latin | Abundance |
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| Lemmus sibiricus | rare |
| Dicrostonyx torquatus | common |
| 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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