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RESPONDENT
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Mikhail Golovatin
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SITE NAME
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Longotyegan River, Polar Urals, Russia
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| Contact
details (phone/fax//e-mail//address): |
| (34992)5-69-10(off.)/5-71-85(fax) // golovatin@ipae.uran.ru // Inst. of Plant and Animal Ecology, 8 Marta St, 202, Ekaterinburg, 620144, Russia |
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PROJECT DETAILS
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Project name:
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Biological Resources of the Polar Urals |
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Start of survey:
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End
of survey:
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Team
size:
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26.06 |
6.07 |
5 |
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WEATHER CONDITIONS
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Weather conditions: |
First half of spring was cold in the north of West Siberia. Snow did not melt until 20.05, snowfalls were frequent, temperatures were below freezing point and dropped to -17-19øC on some days. Arrival of early migrants had been delayed by 1-2 weeks, but mass arrival started after rapid warming on 20.05, and almost all birds arrived from 21-31.05. Rapid warming in the south of the region resulted in ice breaking on the Ob' River at the average time, 31.05, despite cold start of spring. Arrival of most birds was not delayed and reporduction occurred at the average time, due to warm dry weather in the second half of June and July.
The weather was remarkably stable in the study period from 26.06-6.07, with a single cloudy day, 20.06. Precipitaion did not occur, and most days were warm with air temperatures rising to +14-23øC from 8.00-12.00 AM, and from +19-20øC during day time. However, temperatures dropped to +4.5-6øC at night. Strong winds were not recorded. The weather was favourable for reproduction of birds. |
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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: |
low |
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Breeding conditions:
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| Rough-legged Buzzard, Merlin, Long-tailed Skua, Common Gull, Herring Gull, Hooded Crow occurred in low numbers, and their pressure on birds was low to average. |
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Rodent dynamics:
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| A single Collared Lemming was found in a pellet of Rough-legged Buzzard. Total catching effort was 1500 trap/nights, and yielded an average total density of rodents 1.7 vole per 100 trap/nights, including 0.7 in Grey-sided Vole, 0.5 in Middendorff's Vole, 0.2 in Short-tailed Vole, 0.2 in Northern Red-backed Vole and 0.1in Narrow-skulled Vole. Numbers of voles were low in the study period, but they bred intensively, and could have reached average density in mid July.
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Rodent species recorded:
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| Latin | Abundance |
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| Dicrostonyx torquatus | rare |
| Microtus agrestis | rare |
| Clethrionomys rufocannus | rare |
| Clethrionomys rutilus | rare |
| Microtus middendorffi | rare |
| Microtus gregalis | rare |
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Summary
of fauna studies: |
| Numbers, habitats and data on biology planned for publication in the "Russian Ornithologial Journal". |
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