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SITE NAME
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Pyasina River mouth (Lidia Bay), Russia
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| Contact
details (phone/fax//e-mail//address): |
| // // Stichting WIWO, c/o Drietergscweg 16^, 3708 jb, Zeist, the Netherlands |
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PROJECT DETAILS
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Project name:
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WIWO Taimyr Expedition 1993 |
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Start of survey:
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End
of survey:
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Team
size:
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7.06 |
11.08 |
11 |
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WEATHER CONDITIONS
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Weather conditions: |
| Spring was rather late: by 17 June only 50% of snow had melted, but due to warm weather in the last week of June the remaining snow melted quickly and river ice broke up on 1 July. July was dry and cold (average temperatures about 0øC). Frosts occurred between 15 to 20 July and were accompanied by strong, stormy winds and frequent snowfalls. Such weather conditions caused mortality of some chicks, especially those which were still in nests. |
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| Date of 50%
snow-cover: |
16.06 |
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| Date of ice-break
on rivers: |
1.07 |
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| Date of final loss
of snow: |
6.07 |
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BIOTIC CONDITIONS
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| Rodents abundance evaluation: |
low |
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Breeding conditions:
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| About half the Arctic Fox dens were occupied and the family size was large. Among waders Little Stint, Pacific Golden Plover, Dotterel and Curlew Sandpiper were the most numerous. Nest-failure of waders from predation was low: calculated probability of nest survival up to hatching was 78% (data combined for all species), and 80% for Little Stint. |
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Rodent dynamics:
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| Numbers of Siberian and Collared Lemmings were low (respectively 0.78 and 0.32 ind./100 traps/day), but the number of pregnant females allowed the prediction of an increase in numbers after late August. Lemming index 1.7 in Spaans et al. 1998 corresponds to average abundance.
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Rodent species recorded:
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| Latin | Abundance |
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| Lemmus sibiricus | rare |
| Dicrostonyx torquatus | rare |
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Summary
of fauna studies: |
| A short report has been published in October 1993, a definitive report is expected in 1995. |
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