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Population fluctuations of the wood lemming Myopus schisticolor in Eastern and Western Finland

100%

Eskelinen O., Sulkava P., Sulkava R.

Acta Theriologica

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2004

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tom 49

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nr 2

From 1982 to 2003 we studied fluctuations in populations of the wood lemming Myopus schisticolor (Liljeborg, 1844) in the Heinävesi (eastern Finland) and Keuruu regions (western Finland) by counting field signs and dead animals in standardized field surveys. We compared the population fluctuations of lemmings to those of other voles, owls and small mustelids in these regions. The lemming population in Heinävesi fluctuated regularly in 3-year cycles and in synchrony with the field vole popu- lation. i Populations of owls also fluctuated in synchrony with wood lemming and field vole populations. In the Keuruu region, oscillations in the wood lemming population were irregular, and neither lemming and vole populations nor lemming and owl populations were correlated. Although direct mechanistic evidence is lacking, specialist predators such as weasels and owls probably cause the cyclicity in the field vole and wood lemming populations in the Heinävesi area. On the other hand, scarcity of high-quality habitats, unfavourable winter weather conditions and generalist predators may prevent the development of cyclicity in the wood lemming population of Keuruu.

2

Hepatozoonosis and trypanosomiasis in Norwegian lemmings, Lemmus lemmus, from Finland

100%

Laakkonen J.

Acta Parasitologica

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2004

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tom 49

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nr 4

Of the 55 lemmings captured in northern Finland in 1998, five had disseminated Hepatozoon sp. infection. Besides lungs, meronts were seen in the heart, kidney, liver and/or spleen. In the lungs, also visible were dizoic cysts, and merozoites engulfed by macrophages in a microgranuloma. The trypomastigotes detected in the plasma of eight of the lemmings differed in size, and in other morphological characteristics from those seen in this host species elsewhere. The mean hematocrit of the lemmings with disseminated hepatozoonosis was lower (39.6) than that reported from wild lemmings with no noticeable parasites (45), but the hematocrit values of the Trypanosoma sp. infected lemmings were within the normal range.

3

Revision of fossil lemmings [Lemminae] from Poland with special reference to the occurrence of Synaptomys in Eurasia

100%

Abramson N., Nadachowski A.

Acta Zoologica Cracoviensia

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2001

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tom 44

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nr 1

4

Lemmings [Mammalia, Rodentia] as indicators of temperature and humidity in the European Quaternary

70%

Kowalski K.

Acta Zoologica Cracoviensia

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1995

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tom 38

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nr 1

Ograniczanie wyników

2 Acta Zoologica Cracoviensia

1 Acta Parasitologica

1 Acta Theriologica

1 Abramson N.

1 Eskelinen O.

1 Kowalski K.

1 Laakkonen J.

1 Nadachowski A.

1 Sulkava P.

1 Sulkava R.

2 2004

1 2001

1 1995

Population fluctuations of the wood lemming Myopus schisticolor in Eastern and Western Finland

Hepatozoonosis and trypanosomiasis in Norwegian lemmings, Lemmus lemmus, from Finland

Revision of fossil lemmings [Lemminae] from Poland with special reference to the occurrence of Synaptomys in Eurasia

Lemmings [Mammalia, Rodentia] as indicators of temperature and humidity in the European Quaternary