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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.

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Factors influencing the variation in capture rates of shrews in Southern California, USA

51%

Laakkonen J., Fisher R. N., Case T. J.

Acta Theriologica

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2003

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tom 48

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nr 2

We examined the temporal variation in capture rates of shrews Notiosorex crawfordi (Coues, 1877) and Sorex ornatus (Merriam, 1895) in 20 sites representing fragmented and continuous habitat in southern California, USA. In N. crawfordi, the temporal variation was significantly correlated with the mean capture rates. Of the 6 landscape variables analyzed (size of the landscape, size of the sample area, altitude, edge, longitude and latitude), sample area was positively correlated with variation in capture rates of N. crawfordi. In S. ornatus, longitude was negatively correlated with variation in capture rates. Analysis of the effect of precipitation on the short- and long-term capture rates at 2 of the sites showed no correlation between rainfall and capture rates of shrews even though peak number of shrews at both sites were reached during the year of highest amount of rainfall. A key problem confounding capture rates of shrews in southern California is the low overall abundance of both shrew species in all habitats and seasons.

3

Hemoparasites and fleas of shrews and rodents from Alaska

45%

Laakkonen J., Henttonen H., Hastriter M. W., Niemimaa J., Jarrell G. H.

Acta Parasitologica

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2002

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tom 47

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nr 3

We examined 49 Sorex cinereus, 25 S. tundrensis, 15 S. hoyi, two S. monticolas, two S. ugyunak, 19 Microtus pennsylvanicus, 45 M. oeconomus, 60 M. miurus, 13 Clethrionomys rutilas, six Synaptomys borealis collected from central and northern Alaska in August 2000 for blood parasites. Bartonella sp. was found in blood smears of 2% of S. cinereus, and Trypanosoma sp. in blood smears of 7% M. oeconomus. Meronts of Hepatozoon sp. were detected in lungs of 2% of M. oeconomus and 1.5% of M. miurus. Of possible vectors of blood parasites, species of fleas collected included Amalaraeus dissimilis dissimilis from M. miurus, Peromyscopsylla ostsibirica from S. tundrensis and M. oeconomus, and Corrodopsylla curvata curvata from S. cinereus.

Ograniczanie wyników

2 Acta Parasitologica

1 Acta Theriologica

3 Laakkonen J.

1 Case T. J.

1 Fisher R. N.

1 Hastriter M. W.

1 Henttonen H.

1 Jarrell G. H.

1 Niemimaa J.

1 2004

1 2003

1 2002

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

Factors influencing the variation in capture rates of shrews in Southern California, USA

Hemoparasites and fleas of shrews and rodents from Alaska