Wyniki wyszukiwania

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Fostering in European common shrew Sorex araneus [Soricidae, Insectivora]

100%

Haberl W.

Acta Theriologica

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1996

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tom 41

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nr 4

The successful rearing of young Sorex araneus Linnaeus, 1758 by conspecific foster mothers is reported. Nursing shrews showed no aversion towards the presence of strange young in the nest, irrespective of age and size differences, as well as non-familiar odours of these young. Two adults put in the same container with their young showed no signs of aggression, even after successive removal of the young. The observed phenomena suggest that either olfactory cues are not effective at this stage of development or that maternal instinct inhibits the contradictory information of these cues.

2

Does the reduction of locomotor activity serve as an aggression avoidance mechanism in shrews [Soricidae]?

100%

Zwolak R., Rychlik L.

Electronic Journal of Polish Agricultural Universities. Series Biology

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2004

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tom 07

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nr 2

The hypothesis, that shrews avoid intra- and interspecific aggression through a reduction of their loco-motor activity, was tested. In 55 neutral arena tests (each of 30-min-duration), 10 subadult individuals of Sorex minutus, 14 of S. araneus, 9 (including 1 adult male) of Neomys anomalus, and 13 of N. fodiens were used. Loco-motor activity and sum of conflicts (attacks, chases, escapes and threats) in 1st-5th minutes of interactions (phase I) and 10th-15th minutes (phase II) were compared. In all the species, both in intra- and interspecific interactions, a reduction of mobility between phases I and II was observed (in 6 out of 16 comparisons the difference was statistically significant, and in the 7th comparison it was fairly significant). The highest reduction of activity was observed in the smallest S. minutus, and the lowest reduction (no difference was significant) in the largest, dominating N. fodiens.

3

Juvenile dispersal in relation to adult densities in wood mice Apodemus sylvaticus

100%

Plesner J. S.

Acta Theriologica

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1996

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tom 41

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nr 2

Two alternative hypotheses explaining low densities of juvenile wood mice Apodemus sylvaticus (Linnaeus, 1758) early in the breeding season were compared: the Adult Aggression Hypothesis and the Habitat Saturation Hypothesis. They predict different ratios between adult and juvenile densities, which were tested using trapping data from mixed deciduous woodland and from lowland arable field margins. According to the Adult Aggression Hypothesis, juveniles have a poor persistence rate early in the breeding season as a result of aggressive behaviour shown by the adults. As the breeding season progresses, a drop in adult aggression levels results in increased juvenile persistence, which, in turn, leads to increased densities. The Habitat Saturation Hypothesis proposes that juveniles disperse from their parents' territories until the surrounding habitats are saturated and that this gradual saturation results in increased densities as the breeding season progresses. The observed correlations between adult and juvenile densities both in woodland and on field margins were consistent with the predictions of the Habitat Saturation Hypothesis.

4

Perch-site use and inter- and intraspecific aggression of migratory Brown Shrikes [Lanius cristatus] in Southern Taiwan

80%

Yosef R.

Biological Letters

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2004

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tom 41

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nr 2

113-118

Ograniczanie wyników

2 Acta Theriologica

1 Biological Letters

1 Electronic Journal of Polish Agricultural Universities. Series Biology

1 Haberl W.

1 Plesner J. S.

1 Rychlik L.

1 Yosef R.

1 Zwolak R.

2 2004

2 1996

Fostering in European common shrew Sorex araneus [Soricidae, Insectivora]

Does the reduction of locomotor activity serve as an aggression avoidance mechanism in shrews [Soricidae]?

Juvenile dispersal in relation to adult densities in wood mice Apodemus sylvaticus

Perch-site use and inter- and intraspecific aggression of migratory Brown Shrikes [Lanius cristatus] in Southern Taiwan