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1

Dive types and circadian behaviour patterns of Saimaa ringed seals Phoca hispida saimensis during the open-water season

100%
Kunnasranta M., Hyvarinen H., Hakkinen J., Koskela J. T.
Acta Theriologica
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2002
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tom 47
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nr 1
Diving and circadian behaviour patterns of 7 free-ranging Saimaa ringed seals Phoca hispida saimensis Nordquist, 1899 were examined by VHF-radiotelemetry during open-water seasons between May and November in Lake Saimaa, eastern Finland. The mean recorded dive duration ranged from 2.8 to 6.5 min, with a maximum of 21 min. The mean dive depth ranged from 9.8 to 15.7 m, with maximum of 39.6 m. The maximum dive depth of each seal was limited by water depth in the study area. The dive depths were positively correlated with dive duration and body mass of the seal. Five different dive types were defined, as based on their depth-time characteristics, each falling into one of the three functional categories: travelling, feeding, and resting. Long duration diving bouts occurred mostly at night and were presumed to be resting dives. Saimaa ringed seals exhibited a circadian pattern of haul-out behaviour that shifted seasonally. During molting (May-June) the seals hauled-out both day and night, but later in summer haul-out was more frequent at night.
2

The diet of the Saimaa ringed seal Phoca hispida saimensis

100%
Kunnasranta M., Hyvarinen H., Sipila T., Koskela J. T.
Acta Theriologica
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1999
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tom 44
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nr 4
The diet of the Saimaa ringed seal Phoca hispida saimensis Nordquist, 1899 was studied by the analysis of stomach contents and by feeding trials with a captive seal. Nine prey species were found in the stomachs, the most important being small schooling fish species: perch Perca fluviatilis, roach Rutilus rutilus, vendace Coregonus albula, smelt Osmerus eperlanus and ruff Acerina cernua, The importance of crustaceans in the diet of the ringed seal in Lake Saimaa is insignificant. Length of the intestinal tract of the Saimaa ringed seal is relatively shorter than those of marine ringed seals. In cafeteria tests on one captive seal the preferred fish species were vendace and smelt. The captive seat displayed clear seasonal variation in feeding activity. The consumption of fish was lowest in springtime and highest in autumn and winter.
3
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H.pylori corpus gastritis - relation to acid output

100%
Sipponen P., Hyvarinen H., Siurala M.
Journal of Physiology and Pharmacology
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1996
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tom 47
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nr 1
4

Structure of Phaseolus lunatus testa at its central point

100%
Aniszewski T., Karttunen A. L., Hyvarinen H.
Acta Biologica Cracoviensia. Series Botanica
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2006
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tom 48
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nr 1
In the Phaseolus lunatus seed, the strata and cells of the testa at the central point of the vertical side are described. The proposed regionalization and the central point technique makes it possible to define precisely each site in the testa. Exo-, meso- and endotesta are found to be basic strata in the central point studied. The exotesta is divided into cuticle, palisade and crushed cell layers. The cuticle layer is irregular and noncellular. The palisade cells are exoepidermal sclerenchyma and the crushed cells are former exoepidermal cells. The mesotesta is composed of hourglass cells, called stapes cells here because their form resembles stapes, and crushed cells. The stapes cells are parenchyma. The endotesta is composed of support tissue, three crushed cell layers, phloem, xylem and testa bottom. The endotesta adjoins the cotyledon.
5

Development of indices to estimate fat reserves in the wild American mink (Neovison vison)

76%
Mustonen A.-M., Ahonpaa M., Asikainen J., Hyvarinen H., Lamidi M.-L., Nieminen P.
Acta Theriologica
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2015
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tom 60
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nr 3
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