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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.

2

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Feeding ecology of the American crab Rhithropanopeus harrisii (Crustacea, Decapoda) in the coastal waters of the Baltic Sea

84%

Hegele-Drywa J., Normant M.

Oceanologia

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2009

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tom 51

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nr 3

361-375

The feeding ecology of the American crab Rhithropanopeus harrisii Gould, 1841 from brackish waters of the Baltic Sea was studied by analyses of the stomach repletion index (SRI) and stomach content with regard to sex, size and habitat (Dead Vistula River and the Gulf of Gdańsk). Neither the sex nor the size of an individual crab had a significant (P>0.05) influence on the SRI or on the diversity of food items found in the stomachs of R. harrisii. But the type of food consumed was significantly (P<0.05) dependent on the locality inhabited: the greater the biodiversity of the habitat, the richer the dietary composition. In Baltic coastal waters this species feeds on detritus, and also on animal and plant matter. Remains of Chlorophyta, Amphipoda, Ostracoda, Polychaeta, Gastropoda and Bivalvia were found in the stomachs of the specimens analysed.

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Diet of free-ranging American mink and European polecat in Denmark

84%

Hammershoj M., Thomsen E. A., Madsen A. B.

Acta Theriologica

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2004

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tom 49

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nr 3

Stomach and intestine contents of 211 American mink Mustela vison Schreber, 1777 from two areas (Thy and Bornholm) in Denmark and stomach contents of 47 polecats M. putorius Linnaeus, 1758 from Thy were analysed. Sympatric mink (from Thy) preyed mostly on mammals (55% occurrence), followed by amphibians (36%), birds (33%) and fish (30%), whereas polecat preyed mostly on amphibians (87%) and mammals (34%), and only occasionally on birds (9%) and fish (6%). Allopatric mink (from Bornholm) preyed mostly on birds (50%), followed by mammals (42%), fish (25%) and amphibians (4%). With the possible exception of some amphibians, no endangered species were found in their diet. No differences were found in food composition between wild and escaped farm mink. The concern that mink in general might have a detrimental effect on its prey species and other mustelids in terms of food competition in Denmark may be unjustified. It cannot be ruled out, however, that mink may locally have a seriously negative effect on some specific prey species, and clearly, more data is needed on eg prey abundance and spring and summer mink diet, to make stronger conclusions.

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Functional stomach chamber strategy of red deer in relation to sex and mating season

67%

Siuta A.

Medycyna Weterynaryjna

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2006

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tom 62

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nr 07

773-777

Stomach chambers of hinds (H), winter (WB) and rutting bulls (RB) of red deer (Cervus elaphus L.) were examined during the fall hunting season and wintertime. The stomach content of bulls was the highest (P>0.01) in winter (WB, 19.0 kg) and the lowest (RB, 3.7 kg) during rutting season. But the relative food content for total stomach (IR index) as well as for rumen (180.2), abomasum (4.1) and omasum (7.4) was the greatest in hinds (H). However, the total stomach tissue (SCT) weight increased together with the enhancement of carcass weight (Cw), the percentage of participation relative SCT to Cw, thus by contrast the IW index was the lowest P>0.01 in the heaviest RB (2.23). For WB it equaled 4.03 and for H - 3.99. Moreover, the total stomach volume, Iᵥ index was the highest in hinds (82.90) and differed P>0.01 from that of RB which was the lowest (36.70). Similar trends occurred in the individual stomach chamber areas. The greatest IT index-expressing ratio of stomach tissue weight to its area was markedly (P>00.5) higher in RB (0.20) in comparison to the remaining groups (WB 0.11, H 0.09), indicating a thicker and shrunken stomach wall. The study demonstrates that variability in the stomach chambers (its characteristics and indexes) of female and male deer depend upon seasonal physiological changes, including the most important season, which is the mating season. Stomach size and its individual chamber indexes are consequences of diet segregation and different feeding behavior between sexes, including foraging activity of males in the rutting season.

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Occurrence and distribution of parasites in relation to food components of grey gurnard, Eutrigla gurnardus (L.) (Teleostei: Scorpaeniformes), off the Shetland Islands

67%

Sobecka E., Wiecaszek B., Luczak E., Antoszek A.

Oceanological and Hydrobiological Studies

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2014

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tom 43

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nr 3

6

Food spectrum of the omnivorous rotifer Asplanchna priodonta in two large Northeastern European lakes of different trophy

67%

Oganjan K., Virro T., Lauringson V.

Oceanological and Hydrobiological Studies

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2013

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tom 42

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nr 3

7

Winter diets of wolf Canis lupus and lynx Lynx lynx in Estonia and Latvia

67%

Valdmann H., Andersone-Lilley Z., Koppa O., Ozolins J., Bagrade G.

Acta Theriologica

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2005

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tom 50

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nr 4

521-527

Winter diets of wolfCanis lupus Linnaeus, 1758 and lynxLynx lynx Linnaeus, 1758 in Latvia and Estonia were investigated in 1997–2000 based on stomach contents of hunted animals and scats. Ungulates appeared to be the staple food for both predators. Lynx diet to a high extent consisted of cervids (Estonia 52% frequency of prey, Latvia 88%), roe deer dominating. Mountain hareLepus timidus made up from 9% (Latvia) to 31% (Estonia) of the lynx diet, and red foxVulpes vulpes 7% in Estonian sample. Wolf diet was more diverse; besides cervids (44% in Latvia, 63% in Estonia) it included wild boar Sus scrofa (32% in Latvia, 17% in Estonia), carrion, small rodents, and other food items. Proportion of empty stomachs was high both in wolves (37%) and lynxes (35%) in Latvia. Range of stomach content weights varied from zero to more than 4 kg in wolves and almost 1.5 kg in lynx. Pianka’s indices of food niche overlapped significantly between species and countries (0.85–0.99).

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Winter diet of Great Pampa-finches Embernagra platensis in Guamini Lagoon, Argentina

67%

Montalti D., Ferman L. M., Camperi A. R., Soave G. E., Arambarri A. M., Darrieu C. A.

Acta Ornithologica

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2005

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tom 40

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nr 1

79-82

The diet of the Great Pampa-finch includes seeds rather than insects. Our objective was to study its diet during the winter season and, whenever possible, to record differences between the sexes in diet patterns. This species was studied at Guaminí Lagoon, Buenos Aires Province, Argentina. The stomach content of 38 adult birds was investigated. The analysis shows that the food eaten by E. platensis consisted of seeds (60%) (Chenopodiaceae, Asteraceae, Ciperaceae and Poaceae) and insects (39%) (Bellostomatidae, Dytiscidae, Curculionidae, Coccinelidae, Formicidae and Apidae). Males ate more insects and, overall, more items than females. These, in turn, consumed a greater amount of plants. Niche breadth values were 2.9 for males and 3.1 for females. The seeds encountered were those of plant species typically associated with the pampas.

Ograniczanie wyników

The diet of the Saimaa ringed seal Phoca hispida saimensis

Feeding ecology of the American crab Rhithropanopeus harrisii (Crustacea, Decapoda) in the coastal waters of the Baltic Sea

Diet of free-ranging American mink and European polecat in Denmark

Functional stomach chamber strategy of red deer in relation to sex and mating season

Occurrence and distribution of parasites in relation to food components of grey gurnard, Eutrigla gurnardus (L.) (Teleostei: Scorpaeniformes), off the Shetland Islands

Food spectrum of the omnivorous rotifer Asplanchna priodonta in two large Northeastern European lakes of different trophy

Winter diets of wolf Canis lupus and lynx Lynx lynx in Estonia and Latvia

Winter diet of Great Pampa-finches Embernagra platensis in Guamini Lagoon, Argentina