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Sökning: WFRF:(von Schantz T)

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  • Erlinge, S, et al. (författare)
  • Predation on brown hare and ring-necked pheasant populations on southern Sweden
  • 1984
  • Ingår i: Holarctic Ecology. ; 7:3, s. 300-304
  • Tidskriftsartikel (refereegranskat)abstract
    • in an open field area in southern Sweden. Biomass and numbers of hares and pheasants eaten by the predators were calculated from data on food habits, food requirements, and numbers of the mammalian and avian predators present (11 species). At the same time estimates of numbers and production of hares and pheasants were obtained. At least 40% of the estimated annual production of hares and almost 60% of subadult-adultp heasants in autumn were consumed by the predators. Estimated numbers of hares and pheasants taken by the predators greatly exceeded shootinga nd road mortality.F oxes and cats were the predominantp reda-tors on hares( about9 0%o f total harec onsumption). Foxesa ccountedf or aboutt wo-thirds of predation on pheasants; cats and goshawks were of secondary importance. Pheasant nests were preyed upon by hooded crows and also by badgers. Hares and pheasantsc ontributedo nly about 3 and 1%, respectively,o f the food of the predators. 
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  • Göransson, Görgen, et al. (författare)
  • Male characteristics, viability, and harem size in a wild population of pheasants.
  • 1990
  • Ingår i: Animal Behaviour. - 0003-3472 .- 1095-8282. ; 40:1, s. 89-104
  • Tidskriftsartikel (refereegranskat)abstract
    • A population of pheasants was studied for 4 years in southern Sweden to determine how sexual selection operates among males. Morphological characters, viability, dominance, territory quality, date of territorial establishment, harem size and reproductive success of males were measured; 81 males and 101 females were radio-tracked. The spur length of males was the most important predictor of harem size. Phenotypic condition and viability were significantly related to spur length, the best single predictor of the reproductive success of males. These are the first data to show that a sexually selected male character correlates significantly with male viability. The results support models suggesting that viability-based processes can contribute to the evolution of mate choice and secondary sexual characters. 
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