Wyniki wyszukiwania

1

Changes in the behaviour of a male Eurasian badger: evidence in favour of the anti-kleptogamy hypothesis?

100%

Revilla E., Palomares F.

Acta Theriologica

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1999

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tom 44

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nr 4

We report a case of male badger Meles meles (Linnaeus, 1758) territorial expansion after the removal, by poaching activity, of a neighbouring male in an area of low badger density. The most plausible reason for the behaviour of this male is the gaining of the access to the females of the adjacent territory because: the male spent approximately half of his active time inside the new area, made a similar effort as the previous male in sleeping together with the new breeding female and did not use the summer-autumn feeding areas of the taken range. While considering that data have come from only one animal, it is discussed the key importance of female access against food resources and shelter when explaining male badger spatial behaviour, at least in low density populations.

2

Estimating the size of European rabbits consumed by predators: Relationship between body mass and tooth dimensions

80%

Calzada J., Haydon D. T., Palomares F.

Acta Theriologica

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2003

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tom 48

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nr 1

A method for estimating body mass of European rabbitsOryctolagus cuniculus (Linnaeus, 1758) based on tooth dimensions is proposed. Regression models identified significant relationships between the body mass of 87 rabbits and individual tooth length, breadth, product of tooth length and breadth, and whether or not the individual was infected with myxomatosis. Dimensions of 10 of 14 different teeth explained over 80% of variation in body mass, and those teeth were selected as adequate predictors of rabbit body mass. Models were tested using teeth from 16 additional rabbits of known body mass. Body mass, predicted on the basis of 9 of the 10 selected teeth, was statistically indistinguishable from the observed values for all 16 individuals. When myxomatosis infection status of the rabbit was included in the model, all 10 selected teeth yielded predictions statistically indistinguishable from those observed. Prediction errors can be computed permitting statistical comparison of the average predicted value of body mass from different samples of rabbits. The model is useful in estimating rabbit body masses from teeth recovered from feces of predators and it will facilitate testing of hypotheses on size-selective predation. The method was applied to rabbit teeth found in fecal samples from the Iberian lynxLynx pardinus collected over a one-year period. Lynx preyed preferentially upon younger rabbits during the peak breeding period of this lagomorph.

3

Habitat preference of large grey mongooses Herpestes ichneumon in Spain

80%

Palomares F., Delibes M.

Acta Theriologica

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1990

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tom 35

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nr 1-2

4

Winter circadian activity pattern of free-ranging coypus in the Parana River Delta, eastern Argentina

71%

Palomares F., Bo R., Beltran J. F., Villafane G., Moreno S.

Acta Theriologica

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1994

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tom 39

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nr 1

During August 1990, 3 male and 3 female coypus Myocastor coypus (Molina, 1782) were radiotracked for 42 24-h periods at the Delta of Paraná River, Argentina. Coypus were mainly nocturnal, with activity peaks around one hour after sunset and two hours before sunrise. Movement rate peaked between 02.00 and 04.00 o'clock. This pattern is similar to that observed in captive individuals and introduced feral populations. Among 7 environmental factors (day period, temperature, wind, cloud cover, and presence or absence of moon, fog, and rain) only period of day and rainfall during daylight were found significantly related to coypu activity, but no environmental factor influenced coypu nocturnal rate of movement.

Ograniczanie wyników

4 Acta Theriologica

4 Palomares F.

1 Beltran J. F.

1 Bo R.

1 Calzada J.

1 Delibes M.

1 Haydon D. T.

1 Moreno S.

1 Revilla E.

1 Villafane G.

1 2003

1 1999

1 1994

1 1990

Changes in the behaviour of a male Eurasian badger: evidence in favour of the anti-kleptogamy hypothesis?

Estimating the size of European rabbits consumed by predators: Relationship between body mass and tooth dimensions

Habitat preference of large grey mongooses Herpestes ichneumon in Spain

Winter circadian activity pattern of free-ranging coypus in the Parana River Delta, eastern Argentina