Wyniki wyszukiwania

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Courtship and behavioral maturation of male mouflons

100%

Bon R., Recarte J. M., Gonzalez G., Cugnasse J. M.

Acta Theriologica

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1995

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tom 40

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nr 3

This study fails to find qualitative differences in courtship (ie intra- and intersexual interactions), according to maie age in mouflon Ovis gmelini musimon (Pallas, 1811). Conversely, clear age differences arose concerning the proportion of time males dedicated to reproductive and non-reproductive activities. During the rut, males spent less time feeding, and more time scanning and in male-male interactions as age increased. Young males (< 2 years old) interacted much less agonistically with other males and courted females twice ¡ess than oldest males (> 7 years old). So male behavioral maturation does not only depend on age but could also be influenced by demographic constraints, ie presence of old dominant males. The male reproductive effort, however, seemed independent of the presence of old dominant males, which could reflect a developmental constraint. Young males would not have enough energy reserves because of growth to dedicate as much time as mature males to reproduction, even in the absence of these latter.

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Ram rut-involvement in a hunted population of mouflons

100%

Bon R., Gonzalez G., Bosch M. D., Cugnasse J. M.

Acta Theriologica

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1992

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tom 37

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nr 1-2

This study was conducted during the rut in a protected valley (Vialais) inhabited by one permanent population of ewes. This valley formes part of a larger hunted area. Rams which segregate from ewes entered the Vialais during the pre-rut, first young rams while the oldest rams arrived later. These latter stay in the company of ewes only when most lambs are conceived. The removal of old males shifted the male population structure, favoring young males. Old males tended a low proportion of ewes in mating groups which was used as an index of the male mating success. A larger proportion of young males successfully tended estrous ewes than in protected populations of wild sheep. Despite that, the population is highly productive which contradicts the arguments that precocious involment of young males in reproduction may be detrimental to population productivity.

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Effect of observer experience on the monitoring of a mouflon population

76%

Garel M., Cugnasse J. M., Gaillard J. M., Loison A., Santosa Y., Maublanc M. L.

Acta Theriologica

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2005

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tom 50

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nr 1

Analysis of changes in population size can be severely biased when factors related to the acquisition of data, such as differences between observer experience and changes through time in the ability of individual observers to detect animals, are not controlled for. We analysed the effect of observer qualification on the number of groups and individuals observed during two census days of a mouflonOvis gmelini musimon xOvis sp. population. The difference between professional wildlife biologists and volunteers was strong during the census day one (87 groups and 410 mouflons vs 55 and 249 by experienced observers and volunteers, respectively) but decreased significantly on the second day for the number of animals detected (390 vs 292 mouflons by experienced observers and volunteers, respectively). Our result indicates that additional training will enhance reliability of data obtained from volunteers. Given the effect of observer qualification on performance during the census, we recommend to use observers of similar and adequate qualification in population counts.

Ograniczanie wyników

3 Acta Theriologica

3 Cugnasse J. M.

2 Bon R.

2 Gonzalez G.

1 Bosch M. D.

1 Gaillard J. M.

1 Garel M.

1 Loison A.

1 Maublanc M. L.

1 Recarte J. M.

1 Santosa Y.

1 2005

1 1995

1 1992

Courtship and behavioral maturation of male mouflons

Ram rut-involvement in a hunted population of mouflons

Effect of observer experience on the monitoring of a mouflon population