Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: chamois

Sortuj według:

Ogranicz wyniki do:

Effects of an exceptionally snowy winter on chamois survival

100%

Rughetti M. , Toigo C. , Von Hardenberg A. , Rocchia E. , Festa-Bianchet M.

2011

tom 56

nr 4

Although weather-induced mass mortalities of wild ungulates have been reported, no study has quantified how these episodes may affect the survival of prime-aged adults. Long-term studies of marked ungulates have instead consistently found very weak or no effects of weather on the survival of this age class, particularly for females. We report on the effects of the exceptionally snowy winter of 2008–2009 on three populations of chamois in the western Alps: two in Italy, one in France. In the Alpi Marittime Natural Park in Italy, mortality of prime-aged females (aged 2–9 years) was 43%, about five times higher than reported by previous studies of chamois. Just across the continental divide in the adjacent Mercantour National Park (PNM) in France, however, prime-aged female mortality was only 6%. Senescent females suffered very high mortality in both populations (100% and 56%). In the Gran Paradiso National Park in Italy and in the Alpi Marittime Natural Park, adult male mortality rate was respectively of 81% and 44%, whereas in the PNM, it was only 10%. A recent reduction in population density in the French population, or lower absolute snowfall than in Italy, may explain the difference in survival. Survival of males and prime-aged females can be affected by exceptional weather events, possibly in combination with high population density. Adult chamois of both sexes appeared to show elevated mortality in response to harsh winter conditions. Our results underline the importance of considering sex and age classes in evaluating the impacts of population density in wild ungulates.

Mitochondrial DNA differentiation in chamois [genus Rupicapra]: implications for taxonomy, conservation, and management

100%

Hammer S. , Nadlinger K. , Hartl G. B.

1995

nr 03

Restriction fragment length polymorphisms (RFLPs) of mitochondrial (mt) DNA were used for investigating genetic differentiation in chamois (genus Rupicapra). Digestion of the mtDNAs of 58 individuals from 6 populations with a battery of 16 six-base cutting (restriction endonucleases yielded a total of 67 restriction sites. Based on the presence and absence of these restriction sites a total of 8 haplotypes could be defined. Six of them served for assessing genetic diversity within and among 4 local populations of R. rupicapra rupicapra. Estimates of nucleotide divergence among those haplotypes ranged from 0.05% to 0.25%. One chamois from the High Tatra (subspecies R. r. tatrica) was examined and showed the standard haplotype found in R. r. rupicapra. MtDNA in chamois from Catalunya, belonging to R. pyrenaica pyrenaica, was polymorphic for two haplotypes not found in any population of R. rupicapra. Mean nucleotide divergence among haplotypes found in R. rupicapra and R. pyrenaica was 0.56% (SD = 0.16%). Based on this value, an estimated divergence time of about 280 000 years suggests that the mtDNA lineages of R. rupicapra and R. pyrenaica separated prior to the Riss glacial in the later Pleistocene.

Restitution Tatra chamois [Rupicapra rupicapra tatrica Blahout 1971] to the Nizke Tatry Mts [Central Slovakia]

80%

Backor P. , Velic E.

tom 65

17-25