What is the average wolf litter size




















Packs of 20 to 30 wolves sometimes occur, and these larger packs may have two or three litters of pups from more than one female. The social order in the pack is characterized by a separate dominance hierarchy among females and males.

In most areas wolf packs tend to remain within a territory used almost exclusively by pack members, with only occasional overlap in the ranges of neighboring packs. Despite a generally high birth rate, wolves rarely become abundant because mortality is also high.

In much of Alaska, the major sources of mortality are: predation by other wolves; hunting; and trapping. Diseases, malnutrition, and accidents also help regulate wolf numbers. Predation by other wolves is a major cause of death because wolves defend their territories from other wolves. Dispersing wolves e. Typically one female wolf in a pack has a litter of about seven pups each year. This varies, in some packs more than one female may bring off a litter.

In some cases a pair of wolves may not form a pack or belong to a pack, and will bring off a litter of pups. The rate at which wolves kill large mammals varies with prey availability and environmental conditions.

A pack may kill a deer or moose every few days during the winter. At other times, they may go for several days with almost no food. Since wolves are opportunistic, young, old, or debilitated animals are preyed upon more heavily than healthy middle-age animals. Under some circumstances, however, such as when snow is unusually deep or prey is scarce, even animals in their prime may be vulnerable to wolves. In Southeast Alaska, Sitka black-tailed deer, mountain goats, and beaver are the most important sources of food.

Research indicates that salmon are important seasonally where they are available, especially to young wolves. During summer, small mammals including voles, lemmings and ground squirrels are taken.

Wolves also scavenge, and coastal wolves will beach comb. The wolf occurs throughout mainland Alaska, on Unimak Island in the Aleutians, and on all of the major islands in Southeast except Admiralty, Baranof, and Chichagof. This range includes about 85 percent of Alaska's , square-mile area. Wolves are adaptable and exist in a wide variety of habitats extending from the rain forests of the Southeast Panhandle to the arctic tundra along the Beaufort Sea. Alaska is home to an estimated 7, to 11, wolves.

A 1-Mb resolution radiation hybrid map of the canine genome. Proceedings of the National Academy of Sciences : — Haber G. Biological, conservation, and ethical implications of exploiting and controlling wolves. Conservation Biology 10 : — Harrington F. Wolf howling and its role in territory maintenance. Behaviour 68 : — An analysis of howling response parameters useful for wolf pack censusing. Journal of Wildlife Management 46 : — Holmes N. Dickens H. Parker H. Binns M.

Mellersh C. Sampson J. Eighteen canine microsatellites. Animal Genetics 26 : — Strange N. Three polymorphic canine microsatellites. Animal Genetics 25 : Genetic diversity and relatedness within packs in an intensely hunted population of wolves Canis lupus.

Acta Theriologica 50 : 3 — Jones A. Ardren W. Methods of parentage analysis in natural populations. Molecular Ecology 12 : — Joslin P. Movements and homesites of timber wolves in Algonquin Park.

American Zoologist 7 : — Lehman N. Clarkson P. Meier T. Behavioral Ecology and Sociobiology 30 : 83 — Liberg O. Severe inbreeding depression in a wild wolf Canis lupus population.

Biology Letters 1 : 17 — Livingston T. Gipson P. Sanchez D. Krausman P. Scat removal: a source of bias in feces-related studies. Wildlife Society Bulletin 33 : — Lynch M. Ritland K. Estimation of pairwise relatedness with molecular markers. Genetics : — Idaho wolf recovery program: restoration and management of gray wolves in central Idaho. Babcock I. Mack C Rachael J. Husseman J. Lucid M. Thomas B. Wolf conservation and management in Idaho. Burch J. The wolves of Denali. University of Minnesota Press , Minneapolis.

Wolf social ecology. Nelson M. Non-family wolf Canis lupus packs. Canadian Field-Naturalist : — Pack structure and genetic relatedness among wolf packs in a naturally-regulated population. Fritts S. Seip D. Miller C. Joyce P. Waits L. Assessing allelic dropout and genotype reliability using maximum likelihood. Nadeau M. Onorato D. White C. Detection of predator presence at elk mortality sites using mtDNA analysis of hair and scat samples.

Wildlife Society Bulletin 34 : — Ostrander E. Sprague G. Rine J. Identification and characterization of dinucleotide repeat CA n markers for genetic-mapping in dogs. Genomics 16 : — Packard J. Wolf behavior: reproductive, social, and intelligent. Population regulation in wolves.

Malpass R. Klein H. Peakall R. Smouse P. GenAlEx 6: genetic analysis in Excel. Population genetic software for teaching and research. Molecular Ecology Notes 6 : — Pemberton J. Wild pedigrees: the way forward. Proceedings of the Royal Society of London, B. Biological Sciences : — Estimating relatedness using molecular markers. Evolution 43 : — Raymond M.

Rousset F. R Development Core Team. R: a language and environment for statistical computing. Accessed 16 December Rice W. Analyzing tables of statistical tests. Rutledge L. Patterson B. Mills K. Loveless K. Murray D. White B. Protection from harvesting restores the natural social structure of eastern wolf packs. Biological Conservation : — Santini A. Lucchini V. Fabbri E. Randi E. Molecular Ecology Notes 7 : — Seddon J. Canid-specific primers for molecular sexing using tissue or non-invasive samples.

Conservation Genetics 6 : — Smith D. Is incest common in gray wolf packs? Behavioral Ecology 8 : — Stenglein J. Impacts of sampling location within a faeces on DNA quality in two carnivore species. Molecular Ecology Resources 10 : — Efficient, noninvasive genetic sampling for monitoring reintroduced wolves.

Thiel R. Merrill S. Tolerance by denning wolves, Canis lupus , to human disturbance. Rocky mountain wolf recovery annual report. Valiere N. Molecular Ecology Notes 2 : — Van Ballenberghe V.

Two litters raised in one year by a wolf pack. Journal of Mammalogy 64 : — Visser M. Keeping up with a warming world; assessing the rate of adaptation to climate change. Proceedings of the Royal Society London, B.

Stahler D. Earl D. Pollinger J. The genealogy and genetic viability of reintroduced Yellowstone grey wolves. Molecular Ecology 17 : — Luikart G. Taberlet P. Estimating the probability of identity among genotypes in natural populations: cautions and guidelines. Molecular Ecology 10 : — Walker F. Taylor A. Sunnucks P. Female dispersal and male kinship-based association in southern hairy-nosed wombats Lasiorhinus latifrons. Wang J. Informativeness of genetic markers for pairwise relationship and relatedness inference.

Theoretical Population Biology 70 : — Triadic IBD coefficients and application to estimating pairwise relatedness. Genetical Research 89 : — Molecular Ecology Resources 11 : — Weaver J. Comparison of coyote and wolf scat diameters. They communicate at this young age by making noise such as squeaking, whining and grunting. They do this most often when they are hungry or Mom is too far away. At this age, Mom is bonding with her babies and has a lot of work to do. She licks them to keep them clean.

She even licks her pups to stimulate them to urinate and defecate—to pee and poop! If Mom needs a break from the pups, sometimes Dad or other wolves in the pack will babysit. All members of the pack take care of the puppies and are very protective if intruders come into the area. Mom may even gently carry her puppies in her mouth to move them to another den site if the pack feels threatened. When hungry, the pups will go up to any adult and lick their muzzles. The pack members find this irresistible and will regurgitate food for the pups.

They are also scavengers so they look for carcasses of dead animals, called carrion, to snack on. The pups start using more of the communications that adults use, such as moaning, growling, yelping, woofing, and whining. Around this time, they also step outside of their den for the first time and will start howling as well. Soon after, they join in the daily chorus howls with the entire pack. It is like a family sing-along!

Soon, the toddler pups become more independent and need less attention from Mom. Scientists think playing like this helps pups develop skills they will need as adults and also helps them bond as a family. At this stage, conflict behavior has been observed when food is around.

If a pup becomes protective of a piece of food they may warn others to stay away. This is done by growling or making little lunges at an approaching sibling.

The pups also start caching hiding food—just like adult wolves do—so they have something to snack on later. By now, the pups have sharp little teeth. They use their mouths to engage with adults by playing with them and soliciting food and attention. Since pups use their mouths to play and communicate, they sometimes hurt other pack members by accidentally biting too hard! Pups also can get a bit rowdy! Adult wolves will discipline them by snapping or lunging at them—but they never hurt the pups.

It just gets their attention! If they are mobile enough to accompany adult wolves on a hunt, the pups begin to understand that their low-pitched, long howls help them talk to one another over vast territories. They still lack the skills to survive, but they now feed on kills with the rest of the pack. Four to Eight Months Old The pups grow very rapidly over the summer and though they are not yet full adults when fall comes, they can start to go hunting with the pack.

When hunting in the fall and winter months, wolves in North America are looking for large mammals, such as deer, moose, and elk. Wolves can survive on as little as 1. This style of eating is called feast or famine.

Wolves have established territories that they will generally defend from other packs. This can lead to fights between the two packs, which may result in the deaths of some members. Wolves hunt as a team, taking down prey with teeth and teamwork, unlike solitary hunters like mountain lions and bears that also use their sharp claws and strength.



0コメント

  • 1000 / 1000