WebOct 17, 2006 · Abstract. Population size of European otters (Lutra lutra) was estimated in Pollino National Park (southern Italy) by genetic typing of fresh feces collected in the … WebMay 1, 2024 · More information: Roderick B. Gagne et al, Measures of effective population size in sea otters reveal special considerations for wide-ranging species, Evolutionary Applications (2024). DOI: 10. ...
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WebOct 16, 1998 · Sea otter populations, meanwhile, have declined by about 25 percent each year during the 1990s throughout large areas of western Alaska. In waters inaccessible to killer whales, however, sea otter ... WebFeb 21, 2024 · With mean otter densities ranging from 0.16 to 0.28 otters per stream kilometre (including all otters regardless of their status), and mean densities of estimated otters per stream kilometre ranging from 0.17 to 0.34, our results are in line with other studies investigating otter densities in riverine habitats, where otter populations have …
WebFeb 28, 2003 · The population decline likely began in the mid-1980s and declined at a rate of 17.5%/year in the 1990s. The minimal population estimate was 8,742 sea otters in 2000. The population declined to a uniformly low density in the archipelago, suggesting a common and geographically widespread cause. WebOct 26, 2015 · Turvey and Risely concluded from a population viability analysis that the extinction of Steller’s sea cows in the Commander Islands was an inevitable consequence of human exploitation; the pre-exploitation size of this remnant population was larger than Stejneger’s often-cited estimate of 1,500 individuals, and contrary to proposals by …
WebPopulation size and distribution. GB population 11,000. GB IUCN: Least concern. But in Scotland and Wales, they are considered Vulnerable. ... WebFrom 1977-1995, the population showed steady growth and averaged 19.1% growth over this time period (Nichol, 2002). Although the sea otter was extirpated from the Canadian West Coast, it was reintroduced and once again become a part of the ecosystem, as shown in figure 1. Over recent years, the status of the sea otter was upgraded from ...
WebOtters are largely solitary, semi-aquatic mammals that get most of their food from lochs, rivers or the sea. The Scottish population has an unusually high proportion (perhaps 50% or more) of coastal-dwelling individuals, …
The 13 species range in adult size from 0.6 to 1.8 m (2.0 to 5.9 ft) in length and 1 to 45 kg (2.2 to 99.2 lb) ... Group showed that otter attacks reported between 1875 and 2010 occurred most often in Florida, where human and otter populations have substantially increased since 2000, ... See more Otters are carnivorous mammals in the subfamily Lutrinae. The 13 extant otter species are all semiaquatic, aquatic, or marine, with diets based on fish and invertebrates. Lutrinae is a branch of the Mustelidae See more The word otter derives from the Old English word otor or oter. This, and cognate words in other Indo-European languages, ultimately stem … See more The gestation period in otters is about 60 to 86 days. The newborn pup is cared for by the bitch, dog, and older offspring. Female otters reach sexual maturity at approximately two years of age and males at approximately three years. The holt is built under tree … See more For most otters, fish is the staple of their diet. This is often supplemented by frogs, crayfish and crabs. Some otters are experts at opening shellfish, and others will feed on available small mammals or birds. Prey-dependence leaves otters very vulnerable to prey depletion. … See more An otter's den is called a holt or couch. Male otters are called dogs or boars, females are called bitches or sows, and their offspring are called pups or cubs. The collective nouns for otters are bevy, family, lodge, romp (being descriptive of their often playful … See more Otters have long, slim bodies and relatively short limbs. Their most striking anatomical features are the powerful webbed feet used to swim, and their seal-like abilities for … See more Hunting Otters have been hunted for their pelts from at least the 1700s, although it may have begun well before then. Early hunting methods included darts, arrows, nets and snares but later, traps were set on land and guns used. See more maschera con filtriWebOct 1, 2006 · Accordingly, the 3440 grid cells of otter occurrence in Italy could likely host about 8000 otters, suggesting the current population has become larger than the minimum viable population size. View ... data validation no duplicates excelWebAug 18, 2024 · Historic population sizes, like the otters themselves, are fuzzy. But global estimates suggest sea otters numbered 150,000-300,000 in the early 1700s. By 1911, ... data validation node