Techniques of Sexing Beaver, Castor canadensis

Osborn, Dale J.

doi:10.2307/1375754

Cited by 60 publications

(31 citation statements)

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“…All animals were weighed and a subcutaneous microchip was inserted, or previous placement confirmed, under the skin at the back of the neck. The sex of each animal was also confirmed by one or more methods, such as palpation of the baculum (os penis; Osborn, 1955) or the color and viscosity of the anal gland secretions (Rosell and Sun, 1999).…”

Section: Methodsmentioning

confidence: 99%

ESTABLISHMENT OF A HEALTH SURVEILLANCE PROGRAM FOR REINTRODUCTION OF THE EURASIAN BEAVER (CASTOR FIBER) INTO SCOTLAND

Goodman¹,

Girling

Pizzi

et al. 2012

Journal of Wildlife Diseases

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ABSTRACT:In 2009 and 2010 16 Norwegian Eurasian beavers (Castor fiber) were reintroduced to Knapdale, Scotland as part of a 5-yr reintroduction trial (Scottish Beaver Trial). Despite numerous reintroduction programs throughout Europe there is no published information concerning recommended health surveillance during beaver reintroduction and only one publication describing causes of mortality. We describe the establishment of a health surveillance program based on International Union of Conservation of Nature (IUCN) and governmental guidelines, and report preliminary results based on the fecal and blood samples following the completion of the first stage of reintroduction. Animals underwent at least one general anesthetic to allow collection of fecal and blood samples and a thorough clinical examination. No bacterial enteric pathogens such as Salmonella spp., Campylobacter spp., or Yersinia pseudotuberculosis were isolated, nor were Giardia spp. or Cryptosporidium spp. However, numerous helminths including Travassosius rufus and Stichorchis subtriquetrus were detected. Five animals were positive for Leptospira antibodies. This included Leptospira saxkoebing, Leptospira canicola, Leptospira copenhageni, Leptospira icterohaemorrhagiae, Leptospira autumnalis, and Leptospira javanica. The highest loss of animals (20%) was during the statutory 6-mo rabies quarantine period. No common cause of death was determined. The rabies quarantine conditions were waived for four remaining animals, three of which were introduced to the wild successfully. The authors recommend the shortest possible quarantine period when introducing beavers, but allowing for the minimum recommended IUCN 35 days to allow for implementation of the initial stage of the health surveillance program, examination of animals, sample collection, and processing.

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Section: Methodsmentioning

confidence: 99%

ESTABLISHMENT OF A HEALTH SURVEILLANCE PROGRAM FOR REINTRODUCTION OF THE EURASIAN BEAVER (CASTOR FIBER) INTO SCOTLAND

Goodman¹,

Girling

Pizzi

et al. 2012

Journal of Wildlife Diseases

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“…3 monel, National Band and Tag Co., Newport, Kentucky, USA) and measured body mass (±0.01 kg); maximum tail length (±0.1 cm) and width (±0.1 cm); tail thickness at length midpoint, halfway between center and edge of tail (±0.1 mm); and zygomatic arch breadth (±0.1 mm). We determined sex by external palpation (Osborn, 1955), genetic analysis (Williams et al, 2004), or necropsy. We used a razor to collect claw samples from the third toe of the right hind foot, obtaining a thin layer along the dorsal surface from the cuticle to the distal tip.…”

Section: Livetrappingmentioning

confidence: 99%

The role of forage availability on diet choice and body condition in American beavers (Castor canadensis)

et al. 2013

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“…Hancock live traps, sexed by external palpation of the os penis (Osborne 1955) and marked with coloured eartags in 1991-1992. Animals that had not been seen for a full year were assumed to have died in the last year in which they had been observed.…”

Section: Biesbosch 12mentioning

confidence: 99%

Territory and group sizes in Eurasian beavers (Castor fiber): echoes of settlement and reproduction?

Campbell

Rosell

Nolet

et al. 2005

Behav Ecol Sociobiol

118

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According to current theories of territoriality, an animal is expected to defend the smallest area that can provide resources for maximisation of reproduction, known as the 'economically defendable' area. In group territorial species however, the strategies behind resource defence are likely to be more complex with corporate territoriality, cooperative breeding, delayed dispersal and intra-group competition all potentially playing a role. Here we examined group territoriality in a social herbivorous rodent, the Eurasian beaver Castor fiber. Beavers in our study do not inhabit economically defendable territories. Instead the sequence of arrival of pairs into unoccupied areas seems to play a more important role in determining the size of the territory, whereas group size is determined by past reproductive success. We argue that the settlement pattern and reproductive history have a lasting impact in the territorial system of beavers due to a combination of the low adult mortality, high dispersal costs, and avoidance of resource depletion.

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Techniques of Sexing Beaver, Castor canadensis

Cited by 60 publications

References 0 publications

ESTABLISHMENT OF A HEALTH SURVEILLANCE PROGRAM FOR REINTRODUCTION OF THE EURASIAN BEAVER (CASTOR FIBER) INTO SCOTLAND

ESTABLISHMENT OF A HEALTH SURVEILLANCE PROGRAM FOR REINTRODUCTION OF THE EURASIAN BEAVER (CASTOR FIBER) INTO SCOTLAND

The role of forage availability on diet choice and body condition in American beavers (Castor canadensis)

Territory and group sizes in Eurasian beavers (Castor fiber): echoes of settlement and reproduction?

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