We tested the hypothesis that a main function of territory marking in European beaver (Castor fib... more We tested the hypothesis that a main function of territory marking in European beaver (Castor fiber) is defence of the territory. The results showed that:1) beaver colonies with close neighbors scent-mark more often than isolated ones; 2) the number of scent markings increased significantly with the number of neighboring territories and individuals, the mean distance to all other territories, duration
Rosell, F. & Sun, L. 1999: Use of anal gland secretion to distinguish the two beaver species Cast... more Rosell, F. & Sun, L. 1999: Use of anal gland secretion to distinguish the two beaver species Castor canadensis and C. fiber. - Wildl. Biol. 5: 119-123. Introduced North American beavers Castor canadensis pose a potential threat to the continuing recovery of Eurasian beaver C. fiber populations in several European countries. For management purposes, it is necessary to be able
Beaver (Castor spp.) normally scent-mark by depositing castoreum and/or anal gland secretion on s... more Beaver (Castor spp.) normally scent-mark by depositing castoreum and/or anal gland secretion on scent mounds close to the water's edge. The aim of this study was to investigate the hypothesis that the Eurasian beaver (C. fiber) scent-marks as a means of territory defense. Scent-marking behavior was studied during an entire year (April 1, 1995–March 31, 1996) in seven adjacent territories
In Norway, Sweden, and Finland most beavers (Castor spp.) harvested are shot with center-fire rif... more In Norway, Sweden, and Finland most beavers (Castor spp.) harvested are shot with center-fire rifles. Shooting entai/s problems not encountered in trapping including pelt damage from bullet hoies (body shots are common) and escape of wounded anima/s. It was predicted that beavers shot in the body with splinter projecti/es designed to fragment after impact would experience fewer exit hoies (i.e.,
The genus Castor comprises two species: the Eurasian beaver Castor fibre , and the North American... more The genus Castor comprises two species: the Eurasian beaver Castor fibre , and the North American beaver Castor canadensis . Both species suffered from overexploitation, but have seen a revival since the 1920s due to increased protection and reintroduction programmes. Increases in the populations and distributions of species that are able to modify ecosystems have generated much scientific interest. Here
Though numerous studies of damage caused by beaver (Castor canadensis and C. fiber) to commercial... more Though numerous studies of damage caused by beaver (Castor canadensis and C. fiber) to commercially managed forests have been conducted, few have incorporated the economic advantages beaver can create for forest owners. In Norway, hunting rights belong to the landowner, who in turn can obtain income from the further sale of hunting privileges to others. In this study we have
In this study, we used restriction site-associated DNA (RAD) sequencing to discover SNP markers s... more In this study, we used restriction site-associated DNA (RAD) sequencing to discover SNP markers suitable for population genetic and parentage analysis with the aim of using them for monitoring the reintroduction of the Eurasian beaver (Castor fibre) to Scotland. In the absence of a reference genome for beaver, we built contigs and discovered SNPs within them using paired-end RAD data, so as to have sufficient flanking region around the SNPs to conduct marker design. To do this, we used a simple pipeline which catalogued the Read 1 data in stacks and then used the assembler cortex_var to conduct de novo assembly and genotyping of multiple samples using the Read 2 data. The analysis of around 1.1 billion short reads of sequence data was reduced to a set of 2579 high-quality candidate SNP markers that were polymorphic in Norwegian and Bavarian beaver. Both laboratory validation of a subset of eight of the SNPs (1.3% error) and internal validation by confirming patterns of Mendelian inheritance in a family group (0.9% error) confirmed the success of this approach.
... enhance their survival (predator avoidance, shelter, thermoregulation), canals to extend feed... more ... enhance their survival (predator avoidance, shelter, thermoregulation), canals to extend feeding areas, food ... sediment volume and accumulation pattern of sediment have a great role in shaping ... Beaver ponds function as sediment traps, and they also accumulate organic matter ...
In 2009 and 2010 16 Norwegian Eurasian beavers (Castor fiber) were reintroduced to Knapdale, Scot... more 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.
... between the number of scent markings and the number of animals in the colony (Butler and Butl... more ... between the number of scent markings and the number of animals in the colony (Butler and Butler, 1979; Svendsen, 1980a; Houlihan ... Acknowledgments—We thank Bram and Dirk Fey tor logistic support; Erik Boereboom, Mieuw van Diedenhoven, and Bart Weel for excellent ...
We tested the hypothesis that a main function of territory marking in European beaver (Castor fib... more We tested the hypothesis that a main function of territory marking in European beaver (Castor fiber) is defence of the territory. The results showed that:1) beaver colonies with close neighbors scent-mark more often than isolated ones; 2) the number of scent markings increased significantly with the number of neighboring territories and individuals, the mean distance to all other territories, duration
Rosell, F. & Sun, L. 1999: Use of anal gland secretion to distinguish the two beaver species Cast... more Rosell, F. & Sun, L. 1999: Use of anal gland secretion to distinguish the two beaver species Castor canadensis and C. fiber. - Wildl. Biol. 5: 119-123. Introduced North American beavers Castor canadensis pose a potential threat to the continuing recovery of Eurasian beaver C. fiber populations in several European countries. For management purposes, it is necessary to be able
Beaver (Castor spp.) normally scent-mark by depositing castoreum and/or anal gland secretion on s... more Beaver (Castor spp.) normally scent-mark by depositing castoreum and/or anal gland secretion on scent mounds close to the water's edge. The aim of this study was to investigate the hypothesis that the Eurasian beaver (C. fiber) scent-marks as a means of territory defense. Scent-marking behavior was studied during an entire year (April 1, 1995–March 31, 1996) in seven adjacent territories
In Norway, Sweden, and Finland most beavers (Castor spp.) harvested are shot with center-fire rif... more In Norway, Sweden, and Finland most beavers (Castor spp.) harvested are shot with center-fire rifles. Shooting entai/s problems not encountered in trapping including pelt damage from bullet hoies (body shots are common) and escape of wounded anima/s. It was predicted that beavers shot in the body with splinter projecti/es designed to fragment after impact would experience fewer exit hoies (i.e.,
The genus Castor comprises two species: the Eurasian beaver Castor fibre , and the North American... more The genus Castor comprises two species: the Eurasian beaver Castor fibre , and the North American beaver Castor canadensis . Both species suffered from overexploitation, but have seen a revival since the 1920s due to increased protection and reintroduction programmes. Increases in the populations and distributions of species that are able to modify ecosystems have generated much scientific interest. Here
Though numerous studies of damage caused by beaver (Castor canadensis and C. fiber) to commercial... more Though numerous studies of damage caused by beaver (Castor canadensis and C. fiber) to commercially managed forests have been conducted, few have incorporated the economic advantages beaver can create for forest owners. In Norway, hunting rights belong to the landowner, who in turn can obtain income from the further sale of hunting privileges to others. In this study we have
In this study, we used restriction site-associated DNA (RAD) sequencing to discover SNP markers s... more In this study, we used restriction site-associated DNA (RAD) sequencing to discover SNP markers suitable for population genetic and parentage analysis with the aim of using them for monitoring the reintroduction of the Eurasian beaver (Castor fibre) to Scotland. In the absence of a reference genome for beaver, we built contigs and discovered SNPs within them using paired-end RAD data, so as to have sufficient flanking region around the SNPs to conduct marker design. To do this, we used a simple pipeline which catalogued the Read 1 data in stacks and then used the assembler cortex_var to conduct de novo assembly and genotyping of multiple samples using the Read 2 data. The analysis of around 1.1 billion short reads of sequence data was reduced to a set of 2579 high-quality candidate SNP markers that were polymorphic in Norwegian and Bavarian beaver. Both laboratory validation of a subset of eight of the SNPs (1.3% error) and internal validation by confirming patterns of Mendelian inheritance in a family group (0.9% error) confirmed the success of this approach.
... enhance their survival (predator avoidance, shelter, thermoregulation), canals to extend feed... more ... enhance their survival (predator avoidance, shelter, thermoregulation), canals to extend feeding areas, food ... sediment volume and accumulation pattern of sediment have a great role in shaping ... Beaver ponds function as sediment traps, and they also accumulate organic matter ...
In 2009 and 2010 16 Norwegian Eurasian beavers (Castor fiber) were reintroduced to Knapdale, Scot... more 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.
... between the number of scent markings and the number of animals in the colony (Butler and Butl... more ... between the number of scent markings and the number of animals in the colony (Butler and Butler, 1979; Svendsen, 1980a; Houlihan ... Acknowledgments—We thank Bram and Dirk Fey tor logistic support; Erik Boereboom, Mieuw van Diedenhoven, and Bart Weel for excellent ...
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Papers by Frank Rosell