The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Russel D. Andrews - One of the best experts on this subject based on the ideXlab platform.
-
differentiating between steller sea lion Eumetopias jubatus and northern fur seal callorhinus ursinus scats through analysis of faecal dna
Molecular Ecology Resources, 2011Co-Authors: Russel D. Andrews, Jason N Waite, Mary Bozza, Lisette P WaitsAbstract:: We describe a method to determine the species of pinniped from faeces collected from sympatric Steller sea lion (Eumetopias jubatus) and northern fur seal (Callorhinus ursinus) rookeries using newly developed species-specific primers that amplify a 667-669-base pair segment from the mitochondrial DNA (mtDNA) cytochrome B (cytB) gene region. The primers yielded the correct species in 100% of tissue samples from 10 known animals and 100% of faecal samples from 13 known animals. Species could be identified unequivocally for 87.7% of faecal samples from 122 unknown individuals. The ability to differentiate between scats of sympatrically breeding Steller sea lions and northern fur seals will contribute to the range-wide knowledge of the foraging strategies of both species as well as allow researchers to examine the niche partitioning and potential resource competition between the two predators.
-
differentiating between steller sea lion Eumetopias jubatus and northern fur seal callorhinus ursinus scats through analysis of faecal dna
Molecular Ecology Resources, 2011Co-Authors: Russel D. Andrews, Jason N Waite, Mary Bozza, Lisette P WaitsAbstract:: We describe a method to determine the species of pinniped from faeces collected from sympatric Steller sea lion (Eumetopias jubatus) and northern fur seal (Callorhinus ursinus) rookeries using newly developed species-specific primers that amplify a 667-669-base pair segment from the mitochondrial DNA (mtDNA) cytochrome B (cytB) gene region. The primers yielded the correct species in 100% of tissue samples from 10 known animals and 100% of faecal samples from 13 known animals. Species could be identified unequivocally for 87.7% of faecal samples from 122 unknown individuals. The ability to differentiate between scats of sympatrically breeding Steller sea lions and northern fur seals will contribute to the range-wide knowledge of the foraging strategies of both species as well as allow researchers to examine the niche partitioning and potential resource competition between the two predators.
-
predicting metabolic rate from heart rate in juvenile steller sea lions Eumetopias jubatus
The Journal of Experimental Biology, 2003Co-Authors: Jan M. Mcphee, David A S Rosen, Russel D. AndrewsAbstract:SUMMARY The validity of using heart rate to estimate energy expenditure in free-ranging Steller sea lions Eumetopias jubatus was investigated by establishing whether there is a relationship between heart rate (fH) and oxygen consumption rate (VO2) in captive sea lions while swimming and resting. Four trained Steller sea lions (2 males and 2 females; mass 87.4–194.4 kg; age 16 months–3 years) were each equipped with a datalogger and two dorsal subcutaneous electrodes to record electrocardiograms from which fH was calculated. VO2 (measured using open-circuit respirometry) was simultaneously recorded while the previously fasted animals were at rest within an enclosed dry metabolic chamber or while they swam in an enclosed swim mill against water currents of various speeds (0–1.5 m s–1). The mean regression equation describing the relationship between fH (beats min–1) and VO2 (ml h–1 kg–0.60) for all four animals was VO2 =(71.3fH±4.3)–(1138.5±369.6) (means± S.E.M.) (r2=0.69, P<0.01). The relationship demonstrated between fH and VO2 while fasting suggests that heart rate can potentially be used to monitor energy consumption in free-ranging Steller sea lions. However, a short-term feeding experiment revealed no significant increase in heart rate following a 6 kg or 12 kg meal to match the observed increase in rate of oxygen consumption. This suggests that heart rate may not accurately reflect energy consumption during digestion events. Additional research should be conducted to further elucidate how the relationship between heart rate and oxygen consumption is affected by such factors as digestive state, stress and age.
Jason N Waite - One of the best experts on this subject based on the ideXlab platform.
-
Environmental and biological factors influencing maternal attendance patterns of Steller sea lions (Eumetopias jubatus) in Russia
Journal of Mammalogy, 2011Co-Authors: Vladimir Burkanov, Jason N Waite, Eliezer Gurarie, Alexey Altukhov, Evgeny G. Mamaev, P. A. Permyakov, Alexey M. Trukhin, Tom GelattAbstract:Abstract Maternal attendance patterns in free-ranging wildlife can provide insight into basic biology, foraging behavior, and population dynamics. We collected detailed visual observations of attendance patterns by adult lactating Steller sea lions (Eumetopias jubatus) from 2005 to 2007 on 6 major rookeries in the Russian Far East, including those with an increasing population trend (Sea of Okhotsk), severely depleted populations that were recovering (Kuril Islands), or those that were stable (Commander Islands). Individually identifiable females were observed during the postpartum period, with special attention paid to presence and absence during the day and to departure and arrival times. Within Russia females on several Kuril Islands rookeries exhibited extremely short foraging trip durations (median 6.5–8.0 h) and spent higher proportions of time on the rookery (75–82%), whereas females in the Sea of Okhotsk population had the longest trips (median 19.8 h) and spent the least amount of time on the roo...
-
differentiating between steller sea lion Eumetopias jubatus and northern fur seal callorhinus ursinus scats through analysis of faecal dna
Molecular Ecology Resources, 2011Co-Authors: Russel D. Andrews, Jason N Waite, Mary Bozza, Lisette P WaitsAbstract:: We describe a method to determine the species of pinniped from faeces collected from sympatric Steller sea lion (Eumetopias jubatus) and northern fur seal (Callorhinus ursinus) rookeries using newly developed species-specific primers that amplify a 667-669-base pair segment from the mitochondrial DNA (mtDNA) cytochrome B (cytB) gene region. The primers yielded the correct species in 100% of tissue samples from 10 known animals and 100% of faecal samples from 13 known animals. Species could be identified unequivocally for 87.7% of faecal samples from 122 unknown individuals. The ability to differentiate between scats of sympatrically breeding Steller sea lions and northern fur seals will contribute to the range-wide knowledge of the foraging strategies of both species as well as allow researchers to examine the niche partitioning and potential resource competition between the two predators.
-
differentiating between steller sea lion Eumetopias jubatus and northern fur seal callorhinus ursinus scats through analysis of faecal dna
Molecular Ecology Resources, 2011Co-Authors: Russel D. Andrews, Jason N Waite, Mary Bozza, Lisette P WaitsAbstract:: We describe a method to determine the species of pinniped from faeces collected from sympatric Steller sea lion (Eumetopias jubatus) and northern fur seal (Callorhinus ursinus) rookeries using newly developed species-specific primers that amplify a 667-669-base pair segment from the mitochondrial DNA (mtDNA) cytochrome B (cytB) gene region. The primers yielded the correct species in 100% of tissue samples from 10 known animals and 100% of faecal samples from 13 known animals. Species could be identified unequivocally for 87.7% of faecal samples from 122 unknown individuals. The ability to differentiate between scats of sympatrically breeding Steller sea lions and northern fur seals will contribute to the range-wide knowledge of the foraging strategies of both species as well as allow researchers to examine the niche partitioning and potential resource competition between the two predators.
-
Three-dimensional photogrammetry as a tool for estimating morphometrics and body mass of Steller sea lions (Eumetopias jubatus)
Canadian Journal of Fisheries and Aquatic Sciences, 2007Co-Authors: Jason N Waite, Jo-ann E. Mellish, Wendy J. Schrader, Markus HorningAbstract:A technique was developed to estimate morphometrics and body mass of Steller sea lions (Eumetopias jubatus) using three-dimensional (3D) photogrammetry. 3D photogrammetry reduces many of the problems associated with camera and body position encountered with two-dimensional photogrammetric techniques, allowing body mass estimation of free-ranging, active sea lions, without sedation, heavy weighing equipment, and disturbance. 3D computer wireframes of 53 Steller sea lions of various age classes were generated from multiple time-synchronous digital photos and used to estimate length, girth, and volume. Average estimates of standard length and axillary girth were within ±2.5% and ±4.0% of physically measured dimensions, respectively. Average estimates of standard length and axillary girth using only wireframes based on ideal body postures were within ±1.7% and ±3.1% of physically measured di- mensions, respectively. Regressions of physically measured mass on photogrammetrically estimated body volume yielded a predictive model. Body mass estimates using this model were on average within 9.0% (95% confidence interval = ±1.7%) of the physically measured mass. This technique was also successfully applied to reptiles and fish. Resume : Nous avons mis au point une technique pour estimer les donnees morphometriques et la masse corporelle chez des lions de mer de Steller (Eumetopias jubatus) a l'aide de la photogrammetrie tridimensionnelle (3D). La
E T Lyons - One of the best experts on this subject based on the ideXlab platform.
-
historic importance of some aspects of research by o wilford olsen on hookworms uncinaria lucasi in northern fur seals callorhinus ursinus and steller sea lions eumatopias jubatus in 1951 on st paul island alaska
Parasitology Research, 2005Co-Authors: E T LyonsAbstract:The purpose of this paper is to disseminate, more widely, certain historically important aspects of research by O. Wilford Olsen on hookworms (Uncinaria lucasi) in northern fur seals (Callorhinus ursinus) and Steller sea lions (Eumatopias jubatus) in 1951 on St. Paul Island, Alaska. Highly meaningful facets of the research were recorded only in a report with limited availability by Olsen in 1952. Portions of his research presented here include measurements of hookworm free-living infective third-stage larvae (L3) and adults, photographs of bursae, and the conclusion that the species of hookworms (U. lucasi) is probably the same in both pinniped hosts. This information is especially important because very little has been published on taxonomy of hookworms in E. jubatus.
-
historic importance of some aspects of research by o wilford olsen on hookworms uncinaria lucasi in northern fur seals callorhinus ursinus and steller sea lions eumatopias jubatus in 1951 on st paul island alaska
Parasitology Research, 2005Co-Authors: E T LyonsAbstract:The purpose of this paper is to disseminate, more widely, certain historically important aspects of research by O. Wilford Olsen on hookworms (Uncinaria lucasi) in northern fur seals (Callorhinus ursinus) and Steller sea lions (Eumatopias jubatus) in 1951 on St. Paul Island, Alaska. Highly meaningful facets of the research were recorded only in a report with limited availability by Olsen in 1952. Portions of his research presented here include measurements of hookworm free-living infective third-stage larvae (L3) and adults, photographs of bursae, and the conclusion that the species of hookworms (U. lucasi) is probably the same in both pinniped hosts. This information is especially important because very little has been published on taxonomy of hookworms in E. jubatus.
Mary Bozza - One of the best experts on this subject based on the ideXlab platform.
-
differentiating between steller sea lion Eumetopias jubatus and northern fur seal callorhinus ursinus scats through analysis of faecal dna
Molecular Ecology Resources, 2011Co-Authors: Russel D. Andrews, Jason N Waite, Mary Bozza, Lisette P WaitsAbstract:: We describe a method to determine the species of pinniped from faeces collected from sympatric Steller sea lion (Eumetopias jubatus) and northern fur seal (Callorhinus ursinus) rookeries using newly developed species-specific primers that amplify a 667-669-base pair segment from the mitochondrial DNA (mtDNA) cytochrome B (cytB) gene region. The primers yielded the correct species in 100% of tissue samples from 10 known animals and 100% of faecal samples from 13 known animals. Species could be identified unequivocally for 87.7% of faecal samples from 122 unknown individuals. The ability to differentiate between scats of sympatrically breeding Steller sea lions and northern fur seals will contribute to the range-wide knowledge of the foraging strategies of both species as well as allow researchers to examine the niche partitioning and potential resource competition between the two predators.
-
differentiating between steller sea lion Eumetopias jubatus and northern fur seal callorhinus ursinus scats through analysis of faecal dna
Molecular Ecology Resources, 2011Co-Authors: Russel D. Andrews, Jason N Waite, Mary Bozza, Lisette P WaitsAbstract:: We describe a method to determine the species of pinniped from faeces collected from sympatric Steller sea lion (Eumetopias jubatus) and northern fur seal (Callorhinus ursinus) rookeries using newly developed species-specific primers that amplify a 667-669-base pair segment from the mitochondrial DNA (mtDNA) cytochrome B (cytB) gene region. The primers yielded the correct species in 100% of tissue samples from 10 known animals and 100% of faecal samples from 13 known animals. Species could be identified unequivocally for 87.7% of faecal samples from 122 unknown individuals. The ability to differentiate between scats of sympatrically breeding Steller sea lions and northern fur seals will contribute to the range-wide knowledge of the foraging strategies of both species as well as allow researchers to examine the niche partitioning and potential resource competition between the two predators.
Lisette P Waits - One of the best experts on this subject based on the ideXlab platform.
-
differentiating between steller sea lion Eumetopias jubatus and northern fur seal callorhinus ursinus scats through analysis of faecal dna
Molecular Ecology Resources, 2011Co-Authors: Russel D. Andrews, Jason N Waite, Mary Bozza, Lisette P WaitsAbstract:: We describe a method to determine the species of pinniped from faeces collected from sympatric Steller sea lion (Eumetopias jubatus) and northern fur seal (Callorhinus ursinus) rookeries using newly developed species-specific primers that amplify a 667-669-base pair segment from the mitochondrial DNA (mtDNA) cytochrome B (cytB) gene region. The primers yielded the correct species in 100% of tissue samples from 10 known animals and 100% of faecal samples from 13 known animals. Species could be identified unequivocally for 87.7% of faecal samples from 122 unknown individuals. The ability to differentiate between scats of sympatrically breeding Steller sea lions and northern fur seals will contribute to the range-wide knowledge of the foraging strategies of both species as well as allow researchers to examine the niche partitioning and potential resource competition between the two predators.
-
differentiating between steller sea lion Eumetopias jubatus and northern fur seal callorhinus ursinus scats through analysis of faecal dna
Molecular Ecology Resources, 2011Co-Authors: Russel D. Andrews, Jason N Waite, Mary Bozza, Lisette P WaitsAbstract:: We describe a method to determine the species of pinniped from faeces collected from sympatric Steller sea lion (Eumetopias jubatus) and northern fur seal (Callorhinus ursinus) rookeries using newly developed species-specific primers that amplify a 667-669-base pair segment from the mitochondrial DNA (mtDNA) cytochrome B (cytB) gene region. The primers yielded the correct species in 100% of tissue samples from 10 known animals and 100% of faecal samples from 13 known animals. Species could be identified unequivocally for 87.7% of faecal samples from 122 unknown individuals. The ability to differentiate between scats of sympatrically breeding Steller sea lions and northern fur seals will contribute to the range-wide knowledge of the foraging strategies of both species as well as allow researchers to examine the niche partitioning and potential resource competition between the two predators.
