K A Hobson
Dados Biográficos
| ID | 153091 |
|---|---|
| NOME | K A Hobson |
| PRENOMES | K A |
| SOBRENOME | Hobson |
| ASSINATURA | HOBSON K A |
| AFILIAÇÕES | Environment and Climate Change Canada |
| ORCID | 0000-0002-2525-1178 |
| VERIFICADO | Sim |
| TOTAL DE OBRAS | 21 |
| TOTAL DE CITAÇÕES | 240 |
| TOTAL COMO AUTOR | 21 |
| TOTAL COMO EDITOR | 0 |
| PRIMEIRO ANO DE PUBLICAÇÃO | 1982 |
| ANO MAIS RECENTE DE PUBLICAÇÃO | 2012 |
| ÍNDICE H | 6 |
Intra‐individual variation in stable carbon (δ 13 C) and nitrogen (δ 15 N) isotopes in mandibles of modern caribou of Qamanirjuaq ( Rangifer tarandus groenlandicus ) and Banks Island ( Rangifer tarand…
Intra‐individual variations in carbon (δ 13 C) and nitrogen (δ 15 N) isotope measurements of dentine collagen in ungulate teeth can be related to diet and environmental changes at different periods during the life of the animal. A protocol of serial sampling of first, second and third molar roots was applied to modern caribou (17–27 months old) of the Qamanirjuaq herd ( Rangifer tarandus groenlandicus ), Canada. Based on a previous study, we pred…
Niche partitioning between two sympatric genetically distinct cave bears (Ursus spelaeus and Ursus ingressus) and brown bear (Ursus arctos) from Austria
Distribution and Diet of Ivory Gulls ( Pagophila eburnea ) in the North Water
Ivory gulls (Pagophila eburnea, Phipps, 1774), one of the world’s least-known species, have declined throughout their range in recent years. This study describes the patterns of ivory gull use of the North Water polynya, a large polynya that occurs every year near ivory gull breeding sites on Ellesmere Island, Nunavut, Canada. We conducted at-sea surveys from Canadian icebreakers during the summers of 1997–99. In 1998, stomach contents of five iv…
Can carbon-13 in large herbivores reflect the canopy effect in temperate and boreal ecosystems? Evidence from modern and ancient ungulates
Global application of stable hydrogen and oxygen isotopes to wildlife forensics
A Comparison of Modern and Preindustrial Levels of Mercury in the Teeth of Beluga in the Mackenzie Delta, Northwest Territories, and Walrus at Igloolik, Nunavut, Canada
Mercury (Hg) concentrations were compared in modern and preindustrial teeth of belugas (Delphinapterus leucas) and walrus (Odobenus rosmarus rosmarus) at sites in the Canadian Arctic so that the relative amounts of natural and anthropogenic Hg in modern animals could be estimated. Mercury levels in the teeth of Beaufort Sea belugas captured in the Mackenzie Delta, Northwest Territories, in 1993 were significantly (p = 0.0001) higher than those in…
Environmental Contaminants in Colonial Waterbirds from Great Slave Lake, NWT
Great Slave Lake in the Northwest Territories, Canada, differs regionally in trophic status and local and regional inputs of contaminants. Spatial and temporal trends in contaminant levels in bioindicator species such as colonial waterbirds could offer insights into the potential for contaminant bioaccumulation in Great Slave Lake. Persistent chlorinated hydrocarbon contaminants, mercury (Hg), and selenium (Se) were examined in herring gull (Laru…
Tracing origins and migration of wildlife using stable isotopes
Stable-Nitrogen Isotope Enrichment in Avian Tissues Due to Fasting and Nutritional Stress
Studies using measurements of δ 15N to delineate diet or trophic level in natural ecosystems are based on the premise that δ 15N values in consumer tissues can be reliably correlated with those in the diet. However, juvenile Japanese Quail (Coturnix japonica) fed a rationed diet designed to maintain, but not increase, body mass showed significantly enriched tissue δ 15N values over a control group fed the same diet ad libitum. We tested the hypot…
Assessing Avian Diets Using Stable Isotopes II
Studies using stable-isotope analysis to infer diet require a knowledge of how stable-isotope ratios in consumer tissues are related to dietary values. We determined δ 13C and δ 15N diet-tissue fractionation factors for blood, liver, muscle, bone collagen and feathers of domestic chickens (Gallus gallus), Japanese Quail (Coturnix japonica) and Ring-billed Gulls (Larus delawarensis) and for blood and feather samples of adult Peregrine Falcons (Fal…
Observations of Foraging Northern Fulmars ( Fulmarus Glacialis ) in the Canadian High Arctic
We summarize observations of foraging northern fulmars (Fulmarus glacialis) in the Barrow Strait-Lancaster Sound region of the Northwest Territories from June to September 1984-90 and in Admiralty Inlet, N.W.T., in July 1989. In each year, fulmars scavenged hunter-killed marine mammal remains in the vicinity of Resolute Bay. Large feeding flocks, aggregated primarily along tide lines and at upwelling sites, exploited primarily calanoid copepods b…
A 10 500-Year Sequence of Bird Remains from the Southern Boreal Forest Region of Western Canada
The prehistoric avian fauna from the Charlie Lake Cave site, Peace River District, British Columbia, spans the last 10,500 years and includes birds from eleven orders. Prior to about 10,000 B.P. the fauna is sparse and the most common species is Cliff Swallow (Hirundo pyrrhonota), which probably nested at the site. The avian fauna from 10,000 B.P. to the present is dominated by wetland associated birds (mainly grebes and ducks) of the same specie…
The Importance of Marine Protein in the Diet of Coastal Australian Aborigines
The variation in δ13C values in bone collagen for two wild herbivore populations
Isotope Assessment and the Seasonal-Mobility Hypothesis in the Southwestern Cape of South Africa [and Comments and Replies]
This paper consists of a stable carbon isotopic assessment of the diets of the Holocene human inhabitants of the southwestern Cape, South Africa. Samples of the foods these people ate were collected from each of the four major physiographic zones in the area and their 13C/12C rations measured. A total of more than 200 such analyses enabled the estimation of the average 13C values of prehistoric human diets in each zone. This information is used t…
On Australian Aboriginal Diets
Simon Fraser University Radiocarbon Dates III
This list reports measurements made on archaeologic and geologic samples by our laboratory from June 1982 to December 1983. Results of measurements made during that period which lack review by submitters will be reported in a subsequent date list. Sample preparation techniques and benzene synthesis remain as described previously (R, 1982, v 24, p 344–351). For low organic samples, such as sediments, we now use a combustion tube assembly. These sa…
Marine and Terrestrial Protein in Australian Aboriginal Diets
Carbon isotope measurement techniques for bone collagen
Simon Fraser University Radiocarbon Dates II
This list reports measurements made on archaeologic samples by our laboratory from September 1980 to May 1982. Results of measurements made during that period which lack review by submitters will be reported in a subsequent date list. Dates were obtained by liquid scintillation counting of benzene using the laboratory procedure outlined previously (R, 1982, v 24, p 344–351). All dates are expressed in 14 C years relative to ad 1950 based on the L…
Simon Fraser University Radiocarbon Dates I
The SFU Archaeology Department has constructed a small radiocarbon dating facility to serve its own needs and, to the extent that time is available, the needs of other archaeologists and earth scientists. All dates reported here were processed by our laboratory from October 1979 to September 1980. The 14 C measurements are made using conventional techniques for liquid scintillation counting of benzene. The samples are burned in a Phonon Mark IV c…
Isotope Assessment and the Seasonal-Mobility Hypothesis in the Southwestern Cape of South Africa [and Comments and Replies]
This paper consists of a stable carbon isotopic assessment of the diets of the Holocene human inhabitants of the southwestern Cape, South Africa. Samples of the foods these people ate were collected from each of the four major physiographic zones in the area and their 13C/12C rations measured. A total of more than 200 such analyses enabled the estimation of the average 13C values of prehistoric human diets in each zone. This information is used t…
Carbon isotope measurement techniques for bone collagen
Marine and Terrestrial Protein in Australian Aboriginal Diets
The Importance of Marine Protein in the Diet of Coastal Australian Aborigines
The variation in δ13C values in bone collagen for two wild herbivore populations
Intra‐individual variation in stable carbon (δ 13 C) and nitrogen (δ 15 N) isotopes in mandibles of modern caribou of Qamanirjuaq ( Rangifer tarandus groenlandicus ) and Banks Island ( Rangifer tarand…
Intra‐individual variations in carbon (δ 13 C) and nitrogen (δ 15 N) isotope measurements of dentine collagen in ungulate teeth can be related to diet and environmental changes at different periods during the life of the animal. A protocol of serial sampling of first, second and third molar roots was applied to modern caribou (17–27 months old) of the Qamanirjuaq herd ( Rangifer tarandus groenlandicus ), Canada. Based on a previous study, we pred…
On Australian Aboriginal Diets
Simon Fraser University Radiocarbon Dates I
The SFU Archaeology Department has constructed a small radiocarbon dating facility to serve its own needs and, to the extent that time is available, the needs of other archaeologists and earth scientists. All dates reported here were processed by our laboratory from October 1979 to September 1980. The 14 C measurements are made using conventional techniques for liquid scintillation counting of benzene. The samples are burned in a Phonon Mark IV c…
Simon Fraser University Radiocarbon Dates II
This list reports measurements made on archaeologic samples by our laboratory from September 1980 to May 1982. Results of measurements made during that period which lack review by submitters will be reported in a subsequent date list. Dates were obtained by liquid scintillation counting of benzene using the laboratory procedure outlined previously (R, 1982, v 24, p 344–351). All dates are expressed in 14 C years relative to ad 1950 based on the L…
Simon Fraser University Radiocarbon Dates I
The SFU Archaeology Department has constructed a small radiocarbon dating facility to serve its own needs and, to the extent that time is available, the needs of other archaeologists and earth scientists. All dates reported here were processed by our laboratory from October 1979 to September 1980. The 14 C measurements are made using conventional techniques for liquid scintillation counting of benzene. The samples are burned in a Phonon Mark IV c…
Carbon isotope measurement techniques for bone collagen
Simon Fraser University Radiocarbon Dates II
This list reports measurements made on archaeologic samples by our laboratory from September 1980 to May 1982. Results of measurements made during that period which lack review by submitters will be reported in a subsequent date list. Dates were obtained by liquid scintillation counting of benzene using the laboratory procedure outlined previously (R, 1982, v 24, p 344–351). All dates are expressed in 14 C years relative to ad 1950 based on the L…
Simon Fraser University Radiocarbon Dates III
This list reports measurements made on archaeologic and geologic samples by our laboratory from June 1982 to December 1983. Results of measurements made during that period which lack review by submitters will be reported in a subsequent date list. Sample preparation techniques and benzene synthesis remain as described previously (R, 1982, v 24, p 344–351). For low organic samples, such as sediments, we now use a combustion tube assembly. These sa…
Marine and Terrestrial Protein in Australian Aboriginal Diets
The variation in δ13C values in bone collagen for two wild herbivore populations
Isotope Assessment and the Seasonal-Mobility Hypothesis in the Southwestern Cape of South Africa [and Comments and Replies]
This paper consists of a stable carbon isotopic assessment of the diets of the Holocene human inhabitants of the southwestern Cape, South Africa. Samples of the foods these people ate were collected from each of the four major physiographic zones in the area and their 13C/12C rations measured. A total of more than 200 such analyses enabled the estimation of the average 13C values of prehistoric human diets in each zone. This information is used t…
On Australian Aboriginal Diets
The Importance of Marine Protein in the Diet of Coastal Australian Aborigines
Assessing Avian Diets Using Stable Isotopes II
Studies using stable-isotope analysis to infer diet require a knowledge of how stable-isotope ratios in consumer tissues are related to dietary values. We determined δ 13C and δ 15N diet-tissue fractionation factors for blood, liver, muscle, bone collagen and feathers of domestic chickens (Gallus gallus), Japanese Quail (Coturnix japonica) and Ring-billed Gulls (Larus delawarensis) and for blood and feather samples of adult Peregrine Falcons (Fal…
Observations of Foraging Northern Fulmars ( Fulmarus Glacialis ) in the Canadian High Arctic
We summarize observations of foraging northern fulmars (Fulmarus glacialis) in the Barrow Strait-Lancaster Sound region of the Northwest Territories from June to September 1984-90 and in Admiralty Inlet, N.W.T., in July 1989. In each year, fulmars scavenged hunter-killed marine mammal remains in the vicinity of Resolute Bay. Large feeding flocks, aggregated primarily along tide lines and at upwelling sites, exploited primarily calanoid copepods b…
A 10 500-Year Sequence of Bird Remains from the Southern Boreal Forest Region of Western Canada
The prehistoric avian fauna from the Charlie Lake Cave site, Peace River District, British Columbia, spans the last 10,500 years and includes birds from eleven orders. Prior to about 10,000 B.P. the fauna is sparse and the most common species is Cliff Swallow (Hirundo pyrrhonota), which probably nested at the site. The avian fauna from 10,000 B.P. to the present is dominated by wetland associated birds (mainly grebes and ducks) of the same specie…
Stable-Nitrogen Isotope Enrichment in Avian Tissues Due to Fasting and Nutritional Stress
Studies using measurements of δ 15N to delineate diet or trophic level in natural ecosystems are based on the premise that δ 15N values in consumer tissues can be reliably correlated with those in the diet. However, juvenile Japanese Quail (Coturnix japonica) fed a rationed diet designed to maintain, but not increase, body mass showed significantly enriched tissue δ 15N values over a control group fed the same diet ad libitum. We tested the hypot…
Tracing origins and migration of wildlife using stable isotopes
Environmental Contaminants in Colonial Waterbirds from Great Slave Lake, NWT
Great Slave Lake in the Northwest Territories, Canada, differs regionally in trophic status and local and regional inputs of contaminants. Spatial and temporal trends in contaminant levels in bioindicator species such as colonial waterbirds could offer insights into the potential for contaminant bioaccumulation in Great Slave Lake. Persistent chlorinated hydrocarbon contaminants, mercury (Hg), and selenium (Se) were examined in herring gull (Laru…
A Comparison of Modern and Preindustrial Levels of Mercury in the Teeth of Beluga in the Mackenzie Delta, Northwest Territories, and Walrus at Igloolik, Nunavut, Canada
Mercury (Hg) concentrations were compared in modern and preindustrial teeth of belugas (Delphinapterus leucas) and walrus (Odobenus rosmarus rosmarus) at sites in the Canadian Arctic so that the relative amounts of natural and anthropogenic Hg in modern animals could be estimated. Mercury levels in the teeth of Beaufort Sea belugas captured in the Mackenzie Delta, Northwest Territories, in 1993 were significantly (p = 0.0001) higher than those in…
Global application of stable hydrogen and oxygen isotopes to wildlife forensics
Can carbon-13 in large herbivores reflect the canopy effect in temperate and boreal ecosystems? Evidence from modern and ancient ungulates
Distribution and Diet of Ivory Gulls ( Pagophila eburnea ) in the North Water
Ivory gulls (Pagophila eburnea, Phipps, 1774), one of the world’s least-known species, have declined throughout their range in recent years. This study describes the patterns of ivory gull use of the North Water polynya, a large polynya that occurs every year near ivory gull breeding sites on Ellesmere Island, Nunavut, Canada. We conducted at-sea surveys from Canadian icebreakers during the summers of 1997–99. In 1998, stomach contents of five iv…
Niche partitioning between two sympatric genetically distinct cave bears (Ursus spelaeus and Ursus ingressus) and brown bear (Ursus arctos) from Austria
Intra‐individual variation in stable carbon (δ 13 C) and nitrogen (δ 15 N) isotopes in mandibles of modern caribou of Qamanirjuaq ( Rangifer tarandus groenlandicus ) and Banks Island ( Rangifer tarand…
Intra‐individual variations in carbon (δ 13 C) and nitrogen (δ 15 N) isotope measurements of dentine collagen in ungulate teeth can be related to diet and environmental changes at different periods during the life of the animal. A protocol of serial sampling of first, second and third molar roots was applied to modern caribou (17–27 months old) of the Qamanirjuaq herd ( Rangifer tarandus groenlandicus ), Canada. Based on a previous study, we pred…
Biology (14 obras) · Isotope Analysis in Ecology (12 obras) · Archaeology and ancient environmental studies (10 obras) · Ecology (10 obras) · Geography (10 obras) · Ecology (8 obras) · Pacific and Southeast Asian Studies (8 obras) · Pleistocene-Era Hominins and Archaeology (8 obras) · Archaeology (7 obras) · Geology (7 obras)