Paul L Koch
Biographic Data
| ID | 3779429 |
|---|---|
| NAME | Paul L Koch |
| GIVEN NAMES | Paul L |
| FAMILY NAME | Koch |
| SIGNATURE | KOCH P L |
| AFFILIATIONS | University of California, Santa Cruz |
| ORCID | 0000-0001-5248-1529 |
| VERIFIED | Yes |
| TOTAL WORKS | 14 |
| TOTAL CITATIONS | 380 |
| AUTHOR COUNT | 14 |
| EDITOR COUNT | 0 |
| FIRST PUBLICATION YEAR | 1996 |
| LATEST PUBLICATION YEAR | 2018 |
| H-INDEX | 4 |
Coyote ( Canis latrans ) use of marine resources in coastal California: A new behavior relative to their recent ancestors
Coyotes ( Canis latrans) are known to consume marine foods, but the importance and persistence of marine subsidies to coyotes is unknown. Recent access to a marine subsidy, especially if gained following apex predator loss, may facilitate coyote expansion along coastal routes and amplify the effects of mesopredator release. Our goal was to quantify and contextualize past and present marine resource use by coyotes on the central coast of Californi…
Global patterns in leaf 13 C discrimination and implications for studies of past and future climate
Fractionation of carbon isotopes by plants during CO 2 uptake and fixation (Δ leaf ) varies with environmental conditions, but quantitative patterns of Δ leaf across environmental gradients at the global scale are lacking. This impedes interpretation of variability in ancient terrestrial organic matter, which encodes climatic and ecological signals. To address this problem, we converted 3,310 published leaf δ 13 C values into mean Δ leaf values f…
Revisiting old bones: Coupled carbon isotope analysis of bioapatite and collagen as an ecological and palaeoecological tool
Isotopic studies of palaeoecological and ecological questions often use bone collagen or bioapatite as substrates, but rarely both. Substantial new information can be gained from the incorporation of isotopic values from both the organic and inorganic fractions of bone. Here we show that combining isotopic data from both substrates provides valuable and unique insights into (1) trophic relationships and dietary interactions; (2) differences in di…
Reconstructing the migration patterns of late Pleistocene mammals from northern Florida, USA
We used analyses of the strontium isotope ( 87 Sr/ 86 Sr) ratios of tooth enamel to reconstruct the migration patterns of fossil mammals collected along the Aucilla River in northern Florida. Specimens date to the late-glacial period and before the last glacial maximum (pre-LGM). Deer and tapir displayed low 87 Sr/ 86 Sr ratios that were similar to the ratios of Florida environments, which suggest that these taxa did not migrate long distance out…
Historical Ecology and Biogeography of North Pacific Pinnipeds: Isotopes and Ancient DNA from Three Archaeological Assemblages
Zooarchaeology has the potential to make significant contributions to knowledge of pinniped biogeography of import to both archaeologists and environmental scientists. We analyzed northern fur seal remains found in three archaeological sites located along the outer coast of the Northeast Pacific Ocean: Cape Addington Rockshelter in southeast Alaska, Ts’ishaa on the west coast of Vancouver Island, and the Netarts Sandspit site on the Oregon Coast.…
Assessing the Causes of Late Pleistocene Extinctions on the Continents
One of the great debates about extinction is whether humans or climatic change caused the demise of the Pleistocene megafauna. Evidence from paleontology, climatology, archaeology, and ecology now supports the idea that humans contributed to extinction on some continents, but human hunting was not solely responsible for the pattern of extinction everywhere. Instead, evidence suggests that the intersection of human impacts with pronounced climatic…
Dietary reconstruction of an early to middle Holocene human population from the central California coast: Insights from advanced stable isotope mixing models
Are calcium isotopes a reliable monitor of trophic level in marine settings
Recent research has shown that calcium isotopes are fractionated by metabolic processes, leading to a decrease in 44Ca/40Ca ratio with increasing trophic level. If so, calcium isotopes could provide information on trophic relationships within foodwebs millions of years older than what we have been able to study thus far with alternative methods (i.e., nitrogen isotopes (δ15N), Sr/Ca). To explore whether δ44Ca values provided marine trophic level …
Assessing the preservation of biogenic strontium in fossil bones and tooth enamel
Analyses of the strontium isotope ratio (87Sr/86Sr) of vertebrate fossils can provide information about palaeobiological attributes such as habitat use and movement patterns. Diagenetic contaminants can alter the 87Sr/86Sr ratio of fossils, however, complicating palaeobiological interpretations. Several pretreatment protocols have been developed to separate diagenetic contaminants from biogenic Sr. While these methods can remove some diagenetic S…
Incorporating concentration dependence in stable isotope mixing models
Isotopic tracking of prehistoric pinniped foraging and distribution along the central California coast: Preliminary Results
Zooarchaeological data from Monterey Bay and the adjacent central California coast corroborate earlier observations from northern California and Oregon that Callorhinus ursinus (northern fur seal) was a much more common component in prehistoric marine mammal prey than its present pelagic distribution and foraging habits would predict. C. ursinus remains from mid-Holocene Monterey Bay occurrences are predominantly from female individuals, associat…
Isotopic Reconstruction of Past Continental Environments
Vertebrate fossils and continental sediments provide a rich record of variations in the isotopic composition of surface environments. To interpret these records, a greater understanding of isotopic sources, as well as fractionations associated with animal physiology, soil geochemistry, and diagenesis, has been essential. Tooth enamel and fish otoliths yield subannual records of surface environments, whereas soil minerals may integrate signals ove…
The Effects of Sample Treatment and Diagenesis on the Isotopic Integrity of Carbonate in Biogenic Hydroxylapatite
Oxygen isotope partitioning between phosphate and carbonate in mammalian apatite
The Effects of Sample Treatment and Diagenesis on the Isotopic Integrity of Carbonate in Biogenic Hydroxylapatite
Assessing the preservation of biogenic strontium in fossil bones and tooth enamel
Analyses of the strontium isotope ratio (87Sr/86Sr) of vertebrate fossils can provide information about palaeobiological attributes such as habitat use and movement patterns. Diagenetic contaminants can alter the 87Sr/86Sr ratio of fossils, however, complicating palaeobiological interpretations. Several pretreatment protocols have been developed to separate diagenetic contaminants from biogenic Sr. While these methods can remove some diagenetic S…
Dietary reconstruction of an early to middle Holocene human population from the central California coast: Insights from advanced stable isotope mixing models
Historical Ecology and Biogeography of North Pacific Pinnipeds: Isotopes and Ancient DNA from Three Archaeological Assemblages
Zooarchaeology has the potential to make significant contributions to knowledge of pinniped biogeography of import to both archaeologists and environmental scientists. We analyzed northern fur seal remains found in three archaeological sites located along the outer coast of the Northeast Pacific Ocean: Cape Addington Rockshelter in southeast Alaska, Ts’ishaa on the west coast of Vancouver Island, and the Netarts Sandspit site on the Oregon Coast.…
Are calcium isotopes a reliable monitor of trophic level in marine settings
Recent research has shown that calcium isotopes are fractionated by metabolic processes, leading to a decrease in 44Ca/40Ca ratio with increasing trophic level. If so, calcium isotopes could provide information on trophic relationships within foodwebs millions of years older than what we have been able to study thus far with alternative methods (i.e., nitrogen isotopes (δ15N), Sr/Ca). To explore whether δ44Ca values provided marine trophic level …
Isotopic tracking of prehistoric pinniped foraging and distribution along the central California coast: Preliminary Results
Zooarchaeological data from Monterey Bay and the adjacent central California coast corroborate earlier observations from northern California and Oregon that Callorhinus ursinus (northern fur seal) was a much more common component in prehistoric marine mammal prey than its present pelagic distribution and foraging habits would predict. C. ursinus remains from mid-Holocene Monterey Bay occurrences are predominantly from female individuals, associat…
Coyote ( Canis latrans ) use of marine resources in coastal California: A new behavior relative to their recent ancestors
Coyotes ( Canis latrans) are known to consume marine foods, but the importance and persistence of marine subsidies to coyotes is unknown. Recent access to a marine subsidy, especially if gained following apex predator loss, may facilitate coyote expansion along coastal routes and amplify the effects of mesopredator release. Our goal was to quantify and contextualize past and present marine resource use by coyotes on the central coast of Californi…
Oxygen isotope partitioning between phosphate and carbonate in mammalian apatite
The Effects of Sample Treatment and Diagenesis on the Isotopic Integrity of Carbonate in Biogenic Hydroxylapatite
Isotopic Reconstruction of Past Continental Environments
Vertebrate fossils and continental sediments provide a rich record of variations in the isotopic composition of surface environments. To interpret these records, a greater understanding of isotopic sources, as well as fractionations associated with animal physiology, soil geochemistry, and diagenesis, has been essential. Tooth enamel and fish otoliths yield subannual records of surface environments, whereas soil minerals may integrate signals ove…
Incorporating concentration dependence in stable isotope mixing models
Isotopic tracking of prehistoric pinniped foraging and distribution along the central California coast: Preliminary Results
Zooarchaeological data from Monterey Bay and the adjacent central California coast corroborate earlier observations from northern California and Oregon that Callorhinus ursinus (northern fur seal) was a much more common component in prehistoric marine mammal prey than its present pelagic distribution and foraging habits would predict. C. ursinus remains from mid-Holocene Monterey Bay occurrences are predominantly from female individuals, associat…
Are calcium isotopes a reliable monitor of trophic level in marine settings
Recent research has shown that calcium isotopes are fractionated by metabolic processes, leading to a decrease in 44Ca/40Ca ratio with increasing trophic level. If so, calcium isotopes could provide information on trophic relationships within foodwebs millions of years older than what we have been able to study thus far with alternative methods (i.e., nitrogen isotopes (δ15N), Sr/Ca). To explore whether δ44Ca values provided marine trophic level …
Assessing the preservation of biogenic strontium in fossil bones and tooth enamel
Analyses of the strontium isotope ratio (87Sr/86Sr) of vertebrate fossils can provide information about palaeobiological attributes such as habitat use and movement patterns. Diagenetic contaminants can alter the 87Sr/86Sr ratio of fossils, however, complicating palaeobiological interpretations. Several pretreatment protocols have been developed to separate diagenetic contaminants from biogenic Sr. While these methods can remove some diagenetic S…
Assessing the Causes of Late Pleistocene Extinctions on the Continents
One of the great debates about extinction is whether humans or climatic change caused the demise of the Pleistocene megafauna. Evidence from paleontology, climatology, archaeology, and ecology now supports the idea that humans contributed to extinction on some continents, but human hunting was not solely responsible for the pattern of extinction everywhere. Instead, evidence suggests that the intersection of human impacts with pronounced climatic…
Dietary reconstruction of an early to middle Holocene human population from the central California coast: Insights from advanced stable isotope mixing models
Historical Ecology and Biogeography of North Pacific Pinnipeds: Isotopes and Ancient DNA from Three Archaeological Assemblages
Zooarchaeology has the potential to make significant contributions to knowledge of pinniped biogeography of import to both archaeologists and environmental scientists. We analyzed northern fur seal remains found in three archaeological sites located along the outer coast of the Northeast Pacific Ocean: Cape Addington Rockshelter in southeast Alaska, Ts’ishaa on the west coast of Vancouver Island, and the Netarts Sandspit site on the Oregon Coast.…
Reconstructing the migration patterns of late Pleistocene mammals from northern Florida, USA
We used analyses of the strontium isotope ( 87 Sr/ 86 Sr) ratios of tooth enamel to reconstruct the migration patterns of fossil mammals collected along the Aucilla River in northern Florida. Specimens date to the late-glacial period and before the last glacial maximum (pre-LGM). Deer and tapir displayed low 87 Sr/ 86 Sr ratios that were similar to the ratios of Florida environments, which suggest that these taxa did not migrate long distance out…
Revisiting old bones: Coupled carbon isotope analysis of bioapatite and collagen as an ecological and palaeoecological tool
Isotopic studies of palaeoecological and ecological questions often use bone collagen or bioapatite as substrates, but rarely both. Substantial new information can be gained from the incorporation of isotopic values from both the organic and inorganic fractions of bone. Here we show that combining isotopic data from both substrates provides valuable and unique insights into (1) trophic relationships and dietary interactions; (2) differences in di…
Global patterns in leaf 13 C discrimination and implications for studies of past and future climate
Fractionation of carbon isotopes by plants during CO 2 uptake and fixation (Δ leaf ) varies with environmental conditions, but quantitative patterns of Δ leaf across environmental gradients at the global scale are lacking. This impedes interpretation of variability in ancient terrestrial organic matter, which encodes climatic and ecological signals. To address this problem, we converted 3,310 published leaf δ 13 C values into mean Δ leaf values f…
Coyote ( Canis latrans ) use of marine resources in coastal California: A new behavior relative to their recent ancestors
Coyotes ( Canis latrans) are known to consume marine foods, but the importance and persistence of marine subsidies to coyotes is unknown. Recent access to a marine subsidy, especially if gained following apex predator loss, may facilitate coyote expansion along coastal routes and amplify the effects of mesopredator release. Our goal was to quantify and contextualize past and present marine resource use by coyotes on the central coast of Californi…
Isotope Analysis in Ecology (12 works) · Biology (9 works) · Stable isotope ratio (8 works) · Geography (7 works) · Archaeology and ancient environmental studies (6 works) · Pleistocene-Era Hominins and Archaeology (6 works) · Ecology (5 works) · Geology (5 works) · Marine animal studies overview (5 works) · Ecology (4 works)