Daniel G Gavin
Biographic Data
| ID | 5141338 |
|---|---|
| NAME | Daniel G Gavin |
| GIVEN NAMES | Daniel G |
| FAMILY NAME | Gavin |
| SIGNATURE | GAVIN D G |
| AFFILIATIONS | University of Oregon |
| ORCID | 0000-0001-8743-3949 |
| VERIFIED | Yes |
| TOTAL WORKS | 20 |
| TOTAL CITATIONS | 30 |
| WORKS AS AUTHOR | 20 |
| WORKS AS EDITOR | 0 |
| FIRST PUBLICATION YEAR | 2001 |
| LATEST PUBLICATION YEAR | 2026 |
| H-INDEX | 3 |
Holocene peat accumulation rate, hiatus events, and hummock development affected by climate, tephra deposition, and geomorphic setting
Peatland development is affected by changing climates, disturbances such as fire, and autogenic processes. Peatlands may be susceptible to periods of peat loss or reduced accumulation resulting in hiatuses in the peat stratigraphy. At eight minerotrophic peatlands in isolated topographic depressions in western Washington State, peat accumulation rates were reconstructed using radiocarbon-dated continuous peat cores. Age-depth models, fit to 7 to …
Chironomid-inferred postglacial temperature reconstruction from Gold Lake, Oregon, USA
A paleotemperature reconstruction inferred from subfossil chironomid (non-biting midge) assemblages in a 13-meter, 14,500-yr lake sediment record from a montane forest in the Pacific Northwest is compared to existing quantitative temperature reconstructions from the Pacific Northwest. With updated temperatures, a regional training set was used to develop a midge-based mean July air temperature (MJAT) inference model (r 2 jack = 0.71, root mean sq…
Reconstruction of Holocene aridity, fire, and vegetation patterns using lake sediments from Dog Lake, Oregon, USA
The Holocene history of vegetation and fire in the northern Great Basin (USA) is poorly understood, especially concerning forest-steppe ecotones. Dog Lake is a rare perennial freshwater landslide-dammed lake located near the lower elevation of conifer forests. The lake has a maximum water depth of 8 m which often lowers by several meters during late summer. A 13 m, 9600-yr sediment core revealed periods of increased aridity from indicators of lak…
Tree-Ring Analysis of Red Spruce Timbers from the Moosilauke Ravine Lodge, White Mountains, New Hampshire
Historic harvesting and mortality from air pollution drastically reduced the abundance of red spruce (Picea rubens), a late-successional dominant of cool-temperate forests of the northeastern U.S. and southeastern Canada, leaving few opportunities to understand the natural growth and disturbance responses of this species. Timbers salvaged from the Moosilauke Ravine Lodge, a structure built from trees harvested in the late 1930s, provided an oppor…
Late glacial through Early Holocene environments inferred using pollen from coprolites and sediments recovered from Paisley Caves, Oregon
The Paisley Cave archeological site in the Northern Great Basin has provided a rich archaeological record from 13,000 to 6000 cal yr BP, including abundant mammalian coprolites preserved in a well-dated stratigraphy. Here we analyze and contrast pollen from within coprolites and pollen in associated sediments to examine vegetation history and assess whether coprolite pollen provides unique information with respect to the coprolite producer, such …
The oldest extant tropical peatland in the world
Tropical peatlands in Southeast Asia cover ∼25 million hectares and exert a strong influence on the global carbon cycle. Recent widespread peatland subsidence and carbon dioxide emissions in response to human activity and climate change have been well documented, but peatland genesis remains poorly understood. Unlike coastal peatlands that established following sea-level stabilization during the mid-Holocene, inland peatlands of Borneo are little…
Millennial-scale decline in coho salmon abundance since the middle Holocene in a coastal Oregon watershed, USA
The population size of anadromous salmon in the Pacific Northwest is strongly influenced by decadal variation in watershed and oceanographic conditions and therefore should also be influenced by larger magnitude millennial-scale variations in these conditions. We studied δ 15 N of bulk organic matter in lake sediment from Woahink Lake, Oregon, as a proxy of marine-derived nutrients (MDN) from spawning coho salmon. We compared this site to a contr…
A Regional Perspective on Holocene Fire–Climate–Human Interactions in the Pacific Northwest of North America
Wildfire plays an important role in ecosystems of the Pacific Northwest, but past relationships among fire, climate, and human actions remain unclear. A multiscale analysis of thirty-four macroscopic charcoal records from a variety of biophysical settings was conducted to reconstruct fire activity for the Pacific Northwest (PNW) during the past 12,000 years. Trends in biomass burning and fire frequency are compared to paleoenvironmental and popul…
Long-term perspective on wildfires in the western USA
Understanding the causes and consequences of wildfires in forests of the western United States requires integrated information about fire, climate changes, and human activity on multiple temporal scales. We use sedimentary charcoal accumulation rates to construct long-term variations in fire during the past 3,000 y in the American West and compare this record to independent fire-history data from historical records and fire scars. There has been …
Climatic control of the biomass-burning decline in the Americas after ad 1500
The significance and cause of the decline in biomass burning across the Americas after ad 1500 is a topic of considerable debate. We synthesized charcoal records (a proxy for biomass burning) from the Americas and from the remainder of the globe over the past 2000 years, and compared these with paleoclimatic records and population reconstructions. A distinct post-ad 1500 decrease in biomass burning is evident, not only in the Americas, but also g…
Peak detection in sediment–charcoal records
Over the past several decades, high-resolution sediment–charcoal records have been increasingly used to reconstruct local fire history. Data analysis methods usually involve a decomposition that detrends a charcoal series and then applies a threshold value to isolate individual peaks, which are interpreted as fire episodes. Despite the proliferation of these studies, methods have evolved largely in the absence of a thorough statistical framework.…
Changes in fire regimes since the Last Glacial Maximum
Climate and human influences on global biomass burning over the past two millennia
Understanding the origin and analysis of sediment-charcoal records with a simulation model
Correspondence of pollen assemblages with forest zones across steep environmental gradients, Olympic Peninsula, Washington, USA
The use of pollen records to document vegetation responses to climatic change in mountains relies on the ability of pollen assemblages to differentiate among elevationally stratified vegetation zones. Comparisons among modem pollen assemblages within mountainous areas provide a basis for assessing this potential. We examined relationships between pollen assemblages, forest vegetation and climate at 65 small lake sites distributed across five fore…
Morphological differentiation of Betula (birch) pollen in northwest North America and its palaeoecological application
Lake sediments from arcto-boreal regions commonly contain abundant Betula pollen. However, palaeoenvironmental interpretations of Betula pollen are often ambiguous because of the lack of reliable morphological features to distinguish among ecologically distinct Betula species in western North America. We measured the grain diameters and pore depths of pollen from three tree-birch species (B. papyrifera, B. kenaica and B. neoalaskana) and two shru…
A statistical approach to evaluating distance metrics and analog assignments for pollen records
The modern analog technique typically uses a distance metric to determine the dissimilarity between fossil and modern biological assemblages. Despite this quantitative approach, interpretation of distance metrics is usually qualitative and rules for selection of analogs tend to be ad hoc . We present a statistical tool, the receiver operating characteristic (ROC) curve, which provides a framework for identifying analogs from distance metrics. If …
Long-Term Fire Regime Estimated from Soil Charcoal in Coastal Temperate Rainforests
Lertzman, K., D. Gavin, D. Hallett, L. Brubaker, D. Lepofsky and R. Mathewes 2002. Long-Term Fire Regime Estimated from Soil Charcoal in Coastal Temperate Rainforests. Conservation Ecology 6(2):5. https://doi.org/10.5751/ES-00432-060205
Postglacial history of subalpine forests, Olympic Peninsula, Washington, USA
To investigate subalpine vegetation history on the Olympic Peninsula, Washington (USA), two pollen, macrofossil and charcoal records were studied in climatically distinct zones: Martins Lake (1415 m) in the moist Tsuga mertensiana zone and Moose Lake (1508 m) in the drier Abies lasiocarpa zone. The interpretation of fossil pollen assemblages was aided by comparisons with 308 modern assemblages from the Olympic Peninsula and western North America.…
Estimation of Inbuilt Age in Radiocarbon Ages of Soil Charcoal for Fire History Studies
Radiocarbon age determinations of wood charcoal are commonly used to date past forest fire events, even though such ages should be greater than the fire event due to the age of the wood at the time of burning. The difference in the 14 C-derived age of charcoal and the time-since-fire (the “inbuilt age”) may be considerable in some vegetation types and thus must be estimated before interpreting fire dates. Two methods were used to estimate the pot…
Estimation of Inbuilt Age in Radiocarbon Ages of Soil Charcoal for Fire History Studies
Radiocarbon age determinations of wood charcoal are commonly used to date past forest fire events, even though such ages should be greater than the fire event due to the age of the wood at the time of burning. The difference in the 14 C-derived age of charcoal and the time-since-fire (the “inbuilt age”) may be considerable in some vegetation types and thus must be estimated before interpreting fire dates. Two methods were used to estimate the pot…
Climatic control of the biomass-burning decline in the Americas after ad 1500
The significance and cause of the decline in biomass burning across the Americas after ad 1500 is a topic of considerable debate. We synthesized charcoal records (a proxy for biomass burning) from the Americas and from the remainder of the globe over the past 2000 years, and compared these with paleoclimatic records and population reconstructions. A distinct post-ad 1500 decrease in biomass burning is evident, not only in the Americas, but also g…
Correspondence of pollen assemblages with forest zones across steep environmental gradients, Olympic Peninsula, Washington, USA
The use of pollen records to document vegetation responses to climatic change in mountains relies on the ability of pollen assemblages to differentiate among elevationally stratified vegetation zones. Comparisons among modem pollen assemblages within mountainous areas provide a basis for assessing this potential. We examined relationships between pollen assemblages, forest vegetation and climate at 65 small lake sites distributed across five fore…
Morphological differentiation of Betula (birch) pollen in northwest North America and its palaeoecological application
Lake sediments from arcto-boreal regions commonly contain abundant Betula pollen. However, palaeoenvironmental interpretations of Betula pollen are often ambiguous because of the lack of reliable morphological features to distinguish among ecologically distinct Betula species in western North America. We measured the grain diameters and pore depths of pollen from three tree-birch species (B. papyrifera, B. kenaica and B. neoalaskana) and two shru…
Postglacial history of subalpine forests, Olympic Peninsula, Washington, USA
To investigate subalpine vegetation history on the Olympic Peninsula, Washington (USA), two pollen, macrofossil and charcoal records were studied in climatically distinct zones: Martins Lake (1415 m) in the moist Tsuga mertensiana zone and Moose Lake (1508 m) in the drier Abies lasiocarpa zone. The interpretation of fossil pollen assemblages was aided by comparisons with 308 modern assemblages from the Olympic Peninsula and western North America.…
Postglacial history of subalpine forests, Olympic Peninsula, Washington, USA
To investigate subalpine vegetation history on the Olympic Peninsula, Washington (USA), two pollen, macrofossil and charcoal records were studied in climatically distinct zones: Martins Lake (1415 m) in the moist Tsuga mertensiana zone and Moose Lake (1508 m) in the drier Abies lasiocarpa zone. The interpretation of fossil pollen assemblages was aided by comparisons with 308 modern assemblages from the Olympic Peninsula and western North America.…
Estimation of Inbuilt Age in Radiocarbon Ages of Soil Charcoal for Fire History Studies
Radiocarbon age determinations of wood charcoal are commonly used to date past forest fire events, even though such ages should be greater than the fire event due to the age of the wood at the time of burning. The difference in the 14 C-derived age of charcoal and the time-since-fire (the “inbuilt age”) may be considerable in some vegetation types and thus must be estimated before interpreting fire dates. Two methods were used to estimate the pot…
Long-Term Fire Regime Estimated from Soil Charcoal in Coastal Temperate Rainforests
Lertzman, K., D. Gavin, D. Hallett, L. Brubaker, D. Lepofsky and R. Mathewes 2002. Long-Term Fire Regime Estimated from Soil Charcoal in Coastal Temperate Rainforests. Conservation Ecology 6(2):5. https://doi.org/10.5751/ES-00432-060205
A statistical approach to evaluating distance metrics and analog assignments for pollen records
The modern analog technique typically uses a distance metric to determine the dissimilarity between fossil and modern biological assemblages. Despite this quantitative approach, interpretation of distance metrics is usually qualitative and rules for selection of analogs tend to be ad hoc . We present a statistical tool, the receiver operating characteristic (ROC) curve, which provides a framework for identifying analogs from distance metrics. If …
Correspondence of pollen assemblages with forest zones across steep environmental gradients, Olympic Peninsula, Washington, USA
The use of pollen records to document vegetation responses to climatic change in mountains relies on the ability of pollen assemblages to differentiate among elevationally stratified vegetation zones. Comparisons among modem pollen assemblages within mountainous areas provide a basis for assessing this potential. We examined relationships between pollen assemblages, forest vegetation and climate at 65 small lake sites distributed across five fore…
Morphological differentiation of Betula (birch) pollen in northwest North America and its palaeoecological application
Lake sediments from arcto-boreal regions commonly contain abundant Betula pollen. However, palaeoenvironmental interpretations of Betula pollen are often ambiguous because of the lack of reliable morphological features to distinguish among ecologically distinct Betula species in western North America. We measured the grain diameters and pore depths of pollen from three tree-birch species (B. papyrifera, B. kenaica and B. neoalaskana) and two shru…
Understanding the origin and analysis of sediment-charcoal records with a simulation model
Changes in fire regimes since the Last Glacial Maximum
Climate and human influences on global biomass burning over the past two millennia
Peak detection in sediment–charcoal records
Over the past several decades, high-resolution sediment–charcoal records have been increasingly used to reconstruct local fire history. Data analysis methods usually involve a decomposition that detrends a charcoal series and then applies a threshold value to isolate individual peaks, which are interpreted as fire episodes. Despite the proliferation of these studies, methods have evolved largely in the absence of a thorough statistical framework.…
Long-term perspective on wildfires in the western USA
Understanding the causes and consequences of wildfires in forests of the western United States requires integrated information about fire, climate changes, and human activity on multiple temporal scales. We use sedimentary charcoal accumulation rates to construct long-term variations in fire during the past 3,000 y in the American West and compare this record to independent fire-history data from historical records and fire scars. There has been …
Climatic control of the biomass-burning decline in the Americas after ad 1500
The significance and cause of the decline in biomass burning across the Americas after ad 1500 is a topic of considerable debate. We synthesized charcoal records (a proxy for biomass burning) from the Americas and from the remainder of the globe over the past 2000 years, and compared these with paleoclimatic records and population reconstructions. A distinct post-ad 1500 decrease in biomass burning is evident, not only in the Americas, but also g…
A Regional Perspective on Holocene Fire–Climate–Human Interactions in the Pacific Northwest of North America
Wildfire plays an important role in ecosystems of the Pacific Northwest, but past relationships among fire, climate, and human actions remain unclear. A multiscale analysis of thirty-four macroscopic charcoal records from a variety of biophysical settings was conducted to reconstruct fire activity for the Pacific Northwest (PNW) during the past 12,000 years. Trends in biomass burning and fire frequency are compared to paleoenvironmental and popul…
Millennial-scale decline in coho salmon abundance since the middle Holocene in a coastal Oregon watershed, USA
The population size of anadromous salmon in the Pacific Northwest is strongly influenced by decadal variation in watershed and oceanographic conditions and therefore should also be influenced by larger magnitude millennial-scale variations in these conditions. We studied δ 15 N of bulk organic matter in lake sediment from Woahink Lake, Oregon, as a proxy of marine-derived nutrients (MDN) from spawning coho salmon. We compared this site to a contr…
The oldest extant tropical peatland in the world
Tropical peatlands in Southeast Asia cover ∼25 million hectares and exert a strong influence on the global carbon cycle. Recent widespread peatland subsidence and carbon dioxide emissions in response to human activity and climate change have been well documented, but peatland genesis remains poorly understood. Unlike coastal peatlands that established following sea-level stabilization during the mid-Holocene, inland peatlands of Borneo are little…
Late glacial through Early Holocene environments inferred using pollen from coprolites and sediments recovered from Paisley Caves, Oregon
The Paisley Cave archeological site in the Northern Great Basin has provided a rich archaeological record from 13,000 to 6000 cal yr BP, including abundant mammalian coprolites preserved in a well-dated stratigraphy. Here we analyze and contrast pollen from within coprolites and pollen in associated sediments to examine vegetation history and assess whether coprolite pollen provides unique information with respect to the coprolite producer, such …
Tree-Ring Analysis of Red Spruce Timbers from the Moosilauke Ravine Lodge, White Mountains, New Hampshire
Historic harvesting and mortality from air pollution drastically reduced the abundance of red spruce (Picea rubens), a late-successional dominant of cool-temperate forests of the northeastern U.S. and southeastern Canada, leaving few opportunities to understand the natural growth and disturbance responses of this species. Timbers salvaged from the Moosilauke Ravine Lodge, a structure built from trees harvested in the late 1930s, provided an oppor…
Chironomid-inferred postglacial temperature reconstruction from Gold Lake, Oregon, USA
A paleotemperature reconstruction inferred from subfossil chironomid (non-biting midge) assemblages in a 13-meter, 14,500-yr lake sediment record from a montane forest in the Pacific Northwest is compared to existing quantitative temperature reconstructions from the Pacific Northwest. With updated temperatures, a regional training set was used to develop a midge-based mean July air temperature (MJAT) inference model (r 2 jack = 0.71, root mean sq…
Reconstruction of Holocene aridity, fire, and vegetation patterns using lake sediments from Dog Lake, Oregon, USA
The Holocene history of vegetation and fire in the northern Great Basin (USA) is poorly understood, especially concerning forest-steppe ecotones. Dog Lake is a rare perennial freshwater landslide-dammed lake located near the lower elevation of conifer forests. The lake has a maximum water depth of 8 m which often lowers by several meters during late summer. A 13 m, 9600-yr sediment core revealed periods of increased aridity from indicators of lak…
Holocene peat accumulation rate, hiatus events, and hummock development affected by climate, tephra deposition, and geomorphic setting
Peatland development is affected by changing climates, disturbances such as fire, and autogenic processes. Peatlands may be susceptible to periods of peat loss or reduced accumulation resulting in hiatuses in the peat stratigraphy. At eight minerotrophic peatlands in isolated topographic depressions in western Washington State, peat accumulation rates were reconstructed using radiocarbon-dated continuous peat cores. Age-depth models, fit to 7 to …
Geology and Paleoclimatology Research (16 works) · Geography (15 works) · Biology (11 works) · Environmental Science (11 works) · Physical geography (11 works) · Fire effects on ecosystems (10 works) · Archaeology (9 works) · Climate change (9 works) · Ecology (8 works) · Holocene (8 works)