Daniel H. Mann
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View article: Quantitative analysis of the impact of seasonal cyclicality on serum 25-hydroxycholecalciferol concentration in Northwest Arctic
Quantitative analysis of the impact of seasonal cyclicality on serum 25-hydroxycholecalciferol concentration in Northwest Arctic Open
Background: 25-hydroxycholecalciferol also known as 25-hydroxyvitamin D plays a vital role in numerous physiological functions within the human body, and its deficiency is associated with conditions such as osteoporosis, cardiovascular dis…
View article: Forest‐Wide Growth Rates Stabilize After Experiencing Accelerated Temperature Changes Near an Alaskan Glacier
Forest‐Wide Growth Rates Stabilize After Experiencing Accelerated Temperature Changes Near an Alaskan Glacier Open
How forests respond to accelerated climate change will affect the terrestrial carbon cycle. To better understand these responses, more examples are needed to assess how tree growth rates react to abrupt changes in growing‐season temperatur…
View article: Wing lengths of three Arctic butterfly species decrease as summers warm in Alaska
Wing lengths of three Arctic butterfly species decrease as summers warm in Alaska Open
Climate warming can cause arthropods to express plastic and/or evolved changes in morphology. Previous studies have demonstrated that body sizes of Arctic butterflies are influenced by the temperatures experienced as larvae. To investigate…
View article: Wing lengths of three Arctic butterfly species decrease as summers warm in Alaska
Wing lengths of three Arctic butterfly species decrease as summers warm in Alaska Open
Climate warming can cause arthropods to express plastic and/or evolved changes in morphology. Previous studies have demonstrated that body sizes of Arctic butterflies are influenced by the temperatures experienced as larvae. To investigate…
View article: Plant succession on glacial moraines in the Arctic Brooks Range along a >125,000-year glacial chronosequence/toposequence
Plant succession on glacial moraines in the Arctic Brooks Range along a >125,000-year glacial chronosequence/toposequence Open
Widespread glacial retreat is now occurring in many arctic mountain ranges, yet little is known about primary succession following deglaciation in these settings. Newly created habitats could provide refugia for flora and fauna whose range…
View article: Plant succession on glacial moraines in the Arctic Brooks Range along a >125,000-year glacial chronosequence/toposequence
Plant succession on glacial moraines in the Arctic Brooks Range along a >125,000-year glacial chronosequence/toposequence Open
Widespread glacial retreat is now occurring in many arctic mountain ranges, yet little is known about primary succession following deglaciation in these settings. Newly created habitats could provide refugia for flora and fauna whose range…
View article: RDA for Data Management Planning Community Cross-fertilisation Workshop Summary
RDA for Data Management Planning Community Cross-fertilisation Workshop Summary Open
<p>The community cross-fertilisation workshop, ‘RDA for Data Management Planning’, brought chairs and members of RDA Working Groups (WGs) and Interest Groups (IGs) together, with members of the wider research data communi…
View article: Prehistoric perspectives can help interpret the present: 14 000 years of moose (<i>Alces alces</i>) in the Western Arctic
Prehistoric perspectives can help interpret the present: 14 000 years of moose (<i>Alces alces</i>) in the Western Arctic Open
Rapidly changing climate at high latitudes has triggered a search for bellwethers of ecological change there. If the initial signs of change can be identified, perhaps we can predict where these changes will lead. Large-bodied, terrestrial…
View article: Ecosystems at Glacier Margins Can Serve as Climate‐Change Laboratories
Ecosystems at Glacier Margins Can Serve as Climate‐Change Laboratories Open
Reconstructing how biota have responded to fast‐paced warming events in the past can help predict their responses to rapid climate changes in the future. Here we suggest that natural communities located near glaciers are useful laboratorie…
View article: Red Planets
Red Planets Open
The desert in the South of Jordan is a popular location for multimillion-dollar productions of science fiction films. The combination of vast arid lands and lucrative tax rebates offered by the Royal Film Commission make the Jordanian dese…
View article: Ancient horse genomes reveal the timing and extent of dispersals across the Bering Land Bridge
Ancient horse genomes reveal the timing and extent of dispersals across the Bering Land Bridge Open
The Bering Land Bridge (BLB) last connected Eurasia and North America during the Late Pleistocene. Although the BLB would have enabled transfers of terrestrial biota in both directions, it also acted as an ecological filter whose permeabil…
View article: Tussocks enduring or shrubs greening: Alternate responses to changing fire regimes in the Noatak River Valley, Alaska, 2017-2020
Tussocks enduring or shrubs greening: Alternate responses to changing fire regimes in the Noatak River Valley, Alaska, 2017-2020 Open
As the Arctic warms, tundra wildfires are expected to become more frequent and severe. Assessing how the most flammable regions of the tundra respond to burning can inform us about how the rest of the Arctic may be affected by climate chan…
View article: Timing and Potential Causes of 19th-Century Glacier Advances in Coastal Alaska Based on Tree-Ring Dating and Historical Accounts
Timing and Potential Causes of 19th-Century Glacier Advances in Coastal Alaska Based on Tree-Ring Dating and Historical Accounts Open
The Little Ice Age (LIA), ca. CE 1250–1850, was a cold period of global extent, with the nature and timing of reduced temperatures varying by region. The Gulf of Alaska (GOA) is a key location to study the climatic drivers of glacier fluct…
View article: Traumatic Resin Ducts in Alaska Mountain Hemlock Trees Provide a New Proxy for Winter Storminess
Traumatic Resin Ducts in Alaska Mountain Hemlock Trees Provide a New Proxy for Winter Storminess Open
Winter is a critical season for land‐surface feedbacks and ecosystem processes; however, most high‐latitude paleo‐environmental reconstructions are blind to cold season conditions. Here we introduce a winter‐sensitive, paleo‐proxy record t…
View article: Holocene Vegetation, Climate, and Carbon History on Western Kodiak Island, Alaska
Holocene Vegetation, Climate, and Carbon History on Western Kodiak Island, Alaska Open
At Phalarope Pond, western Kodiak Island, a multidisciplinary study using pollen and spores, macrofossils, stable isotopes, and carbon accumulation provides the Holocene vegetation and climate history following the deglaciation that began …
View article: A decade of remotely sensed observations highlight complex processes linked to coastal permafrost bluff erosion in the Arctic
A decade of remotely sensed observations highlight complex processes linked to coastal permafrost bluff erosion in the Arctic Open
Eroding permafrost coasts are likely indicators and integrators of changes in the Arctic System as they
\nare susceptible to the combined effects of declining sea ice extent, increases in open water duration,
\nmore frequent and impactful …
View article: Climate‐driven ecological stability as a globally shared cause of Late Quaternary megafaunal extinctions: the Plaids and Stripes Hypothesis
Climate‐driven ecological stability as a globally shared cause of Late Quaternary megafaunal extinctions: the Plaids and Stripes Hypothesis Open
Controversy persists about why so many large‐bodied mammal species went extinct around the end of the last ice age. Resolving this is important for understanding extinction processes in general, for assessing the ecological roles of humans…
View article: Alaskan marine transgressions record out-of-phase Arctic Ocean glaciation during the last interglacial
Alaskan marine transgressions record out-of-phase Arctic Ocean glaciation during the last interglacial Open
Ongoing climate change focuses attention on the Arctic cryosphere’s responses to past and future climate states. Although it is now recognized the Arctic Ocean Basin was covered by ice sheets and their associated floating ice shelves severa…
View article: Temporal and spatial variability in coastline response to declining sea-ice in northwest Alaska
Temporal and spatial variability in coastline response to declining sea-ice in northwest Alaska Open
Arctic sea-ice is declining in extent, leaving coastlines exposed to more storm-wave events. There is an urgent need to understand how these changes affect geomorphic processes along Arctic coasts. Here we describe spatial and temporal pat…
View article: Remotely Sensing the Morphometrics and Dynamics of a Cold Region Dune Field Using Historical Aerial Photography and Airborne LiDAR Data
Remotely Sensing the Morphometrics and Dynamics of a Cold Region Dune Field Using Historical Aerial Photography and Airborne LiDAR Data Open
This study uses an airborne Light Detection and Ranging (LiDAR) survey, historical aerial photography and historical climate data to describe the character and dynamics of the Nogahabara Sand Dunes, a sub-Arctic dune field in interior Alas…
View article: Can snowshoe hares control treeline expansions?
Can snowshoe hares control treeline expansions? Open
Treelines in Alaska are advancing in elevation and latitude because of climate warming, which is expanding the habitat available for boreal wildlife species, including snowshoe hares ( Lepus americanus ). Snowshoe hares are already present…
View article: Climate-Growth Relationships Along a Black Spruce Toposequence in Interior Alaska
Climate-Growth Relationships Along a Black Spruce Toposequence in Interior Alaska Open
Despite its wide geographic distribution and important role in boreal forest fire regimes, little is known about the climate-growth relationships of black spruce (Picea mariana [Mill.] B.S.P.). We used site- and tree-level analyses to eval…
View article: Petroleum biomarkers as tracers of <i>Exxon Valdez</i> oil
Petroleum biomarkers as tracers of <i>Exxon Valdez</i> oil Open
Over the past quarter century, petroleum biomarkers have persisted in sequestered Exxon Valdez oil in Prince William Sound and the Gulf of Alaska (USA), and hence the oil has remained identifiable. These biomarkers are molecular fossils de…
View article: Life and extinction of megafauna in the ice-age Arctic
Life and extinction of megafauna in the ice-age Arctic Open
Significance Understanding species extinction is a major concern today, and past extinctions provide valuable lessons. Numerous mammal species became extinct in the Arctic at the end of the ice age, but it is unclear why. By comparing numb…
View article: Soil surface organic layers in Arctic Alaska: Spatial distribution, rates of formation, and microclimatic effects
Soil surface organic layers in Arctic Alaska: Spatial distribution, rates of formation, and microclimatic effects Open
Organic layers of living and dead vegetation cover the ground surface in many permafrost landscapes and play important roles in ecosystem processes. These soil surface organic layers (SSOLs) store large amounts of carbon and buffer the und…