Publications
Listed here are publications, reports and articles by the Land Change Science Program in the USGS Ecosystems Mission Area.
Filter Total Items: 1145
Considerations for Globigerinoides ruber (white and pink) paleoceanography: Comprehensive insights from a long‐running sediment trap Considerations for Globigerinoides ruber (white and pink) paleoceanography: Comprehensive insights from a long‐running sediment trap
We present a detailed analysis of the seasonal distribution, size, morphological variability and geochemistry of co‐occurring pink and white chromotypes of Globigerinoides ruberfrom a high‐resolution (1–2 weeks) and long‐running sediment trap time series in the northern Gulf of Mexico. We find no difference in the seasonal flux of the two chromotypes. Although flux of G. ruber is...
Authors
Julie Richey, Kaustubh Thirumalai, Deborah Khider, Caitlin E. Reynolds, Judson Partin, Terrence Quinn
Climate change, coral loss, and the curious case of the parrotfish paradigm: Why don't marine protected areas improve reef resilience? Climate change, coral loss, and the curious case of the parrotfish paradigm: Why don't marine protected areas improve reef resilience?
Scientists have advocated for local interventions, such as creating marine protected areas and implementing fishery restrictions, as ways to mitigate local stressors to limit the effects of climate change on reef-building corals. However, in a literature review, we find little empirical support for the notion of managed resilience. We outline some reasons for why marine protected areas...
Authors
John Bruno, Isabelle Cote, Lauren Toth
Changes in the active, dead, and dormant microbial community structure across a Pleistocene permafrost chronosequence Changes in the active, dead, and dormant microbial community structure across a Pleistocene permafrost chronosequence
Permafrost hosts a community of microorganisms that survive and reproduce for millennia despite extreme environmental conditions such as water stress, subzero temperatures, high salinity, and low nutrient availability. Many studies focused on permafrost microbial community composition use DNA-based methods such as metagenomic and 16S rRNA gene sequencing. However, these methods do not...
Authors
Alexander Burkert, Thomas Douglas, Mark Waldrop, Rachel Mackelprang
Effect of permafrost thaw on plant and soil fungal community in the boreal forest: Does fungal community change mediate plant productivity response? Effect of permafrost thaw on plant and soil fungal community in the boreal forest: Does fungal community change mediate plant productivity response?
Permafrost thaw is leading to rapid shifts in boreal ecosystem function. Permafrost thaw affects soil carbon turnover through changes in soil hydrology, however, the biotic mechanisms regulating plant community response remain elusive. Here, we measured the response of fungal community composition and soil nutrient content in an intact permafrost plateau forest soil and an adjacent...
Authors
Ursel M.E Schütte, Jeremiah Henning, Yuzhen Ye, A. Bowling, James Ford, Helene Genet, Mark Waldrop, Merritt Turetsky, Jeffrey White, James Bever
Biological and mineralogical controls over cycling of low molecular weight organic compounds along a soil chronosequence Biological and mineralogical controls over cycling of low molecular weight organic compounds along a soil chronosequence
Low molecular weight organic compounds (LMWOC) represent a small but critical component of soil organic matter (SOM) for microbial growth and metabolism. The fate of these compounds is largely under microbial control, yet outside the cell, intrinsic soil properties can also significantly influence their turnover and retention. Using a chronosequence representing 1200 ka of pedogenic...
Authors
Jack McFarland, Mark Waldrop, Daniel Strawn, Courtney Creamer, Corey Lawrence, Monica Haw
The 4.2 ka event, ENSO, and coral reef development The 4.2 ka event, ENSO, and coral reef development
Variability of sea-surface temperature related to shifts in the mode of the El Niño–Southern Oscillation (ENSO) has been implicated as a possible forcing mechanism for the global-scale changes in tropical and subtropical precipitation known as the 4.2 ka event. We review records of coral reef development and paleoceanography from the tropical eastern Pacific (TEP) to evaluate the...
Authors
Lauren Toth, Richard Aronson
Reconstructing precipitation in the tropical South Pacific from dinosterol 2H/1H ratios in lake sediment Reconstructing precipitation in the tropical South Pacific from dinosterol 2H/1H ratios in lake sediment
The South Pacific Convergence Zone (SPCZ) is the Southern Hemisphere’s largest precipitation feature supplying freshwater to 11 million people. Despite its significance, little is known about the location and intensity of SPCZ precipitation prior to instrumental records, hindering attempts to predict precipitation changes in a warming world. Here we use sedimentary molecular fossils to...
Authors
Ashley Maloney, Daniel Nelson, Julie Richey, Matthew Prebble, David Sear, Jonathan Hassall, Peter Langdon, Ian Croudace, Atun Zawadzki, Julian Sachs
Early-warning signals of individual tree mortality based on annual radial growth Early-warning signals of individual tree mortality based on annual radial growth
Tree mortality is a key driver of forest dynamics and its occurrence is projected to increase in the future due to climate change. Despite recent advances in our understanding of the physiological mechanisms leading to death, we still lack robust indicators of mortality risk that could be applied at the individual tree scale. Here, we build on a previous contribution exploring the...
Authors
Maxime Cailleret, Vasilis Dakos, Steven Jansen, Elisabeth M. R. Robert, Tuomas Aakala, Mariano Amoroso, Joe A. Antos, Christof Bigler, Harald Bugmann, Marco Caccianaga, Jesus-Julio Camarero, Paolo Cherubini, Marie Coyea, Katarina Cufar, Adrian J. Das, Hendrik Davi, Guillermo Gea-Izquierdo, Sten Gillner, Laurel Haavik, Henrik Hartmann, Ana-Maria Heres, Kevin Hultine, Pavel Janda, Jeffrey Kane, Viachelsav Kharuk, Thomas Kitzberger, Tamir Klein, Tom Levanic, Juan-Carlos Linares, Fabio Lombardi, Harri Makinen, Ilona Mészáros, Juha Metsaranta, Walter Oberhuber, Andreas Papadopoulos, Any Petritan, Brigitte Rohner, Gabriel Sanguesa-Barreda, Jeremy Smith, Amanda Stan, Dejan Stojanovic, Maria-Laura Suarez, Miroslav Svoboda, Volodymyr Trotsiuk, Ricardo Villalba, Alana Westwood, Peter Wyckoff, Jordi Martínez-Vilalta
Warming effects of spring rainfall increase methane emissions from thawing permafrost Warming effects of spring rainfall increase methane emissions from thawing permafrost
Methane emissions regulate the near‐term global warming potential of permafrost thaw, particularly where loss of ice‐rich permafrost converts forest and tundra into wetlands. Northern latitudes are expected to get warmer and wetter, and while there is consensus that warming will increase thaw and methane emissions, effects of increased precipitation are uncertain. At a thawing wetland...
Authors
Rebecca Neumann, C.J. Moorberg, J.D. Lundquist, J.C. Turner, Mark Waldrop, Jack McFarland, E.S. Euskirchen, C.W. Edgar, M. Turetsky
Remobilization of old permafrost carbon to Chukchi Sea sediments during the end of the last deglaciation Remobilization of old permafrost carbon to Chukchi Sea sediments during the end of the last deglaciation
Climate warming is expected to destabilize permafrost carbon (PF‐C) by thaw‐erosion and deepening of the seasonally thawed active layer and thereby promote PF‐C mineralization to CO2 and CH4. A similar PF‐C remobilization might have contributed to the increase in atmospheric CO2 during deglacial warming after the last glacial maximum. Using carbon isotopes and terrestrial biomarkers...
Authors
Jannik Martens, Birgit Wild, Christof Pearce, Tommaso Tesi, August Andersson, Lisa Broder, Matt O’Regan, Martin Jakobsson, Martin Skold, Laura Gemery, Thomas Cronin
Evidence for conservative transport of dissolved organic carbon in major river basins in the Gulf of Maine Watershed Evidence for conservative transport of dissolved organic carbon in major river basins in the Gulf of Maine Watershed
Transport and fate of dissolved organic carbon (DOC) in rivers are important aspects of the carbon cycle and the critical linkage between terrestrial, aquatic, and marine systems. Recent studies have quantified fluvial export to the marine environment in many systems, but in-stream losses of DOC are poorly constrained. This study compares DOC yields (kg C/ha) between the area-weighted...
Authors
Thomas Huntington, Collin Roesler, George Aiken
Little islands recording global events: Late Quaternary sea level history and paleozoogeography of Santa Barbara and Anacapa Islands, Channel Islands National Park, California Little islands recording global events: Late Quaternary sea level history and paleozoogeography of Santa Barbara and Anacapa Islands, Channel Islands National Park, California
Marine terraces are common on the Pacific Coast of North America and record interglacial high-sea stands superimposed on either stable or tectonically rising crustal blocks. Despite many years of study of these landforms in southern California, little work on terraces has been conducted on the two smallest of the California Channel Islands, Santa Barbara Island (SBI) and Anacapa Island...
Authors
Daniel R. Muhs, Lindsey Groves