Nitrogen enrichment reduces nitrogen and phosphorus resorption through changes to species resorption and plant community composition
Xiao-Tao Lu, Shuang-Li Hou, Sasha C. Reed, Jiang-Xia Yin, Yan-Yu Hu, Hai-Wei Wei, Zhi-Wei Zhang, Guo-Jiao Yang, Zhuo-Yi Liu, Xing-Guo Han
2021, Ecosystems (24) 602-612
Anthropogenic nitrogen (N) deposition has affected plant community composition and nutrient cycling in terrestrial ecosystems worldwide. This includes changes to the way plants use and recycle nutrients, including effects on nutrient resorption, which is a key process through which plants recover nutrients from tissue during senescence. Nutrient resorption has considerable...
Mortality predispositions of conifers across western USA
Wenzhi Wang, Nathan B. English, Charlotte Grossiord, Arthur Gessler, Adrian Das, Nathan L. Stephenson, Christopher H. Baisan, Craig D. Allen, Nate G. McDowell
2021, New Phytologist (229) 831-844
Conifer mortality rates are increasing in western North America, but the physiological mechanisms underlying this trend are not well understood.We examined tree‐ring‐based radial growth along with stable carbon (C) and oxygen (O) isotope composition (δ13C and δ18O, respectively) of dying and surviving conifers at eight old‐growth forest sites across a...
Forest density intensifies the importance of snowpack to growth in water-limited pine forests
Kelly Erika Gleason, John B. Bradford, Anthony W. D’Amato, Shawn Fraver, Brian J. Palik, Michael A. Battaglia
2021, Ecological Applications (31)
Warming climate and resulting declines in seasonal snowpack have been associated with drought stress and tree mortality in seasonally snow‐covered watersheds worldwide. Meanwhile, increasing forest density has further exacerbated drought stress due to intensified tree‐tree competition. Using a uniquely detailed dataset of population‐level forest growth (n=2495 sampled trees), we examined...
Identifying sources and year classes contributing to invasive grass carp in the Laurentian Great Lakes
Gregory W. Whitledge, Duane Chapman, John Farver, Seth Herbst, Nicholas E. Mandrak, Jeffrey G. Miner, Kevin L. Pangle, Patrick Kocovsky
2021, Journal of Great Lakes Research (47) 14-28
Relative contributions of aquaculture-origin and naturally-reproduced grass carp (Ctenopharyngodon idella) in the Laurentian Great Lakes have been unknown. We assessed occurrence and distribution of aquaculture-origin and wild grass carp in the Great Lakes using ploidy and otolith stable oxygen isotope (δ18O) data. We inferred natal river and dispersal from natal...
Lake trout growth is sensitive to spring temperature in southwest Alaska lakes
Vanessa R. von Biela, Bryan A. Black, Daniel B. Young, Peter van der Sleen, Krista K. Bartz, Christian E. Zimmerman
2021, Ecology of Freshwater Fish (30) 88-99
In high‐latitude lakes, air temperature is an important driver of ice cover thickness and duration, which in turn influence water temperature and primary production supporting lake consumers and predators. In lieu of multidecadal observational records necessary to assess the response of lakes to long‐term warming, we used otolith‐based growth records...
Amazon sediment transport and accumulation along the continuum of mixed fluvial and marine processes
Charles A. Nittrouer, David J. DeMaster, Steven A. Kuehl, Alberto G. Figueiredo, Richard W. Sternberg, L. Ercilio C. Faria, Odete M. Silveira, Meade A. Allison, Gail C. Kineke, Andrea S. Ogston, Pedro W.M. Souza Filho, Nils E. Asp, Daniel J. Nowacki, Aaron T. Fricke
2021, Annual Review of Marine Science (13) 501-536
Sediment transfer from land to ocean begins in coastal settings and, for large rivers such as the Amazon, has dramatic impacts over thousands of kilometers covering diverse environmental conditions. In the relatively natural Amazon tidal river, combinations of fluvial and marine processes transition toward the ocean, affecting the transport and...
Validation of the model-predicted spawning area of grass carp Ctenopharyngodon idella in the Sandusky River
Patrick Kocovsky, Nicole R. King, Eric Weimer, Christine Mayer, Song S. Qian
2021, Journal of Great Lakes Research (47) 29-36
Spawning of grass carp, Ctenopharyngodon idella, in the Great Lakes basin was verified when eight fertilized eggs were collected in the Sandusky River, a tributary to Lake Erie, in 2015. Using a fluvial drift model (FluEgg) and simulation modeling, researchers predicted the fertilization...
Fishing preferences, angling behavior, and attitudes toward management: A comparison between White and Nonwhite anglers
H. J. Roop, N. C. Poudyal, Cecil A. Jennings
2021, Human Dimensions of Wildlife (26) 84-89
No abstract available....
Where you trap matters: Implications for integrated sea lamprey management
Scott M. Miehls, Heather Dawson, Alex Maguffee, Nicholas S. Johnson, Michael Jones, Norine Dobiesz
2021, Journal of Great Lakes Research (47) S320-S327
Barriers and pesticides have been used in streams to control sea lamprey in the Laurentian Great Lakes for nearly 70 years. Considerable effort has been spent to develop additional control measures, but much less effort has gone toward identifying how or where additional control measures might be cost-effectively integrated into the...
Effects of plunge pool configuration on downstream passage survival of juvenile blueback herring
Theodore R. Castro-Santos, Kevin Mulligan, Micah Kieffer, Alexander Haro
2021, Aquaculture and Fisheries (6) 135-143
Anadromous alosines are widespread throughout the Northern Hemisphere. Juveniles of this clade are notoriously fragile animals that are at high risk of injury and death associated with passage at hydroelectric facilities. Although turbine mortality is a common concern, conditions encountered when...
Trapping of suspended sediment by submerged aquatic vegetation in a tidal freshwater region: Field observations and long-term trends
Paul A. Work, Maureen A. Downing-Kunz, Judith Z. Drexler
2021, Estuaries and Coasts (44) 734-739
Widespread invasion by non-native, submerged aquatic vegetation (SAV) may modify the sediment budget of an estuary, reducing the availability of inorganic sediment required by marshes to maintain their position in the tidal frame. The instantaneous trapping rate of suspended sediment in SAV patches in an estuary has not previously been...
A synthesis of the biology and ecology of sculpin species in the Laurentian Great Lakes and implications for the adaptive capacity of the benthic ecosystem
Kelly F. Robinson, Charles R. Bronte, David Bunnell, Peter T. Euclide, Darryl W. Hondorp, John J. Janssen, Matthew S. Kornis, Derek H. Ogle, Will Otte, Stephen Riley, Mark Vinson, Shea L. Volkel, Brian Weidel
2021, Reviews in Fisheries Science and Aquaculture (29) 96-121
The Laurentian Great Lakes have experienced recent ecosystem changes that could lead to reductions in adaptive capacity and ultimately a loss of biodiversity and production throughout the food web. Observed changes in Great Lakes benthic communities include declines of native species and widespread success of invasive...
Group density, disease, and season shape territory size and overlap of social carnivores
E. E. Brandell, Nicholas M. Fountain-Jones, Marie L. J. Gilbertson, Paul C. Cross, P. J. Hudson, Douglas W. Smith, Daniel R. Stahler, Craig Packer, Meggan E. Craft
2021, Journal of Animal Ecology (90) 87-101
1. The spatial organization of a population can influence the spread of information, behaviour, and pathogens. Territory size and territory overlap, components of spatial organization, provide key information as these metrics may be indicators of habitat quality, resource dispersion, contact rates, and environmental risk (e.g., indirectly transmitted pathogens). Furthermore, sociality...
Food web fuel differs across habitats and seasons of a tidal freshwater estuary
Matthew J. Young, Emily R. Howe, Teejay O’Rear, Kathleen Berridge, Peter B. Moyle
2021, Estuaries and Coasts (44) 286-301
Estuarine food webs are fueled by multiple different primary producers. However, identifying the relative importance of each producer to consumers is difficult, particularly for fishes that utilize multiple food sources due to both their mobility and their generally high trophic levels. Previous studies have documented broad spatial differences in the...
Estimating inundation of small waterbodies with sub-pixel analysis of Landsat imagery: Long-term trends in surface water area and evaluation of common drought indices
Ibrahima Sall, Christopher J. Jarchow, Brent H. Sigafus, Lisa A Eby, Michael James Forzley, Blake R. Hossack
2021, Remote Sensing in Ecology and Conservation (7) 109-124
Small waterbodies are numerically dominant in many landscapes and provide several important ecosystem services, but automated measurement of waterbodies smaller than a standard Landsat pixel (0.09 ha) remains challenging. To further evaluate sub‐Landsat pixel techniques for estimating inundation extent of small waterbodies (basin area: 0.06–1.79 ha), we used a partial spectral unmixing...
What could explain δ13C signatures in biocrust cyanobacteria of drylands?
Eva Stricker, Grace Cain, Jennifer A. Rudgers, Robert L Sinsabaugh, Vanessa Fernandes, Corey Nelson, Ana Giraldo Silva, Ferran Garcia-Pichel, Jayne Belnap, Anthony Darrouzet-Nardi
2021, Microbial Ecology (81) 134-145
Dryland ecosystems are increasing in geographic extent and contribute greatly to interannual variability in global carbon dynamics. Disentangling interactions among dominant primary producers, including plants and autotrophic microbes, can help partition their contributions to dryland C dynamics. We measured the δ13C signatures of biological soil crust cyanobacteria and dominant plant...
Interpreting and reporting 40Ar/39Ar geochronologic data
Allen J. Schaen, Brian R. Jicha, Kip V. Hodges, Pieter Vermeesch, Mark E. Stelten, Cameron M. Mercer, David Phillips, Tiffany Rivera, Fred Jourdan, Erin L. Matchan, Sidney R. Hemming, Leah E. Morgan, Simon P. Kelley, William S. Cassata, Matt T. Heizler, Paulo M. Vasconcelos, Jeff A. Benowitz, Anthony A.P. Koppers, Darren F. Mark, Elizabeth M. Niespolo, Courtney J. Sprain, William E. Hames, Klaudia F. Kuiper, Brent D. Turrin, Paul R. Renne, Jake Ross, Sebastian Nomade, Herve Guillou, Laura E. Webb, Barbara A. Cohen, Andrew T. Calvert, Nancy Joyce, Morgan Ganderod, Jan Wijbrans, Osamu Ishizuka, Huaiyu He, Adan Ramirez, Jorg Pfander, Margarita Lopez-Martinez, Huaning Qiu, Brad S. Singer
2021, GSA Bulletin (133) 461-487
The 40Ar/39Ar dating method is among the most versatile of geochronometers, having the potential to date a broad variety of K-bearing materials spanning from the time of Earth’s formation into the historical realm. Measurements using modern noble-gas mass spectrometers are now producing 40Ar/39Ar dates with analytical uncertainties of ∼0.1%, thereby...
Sediment budget estimates for a highly impacted embayment with extensive wetland loss
Robert Chant, David K. Ralston, Neil K. Ganju, Casia Pianca, Amy Simonson, Richard Cartwright
2021, Estuaries and Coasts (44) 608-626
External sediment supply is an important control on wetland morphology and vulnerability to storms, sea-level rise, and land use change. Constraining sediment supply and net budgets is difficult due to multiple timescales of variability in hydrodynamic forcing and suspended-sediment concentrations, as well as the fundamental limitations of measurement and modeling...
Estimating age and growth of invasive sea lamprey: A review of approaches and investigation of a new method
Heather A Dawson, Courtney Higgins-Weier, Todd B. Steeves, Nicholas S. Johnson
2021, Journal of Great Lakes Research (47) S570-S579
We review recent advances in age and growth estimation of invasive sea lamprey (Petromyzon marinus) in the Great Lakes and present a more accurate method for growth estimation. To forecast growth and prioritize streams for control actions, sea lamprey managers currently...
Modeling groundwater inflow to the new crater lake at Kīlauea Volcano, Hawaiʻi
Steven E. Ingebritsen, Ashton F. Flinders, James P. Kauahikaua, Paul A. Hsieh
2021, Groundwater (59) 7-15
During the 2018 eruption of Kīlauea Volcano, Hawai'i, scientists relied heavily on a conceptual model of explosive eruptions triggered when lava‐lake levels drop below the water table. Numerical modeling of multiphase groundwater flow and heat transport revealed that, contrary to expectations, liquid water inflow to the...
Source switching maintains dissolved organic matter chemostasis across discharge levels in a large temperate river network
J.D. Hosen, K.S. Aho, Jennifer H. Fair, E.D. Kyzivat, S. Matt, Jonathan Morrison, A. Stubbins, L.C. Weber, B. Yoon, P.A. Raymond
2021, Ecosystems (24) 227-247
Dissolved organic matter (DOM) helps regulate aquatic ecosystem structure and function. In small streams, DOM concentrations are controlled by transport of terrestrial materials to waterways, and are thus highly variable. As rivers become larger, the River Continuum Concept hypothesizes that internal primary production is an increasingly...
Riverbank stability assessment of lower Osage River during hydro-peak flow events: The lower Osage River case (Missouri, USA)
Wesam Mohammed-Ali, Cesar Mendoza, Robert R. Holmes Jr.
2021, International Journal of River Basin Management (19) 335-343
The fluctuation of water level downstream from dams due to hydropower flow releases can negatively affect riverbank stability. This research aims to investigate riverbank instability resulting from the outflow variation of hydropower plants, using Bagnell Dam and the lower Osage River (Missouri, USA) as the basis of analysis. The effects...
Adult sea lamprey respond to induced turbulence in a low current system
Daniel P. Zielinski, Scott M. Miehls, Gordon Burns, Charles Coutant
2021, Journal of Ecohydraulics (6) 82-90
Manipulation of water velocities and turbulence using pumps, propellers, or jets is a promising alternative to physical water control structures to guide fish towards traps or fishways. Sea lamprey (Petromyzon marinus) are a species of concern in much of their native and invasive ranges, and their improved guidance could benefit...
Eradication of sea lampreys from the Laurentian Great Lakes is possible
Michael L. Jones, Jean V. Adams
2021, Journal of Great Lakes Research (47) S776-S781
Eradication has been achieved for many vertebrate pest control programs, primarily on small, isolated islands, but has never been considered a practical goal for invasive sea lampreys in the Laurentian Great Lakes. Our objective was to examine evidence relevant to the feasibility of setting eradication as a management goal for Great Lakes...
Assessment of NMR logging for estimating hydraulic conductivity in glacial aquifers
Alexander K. Kendrick, Rosemary Knight, Carole D. Johnson, Gaisheng Liu, Steven Knobbe, Randall J. Hunt, James J. Butler
2021, Groundwater (59) 31-48
Glacial aquifers are an important source of groundwater in the United States and require accurate characterization to make informed management decisions. One parameter that is crucial for understanding the movement of groundwater is hydraulic conductivity, K. Nuclear magnetic resonance (NMR) logging measures the NMR response associated with...
