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Global Change Biology

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https://www.readbyqxmd.com/read/28434200/land-use-for-animal-production-in-global-change-studies-defining-and-characterizing-a-framework
#1
Leanne N Phelps, Jed O Kaplan
Land use for animal production influences the earth system in a variety of ways, including local-scale modification to biodiversity, soils, and nutrient cycling; regional changes in albedo and hydrology; and global-scale changes in greenhouse gas and aerosol concentrations. Pasture is furthermore the single most extensive form of land cover, currently comprising about 22 - 26% of the earth's ice-free land surface. Despite the importance and variable expressions of animal production, distinctions among different systems are effectively absent from studies of land use and land cover change...
April 23, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28429531/sugar-enrichment-provides-evidence-for-a-role-of-nitrogen-fixation-in-coral-bleaching
#2
Claudia Pogoreutz, Nils Rädecker, Anny Cárdenas, Astrid Gärdes, Christian R Voolstra, Christian Wild
The disruption of the coral-algae symbiosis (coral bleaching) due to rising sea surface temperatures has become an unprecedented global threat to coral reefs. Despite decades of research, our ability to manage mass bleaching events remains hampered by an incomplete mechanistic understanding of the processes involved. In this study, we induced a coral bleaching phenotype in the absence of heat and light stress by adding sugars. The sugar addition resulted in coral symbiotic breakdown accompanied by a fourfold increase of coral-associated microbial nitrogen fixation...
April 21, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28426175/differences-in-xylem-and-leaf-hydraulic-traits-explain-differences-in-drought-tolerance-among-mature-amazon-rainforest-trees
#3
Thomas L Powell, James K Wheeler, Alex A R de Oliveira, Antonio Carlos Lola da Costa, Scott R Saleska, Patrick Meir, Paul R Moorcroft
Considerable uncertainty surrounds the impacts of anthropogenic climate change on the composition and structure Amazon forests. Two large-scale ecosystem drought experiments in the eastern Brazilian Amazon observed increases in mortality rates among some tree species but not others; and therefore, the physiological traits underpinning these differential demographic responses were investigated. Xylem pressure at 50% conductivity (xylem-P50 ), leaf turgor loss point (TLP), cellular osmotic potential (πo ) and cellular bulk modulus of elasticity (ε), all traits mechanistically linked to drought tolerance, were measured on upper canopy branches and leaves of mature trees from selected species growing at the two drought experiment sites...
April 20, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28423463/temperature-regulation-of-marine-heterotrophic-prokaryotes-increases-latitudinally-as-a-breach-between-bottom-up-and-top-down-controls
#4
Xosé Anxelu G Morán, Josep M Gasol, Massimo C Pernice, Jean-François Mangot, Ramon Massana, Elena Lara, Dolors Vaqué, Carlos M Duarte
Planktonic heterotrophic prokaryotes make up the largest living biomass and process most organic matter in the ocean. Determining when and where the biomass and activity of heterotrophic prokaryotes are controlled by resource availability (bottom-up), predation and viral lysis (top-down) or temperature will help in future carbon cycling predictions. We conducted an extensive survey across subtropical and tropical waters of the Atlantic, Indian and Pacific Oceans during the Malaspina 2010 Global Circumnavigation Expedition and assessed indices for these three types of controls at 109 stations (mostly from the surface to 4000 m depth)...
April 19, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28423462/geochemical-signatures-of-benthic-foraminiferal-shells-from-a-heat-polluted-shallow-marine-environment-provide-field-evidence-for-growth-and-calcification-under-extreme-warmth
#5
Danna Titelboim, Aleksey Sadekov, Ahuva Almogi-Labin, Barak Herut, Michal Kucera, Christiane Schmidt, Orit Hyams-Kaphzan, Sigal Abramovich
Shallow marine calcifiers play an important role as marine ecosystem engineers and in the global carbon cycle. Understanding their response to warming is essential to evaluate the fate of marine ecosystems under global change scenarios. A rare opportunity to test the effect of warming acting on natural ecosystems is by investigation of heat-polluted areas. Here we study growth and calcification in benthic foraminifera that inhabit a thermally polluted coastal area in Israel, where they are exposed to elevated temperatures reaching up to ~42°C in summer...
April 19, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28418158/the-phenology-of-leaf-quality-and-its-within-canopy-variation-are-essential-for-accurate-modeling-of-photosynthesis-in-tropical-evergreen-forests
#6
Jin Wu, Shawn P Serbin, Xiangtao Xu, Loren P Albert, Min Chen, Ran Meng, Scott R Saleska, Alistair Rogers
Leaf quantity (i.e. canopy leaf area index, LAI), quality (i.e. per-area photosynthetic capacity), and longevity all influence the photosynthetic seasonality of tropical evergreen forests. However, these components of tropical leaf phenology are poorly represented in most terrestrial biosphere models (TBMs). Here, we explored alternative options for the representation of leaf phenology effects in TBMs that employ the Farquahar, von Caemmerer & Berry (FvCB) representation of CO2 assimilation. We developed a two-fraction leaf (sun and shade), two-layer canopy (upper and lower) photosynthesis model to evaluate different modeling approaches and assessed three components of phenological variations (i...
April 18, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28418105/climate-and-successional-related-changes-in-functional-composition-of-european-forests-are-strongly-driven-by-tree-mortality
#7
Paloma Ruiz-Benito, Sophia Ratcliffe, Miguel A Zavala, Jordi Martínez-Vilalta, Albert Vilà-Cabrera, Francisco Lloret, Jaime Madrigal-González, Christian Wirth, Sarah Greenwood, Gerald Kändler, Aleksi Lehtonen, Jens Kattge, Jonas Dahlgren, Alistair S Jump
Intense droughts combined with increased temperatures are one of the major threats to forest persistence in the 21(st) century. Despite the direct impact of climate change on forest growth and shifts in species abundance, the effect of altered demography on changes in the composition of functional traits is not well known. We sought to: (1) quantify the recent changes in functional composition of European forests; (2) identify the relative importance of climate change, mean climate and forest development for changes in functional composition; and (3) analyse the roles of tree mortality and growth underlying any functional changes in different forest types...
April 18, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28418083/inter-annual-variation-in-methane-emissions-from-tropical-wetlands-triggered-by-repeated-el-ni%C3%A3-o-southern-oscillation
#8
Qiuan Zhu, Changhui Peng, Philippe Ciais, Hong Jiang, Jinxun Liu, Philippe Bousquet, Shiqin Li, Jie Chang, Xiuqin Fang, Xiaolu Zhou, Huai Chen, Shirong Liu, Guanghui Lin, Peng Gong, Meng Wang, Han Wang, Wenhua Xiang, Jing Chen
Methane (CH4 ) emissions from tropical wetlands contribute 60-80% of global natural wetland CH4 emissions. Decreased wetland CH4 emissions can act as a negative feedback mechanism for future climate warming and vice versa. The impact of the El Niño-Southern Oscillation (ENSO) on CH4 emissions from wetlands remains poorly quantified at both regional and global scales, and El Niño events are expected to become more severe based on climate models projections. We use a process-based model of global wetland CH4 emissions to investigate the impacts of the ENSO on CH4 emissions in tropical wetlands for the period from 1950 to 2012...
April 18, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28417562/climate-variability-drives-recent-tree-mortality-in-europe
#9
Mathias Neumann, Volker Mues, Adam Moreno, Hubert Hasenauer, Rupert Seidl
Tree mortality is an important process in forest ecosystems, frequently hypothesized to be highly climate sensitive. Yet, tree death remains one of the least understood processes of forest dynamics. Recently, changes in tree mortality have been observed in forests around the globe, which could profoundly affect ecosystem functioning and services provisioning to society. We describe continental-scale patterns of recent tree mortality from the only consistent pan-European forest monitoring network, identifying recent mortality hotspots in southern and northern Europe...
April 17, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28417528/attribution-of-seasonal-leaf-area-index-trends-in-the-northern-latitudes-with-optimally-integrated-ecosystem-models
#10
Zaichun Zhu, Shilong Piao, Xu Lian, Ranga B Myneni, Shushi Peng, Hui Yang
Significant increases in remotely sensed vegetation indices in the northern latitudes since the 1980s have been detected and attributed at annual and growing season scales. However, we presently lack a systematic understanding of how vegetation responds to asymmetric seasonal environmental changes. In this study, we first investigated trends in the seasonal mean leaf area index (LAI) at northern latitudes (north of 30°N) between 1982 and 2009 using three remotely sensed long-term LAI data sets. The most significant LAI increases occurred in summer (0...
April 17, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28407457/dynamics-of-sediment-carbon-stocks-across-intertidal-wetland-habitats-of-moreton-bay-australia
#11
Matthew A Hayes, Amber Jesse, Bruce Hawke, Jeff Baldock, Basam Tabet, David Lockington, Catherine E Lovelock
Coastal wetlands are known for high carbon storage within their sediments, but our understanding of the variation in carbon storage among intertidal habitats, particularly over geomorphological settings and along elevation gradients, are limited. Here, we collected 352 cores from 18 sites across Moreton Bay, Australia. We assessed variation in sediment organic carbon (OC) stocks among different geomorphological settings (wetlands within riverine settings along with those with reduced riverine influence located on tide-dominated sand islands), across elevation gradients, with distance from shore and among habitat and vegetation types...
April 13, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28407324/changes-in-nutrient-concentrations-of-leaves-and-roots-in-response-to-global-change-factors
#12
Jordi Sardans, Oriol Grau, Han Y H Chen, Ivan A Janssens, Philippe Ciais, Shilong Piao, Josep Peñuelas
Global Change impacts on biogeochemical cycles have been widely studied, but our understanding of whether the responses of plant elemental composition to Global Change drivers differ between above- and belowground plant organs remains incomplete. We conducted a meta-analysis of 201 reports including 1,687 observations of studies that have analyzed simultaneously N and P concentrations changes in leaves and roots in the same plants in response to drought, elevated [CO2 ], and N and P fertilization around the world, and contrasted the results within those obtained with a general database (838 reports and 14,772 observations) that analyzed the changes in N and P concentrations in leaves and/or roots of plants submitted to the commented global change drivers...
April 13, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28397333/soil-carbon-sequestration-potential-of-permanent-pasture-and-continuous-cropping-soils-in-new-zealand
#13
S R McNally, M H Beare, D Curtin, E D Meenken, F Kelliher, R Calvelo Pereira, Q Shen, J Baldock
Understanding soil organic carbon (SOC) sequestration is important to develop strategies to increase the SOC stock and, thereby, off-set some of the increases in atmospheric carbon dioxide. Although the capacity of soils to store SOC in a stable form is commonly attributed to the fine (clay + fine silt) fraction, the properties of the fine fraction that determine the SOC stabilisation capacity are poorly known. The aim of this study was to develop an improved model to estimate the SOC stabilisation capacity of Allophanic (Andisols) and non-Allophanic topsoils (0-15 cm) and, as a case study, to apply the model to predict the sequestration potential of pastoral soils across New Zealand...
April 11, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28391611/point-stresses-during-reproductive-stage-rather-than-warming-seasonal-temperature-determines-yield-in-temperate-rice
#14
Matthew B Espe, Jim E Hill, Robert J Hijmans, Kent McKenzie, Randall Mutters, Luis A Espino, Michelle Leinfelder-Miles, Chris van Kessel, Bruce A Linquist
Climate change is predicted to shift temperature regimes in most agricultural areas with temperature changes expected to impact yields of most crops, including rice. These temperature-driven effects can be classified into point stresses, where a temperature event during a sensitive stage drives a reduction in yield, or seasonal warming losses, where raised temperature is thought to increases maintenance energy demands and thereby decreases available resources for yield formation. Simultaneous estimation of the magnitude of each temperature effect on yield has not been well documented due to the inherent difficulty in separating their effects...
April 9, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28390081/symbiodinium-mitigate-the-combined-effects-of-hypoxia-and-acidification-on-a-non-calcifying-cnidarian
#15
Shannon G Klein, Kylie A Pitt, Matthew R Nitschke, Samantha Goyen, David T Welsh, David J Suggett, Anthony R Carroll
Anthropogenic nutrient inputs enhance microbial respiration within many coastal ecosystems, driving concurrent hypoxia and acidification. During photosynthesis, Symbiodinium spp., the microalgal endosymbionts of cnidarians and other marine phyla, produce O2 and assimilate CO2 , and thus potentially mitigate the exposure of the host to these stresses. However, such a role for Symbiodinium remains untested for non-calcifying cnidarians. We therefore contrasted the fitness of symbiotic and aposymbiotic polyps of a model host jellyfish (Cassiopea sp...
April 8, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28387042/circumpolar-dynamics-of-a-marine-top-predator-track-ocean-warming-rates
#16
S Descamps, T Anker-Nilssen, R T Barrett, D B Irons, F Merkel, G J Robertson, N G Yoccoz, M L Mallory, W A Montevecchi, D Boertmann, Y Artukhin, S Christensen-Dalsgaard, K E Erikstad, H G Gilchrist, A L Labansen, S-H Lorentsen, A Mosbech, B Olsen, A Petersen, J-F Rail, H M Renner, H Strøm, G H Systad, S I Wilhelm, L Zelenskaya
Global warming is a non-linear process and temperature may increase in a stepwise manner. Periods of abrupt warming can trigger persistent changes in the state of ecosystems, also called regime shifts. The responses of organisms to abrupt warming and associated regime shifts can be unlike responses to periods of slow or moderate change. Understanding of non-linearity in the biological responses to climate warming is needed to assess the consequences of ongoing climate change. Here we demonstrate that the population dynamics of a long-lived, wide-ranging marine predator are associated with changes in the rate of ocean warming...
April 7, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28386964/global-climate-change-will-increase-the-abundance-of-symbiotic-nitrogen-fixing-trees-in-much-of-north-america
#17
Wenying Liao, Duncan N L Menge, Jeremy W Lichstein, Gregorio Ángeles-Pérez
Symbiotic nitrogen (N)-fixing trees can drive N and carbon cycling, and thus are critical components of future climate projections. Despite detailed understanding of how climate influences N-fixation enzyme activity and physiology, comparatively little is known about how climate influences N-fixing tree abundance. Here, we used forest inventory data from the USA and Mexico (>125,000 plots) along with climate data to address two questions: (1) How does the abundance distribution of N-fixing trees (rhizobial, actinorhizal, and both types together) vary with mean annual temperature (MAT) and precipitation (MAP)? (2) How will changing climate shift the abundance distribution of N-fixing trees? We found that rhizobial N-fixing trees were nearly absent below 15(◦) C MAT, but above 15(◦) C MAT, they increased in abundance as temperature rose...
April 7, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28386943/pinus-taeda-forest-growth-predictions-in-the-21-st-century-vary-with-site-mean-annual-temperature-and-site-quality
#18
Carlos A Gonzalez-Benecke, Robert O Teskey, Heather Dinon-Aldridge, Timothy A Martin
Climate projections from 20 downscaled global climate models (GCMs) were used with the 3-PG model to predict the future productivity and water use of planted loblolly pine (Pinus taeda) growing across the southeastern U.S. Predictions were made using Representative Concentration Pathways (RCP) 4.5 and 8.5. These represent scenarios in which total radiative forcing stabilizes before 2100 (RCP 4.5) or continues increasing throughout the century (RCP 8.5). Thirty six sites evenly distributed across the native range of the species were used in the analysis...
April 7, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28380283/dynamics-of-soil-co2-efflux-under-varying-atmospheric-co2-concentrations-reveal-dominance-of-slow-processes
#19
Dohyoung Kim, Ram Oren, James S Clark, Sari Palmroth, A Christopher Oishi, Heather R McCarthy, Chris A Maier, Kurt Johnsen
We evaluated the effect on soil CO2 efflux (FCO2 ) of sudden changes in photosynthetic rates by altering CO2 concentration in plots subjected to +200 ppmv for 15 years. Five-day intervals of exposure to elevated CO2 (eCO2 ) ranging 1.0 - 1.8 times ambient did not affect FCO2 . FCO2 did not decrease until four months after termination of the long-term eCO2 treatment, longer than the 10 days observed for decrease of FCO2 after experimental blocking of C flow to belowground, but shorter than the ~13 months it took for increase of FCO2 following the initiation of eCO2 ...
April 5, 2017: Global Change Biology
https://www.readbyqxmd.com/read/28378354/ecological-regime-shift-drives-declining-growth-rates-of-sea-turtles-throughout-the-west-atlantic
#20
Karen A Bjorndal, Alan B Bolten, Milani Chaloupka, Vincent S Saba, Cláudio Bellini, Maria A G Marcovaldi, Armando J B Santos, Luis Felipe Wurdig Bortolon, Anne B Meylan, Peter A Meylan, Jennifer Gray, Robert Hardy, Beth Brost, Michael Bresette, Jonathan C Gorham, Stephen Connett, Barbara Van Sciver Crouchley, Mike Dawson, Deborah Hayes, Carlos E Diez, Robert P van Dam, Sue Willis, Mabel Nava, Kristen M Hart, Michael S Cherkiss, Andrew G Crowder, Clayton Pollock, Zandy Hillis-Starr, Fernando A Muñoz Tenería, Roberto Herrera-Pavón, Vanessa Labrada-Martagón, Armando Lorences, Ana Negrete-Philippe, Margaret M Lamont, Allen M Foley, Rhonda Bailey, Raymond R Carthy, Russell Scarpino, Erin McMichael, Jane A Provancha, Annabelle Brooks, Adriana Jardim, Milagros López-Mendilaharsu, Daniel González-Paredes, Andrés Estrades, Alejandro Fallabrino, Gustavo Martínez-Souza, Gabriela M Vélez-Rubio, Ralf H Boulon, Jaime A Collazo, Robert Wershoven, Vicente Guzmán Hernández, Thomas B Stringell, Amdeep Sanghera, Peter B Richardson, Annette C Broderick, Quinton Phillips, Marta Calosso, John A B Claydon, Tasha L Metz, Amanda L Gordon, Andre M Landry, Donna J Shaver, Janice Blumenthal, Lucy Collyer, Brendan J Godley, Andrew McGowan, Matthew J Witt, Cathi L Campbell, Cynthia J Lagueux, Thomas L Bethel, Lory Kenyon
Somatic growth is an integrated, individual-based response to environmental conditions, especially in ectotherms. Growth dynamics of large, mobile animals are particularly useful as bio-indicators of environmental change at regional scales. We assembled growth rate data from throughout the West Atlantic for green turtles, Chelonia mydas, which are long-lived, highly migratory, primarily herbivorous mega-consumers that may migrate over hundreds to thousands of kilometers. Our dataset, the largest ever compiled for sea turtles, has 9690 growth increments from 30 sites from Bermuda to Uruguay from 1973 to 2015...
April 4, 2017: Global Change Biology
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