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Terrestrial productivity

Jasmine S Berg, Dolma Michellod, Petra Pjevac, Clara Martinez-Perez, Caroline R T Buckner, Philipp F Hach, Carsten J Schubert, Jana Milucka, Marcel M M Kuypers
Iron redox reactions play an important role in carbon remineralization, supporting large microbial communities in iron-rich terrestrial and aquatic sediments. Stratified water columns with comparably low iron concentrations are globally widespread, but microbial iron cycling in these systems has largely been ignored. We found evidence for unexpectedly high iron turnover rates in the low (1-2 µmol·l(-1) ) iron waters of Lake Cadagno. Light-dependent, biological iron oxidation rates (1.4-13.8 µmol·l(-1) ·d(-1) ) were even higher than in ferruginous lakes with well-studied microbial iron cycles...
October 21, 2016: Environmental Microbiology
Ji-Feng Yang, Li-Ming Yang, Guang-Guo Ying, Cheng-Bin Liu, Li-Ying Zheng, Sheng-Lian Luo
Sulfonamide antibiotics are often detected in terrestrial and aquatic environment, but little is known about abiotic degradation of these antibiotics. In the present study, the degradation of the sulfonamide antibiotic sulfadiazine by a synthesized δ-MnO2 was investigated. The initial reaction rate of sulfadiazine oxidized by manganese dioxide increased as the solution pH decreased by weakening electrostatic attraction between sulfadiazine and MnO2 and enhancing the reduction potential of MnO2. The presence of metal ions (Mn(2+), Na(+) and Ca(2+)), especially Mn(2+), decreased the initial reaction rate by competitively adsorbing and reacting with MnO2...
October 21, 2016: Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering
Abdolbaset Ghorbani, Barbara Gravendeel, Sugirthini Selliah, Shahin Zarré, Hugo de Boer
Tubers of terrestrial orchids are harvested and traded from the eastern Mediterranean to the Caspian Sea for the traditional product Salep. Over-exploitation of wild populations and increased middle-class prosperity have escalated prices for Salep, causing overharvesting, depletion of native populations and providing an incentive to expand harvesting to untapped areas in Iran. Limited morphological distinctiveness among traded Salep tubers renders species identification impossible, making it difficult to establish which species are targeted and affected the most...
October 21, 2016: Molecular Ecology Resources
Sebastian Sippel, Holger Lange, Miguel D Mahecha, Michael Hauhs, Paul Bodesheim, Thomas Kaminski, Fabian Gans, Osvaldo A Rosso
Data analysis and model-data comparisons in the environmental sciences require diagnostic measures that quantify time series dynamics and structure, and are robust to noise in observational data. This paper investigates the temporal dynamics of environmental time series using measures quantifying their information content and complexity. The measures are used to classify natural processes on one hand, and to compare models with observations on the other. The present analysis focuses on the global carbon cycle as an area of research in which model-data integration and comparisons are key to improving our understanding of natural phenomena...
2016: PloS One
Atsushi Kubo, Jota Kanda
Total organic carbon (TOC), total nitrogen (TN) contents, their stable C and N isotope ratio (δ(13)C and δ(15)N), and chlorophyll a ([Chl a]sed) of surface sediments were investigated monthly to identify the seasonal variations and sources of organic matter in Tokyo Bay. The sedimentary TOC (TOCsed) and TN (TNsed) contents, and the sedimentary δ(13)C and δ(15)N (δ(13)Csed and δ(15)Nsed) values were higher in summer than other seasons. The seasonal variations were controlled by high primary production in the water column and hypoxic water in the bottom water during summer...
October 16, 2016: Marine Pollution Bulletin
Leslie L Muggelberg, Kara E Huff Hartz, Samuel A Nutile, Amanda D Harwood, Jennifer R Heim, Andrew P Derby, Donald P Weston, Michael J Lydy
The recent discovery of pyrethroid-resistant Hyalella azteca populations in California, USA suggests there has been significant exposure of aquatic organisms to these terrestrially-applied insecticides. Since resistant organisms are able to survive in relatively contaminated habitats they may experience greater pyrethroid bioaccumulation, subsequently increasing the risk of those compounds transferring to predators. These issues were evaluated in the current study following toxicity tests in water with permethrin which showed the 96-h LC50 of resistant H...
October 15, 2016: Environmental Pollution
Guohua Shi, Changhui Peng, Meng Wang, Shengwei Shi, Yanzheng Yang, Junyao Chu, Junjun Zhang, Guanghui Lin, Yan Shen, Qiuan Zhu
The lateral transport of dissolved organic carbon (DOC) plays an important role in linking the carbon cycles of terrestrial and aquatic ecosystems. Neglecting the lateral flow of dissolved organic carbon can lead to an underestimation of the organic carbon budget of terrestrial ecosystems. It is thus necessary to integrate DOC concentrations and flux into carbon cycle models, particularly with regard to the development of models that are intended to directly link terrestrial and ocean carbon cycles. However, to achieve this goal, more accurate information is needed to better understand and predict DOC dynamics...
2016: PloS One
Julien Soubrier, Graham Gower, Kefei Chen, Stephen M Richards, Bastien Llamas, Kieren J Mitchell, Simon Y W Ho, Pavel Kosintsev, Michael S Y Lee, Gennady Baryshnikov, Ruth Bollongino, Pere Bover, Joachim Burger, David Chivall, Evelyne Crégut-Bonnoure, Jared E Decker, Vladimir B Doronichev, Katerina Douka, Damien A Fordham, Federica Fontana, Carole Fritz, Jan Glimmerveen, Liubov V Golovanova, Colin Groves, Antonio Guerreschi, Wolfgang Haak, Tom Higham, Emilia Hofman-Kamińska, Alexander Immel, Marie-Anne Julien, Johannes Krause, Oleksandra Krotova, Frauke Langbein, Greger Larson, Adam Rohrlach, Amelie Scheu, Robert D Schnabel, Jeremy F Taylor, Małgorzata Tokarska, Gilles Tosello, Johannes van der Plicht, Ayla van Loenen, Jean-Denis Vigne, Oliver Wooley, Ludovic Orlando, Rafał Kowalczyk, Beth Shapiro, Alan Cooper
The two living species of bison (European and American) are among the few terrestrial megafauna to have survived the late Pleistocene extinctions. Despite the extensive bovid fossil record in Eurasia, the evolutionary history of the European bison (or wisent, Bison bonasus) before the Holocene (<11.7 thousand years ago (kya)) remains a mystery. We use complete ancient mitochondrial genomes and genome-wide nuclear DNA surveys to reveal that the wisent is the product of hybridization between the extinct steppe bison (Bison priscus) and ancestors of modern cattle (aurochs, Bos primigenius) before 120 kya, and contains up to 10% aurochs genomic ancestry...
October 18, 2016: Nature Communications
Elisabeth Richter, Silvia Berkner, Ina Ebert, Bernhard Förster, Nadin Graf, Monika Herrchen, Ute Kühnen, Jörg Römbke, Markus Simon
BACKGROUND: Residues of veterinary medicinal products (VMPs) enter the environment via application of manure onto agricultural areas where in particular antibiotics can cause phytotoxicity. Terrestrial plant tests according to OECD guideline 208 are part of the environmental risk assessment of VMPs. However, this standard approach might not be appropriate for VMPs which form non-extractable residues or transformation products in manure and manure-amended soil. Therefore, a new test design with a more realistic exposure scenario via manure application is needed...
2016: Environmental Sciences Europe
Karen Duis, Anja Coors
Due to the widespread use and durability of synthetic polymers, plastic debris occurs in the environment worldwide. In the present work, information on sources and fate of microplastic particles in the aquatic and terrestrial environment, and on their uptake and effects, mainly in aquatic organisms, is reviewed. Microplastics in the environment originate from a variety of sources. Quantitative information on the relevance of these sources is generally lacking, but first estimates indicate that abrasion and fragmentation of larger plastic items and materials containing synthetic polymers are likely to be most relevant...
2016: Environmental Sciences Europe
Dennis Baldocchi, Youngryel Ryu, Trevor Keenan
A growing literature is reporting on how the terrestrial carbon cycle is experiencing year-to-year variability because of climate anomalies and trends caused by global change. As CO 2 concentration records in the atmosphere exceed 50 years and as satellite records reach over 30 years in length, we are becoming better able to address carbon cycle variability and trends. Here we review how variable the carbon cycle is, how large the trends in its gross and net fluxes are, and how well the signal can be separated from noise...
2016: F1000Research
Xiaojia He, Donee' McAlliser, Winfred G Aker, Huey-Min Hwang
Titanium dioxide nanoparticles (TiO2 NPs) are among the most widely manufactured nanomaterials on a global scale. However, prudent and vigilant surveillance, incumbent upon the scientific community with the advent of new technologies, has revealed potentially undesirable effects of TiO2 NPs on biological systems and the natural environment during their application and discharge. Such effects are likely best evaluated by first assessing the fate of the TiO2 NPs in natural environments. In this study, the effects of terrestrial humic acid (HA) and tannic acid (TA), two major members of the collective: dissolved organic matter (DOM), on the cytotoxicity of TiO2 NPs to Escherichia coli were investigated in the presence and absence of natural sunlight...
October 2016: Journal of Environmental Sciences (China)
Figen Sisman Nayal, Aydin Mammadov, Nilgun Ciliz
While Turkey is one of the world's largest producers and exporters of agricultural goods, it is also, at the same time a net importer of energy carriers. This dichotomy offers a strong incentive to generate energy from agricultural and farming waste; something which could provide energy security for rural areas. Combined with the enhanced energy security for farming areas, the production of energy in this manner could conceivably contribute to the overall national effort to reduce the Turkey's carbon footprint...
October 11, 2016: Journal of Environmental Management
Maarten Schrama, Fons van der Plas, Matty P Berg, Han Olff
1.Terrestrial ecosystems are characterised by a strong functional connection between the green (plant-herbivore-based) and brown (detritus-detritivore-based) parts of the food web, which both develop over successional time. However, the interlinked changes in green and brown food web diversity patterns in relation to key ecosystem processes are rarely studied. 2.Here, we demonstrate changes in species richness, diversity and evenness over a wide range of invertebrate green and brown trophic groups during 100 years of primary succession in a salt marsh ecosystem, using a well-calibrated chronosequence...
October 14, 2016: Journal of Animal Ecology
Jingjing Liang, Thomas W Crowther, Nicolas Picard, Susan Wiser, Mo Zhou, Giorgio Alberti, Ernst-Detlef Schulze, A David McGuire, Fabio Bozzato, Hans Pretzsch, Sergio de-Miguel, Alain Paquette, Bruno Hérault, Michael Scherer-Lorenzen, Christopher B Barrett, Henry B Glick, Geerten M Hengeveld, Gert-Jan Nabuurs, Sebastian Pfautsch, Helder Viana, Alexander C Vibrans, Christian Ammer, Peter Schall, David Verbyla, Nadja Tchebakova, Markus Fischer, James V Watson, Han Y H Chen, Xiangdong Lei, Mart-Jan Schelhaas, Huicui Lu, Damiano Gianelle, Elena I Parfenova, Christian Salas, Eungul Lee, Boknam Lee, Hyun Seok Kim, Helge Bruelheide, David A Coomes, Daniel Piotto, Terry Sunderland, Bernhard Schmid, Sylvie Gourlet-Fleury, Bonaventure Sonké, Rebecca Tavani, Jun Zhu, Susanne Brandl, Jordi Vayreda, Fumiaki Kitahara, Eric B Searle, Victor J Neldner, Michael R Ngugi, Christopher Baraloto, Lorenzo Frizzera, Radomir Bałazy, Jacek Oleksyn, Tomasz Zawiła-Niedźwiecki, Olivier Bouriaud, Filippo Bussotti, Leena Finér, Bogdan Jaroszewicz, Tommaso Jucker, Fernando Valladares, Andrzej M Jagodzinski, Pablo L Peri, Christelle Gonmadje, William Marthy, Timothy O'Brien, Emanuel H Martin, Andrew R Marshall, Francesco Rovero, Robert Bitariho, Pascal A Niklaus, Patricia Alvarez-Loayza, Nurdin Chamuya, Renato Valencia, Frédéric Mortier, Verginia Wortel, Nestor L Engone-Obiang, Leandro V Ferreira, David E Odeke, Rodolfo M Vasquez, Simon L Lewis, Peter B Reich
The biodiversity-productivity relationship (BPR) is foundational to our understanding of the global extinction crisis and its impacts on ecosystem functioning. Understanding BPR is critical for the accurate valuation and effective conservation of biodiversity. Using ground-sourced data from 777,126 permanent plots, spanning 44 countries and most terrestrial biomes, we reveal a globally consistent positive concave-down BPR, showing that continued biodiversity loss would result in an accelerating decline in forest productivity worldwide...
October 14, 2016: Science
Paran Gani, Norshuhaila Mohamed Sunar, Hazel Matias-Peralta, Ab Aziz Abdul Latiff, Siti Fatimah Zaharah Mohamad Fuzi
Microalgae biomass has been recognised as a sustainable bio-product to replace terrestrial biomass in biofuel production. The microalgae industry has high operating costs, specifically on harvesting and biomass recovery. Therefore, the development of an efficient harvesting method is crucial to the minimisation of production cost. A statistical analysis via response surface methodology was used to investigate the optimisation of harvesting efficiency using alum and chitosan as a coagulant. Growth rate and biomass productivity were also determined...
October 13, 2016: Preparative Biochemistry & Biotechnology
Liang Xu, Zhen-Feng Zhou
Physiological integration can enhance the performance of clonal plants in aquatic and terrestrial heterogeneous habitats and associated ecotones. Similar to nutrients, pollutants may be transported among connected ramets via physiological integration. Few studies have examined the expansion of amphibious clonal plants from terrestrial to aquatic environments, particularly when the local water supply is polluted with heavy metals. A greenhouse experiment was conducted using the amphibious plant Alternanthera philoxeroides to determine whether Cu can spread among clonal plants and examine the corresponding effects of this pollution on the expansion of clonal plants in aquatic-terrestrial ecotones...
2016: PloS One
Khalid Rehman Hakeem, Muhammad Sabir, Munir Ozturk, Mohd Sayeed Akhtar, Faridah Hanum Ibrahim, Muhammad Ashraf, Muhammad Sajid Aqeel Ahmad
Increased use of nitrogenous (N) fertilizers in agriculture has significantly altered the global N-cycle because they release nitrogenous gases of environmental concerns. The emission of nitrous oxide (N2O) contributes to the global greenhouse gas accumulation and the stratospheric ozone depletion. In addition, it causes nitrate leaching problem deteriorating ground water quality. The nitrate toxicity has been reported in a number of studies showing the health hazards like methemoglobinemia in infants and is a potent cause of cancer...
October 13, 2016: Reviews of Environmental Contamination and Toxicology
Kathleen McDonough, Kenneth Casteel, Ann Zoller, Kenneth Wehmeyer, Etje Hulzebos, Jean-Paul Rila, Daniel Salvito, Thomas Federle
OTNE [1-(1,2,3,4,5,6,7,8-octahydro-2,3,8,8-tetramethyl-2-naphthyl)ethan-1-one; trade name Iso E Super] is a fragrance ingredient commonly used in consumer products which are disposed down the drain. This research measured effluent and sludge concentrations of OTNE at 44 US wastewater treatment plants (WWTP). The mean effluent and sludge concentrations were 0.69 ± 0.65 μg/L and 20.6 ± 33.8 mg/kg dw respectively. Distribution of OTNE effluent concentrations and dilution factors were used to predict surface water and sediment concentrations and distributions of OTNE sludge concentrations and loading rates were used to predict terrestrial concentrations...
October 8, 2016: Chemosphere
Michael Jacques Lathuillière, Cecile Bulle, Mark S Johnson
The incorporation of soil moisture regenerated by precipitation, or green water, into life cycle assessment has been of growing interest given the global importance of this resource for terrestrial ecosystems and food production. This paper proposes a new impact assessment model to relate land and water use in seasonally dry, semi-arid, and arid regions where precipitation and evapotranspiration are closely coupled. We introduce the Precipitation Reduction Potential mid-point impact representing the change in downwind precipitation as a result of a land transformation and occupation activity...
October 7, 2016: Environmental Science & Technology
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