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  • Open Access


    Diversity of Saxicolous Lichens along an Aridity Gradient in Central México

    José Carmen Soto-Correa1, Abraham Saldaña-Vega1, Víctor Hugo Cambrón-Sandoval1, Laura Concostrina-Zubiri2, Mariela Gómez-Romero3,*

    Phyton-International Journal of Experimental Botany, Vol.91, No.4, pp. 827-840, 2022, DOI:10.32604/phyton.2022.017929

    Abstract Lichens are symbiotic organisms that comprise a fungus and a photosynthetic partner wich are recognized as a good indicator of climate change. However, our understanding of how aridity affects the diversity of saxicolous lichens in drylands is still limited. To evaluate the relationship between saxicolous lichen diversity and aridity in a central México dryland, a geographical transect was established of 100 km to build an aridity gradient in the semiarid zone of the State of Querétaro, Mexico, comprising ten sampling sites with a 10 km separation. Species richness, abundance and diversity of soil lichen species were recorded using two sampling methods: the… More >

  • Open Access


    CDLSTM: A Novel Model for Climate Change Forecasting

    Mohd Anul Haq*

    CMC-Computers, Materials & Continua, Vol.71, No.2, pp. 2363-2381, 2022, DOI:10.32604/cmc.2022.023059

    Abstract Water received in rainfall is a crucial natural resource for agriculture, the hydrological cycle, and municipal purposes. The changing rainfall pattern is an essential aspect of assessing the impact of climate change on water resources planning and management. Climate change affected the entire world, specifically India’s fragile Himalayan mountain region, which has high significance due to being a climatic indicator. The water coming from Himalayan rivers is essential for 1.4 billion people living downstream. Earlier studies either modeled temperature or rainfall for the Himalayan area; however, the combined influence of both in a long-term analysis was not performed utilizing Deep… More >

  • Open Access


    Oxidative metabolism of photosynthetic species and the exposure to some freshwater and marine biotoxins


    BIOCELL, Vol.45, No.4, pp. 813-821, 2021, DOI:10.32604/biocell.2021.015360

    Abstract Environmental climate conditions could lead to an increasing global occurrence of microorganism blooms that synthesize toxins in the aquatic environments. These blooms could result in significantly toxic events. Responses of photosynthetic organisms to adverse environmental conditions implicate reactive oxygen species generation; but, due to the presence of a varied cellular antioxidant defense system and complex signaling networks, this oxidative stress could act as an important factor in the environmental adaptive processes. The objective of this review was to assess how some biotoxins are implicated in the generation of oxidative and nitrosative metabolic changes, not only in biotoxin-producing organisms but also… More >

  • Open Access


    Changes of the Flowering Time of Trees in Spring by Climate Change in Seoul, South Korea

    Hyewon Kim1, Chanwoo Park2, Jong Hwan Lim2, Hye Woo Shin3,*

    Phyton-International Journal of Experimental Botany, Vol.89, No.4, pp. 1019-1033, 2020, DOI:10.32604/phyton.2020.010649

    Abstract Flowering onset has attracted much attention in ecological research as an important indicator of climate change. Generally, warmer temperatures advance flowering onset. The effect of climate warming on flowering onset is more pronounced in spring because the difference between atmospheric and water temperatures creates more rapid convection than in other seasons. We analyzed the correlation between 73 species of spring woody plants in Hongneung Arboretum in Seoul, South Korea and the spring minimum temperature and average precipitation over the past 50 years (1968–2018). The spring minimum temperature and average precipitation have increased over the past 50 years, resulting in the… More >

  • Open Access


    The Challenge of the Paris Agreement to Contain Climate Change

    E. Grigoroudis, F. Kanellos, V. S. Kouikoglou, Y. A. Phillis

    Intelligent Automation & Soft Computing, Vol.24, No.2, pp. 319-330, 2018, DOI:10.1080/10798587.2017.1292716

    Abstract Climate change due to anthropogenic CO2 and other greenhouse gas emissions has had and will continue to have widespread negative impacts on human society and natural ecosystems. Drastic and concerted actions should be undertaken immediately if such impacts are to be prevented. The Paris Agreement on climate change aims to limit global mean temperature below 2 °C compared to the pre-industrial level. Using simulation and optimization tools and the most recent data, this paper investigates optimal emissions policies satisfying certain temperature constraints. The results show that only if we consider negative emissions coupled with drastic emissions reductions, temperature could be stabilized… More >

  • Open Access


    Carbon concentration in structures of Arctostaphylos pungens HBK: An alternative CO2 sink in forests

    Pompa-García M1, E Jurado2

    Phyton-International Journal of Experimental Botany, Vol.84, No.2, pp. 385-389, 2015, DOI:10.32604/phyton.2015.84.385

    Abstract Arctostaphylos pungens HBK is a dominant species with increasing abundance and distribution in chaparral ecosystems as a result of range management and, possibly, changes in climate. The value of this species for carbon (C) sequestration is unknown, and the standard 50% C out of total tree biomass is used as an approximate value. In this study, we aim to determine the C concentration of the primary components of A. pungens. The total C expressed as a percentage of biomass was determined with a Solids TOC Analyzer. We found the C concentration to vary among components. Leaves exhibited the highest C… More >

  • Open Access


    Oxidative stress in Microcystis aeruginosa as a consequence of global climate change

    Marcelo HERNANDO1, Christian HOUGHTON1, Leda GIANNUZZI2, Bernd KROCK3, Darío ANDRINOLO2, Gabriela MALANGA4,*

    BIOCELL, Vol.40, No.1, pp. 23-26, 2016, DOI:10.32604/biocell.2016.40.023

    Abstract Cyanobacteria are phototrophic organisms with great ecological and economical importance. Species of the genus Microcystis are known for their potential ability to synthesize toxins, notably microcystins. There is a growing interest in the evaluation of oxidative stress in relation to the impact of global climate change on natural ecosystems in different trophic levels. Several studies have focused on the analysis of organismal responses to mitigate the damage by controlling the generation of reactive oxygen species. Variations in environmental factors caused by climate change generate a situation of oxidative damage in Microcystis aeruginosa as a direct or indirect consequence. In this… More >

  • Open Access


    Experimental evidence of soil bacteria abundance as the primary driver of rhizosphere priming effect

    Ma YP1,2,3#, ZJ Zhang1,2#, TQ Su1#, CA Busso4, ER Johnston5, XG Han1,6, XM Zhang2*

    Phyton-International Journal of Experimental Botany, Vol.87, pp. 286-291, 2018, DOI:10.32604/phyton.2018.87.286

    Abstract Soil microbial communities are thought to be responsible for the rhizosphere priming effect (RPE). However, because soil microbial communities are comprised of diverse components, very little is known about which component plays the critical role. In this study, soybean and cottonwood were grown at two latitudinal locations with different temperature and light conditions in-situ. We quantified RPE using a natural δ13C method, and measured the abundance, richness and composition of bacteria and fungi communities with DNA-based molecular methods. Among all potential variables, including the three aforementioned indexes of bacteria and fungi communities and soil physicochemical and plant indexes, bacterial abundance… More >

  • Open Access


    Responses of leaf δ13C and leaf traits to precipitation and temperature in arid ecosystem of northwestern China

    Xin ZM1,2, MH Liu2, Q Lu1,3, CA Busso5, YJ Zhu1,3, Z Li2, YR Huang2, XL Li2, FM Luo2, F Bao1, JQ Qian4*, YH Li1,3*

    Phyton-International Journal of Experimental Botany, Vol.87, pp. 144-155, 2018, DOI:10.32604/phyton.2018.87.144

    Abstract Leaf δ13C is widely used to explain plant strategies related to resource availability in different environments. However, the coupled response of leaf δ13C to precipitation and temperature as well as the relationship between leaf δ13C and leaf traits remain unclear. The leaf δ13C and its relationship with leaf traits [leaf size (LS), leaf length (LL), leaf width (LW), leaf length to width ratio (L:W), specific leaf area (SLA) and mass-based leaf nitrogen concentration (Nmass)] were investigated on the dominant shrub species Nitraria tangutorum Bobr. in the arid region (Dengkou and Minqin) of northwestern China under the simulated increasing precipitation (PGS)… More >

  • Open Access


    The Application of BP Neural Networks to Analysis the National Vulnerability

    Guodong Zhao1, Yuewei Zhang1, Yiqi Shi2, Haiyan Lan1,*, Qing Yang3

    CMC-Computers, Materials & Continua, Vol.58, No.2, pp. 421-436, 2019, DOI:10.32604/cmc.2019.03782

    Abstract Climate change is the main factor affecting the country’s vulnerability, meanwhile, it is also a complicated and nonlinear dynamic system. In order to solve this complex problem, this paper first uses the analytic hierarchy process (AHP) and natural breakpoint method (NBM) to implement an AHP-NBM comprehensive evaluation model to assess the national vulnerability. By using ArcGIS, national vulnerability scores are classified and the country’s vulnerability is divided into three levels: fragile, vulnerable, and stable. Then, a BP neural network prediction model which is based on multivariate linear regression is used to predict the critical point of vulnerability. The function of… More >

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