Browsing by UP Author "Valverde, Angel"

Browsing by UP Author "Valverde, Angel"

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  • Arable agriculture changes soil microbial communities in the South African Grassland Biome 
    Nkuekam, Gilbert Kamgan; Cowan, Don A.; Valverde, Angel (AOSIS Open Journals, 2018-05-30)
    Many studies, mostly in temperate regions of the northern hemisphere, have demonstrated that agricultural practices affect the composition and diversity of soil microbial communities. However, very little is known about ...
  • Biodiversity : so much more than legs and leaves 
    Cowan, Don A.; Rybicki, Edward P.; Tuffin, Marla I.; Valverde, Angel; Wingfield, Michael J. (AOSIS Open Journals, 2013-11)
    Microorganisms inhabit virtually every possible niche on Earth, including those at the outer envelope of survival. However, the focus of most conservation authorities and ecologists is the ‘legs and leaves’ side of biology ...
  • Biogeographical survey of soil microbiomes across sub-Saharan Africa : structure, drivers, and predicted climate-driven changes 
    Cowan, Don A.; Lebre, Pedro H.; Amon, C.E.R.; Becker, R.W.; Boga, H.I.; Boulange, A.; Chiyaka, T.L.; Coetzee, T.; De Jager, Pieter Christiaan; Dikinya, O.; Eckardt, F.; Greve, Michelle; Harris, Mathew Andrew; Hopkins, D.W.; Houngnandan, H.B.; Houngnandan, P.; Jordaan, K.; Kaimoyo, E.; Kambura, A.K.; Kamgan Nkuekam, Gilbert; Makhalanyane, Thulani P.; Maggs‑Kolling, G.; Marais, E.; Mondlane, H.; Nghalipo, E.; Olivier, Bernard Wilhelm; Ortiz, M.; Pertierra, Luis R.; Ramond, Jean-Baptiste; Seely, M.; Sithole‑Niang, I.; Valverde, Angel; Varliero, Gilda; Vikram, Surendra; Wall, D.H.; Zeze, A. (BMC, 2022-08-23)
    BACKGROUND : Top-soil microbiomes make a vital contribution to the Earth’s ecology and harbor an extraordinarily high biodiversity. They are also key players in many ecosystem services, particularly in arid regions of the ...
  • Biogeography of bacterial communities in hot springs : a focus on the actinobacteria 
    Valverde, Angel; Tuffin, Marla I.; Cowan, Don A. (Springer, 2012-07)
    Actinobacteria are ubiquitous in soil, freshwater and marine ecosystems. Although various studies have focused on the microbial ecology of this phylum, data are scant on the ecology of actinobacteria endemic to hot springs. ...
  • Characterization of bacterial communities in lithobionts and soil niches from Victoria Valley, Antarctica 
    Van Goethem, Marc W.; Makhalanyane, Thulani P.; Valverde, Angel; Cary, Stephen Craig; Cowan, Don A. (Oxford University Press, 2016-04)
    Here we provide the first exploration of microbial diversity from three distinct Victoria Valley edaphic habitats, namely lithobionts (hypoliths, endoliths) and surface soils. Using a combination of terminal restriction ...
  • Cyanobacteria and alphaproteobacteria may facilitate cooperative interactions in niche communities 
    Van Goethem, Marc W.; Makhalanyane, Thulani P.; Cowan, Don A.; Valverde, Angel (Frontiers Research Foundation, 2017-10-25)
    Hypoliths, microbial assemblages found below translucent rocks, provide important ecosystem services in deserts. While several studies have assessed microbial diversity of hot desert hypoliths and whether these communities ...
  • Cyanobacteria drive community composition and functionality in rock-soil interface communities 
    Valverde, Angel; Makhalanyane, Thulani P.; Seely, Mary; Cowan, Don A. (Wiley, 2015-02)
    Most ecological research on hypoliths, significant primary producers in hyperarid deserts, has focused on the diversity of individual groups of microbes (i.e. bacteria). However, microbial communities are inherently ...
  • Ecology and biogeochemistry of cyanobacteria in soils, permafrost, aquatic and cryptic polar habitats 
    Makhalanyane, Thulani P.; Valverde, Angel; Velázquez, David; Gunnigle, Eoin; Van Goethem, Marc W.; Quesada, Antonio; Cowan, Don A. (Springer, 2015-04)
    Polar Regions (continental Antarctica and the Arctic) are characterized by a range of extreme environmental conditions, which impose severe pressures on biological life. Polar cold-active cyanobacteria are uniquely adapted ...
  • Evidence for successional development in Antarctic hypolithic bacterial communities 
    Makhalanyane, Thulani P.; Valverde, Angel; Cary, Stephen Craig; Birkeland, Nils-Kare; Tuffin, Marla I.; Cowan, Don A. (Nature Publishing Group, 2013-11)
    Hypoliths (cryptic microbial assemblages that develop on the undersides of translucent rocks) are significant contributors to regional C and N budgets in both hot and cold deserts. Previous studies in the Dry Valleys ...
  • Evidence of species recruitment and development of hot desert hypolithic communities 
    Valverde, Angel; Tuffin, Marla I.; Cowan, Don A.; Lacap, Donnabella C.; Pointing, Stephen B. (Environmental Microbiology Reports, 2013-04)
    Hypoliths, photosynthetic microbial assemblages found underneath translucent rocks, are widely distributed within the western region of the Namib Desert and other similar environments. Terminal restriction fragment length ...
  • The functional potential of the rhizospheric microbiome of an invasive tree species, Acacia dealbata 
    Kamutando, Casper N.; Vikram, Surendra; Makhalanyane, Thulani P.; Greve, Michelle; Le Roux, Johannes J.; Richardson, David M.; Cowan, Don A.; Valverde, Angel (Springer, 2019-01)
    Plant-microbe interactions mediate both the invasiveness of introduced plant species and the impacts that they have in invaded ecosystems. Although the phylogenetic composition of the rhizospheric microbiome of Acacia ...
  • Habitat heterogeneity and connectivity shape microbial communities in South American peatlands 
    Oloo, Felix; Valverde, Angel; Quiroga, Maria Victoria; Vikram, Surendra; Cowan, Don A.; Mataloni, Gabriela (Nature Publishing Group, 2016-05-10)
    Bacteria play critical roles in peatland ecosystems. However, very little is known of how habitat heterogeneity affects the structure of the bacterial communities in these ecosystems. Here, we used amplicon sequencing ...
  • Hypolithic and soil microbial community assembly along an aridity gradient in the Namib Desert 
    Stomeo, Francesca; Valverde, Angel; Pointing, Stephen B.; McKay, Christopher P.; Warren-Rhodes, Kimberley A.; Tuffin, Marla I.; Seely, Mary; Cowan, Don A. (Springer, 2013-02-09)
    The Namib Desert is considered the oldest desert in the world and hyperarid for the last 5 million years. However, the environmental buffering provided by quartz and other translucent rocks supports extensive hypolithic ...
  • Key microbial taxa in the rhizosphere of sorghum and sunflower grown in crop rotation 
    Oberholster, Tanzelle; Vikram, Surendra; Cowan, Don A.; Valverde, Angel (Elsevier, 2018-05)
    Microbes are key determinants of plant health and productivity. Previous studies have characterized the rhizosphere microbiomes of numerous plant species, but little information is available on how rhizosphere microbial ...
  • Micro-eukaryotic diversity in hypolithons from Miers Valley, Antarctica 
    Gokul, Jarishma K.; Valverde, Angel; Tuffin, Marla I.; Cary, Stephen Craig; Cowan, Don A. (MDPI online quarterly, 2013-02-22)
    The discovery of extensive and complex hypolithic communities in both cold and hot deserts has raised many questions regarding their ecology, biodiversity and relevance in terms of regional productivity. However, most ...
  • Microbial ecology of hot desert edaphic systems 
    Makhalanyane, Thulani P.; Valverde, Angel; Gunnigle, Eoin; Frossard, Aline; Ramond, Jean-Baptiste; Cowan, Don A. (Oxford University Press, 2015-03)
    A significant proportion of the Earth's surface is desert or in the process of desertification. The extreme environmental conditions that characterize these areas result in a surface that is essentially barren, with a ...
  • Plants of the fynbos biome harbour host species-specific bacterial communities 
    Miyambo, Tsakani Magdeline; Makhalanyane, Thulani P.; Cowan, Don A.; Valverde, Angel (Oxford University Press, 2016-08)
    The fynbos biome in South Africa is globally recognised as a plant biodiversity hotspot. However, very little is known about the bacterial communities associated with fynbos plants, despite interactions between primary ...
  • Pollution shapes the microbial communities in river water and sediments from the Olifants River catchment, South Africa 
    Valverde, Angel; Cason, Errol D.; Gomez-Arias, Alba; Bozkale, Derya; Govender, Danny; Riddell, Eddie; Cowan, Don A. (Springer, 2021-01)
    Human activities such as agriculture and mining are leading causes of water pollution worldwide. Individual contaminants are known to negatively affect microbial communities. However, the effect of multifaceted pollution ...
  • Soil nutritional status and biogeography influence rhizosphere microbial communities associated with the invasive tree Acacia dealbata 
    Kamutando, Casper N.; Vikram, Surendra; Kamgan-Nkuekam, Gilbert; Makhalanyane, Thulani P.; Greve, Michelle; Le Roux, Johannes J.; Richardson, David M.; Cowan, Don A.; Valverde, Angel (Nature Publishing Group, 2017-07-26)
    Invasiveness and the impacts of introduced plants are known to be mediated by plant-microbe interactions. Yet, the microbial communities associated with invasive plants are generally poorly understood. Here we report on ...
  • Specific microbial communities associate with the rhizosphere of Welwitschia mirabilis, a living fossil 
    Valverde, Angel; De Maayer, Pieter; Oberholster, Tanzelle; Henschel, Joh; Louw, Michele K.; Cowan, Don A. (Public Library of Science, 2016-04-11)
    Welwitschia mirabilis is an ancient and rare plant distributed along the western coast of Namibia and Angola. Several aspects of Welwitschia biology and ecology have been investigated, but very little is known about the ...