Microbial Communities in the Fynbos Region of South Africa: What Happens during Woody Alien Plant Invasions

Jacobs, Karin; Conradie, Tersia; Jacobs, Shayne M.

doi:10.3390/d12060254

Cited by 8 publications

(5 citation statements)

References 127 publications

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“…It is well known that alien plants may become a potential threat and cause damage to ecosystems [58,59], while in the present study, we found that nonnative plant populations may impact the microbial community and function of water bodies. Invasive plants have previously been found in terrestrial ecosystems to affect soil chemistry and microbial communities [60], but they have rarely been reported before in aquatic ecosystems. Alien organisms may change local microbial communities by affecting the properties of local conditions [61,62] and altering the phyllospheric and rhizosphere microbial characteristics [63][64][65].…”

Section: Discussionmentioning

confidence: 99%

Abiotic and Biotic Effects on Microbial Diversity of Small Water Bodies in and around Towns

Peng

2023

Sustainability

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Microbial communities play very important roles in pollutant treatment and absorption and material and energy cycling in wetlands. Among different wetland types, wetlands in and around towns are the most closely related to human life, but how human activities affect microbes in small water bodies has received little attention. In this study, nine small water bodies of three different landscape types were chosen in the Lishui District of Nanjing City, China. The microbial community characteristics of four different seasons were revealed by metagenomics in 2021, and the possible effects of abiotic and biological factors such as the effects of alien organisms on microbial communities were analyzed. The results showed significant differences in microbial community structure in different seasons and habitats. Abiotic and biological factors jointly affected the microbial communities, and the influence of water quality was greater than that of the habitat type and biological factors. This study shows that in addition to the water quality, the wetland biome structure, especially the abundance of alien species, may have an impact on microbial communities. The results emphasize that human activities such as land use and the introduction of alien species have significant impacts on the ecosystem structure and function.

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Section: Discussionmentioning

confidence: 99%

Abiotic and Biotic Effects on Microbial Diversity of Small Water Bodies in and around Towns

Peng

2023

Sustainability

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“…The microbial community structure in the fynbos is rather complex and includes bacteria, fungi and archaea. These microbes play a vital role in supporting plant growth in the acidic, nutrient-poor soils of the fynbos [ 28 , 31 ]. This study was conducted to ascertain any changes in microbial community structure during wet and dry seasons, and the results showed that the phylum Actinobacteria was very dominant (≥30%) in the rhizosphere of Polhillia , Wiborgia and Wiborgiella species during both wet and dry seasons.…”

Section: Discussionmentioning

confidence: 99%

“…Studies of microbial community structure associated with endemic plant species in the Cape fynbos [ 6 , 25 , 26 , 27 , 28 ] have revealed high microbial diversity belowground, similar to aboveground plant species diversity. Microbial diversity can however be altered by many factors, including soil pH, plant species/type, plant age, cultivation history, as well as growth season [ 6 , 25 , 26 , 27 , 28 ]. The rhizosphere of legumes in the fynbos can therefore differ from plant to plant and species to species during different seasons.…”

Section: Introductionmentioning

confidence: 99%

Seasonal Effect on Bacterial Communities Associated with the Rhizospheres of Polhillia, Wiborgia and Wiborgiella Species in the Cape Fynbos, South Africa

Mpai

Jaiswal²,

Cupido³

et al. 2022

Microorganisms

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The Cape fynbos biome in South Africa is home to highly diverse and endemic shrub legumes, which include species of Aspalathus, Polhillia, Wiborgia and Wiborgiella. These species play a significant role in improving soil fertility due to their ability to fix N2. However, information regarding their microbiome is still unknown. Using the 16S rRNA Miseq illumina sequencing, this study assessed the bacterial community structure associated with the rhizospheres of Polhillia pallens, Polhillia brevicalyx, Wiborgia obcordata, Wiborgia sericea and Wiborgiella sessilifolia growing at different locations during the wet and dry seasons in the Cape fynbos. The results showed that the most dominant bacterial phylum was Actinobacteria during both the dry (56.2–37.2%) and wet (46.3–33.3%) seasons. Unclassified bacterial genera (19.9–27.7%) were the largest inhabitants in the rhizospheres of all five species during the two seasons. The other dominant phyla included Bacteroidetes, Acidobacteria, Proteobacteria and Firmicutes. Mycobacterium and Conexibacter genera were the biggest populations found in the rhizosphere soil of all five test species during both seasons, except for W. obcordata soil sampled during the dry season, which had Dehalogenimonas as the major inhabitant (6.08%). In this study plant species and growth season were the major drivers of microbial community structure, with W. obcordata having the greatest influence on its microbiome than the other test species. The wet season promoted greater microbial diversity than the dry season.

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“…Furthermore, the species can establish a symbiotic partnership with many soil arbuscular mycorrhizal fungi (AMF). These fungal symbionts are the most widespread on the surface of the globe and adapted to many environments and different host plants (Vaishnav et al, 2017;Jacobs et al, 2020); they can form mutualistic associations with the roots of about 80% of terrestrial plants (Smith and read 2008). Golden wreath wattle (A. cyanophylla Lindl or A. saligna Labill) is a species native to the temperate region of southwestern Australia, where it has a naturally widespread distribution (Millar and Byrne, 2012) in various habitats, especially on soils with a high proportion of sand, such as dunes, sandy plains, or rocky ridges where it forms open forests (Griffin et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Effects of Dual Symbiotic Interactions Performed by the Exotic Tree Golden Wreath Wattle (Acacia cyanophylla Lindl.) on Soil Fertility in a Costal Sand Dune Ecosystem

Dounas

Bourhia²,

Outamamat³

et al. 2022

Front. Environ. Sci.

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The present study aims to evaluate the effects of the exotic shrub Acacia cyanophylla Lindl. on soil fertility by studying 1) its ability to modify the soil physicochemical composition, 2) its contribution to the soil mycorrhizal potential and its impact on the richness and diversity of the arbuscular mycorrhizal fungi (AMF) community in the rhizospheric soil (RS), and finally 3) its atmospheric nitrogen fixation potential. The physicochemical analysis of the RS has shown that soil invasion by A. cyanophylla has a beneficial effect on its fertility; this advantage is demonstrated by the increase of the organic matter and the nutrient contents (N, P, K, Na, Ca) in the RS. Furthermore, the roots of this shrub exhibited broad AMF colonization, which confirms its high mycotrophic aspect. Four differentiated morphotypes of mycorrhizal spores were isolated from the RS of A. cyanophylla by use of the wet sieving method. In addition, the most probable number method showed that A. cyanophylla was capable of dramatically increasing the mycorrhizal potential of the soil. Indeed, more than 1,213 infectious propagules per one hundred grams of soil were detected in the RS of A. cyanophylla. Moreover, A. cyanophylla roots showed a significant presence of nodules indicating an active atmospheric nitrogen fixation. Counting revealed the presence of at least 130 nodules in the root fragments contained in 1 kg of soil. In conclusion, the biological invasion of sand dunes by the exotic shrub A. cyanophylla exhibited beneficial effects on the soil’s chemical composition and functioning, the activity of rhizobacteria in fixing atmospheric nitrogen, and phosphate bioavailability under the action of the native AMF community.

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Microbial Communities in the Fynbos Region of South Africa: What Happens during Woody Alien Plant Invasions

Cited by 8 publications

References 127 publications

Abiotic and Biotic Effects on Microbial Diversity of Small Water Bodies in and around Towns

Abiotic and Biotic Effects on Microbial Diversity of Small Water Bodies in and around Towns

Seasonal Effect on Bacterial Communities Associated with the Rhizospheres of Polhillia, Wiborgia and Wiborgiella Species in the Cape Fynbos, South Africa

Effects of Dual Symbiotic Interactions Performed by the Exotic Tree Golden Wreath Wattle (Acacia cyanophylla Lindl.) on Soil Fertility in a Costal Sand Dune Ecosystem

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