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Quiroga MV, Stegen JC, Mataloni G, Cowan D, Lebre PH, Valverde A. Microdiverse bacterial clades prevail across Antarctic wetlands. Mol Ecol 2024; 33:e17189. [PMID: 37909659 DOI: 10.1111/mec.17189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Revised: 10/06/2023] [Accepted: 10/16/2023] [Indexed: 11/03/2023]
Abstract
Antarctica's extreme environmental conditions impose selection pressures on microbial communities. Indeed, a previous study revealed that bacterial assemblages at the Cierva Point Wetland Complex (CPWC) are shaped by strong homogeneous selection. Yet which bacterial phylogenetic clades are shaped by selection processes and their ecological strategies to thrive in such extreme conditions remain unknown. Here, we applied the phyloscore and feature-level βNTI indexes coupled with phylofactorization to successfully detect bacterial monophyletic clades subjected to homogeneous (HoS) and heterogenous (HeS) selection. Remarkably, only the HoS clades showed high relative abundance across all samples and signs of putative microdiversity. The majority of the amplicon sequence variants (ASVs) within each HoS clade clustered into a unique 97% sequence similarity operational taxonomic unit (OTU) and inhabited a specific environment (lotic, lentic or terrestrial). Our findings suggest the existence of microdiversification leading to sub-taxa niche differentiation, with putative distinct ecotypes (consisting of groups of ASVs) adapted to a specific environment. We hypothesize that HoS clades thriving in the CPWC have phylogenetically conserved traits that accelerate their rate of evolution, enabling them to adapt to strong spatio-temporally variable selection pressures. Variable selection appears to operate within clades to cause very rapid microdiversification without losing key traits that lead to high abundance. Variable and homogeneous selection, therefore, operate simultaneously but on different aspects of organismal ecology. The result is an overall signal of homogeneous selection due to rapid within-clade microdiversification caused by variable selection. It is unknown whether other systems experience this dynamic, and we encourage future work evaluating the transferability of our results.
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Affiliation(s)
- María V Quiroga
- Instituto Tecnológico de Chascomús (CONICET-UNSAM), Buenos Aires, Argentina
- Escuela de Bio y Nanotecnologías (UNSAM), Buenos Aires, Argentina
| | - James C Stegen
- Pacific Northwest National Laboratory, Ecosystem Science Team, Richland, Washington, USA
| | - Gabriela Mataloni
- Instituto de Investigación e Ingeniería Ambiental (IIIA, CONICET-UNSAM), Buenos Aires, Argentina
| | - Don Cowan
- Centre for Microbial Ecology and Genomics (CMEG), Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa
| | - Pedro H Lebre
- Centre for Microbial Ecology and Genomics (CMEG), Department of Biochemistry, Genetics and Microbiology, University of Pretoria, Pretoria, South Africa
| | - Angel Valverde
- Instituto de Recursos Naturales y Agrobiología de Salamanca (IRNASA), Consejo Superior de Investigaciones Científicas (CSIC), Salamanca, Spain
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Sacramento IF, Schaefer CEGR, Siqueira RG, Corrêa GR, Putzke J, Michel RFM, Francelino MR. Ornithogenesis and soil-landscape interplays at northern Harmony Point, Nelson Island, Maritime Antarctica. AN ACAD BRAS CIENC 2023; 95:e20230722. [PMID: 38126384 DOI: 10.1590/0001-3765202320230722] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2022] [Accepted: 11/16/2023] [Indexed: 12/23/2023] Open
Abstract
Understanding the influence of soil-forming factors and processes in ornithogenic soils is important to predict impacts of climate change on Antarctic ecosystems. Herein, we analyzed the soil-landscape interplays and development of ornithogenic soils at Harmony Point (HP), Nelson Island. We collected, described, and classified 24 soil profiles, combined with vegetation and landforms descriptions. Geoprocessing techniques were employed for mapping. Soil physical, chemical, geochemical, and mineralogical analyses were applied. Patterned ground, "Ornithogenic"/Typic Gelorthent, and moss carpets were the dominant landform, soil and vegetation classes, respectively. Soils from rocky outcrops were more structured, acidic, with higher organic carbon, organometallic complexes, and secondary phosphate minerals, due to former bird influence. Soils from cryoplanated platforms presented higher water pH, base saturation, clay content, and secondary silicate minerals. Soils from marine terraces presented high exchangeable bases, phosphorous, and amorphous phosphate minerals. Soil chemical weathering is enhanced by ornithogenesis and widespread in HP. Besides ornithogenesis, organic matter accumulation, cryoturbation, and cryoclastic processes are also important to pedogenesis of ornithogenic soils. The soils of the cryoplanated platforms exhibited a gradient of pedogenetic development corresponding to increasing biota influence and distance from glacier. In contrast, soils of rocky outcrops were more developed even close to the glacier, due to ornithogenesis.
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Affiliation(s)
- Iorrana F Sacramento
- Universidade Federal de Viçosa, Departamento de Solos, Av. Peter Henry Rolfs, s/n, Campus Universitário, 36570-900 Viçosa, MG, Brazil
| | - Carlos Ernesto G R Schaefer
- Universidade Federal de Viçosa, Departamento de Solos, Av. Peter Henry Rolfs, s/n, Campus Universitário, 36570-900 Viçosa, MG, Brazil
| | - Rafael G Siqueira
- Universidade Federal de Viçosa, Departamento de Solos, Av. Peter Henry Rolfs, s/n, Campus Universitário, 36570-900 Viçosa, MG, Brazil
| | - Guilherme R Corrêa
- Instituto de Geografia, Av. João Naves de Ávila, 2121, Campus Santa Mônica, Bloco 1H, Sala 25, Santa Mônica, 38400-902 Uberlândia, MG, Brazil
| | - Jair Putzke
- Programa de Pós-Graduação em Ciências Biológicas, Universidade Federal do Pampa, Av. Antônio Trilha, Campus de São Gabriel, Centro, 97300-000 São Gabriel, RS, Brazil
| | - Roberto F M Michel
- Universidade Estadual de Santa Cruz, Departamento de Ciências Agrárias e Ambientais, Rodovia Jorge Amado, Km 1, 45662-900 Ilhéus, BA Brazil
| | - Márcio R Francelino
- Universidade Federal de Viçosa, Departamento de Solos, Av. Peter Henry Rolfs, s/n, Campus Universitário, 36570-900 Viçosa, MG, Brazil
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3
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Schaefer CEGR, Senra EO, Schmitz D, Siqueira RG, Paula MDDE, Putzke J, Oliveira FSDE, Maia LG, Ibraimo ASM, Francelino MR. Soils under seal carcasses with varying degrees of decomposition: oasis of nutrients and vegetation in Antarctica. AN ACAD BRAS CIENC 2023; 95:e20230747. [PMID: 38088641 DOI: 10.1590/0001-3765202320230747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 10/02/2023] [Indexed: 12/18/2023] Open
Abstract
Areas of high concentration of seal carcasses have been observed in localized areas of James Ross Island, Antarctica. Such carcasses show an unusual vegetation development, in a semi-arid area with bare soils under intense winds, high salinity and sandy texture. We investigated carcasses of seals around a lake in James Ross Island, with four different stages of decomposition, with three replicates: Seal (S01), with recently mummified carcasses; S02, with partially degraded carcasses; S03, with broken carcasses with partially degraded exposed bones, and S04, with completely broken, scattered skeletons. The vegetation showed a maximum degree of development in carcasses at stages S02 and S03, with the environment between the skin and the skeleton as the preferred place for vegetation establishment. The chemical alteration was greater with increasing carcass decomposition but reduced with the spreading and final decomposition of the bones, with anomalous values observed only in the vicinity of the carcasses. It is concluded that the presence of carcasses of seals, concentrated in wet places, even in a semi-desert climate, represent important oases of nutrients, with a combination of physical and chemical effects throughout the decomposition process that favor plant establishment and succession.
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Affiliation(s)
- Carlos Ernesto G R Schaefer
- Universidade Federal de Viçosa, Núcleo Terrantar, Departamento de Solos, Av. PH Rolfs, s/n, 36570-900 Viçosa, MG, Brazil
| | - Eduardo O Senra
- Universidade Federal de Uberlândia, Unidade Araras, Rodovia LMG 746, Km 1, 38500-000 Monte Carmelo, MG, Brazil
| | - Daniela Schmitz
- Universidade Federal de Viçosa, Núcleo Terrantar, Departamento de Solos, Av. PH Rolfs, s/n, 36570-900 Viçosa, MG, Brazil
- Universidade Federal de Viçosa, Departamento de Biologia Vegetal, Av. PH Rolfs, s/n, 36570-900 Viçosa, MG, Brazil
- ProBioDiversa Brasil, Associação para Conservação da Biodiversidade, Rua Doutor Milton Bandeira, 75, 36570-172 Viçosa, MG, Brazil
| | - Rafael G Siqueira
- Universidade Federal de Viçosa, Núcleo Terrantar, Departamento de Solos, Av. PH Rolfs, s/n, 36570-900 Viçosa, MG, Brazil
| | - Mayara D DE Paula
- Universidade Federal de Viçosa, Núcleo Terrantar, Departamento de Solos, Av. PH Rolfs, s/n, 36570-900 Viçosa, MG, Brazil
| | - Jair Putzke
- Universidade Federal do Pampa, Rua Aluízio Barros Macedo, s/n, BR 290, Km 423, 97307-020 São Gabriel, RS, Brazil
| | - Fabio S DE Oliveira
- Universidade Federal de Minas Gerais, Departamento de Geografia, Av. Antônio Carlos, 6627, Pampulha, 31270-901 Belo Horizonte, MG, Brazil
| | - Lara G Maia
- Universidade Federal de Ouro Preto, Departamento de Geologia, campus Morro do Cruzeiro, s/n, Bauxita, 35400-000 Ouro Preto, MG, Brazil
| | - Anifo S M Ibraimo
- Universidade Federal de Viçosa, Núcleo Terrantar, Departamento de Solos, Av. PH Rolfs, s/n, 36570-900 Viçosa, MG, Brazil
| | - Márcio R Francelino
- Universidade Federal de Viçosa, Núcleo Terrantar, Departamento de Solos, Av. PH Rolfs, s/n, 36570-900 Viçosa, MG, Brazil
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Guajardo-Leiva S, Alarcón J, Gutzwiller F, Gallardo-Cerda J, Acuña-Rodríguez IS, Molina-Montenegro M, Crandall KA, Pérez-Losada M, Castro-Nallar E. Source and acquisition of rhizosphere microbes in Antarctic vascular plants. Front Microbiol 2022; 13:916210. [PMID: 36160194 PMCID: PMC9493328 DOI: 10.3389/fmicb.2022.916210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 08/12/2022] [Indexed: 11/27/2022] Open
Abstract
Rhizosphere microbial communities exert critical roles in plant health, nutrient cycling, and soil fertility. Despite the essential functions conferred by microbes, the source and acquisition of the rhizosphere are not entirely clear. Therefore, we investigated microbial community diversity and potential source using the only two native Antarctic plants, Deschampsia antarctica (Da) and Colobanthus quitensis (Cq), as models. We interrogated rhizosphere and bulk soil microbiomes at six locations in the Byers Peninsula, Livingston Island, Antarctica, both individual plant species and their association (Da.Cq). Our results show that host plant species influenced the richness and diversity of bacterial communities in the rhizosphere. Here, the Da rhizosphere showed the lowest richness and diversity of bacteria compared to Cq and Da.Cq rhizospheres. In contrast, for rhizosphere fungal communities, plant species only influenced diversity, whereas the rhizosphere of Da exhibited higher fungal diversity than the Cq rhizosphere. Also, we found that environmental geographic pressures (i.e., sampling site, latitude, and altitude) and, to a lesser extent, biotic factors (i.e., plant species) determined the species turnover between microbial communities. Moreover, our analysis shows that the sources of the bacterial communities in the rhizosphere were local soils that contributed to homogenizing the community composition of the different plant species growing in the same sampling site. In contrast, the sources of rhizosphere fungi were local (for Da and Da.Cq) and distant soils (for Cq). Here, the host plant species have a specific effect in acquiring fungal communities to the rhizosphere. However, the contribution of unknown sources to the fungal rhizosphere (especially in Da and Da.Cq) indicates the existence of relevant stochastic processes in acquiring these microbes. Our study shows that rhizosphere microbial communities differ in their composition and diversity. These differences are explained mainly by the microbial composition of the soils that harbor them, acting together with plant species-specific effects. Both plant species acquire bacteria from local soils to form part of their rhizosphere. Seemingly, the acquisition process is more complex for fungi. We identified a significant contribution from unknown fungal sources due to stochastic processes and known sources from soils across the Byers Peninsula.
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Affiliation(s)
- Sergio Guajardo-Leiva
- Departamento de Microbiología, Facultad de Ciencias de la Salud, Universidad de Talca, Talca, Chile
- Centro de Ecología Integrativa, Universidad de Talca, Talca, Chile
| | - Jaime Alarcón
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Florence Gutzwiller
- Center for Bioinformatics and Integrative Biology, Facultad de Ciencias de la Vida, Universidad Andres Bello, Santiago, Chile
| | - Jorge Gallardo-Cerda
- Laboratorio de Ecología Integrativa, Instituto de Ciencias Biológicas, Universidad de Talca, Talca, Chile
| | | | - Marco Molina-Montenegro
- Centro de Ecología Integrativa, Universidad de Talca, Talca, Chile
- Laboratorio de Ecología Integrativa, Instituto de Ciencias Biológicas, Universidad de Talca, Talca, Chile
- Centro de Estudios Avanzados en Zonas Áridas, Facultad de Ciencias del Mar, Universidad Católica del Norte, Coquimbo, Chile
- Centro de Investigación en Estudios Avanzados del Maule, Universidad Católica del Maule, Talca, Chile
| | - Keith A. Crandall
- Department of Biostatistics and Bioinformatics, Computational Biology Institute, George Washington University, Washington, DC, United States
| | - Marcos Pérez-Losada
- Department of Biostatistics and Bioinformatics, Computational Biology Institute, George Washington University, Washington, DC, United States
- Division of Emergency Medicine, Department of Pediatrics, George Washington University School of Medicine and Health Sciences, Children’s National Hospital, Washington, DC, United States
- CIBIO-InBIO, Centro de Investigação em Biodiversidade e Recursos Genéticos, Universidade do Porto, Vairão, Portugal
| | - Eduardo Castro-Nallar
- Departamento de Microbiología, Facultad de Ciencias de la Salud, Universidad de Talca, Talca, Chile
- Centro de Ecología Integrativa, Universidad de Talca, Talca, Chile
- *Correspondence: Eduardo Castro-Nallar,
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Grant ML, Bond AL, Lavers JL. The influence of seabirds on their breeding, roosting, and nesting grounds: a systematic review and meta-analysis. J Anim Ecol 2022; 91:1266-1289. [PMID: 35395097 PMCID: PMC9324971 DOI: 10.1111/1365-2656.13699] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Accepted: 03/31/2022] [Indexed: 11/30/2022]
Abstract
Seabird species worldwide are integral to both marine and terrestrial environments, connecting the two systems by transporting vast quantities of marine-derived nutrients and pollutants to terrestrial breeding, roosting, and nesting grounds via the deposition of guano and other allochthonous inputs (e.g., eggs, feathers). We conducted a systematic review and meta-analysis and provide insight into what types of nutrients and pollutants seabirds are transporting, the influence these subsidies are having on recipient environments, with a particular focus on soil, and what may happen if seabird populations decline. The addition of guano to colony soils increased nutrient levels compared to control soils for all seabirds studied, with cascading positive effects observed across a range of habitats. Deposited guano sometimes led to negative impacts, such a guanotrophication, or guano-induced eutrophication, which was often observed where there was an excess of guano or in areas with high seabird densities. While the literature describing nutrients transported by seabirds is extensive, literature regarding pollutant transfer is comparatively limited, with a focus on toxic and bioaccumulative metals. Research on persistent organic pollutants and plastics transported by seabirds is likely to increase in coming years. Studies were limited geographically, with hotspots of research activity in a few locations, but data were lacking from large regions around the world. Studies were also limited to seabird species listed as Least Concern on the IUCN Red List. As seabird populations are impacted by multiple threats and steep declines have been observed for many species worldwide, gaps in the literature are particularly concerning. The loss of seabirds will impact nutrient cycling at localised levels and potentially on a global scale as well, yet it is unknown what may truly happen to areas that rely on seabirds if these populations disappear.
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Affiliation(s)
- Megan L Grant
- Institute for Marine and Antarctic Studies, University of Tasmania, School Road, Newnham, Tasmania, Australia
| | - Alexander L Bond
- Bird Group, Department of Life Sciences, The Natural History Museum, Akeman Street, Tring, Hertfordshire, United Kingdom.,Institute for Marine and Antarctic Studies, University of Tasmania, 20 Castray Esplanade, Battery Point, Tasmania, Australia
| | - Jennifer L Lavers
- Institute for Marine and Antarctic Studies, University of Tasmania, 20 Castray Esplanade, Battery Point, Tasmania, Australia
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CASTRO MARLLONF, MEIER MARTIN, NEVES JÚLIOC, FRANCELINO MÁRCIOR, SCHAEFER CARLOSERNESTOG, OLIVEIRA TEOGENESS. Influence of different seabird species on trace metals content in Antarctic soils. AN ACAD BRAS CIENC 2022; 94:e20210623. [DOI: 10.1590/0001-3765202220210623] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Accepted: 07/13/2021] [Indexed: 11/21/2022] Open
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7
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Ramírez-Fernández L, Orellana LH, Johnston ER, Konstantinidis KT, Orlando J. Diversity of microbial communities and genes involved in nitrous oxide emissions in Antarctic soils impacted by marine animals as revealed by metagenomics and 100 metagenome-assembled genomes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 788:147693. [PMID: 34029816 DOI: 10.1016/j.scitotenv.2021.147693] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/23/2021] [Revised: 04/02/2021] [Accepted: 05/07/2021] [Indexed: 06/12/2023]
Abstract
Antarctic soils generally have low temperatures and limited availability of liquid water and nutrients. However, animals can increase the nutrient availability of ice-free areas by transferring nutrients from marine to terrestrial ecosystems, mainly through their excreta. In this study, we employed shotgun metagenomics and population genome binning techniques to study the diversity of microbial communities in Antarctic soils impacted by marine pinnipeds and birds relative to soils with no evident animal presence. We obtained ~285,000 16S rRNA gene-carrying metagenomic reads representing ~60 phyla and 100 metagenome-assembled genomes (MAGs) representing eight phyla. Only nine of these 100 MAGs represented previously described species, revealing that these soils harbor extensive novel diversity. Proteobacteria, Actinobacteria, and Bacteroidetes were the most abundant phyla in all samples, with Rhodanobacter being one of the most abundant genera in the bird-impacted soils. Further, the relative abundance of genes related to denitrification was at least double in soils impacted by birds than soils without animal influence. These results advance our understanding of the microbial populations and their genes involved in nitrous oxide emissions in ice-free coastal Antarctic soils impacted by marine animals and reveal novel microbial diversity associated with these ecosystems.
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Affiliation(s)
- Lia Ramírez-Fernández
- Laboratorio de Ecología Microbiana, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile
| | - Luis H Orellana
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - Eric R Johnston
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA
| | - Konstantinos T Konstantinidis
- School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, USA; School of Biological Sciences, Georgia Institute of Technology, Atlanta, GA, USA
| | - Julieta Orlando
- Laboratorio de Ecología Microbiana, Departamento de Ciencias Ecológicas, Facultad de Ciencias, Universidad de Chile, Santiago, Chile.
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