A reassessment of testate amoebae diversity in Tierra del Fuego peatlands: Implications for large scale inferences

Burdman, Luciana; Mataloni, Gabriela; Mitchell, Edward A. D.; Lara, Enrique

doi:10.1016/j.ejop.2021.125806

Cited by 7 publications

(2 citation statements)

References 75 publications

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“…For the testate amoebae analyses, a volume of 1 cm 3 of sediment was washed using a 53-µm meshsieve to extract tests under a stereomicroscope (5x), which were counted and slided-mounted in semipermanent preparation with glycerine. Taxonomic identi cation was carried out with the help of an optical microscope (Carl Zeiss Primo Star iLed) at CENAC and a scanning electron microscope (Phillips SEM 515) at CNEA at Bariloche, and by using literature specialized on the group down to genus level (Kumar and Dalby 1998;Sigala et al 2016) and on regional species (Burdman et al 2021;Charqueño-Celis et al 2022). As lacustrine testate amoebae species can display a wide range of eco-phenotypically controlled morphological variations, it is common to assign informal infra-subspeci c "strain" names to eco-phenotypes, which helps to avoid inadvertent and unwarranted descriptions of new species, although the International Code of Zoological Nomenclature stipulates that infra-subspeci c level designation have no status (ICZN 1990).…”

Section: Biological Analysesmentioning

confidence: 99%

Climate and environmental history of Laguna Polo, Santa Cruz, Southern Patagonia (49 °S) since 1300 AD

Charqueño-Celis,

Dubois,

Zolitschka

et al. 2023

Preprint

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Patagonia is located in a unique area for climate studies. It is exposed to the strong Southern Hemisphere Westerly Winds (SWW), which are modulated by the Southern Annular Mode (SAM) and is also directly affected by volcanic eruptions of the Andes Mountain Range. In addition, Patagonia is rich in lacustrine environments, which are ideal for paleocological and palaeoclimatological reconstructions. These characteristics make it an ideal location to study not only the effects of global climate change, but also the impact of local volcanic activities on these still pristine freshwater ecosystems. Here, we present a high-resolution paleolimnological reconstruction using testate amoebae and chironomid assemblages along with organic and inorganic sediment geochemistry (Ca, K, Ti, N, TOC, TOC/N δ15N, δ13C) in a sediment core from Laguna Polo (49 °S, Santa Cruz, Argentina) covering the last 1300 yrs AD. Our results show a warm-dry productive environment at ca. 1300-1420 AD associated to the Medieval Climate Anomaly, colder and less productive environments at the time of the Little Ice Age (LIA: 1420-1720 AD) followed by high volcanic activity affecting the lake water mixing at ca. 1700-1960 AD. Finally, warm-stenothermic chironomid species indicate a progressive increase in temperature since 1960 AD. Thus, the sediments of Laguna Polo provide an excellent opportunity to study the responses of aquatic communities to major climatic and environmental events.

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Section: Biological Analysesmentioning

confidence: 99%

Climate and environmental history of Laguna Polo, Santa Cruz, Southern Patagonia (49 °S) since 1300 AD

Charqueño-Celis,

Dubois,

Zolitschka

et al. 2023

Preprint

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“…But distribution data are rare for soil microscopic organisms at the global scale (Fontaneto et al, 2007). Existing records are patchy due to highly uneven and nonsystematic sampling, with regions such as Europe and North‐America typically better covered than other parts of the world (Burdman et al, 2021; Geisen et al, 2018). Such geographical sampling bias is a known problem in biogeography (Meyer et al, 2015; Troudet et al, 2017), and it is no surprise that the less studied microorganisms suffer from it as much if not more than macroscopic organisms (Yang et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Global distribution modelling of a conspicuous Gondwanian soil protist reveals latitudinal dispersal limitation and range contraction in response to climate warming

Bruni,

Rusconi,

Broennimann

et al. 2023

Diversity and Distributions

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AimThe diversity and distribution of soil microorganisms and their potential for long‐distance dispersal (LDD) are poorly documented, making the threats posed by climate change difficult to assess. If microorganisms do not disperse globally, regional endemism may develop and extinction may occur due to environmental changes. Here, we addressed this question using the testate amoeba Apodera vas, a morphologically conspicuous model soil microorganism in microbial biogeography, commonly found in peatlands and forests mainly of former Gondwana. We first documented its distribution. We next assessed whether its distribution could be explained by dispersal (i.e. matching its climatic niche) or vicariance (i.e. palaeogeography), based on the magnitude of potential range expansions or contractions in response to past and on‐going climatic changes. Last, we wanted to assess the likelihood of cryptic diversity and its potential threat from climate and land‐use changes (e.g. due to limited LDD).LocationDocumented records: Southern Hemisphere and intertropical zone; modelling: Global.MethodsWe first built an updated global distribution map of A. vas using 401 validated georeferenced records. We next used these data to develop a climatic niche model to predict its past (LGM, i.e. 21 ± 3 ka BP; PMIP3 IPSL‐CM5A‐LR), present and future (IPSL‐CMP6A‐LR predictions for 2071–2100, SSP3 and 5) potential distributions in responses to climate, by relating the species occurrences to climatic and topographic predictors. We then used these predictions to test our hypotheses (dispersal/vicariance, cryptic diversity, future threat from LDD limitation).ResultsOur models show that favourable climatic conditions for A. vas currently exist in the British Isles, an especially well‐studied region for testate amoebae where this species has never been found. This demonstrates a lack of interhemispheric LDD, congruent with the palaeogeography (vicariance) hypothesis. Longitudinal LDD is, however, confirmed by the presence of A. vas in isolated and geologically young peri‐Antarctic islands. Potential distribution maps for past, current and future climates show favourable climatic conditions existing on parts of all southern continents, with shifts to higher land from LGM to current in the tropics and a strong range contraction from current to future (global warming IPSL‐CM6A‐LR scenario for 2071–2100, SSP3.70 and SSP5.85) with favourable conditions developing on the Antarctic Peninsula.Main ConclusionsThis study illustrates the value of climate niche models for research on microbial diversity and biogeography, along with exploring the role played by historical factors and dispersal limitation in shaping microbial biogeography. We assess the discrepancy between latitudinal and longitudinal LDD for A. vas, which is possibly due to contrast in wind patterns and/or likelihood of transport by birds. Our models also suggest that climate change may lead to regional extinction of terrestrial microscopic organisms, thus illustrating the pertinence of including microorganisms in biodiversity conservation research and actions.

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Climate and environmental history of Laguna Polo, Santa Cruz, Southern Patagonia (49°S) since 1300 CE

Charqueño-Celis,

Dubois,

Zolitschka

et al. 2024

J Paleolimnol

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A reassessment of testate amoebae diversity in Tierra del Fuego peatlands: Implications for large scale inferences

Cited by 7 publications

References 75 publications

Climate and environmental history of Laguna Polo, Santa Cruz, Southern Patagonia (49 °S) since 1300 AD

Climate and environmental history of Laguna Polo, Santa Cruz, Southern Patagonia (49 °S) since 1300 AD

Global distribution modelling of a conspicuous Gondwanian soil protist reveals latitudinal dispersal limitation and range contraction in response to climate warming

Climate and environmental history of Laguna Polo, Santa Cruz, Southern Patagonia (49°S) since 1300 CE

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