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Servant-Vildary, Simone; Servant, Michel; Jimenez, O.

doi:10.1023/a:1014557417689

Cited by 7 publications

(2 citation statements)

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“…Several researchers have considered that these taxa are generalists with an r-strategy and their rapid substrate colonization and high reproduction rate confer them resilience to short-term environmental fluctuations, making them very competitive species under unstable limnological conditions (Lotter and Bigler 2000;Weckström and Juggins 2006;Lotter et al 2010). The presence of a given genus and species of this group has been used as an indication of changes in prolonged ice cover, water temperature, nutrient status, salinity, pH and climatedriven environmental variables (Smol 1988;Dixit et al 1992;Wilson et al 1997;Douglas and Smol 1999;Lotter and Bigler 2000;Karst-Riddoch et al 2009). Thus, they are regarded as good environmental indicators in research projects focused on paleo-and neolimnological conditions.…”

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confidence: 99%

On the geographical distribution and ecology of Pseudostaurosira cataractarum (Bacillariophyceae): new findings in the Palearctic and Neotropic ecozones

Grana

Morales

Bešta³

et al. 2015

Braz. J. Bot

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The aim of this paper is to expand the current knowledge on the distribution, ecology and morphology of Pseudostaurosira cataractarum (Hustedt) C.E. Wetzel, E. Morales et Ector. We analysed several freshwater diatom assemblages within the Palearctic (Czech Republic, Europe) and Neotropic ecozones (Argentina and Bolivia, South America). In all localities, small araphids were the dominant or co-dominant group. Inside this group, P. cataractarum was only dominant in the samples from Argentina and Czech Republic, while the Bolivian samples had only a few individuals. RDA and PCA analyses show that the relative abundance of P. cataractarum was positively correlated with water conductivity. The following measurements resulted from the morphometric analysis, apical axis: 2.8-8.2 lm, transapical axis: 2.7-7.2 lm and stria density: 15-29 in 10 lm. In conclusion, the present is the first report of P. cataractarum for continental Europe (from fossil material) and the Neotropic ecozone (from extant populations). Besides having a preference for subaerial habitats, this taxon could be locally conditioned by water conductivity, although in each of the analysed samples this species was associated with cosmopolitan diatoms that are tolerant to a wide range of environmental conditions. Based on the morphometric analyses in studied populations, we propose that the size range for the apical and transapical axes of P. cataractarum should be expanded at the lower end of the range. Likewise, the range of stria density should be expanded since it is wider than that presented for the type population from Indonesia (Java). Consequently, an emended description is presented based on our study and on published data on type and fossil populations.

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confidence: 99%

On the geographical distribution and ecology of Pseudostaurosira cataractarum (Bacillariophyceae): new findings in the Palearctic and Neotropic ecozones

Grana

Morales

Bešta³

et al. 2015

Braz. J. Bot

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“…Model simulations demonstrate late glacial climate change (i.e., precipitation), drove the competitive replacement of droughtadapted vegetation (e.g., savannah or deciduous/semideciduous dry forest) by rainforest in drought-sensitive ecotonal areas (Beerling and Mayle, 2006). Precipitation increased in tropical lowland South America after ∼12,800 cal year BP, as indicated by more frequent flooding and rising lake levels at LLG (Whitney et al, 2011), and in the Andes, water levels increased at Salar de Uyuni (Servant-Vildary et al, 2001) and Lake Titicaca (Baker et al, 2001). Reconstructions from LLG indicate that deglacial temperatures in the lowland Bolivian Amazon rose by 4 • C at 19,500 cal year BP and have likely remained relatively consistent until present (Whitney et al, 2011), supporting the interpretation that temperature was not the dominant driver of late glacial-Holocene vegetation change at NKMNP.…”

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Fire-human-climate interactions in the Bolivian Amazon rainforest ecotone from the Last Glacial Maximum to late Holocene

Maezumi,

Power,

Smith

et al. 2023

Front. Environ. Archaeol.

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The Amazon Rainforest Ecotone (the ARF-Ecotone) of the southwestern Amazon Basin is a transitional landscape from tropical evergreen rainforests and seasonally flooded savannahs to savannah woodlands and semi-deciduous dry forests. While fire activity plays an integral role in ARF-Ecotones, recent interactions between human activity and increased temperatures and prolonged droughts driven by anthropogenic climate change threaten to accelerate habitat transformation through positive feedbacks, increasing future fire susceptibility, fuel loads, and fire intensity. The long-term factors driving fire in the ARF-Ecotone remain poorly understood because of the challenge of disentangling the effects of prolonged climatic variability since the Last Glacial Maximum (LGM; ~24,000 to 11,000 cal BP) and over 10,500 years of human occupation in the region. To investigate this issue, we implement an interdisciplinary framework incorporating multiple lake sediment cores, with varying basin characteristics with existing regional palaeoclimatological and archaeological data. These data indicate expansive C4 grasslands coupled with low fire activity during the LGM, higher sensitivity of small basins to detecting local-scale fire activity, and increased spatial diversity of fire during the Holocene (~10,500 cal year BP to the limit of our records ~4,000 cal year BP), despite a similar regional climate. This may be attributed to increased human-driven fire. These data raise the intriguing possibility that the composition of modern flora at NKMNP developed as part of a co-evolutionary process between people and plants that started at the beginning of the ARE occupation.

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Holocene precipitation and atmospheric changes inferred from river paleowetlands in the Bolivian Andes

Servant

Servant-Vildary

2003

Palaeogeography, Palaeoclimatology, Palaeoecology

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Cited by 7 publications

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On the geographical distribution and ecology of Pseudostaurosira cataractarum (Bacillariophyceae): new findings in the Palearctic and Neotropic ecozones

On the geographical distribution and ecology of Pseudostaurosira cataractarum (Bacillariophyceae): new findings in the Palearctic and Neotropic ecozones

Fire-human-climate interactions in the Bolivian Amazon rainforest ecotone from the Last Glacial Maximum to late Holocene

Holocene precipitation and atmospheric changes inferred from river paleowetlands in the Bolivian Andes

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