Search results for: Elie Verleyen

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article

Diatoms define a novel freshwater biogeography of the Antarctic

Elie Verleyen, Bart Van de Vijver, Bjorn Tytgat, Eveline Pinseel, more

Ecography > 44 > 4 > 548 - 560

Terrestrial biota in the Antarctic are more globally distinct and highly structured biogeographically than previously believed, but information on biogeographic patterns and endemism in freshwater communities is largely lacking. We studied biogeographic patterns of Antarctic freshwater diatoms based on the analysis of species occurrences in a dataset of 439 lakes spread across the Antarctic realm...

article

Correction to: Comparative vegetation survey with focus on cryptogamic covers in the high Arctic along two differing catenas

Ramona Kern, Vivien Hotter, Aline Frossard, Martin Albrecht, more

Polar Biology > 2019 > 42 > 11 > 2147-2147

This correction stands to the correct a spelling error to contributor name: Karin Glaser. The author group and the publisher wish all to recognize the name as Karin Glaser and not the former. The original article has been corrected.

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Comparative vegetation survey with focus on cryptogamic covers in the high Arctic along two differing catenas

Ramona Kern, Vivien Hotter, Aline Frossard, Martin Albrecht, more

Polar Biology > 2019 > 42 > 11 > 2131-2145

Although cryptogamic covers are important ecosystem engineers in high Arctic tundra, they were often neglected in vegetation surveys. Hence we conducted a systematic survey of cryptogamic cover and vascular plant coverage and composition at two representative, but differing Arctic sites (Ny-Ålesund, Svalbard) along catenas with a natural soil moisture gradient, and integrated these data with physical–chemical...

article

Regional-scale drivers of marine nematode distribution in Southern Ocean continental shelf sediments

Freija Hauquier, Elie Verleyen, Bjorn Tytgat, Ann Vanreusel

Progress in Oceanography > 2018 > 165 > C > 1-10

Many marine meiofauna taxa seem to possess cosmopolitan species distributions, despite their endobenthic lifestyle and restricted long-distance dispersal capacities. In light of this paradox we used a metacommunity framework to study spatial turnover in free-living nematode distribution and assess the importance of local environmental conditions in explaining differences between communities in surface...

article

Persistence and changes in the peripheral Beles basin of Ethiopia

Jan Nyssen, Fikre Fetene, Mekete Dessie, Getachew Alemayehu, more

Regional Environmental Change > 2018 > 18 > 7 > 2089-2104

We have investigated the relevance of the notion of “peripheralism” in the Beles basin. In this lowland border area of Ethiopia, important investments require an evaluation of their socio-economic and ecological impacts in the light of Ethiopia’s Climate-Resilient Green Economy (CRGE) strategy. We contrasted literature of different periods with field observations. In the middle and lower parts of...

article

Ice sheet retreat and glacio-isostatic adjustment in Lützow-Holm Bay, East Antarctica

Elie Verleyen, Ines Tavernier, Dominic A. Hodgson, Pippa L. Whitehouse, more

Quaternary Science Reviews > 2017 > 169 > C > 85-98

The East Antarctic Ice Sheet has relatively few field data to constrain its past volume and contribution to global sea-level change since the Last Glacial Maximum. We provide new data on deglaciation history and develop new relative sea-level (RSL) curves along an 80 km transect (from Skallen to Skarsvnes, Langhovde and the Ongul Islands) in Lützow Holm Bay, East Antarctica. The geological constraints...

article

Diversity, ecology and community structure of the freshwater littoral diatom flora from Petuniabukta (Spitsbergen)

Eveline Pinseel, Bart Van de Vijver, Jan Kavan, Elie Verleyen, more

Polar Biology > 2017 > 40 > 3 > 533-551

Despite the frequent application of diatoms in palaeoecological research in the High Arctic, our knowledge concerning the diversity, ecology, community associations, community dynamics and survival strategies of High Arctic freshwater littoral diatom floras is still rather limited. In the present study, the diversity, ecological characteristics and community structures of the freshwater littoral diatom...

article

A diatom‐inferred record of lake variability during the last 900 years in Lützow–Holm Bay, East Antarctica

Rachel C. Rudd, Jonathan J. Tyler, John Tibby, Yusuke Yokoyama, more

Journal of Quaternary Science > 31 > 2 > 114 - 125

Decadal–centennial‐scale climate variability in coastal Antarctica remains poorly understood due to the limited number of highly resolved, well‐dated records. We present a 900‐year, decadal‐scale reconstruction based on sedimentary diatoms from Lake Abi in Lützow–Holm Bay, East Antarctica. Hydrological change is inferred from diatom ecological preferences in conjunction with an existing regional...

article

Rapid early Holocene sea-level rise in Prydz Bay, East Antarctica

Dominic A. Hodgson, Pippa L. Whitehouse, Gijs De Cort, Sonja Berg, more

Global and Planetary Change > 2016 > 139 > C > 128-140

Prydz Bay is one of the largest embayments on the East Antarctic coast and it is the discharge point for approximately 16% of the East Antarctic Ice Sheet. Geological constraints on the regional ice sheet history include evidence of past relative sea-level change at three sites; the Vestfold Hills, Rauer Islands and Larsemann Hills. In this paper we compile updated regional relative sea-level data...

chapter

The diversity and distribution of diatoms: from cosmopolitanism to narrow endemism

Pieter Vanormelingen, Elie Verleyen, Wim Vyverman

Topics in Biodiversity and Conservation > Protist Diversity and Geographical Distribution > 159-171

It has been claimed that microbial taxa will not exhibit endemism because their enormous populations remove dispersal as an effective constraint on geographical range. Here we review evidence that challenges this ubiquity hypothesis for the most speciose group of microbial eukaryotes, the diatoms. Detailed taxonomic inventories using fine-grained morphological characteristics, molecular markers, and...

article

Development of a regional glycerol dialkyl glycerol tetraether (GDGT)–temperature calibration for Antarctic and sub-Antarctic lakes

Louise C. Foster, Emma J. Pearson, Steve Juggins, Dominic A. Hodgson, more

Earth and Planetary Science Letters > 2016 > 433 > C > 370-379

A regional network of quantitative reconstructions of past climate variability is required to test climate models. In recent studies, temperature calibration models based on the relative abundances of sedimentary glycerol dialkyl glycerol tetraethers (GDGTs) have enabled past temperature reconstructions in both marine and terrestrial environments. Nevertheless, to date these methods have not been...

article

Chodatodesmus australis sp. nov. (Scenedesmaceae, Chlorophyta) from Antarctica, with the emended description of the genus Chodatodesmus, and circumscription of Flechtneria rotunda gen. et sp. nov.

Katia Sciuto, Louise A. Lewis, Elie Verleyen, Isabella Moro, more

Journal of Phycology > 51 > 6 > 1172 - 1188

The family Scenedesmaceae is a taxonomically complicated group due to its simple morphology, high phenotypic plasticity, and the presence of cryptic taxa. Over the years several taxonomic revisions, based on molecular data, affected the family. Here, we describe a new scenedesmacean species from Antarctica, Chodatodesmus australis, based on phylogenetic analyses of data from nuclear (ITS2 spacer,...

article

Antarctic shallow water benthos in an area of recent rapid glacier retreat

Francesca Pasotti, Elena Manini, Donato Giovannelli, Anne‐Cathrin Wölfl, more

Marine Ecology > 36 > 3 > 716 - 733

The West Antarctic Peninsula is one of the fastest warming regions on Earth. Faster glacier retreat and related calving events lead to more frequent iceberg scouring, fresh water input and higher sediment loads, which in turn affect shallow water benthic marine assemblages in coastal regions. In addition, ice retreat creates new benthic substrates for colonization. We investigated three size classes...

article

Late Quaternary environmental changes in Marguerite Bay, Antarctic Peninsula, inferred from lake sediments and raised beaches

Dominic A. Hodgson, Stephen J. Roberts, James A. Smith, Elie Verleyen, more

Quaternary Science Reviews > 2013 > 68 > Complete > 216-236

The Antarctic Peninsula is one of the fastest-warming regions on Earth, but its palaeoenvironmental history south of 63° latitude is relatively poorly documented, relying principally on the marine geological record and short ice cores. In this paper, we present evidence of late-Quaternary environmental change from the Marguerite Bay region combining data from lake sediment records on Horseshoe Island...

article

Molecular Evidence for Distinct Antarctic Lineages in the Cosmopolitan Terrestrial Diatoms Pinnularia borealis and Hantzschia amphioxys

Caroline Souffreau, Pieter Vanormelingen, Bart Van de Vijver, Tsvetelina Isheva, more

Protist > 2013 > 164 > 1 > 101-115

Recent morphology-based studies indicate that freshwater diatom floras in the Antarctic comprise a significant share of endemics among a majority of apparently cosmopolitan species. Given the widespread (pseudo)cryptic species diversity in diatoms, we assessed the molecular divergence and temperature-dependent growth characteristics between Antarctic and non-Antarctic strains for two presumed species...

article

Late Holocene changes in cyanobacterial community structure in maritime Antarctic lakes

Rafael Fernandez-Carazo, Elie Verleyen, Dominic A. Hodgson, Stephen J. Roberts, more

Journal of Paleolimnology > 2013 > 50 > 1 > 15-31

Despite the dominance of cyanobacteria in polar freshwater aquatic ecosystems, little is known about their past biodiversity and response to climate and environmental changes. We explored the use of light microscopy of microfossils, high performance liquid chromatography of the fossil pigment composition and denaturing gradient gel electrophoresis of fossil 16S rRNA genes to study past and present-day...

article

Post-glacial regional climate variability along the East Antarctic coastal margin – evidence from shallow marine and coastal terrestrial records

Elie Verleyen

Quaternary International > 2012 > 279-280 > Complete > 518-519

article

Holocene glacial and climate history of Prince Gustav Channel, northeastern Antarctic Peninsula

Mieke Sterken, Stephen J. Roberts, Dominic A. Hodgson, Wim Vyverman, more

Quaternary Science Reviews > 2012 > 31 > Complete > 93-111

The Antarctic Peninsula is one of the most rapidly warming regions on Earth, as evidenced by a recent increase in the intensity and duration of summer melting, the recession of glaciers and the retreat and collapse of ice shelves. Despite this, only a limited number of well-dated near shore marine and lake sediment based palaeoenvironmental records exist from this region; so our understanding of the...

article

Heterotrophic bacterial diversity in aquatic microbial mat communities from Antarctica

Karolien Peeters, Elie Verleyen, Dominic A. Hodgson, Peter Convey, more

Polar Biology > 2012 > 35 > 4 > 543-554

Heterotrophic bacteria isolated from five aquatic microbial mat samples from different locations in continental Antarctica and the Antarctic Peninsula were compared to assess their biodiversity. A total of 2,225 isolates obtained on different media and at different temperatures were included. After an initial grouping by whole-genome fingerprinting, partial 16S rRNA gene sequence analysis was used...

article

Geological constraints on glacio-isostatic adjustment models of relative sea-level change during deglaciation of Prince Gustav Channel, Antarctic Peninsula

Stephen J. Roberts, Dominic A. Hodgson, Mieke Sterken, Pippa L. Whitehouse, more

Quaternary Science Reviews > 2011 > 30 > 25-26 > 3603-3617

The recent disintegration of Antarctic Peninsula ice shelves, and the associated accelerated discharge and retreat of continental glaciers, has highlighted the necessity of quantifying the current rate of Antarctic ice mass loss and the regional contributions to future sea-level rise. Observations of present day ice mass change need to be corrected for ongoing glacial isostatic adjustment, a process...

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Search results for: Elie Verleyen

Diatoms define a novel freshwater biogeography of the Antarctic

Correction to: Comparative vegetation survey with focus on cryptogamic covers in the high Arctic along two differing catenas

Comparative vegetation survey with focus on cryptogamic covers in the high Arctic along two differing catenas

Regional-scale drivers of marine nematode distribution in Southern Ocean continental shelf sediments

Persistence and changes in the peripheral Beles basin of Ethiopia

Ice sheet retreat and glacio-isostatic adjustment in Lützow-Holm Bay, East Antarctica

Diversity, ecology and community structure of the freshwater littoral diatom flora from Petuniabukta (Spitsbergen)

A diatom‐inferred record of lake variability during the last 900 years in Lützow–Holm Bay, East Antarctica

Rapid early Holocene sea-level rise in Prydz Bay, East Antarctica

The diversity and distribution of diatoms: from cosmopolitanism to narrow endemism

Development of a regional glycerol dialkyl glycerol tetraether (GDGT)–temperature calibration for Antarctic and sub-Antarctic lakes

Chodatodesmus australis sp. nov. (Scenedesmaceae, Chlorophyta) from Antarctica, with the emended description of the genus Chodatodesmus, and circumscription of Flechtneria rotunda gen. et sp. nov.

Antarctic shallow water benthos in an area of recent rapid glacier retreat

Late Quaternary environmental changes in Marguerite Bay, Antarctic Peninsula, inferred from lake sediments and raised beaches

Molecular Evidence for Distinct Antarctic Lineages in the Cosmopolitan Terrestrial Diatoms Pinnularia borealis and Hantzschia amphioxys

Late Holocene changes in cyanobacterial community structure in maritime Antarctic lakes

Post-glacial regional climate variability along the East Antarctic coastal margin – evidence from shallow marine and coastal terrestrial records

Holocene glacial and climate history of Prince Gustav Channel, northeastern Antarctic Peninsula

Heterotrophic bacterial diversity in aquatic microbial mat communities from Antarctica

Geological constraints on glacio-isostatic adjustment models of relative sea-level change during deglaciation of Prince Gustav Channel, Antarctic Peninsula

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