44 Works

Plant DNA metabarcoding records from three cores of lacustrine lakes along a open larch forest-forest tundra-tundra transect at the Omoloy region, north-eastern Siberia

Sisi Liu, Kathleen R. Stoof-Leichsenring, Stefan Kruse, Luidmila A. Pestryakova & Ulrike Herzschuh
Here, we provide the raw plant DNA metabarcoding data archived in three Siberian lake sediment cores spanning the mid-Holocene to the present (7.6-0 cal ka BP), from northern typical tundra to southern open larch forest in the Omoloy region. There are three cores: 14-OM-20B, Lat. / °: 70.53, Lon. / °: 132.91, Ele. / m a.s.l.: 52, Modern vegetation: open larch forest, Lake area / km2: 0.26, Maximal depth / m: 3.4 14-OM-02B, Lat. /...

Phylogenetic diversity and environment form assembly rules for Arctic diatom genera – a study on recent and ancient sedimentary DNA

Kathleen R. Stoof-Leichsenring
Aim This study investigates taxonomic and phylogenetic diversity in diatom genera to evaluate assembly rules for eukaryotic microbes across the Siberian treeline. We first analysed how phylogenetic distance relates to taxonomic richness and turnover. Second, we used relatedness indices to evaluate if environmental filtering or competition influences the assemblies in space and through time. Third, we used distance-based ordination to test which environmental variables shape diatom turnover. Location Yakutia and Taymyria, Russia: we sampled 78...

Data from: Effects of warming rate, acclimation temperature and ontogeny on the critical thermal maximum of temperate marine fish larvae

Marta Moyano, Caroline Candebat, Yannick Ruhbaum, Santiago Álvarez-Fernández, Guy Claireaux, José-Luis Zambonino-Infante & Myron A. Peck
Most of the thermal tolerance studies on fish have been performed on juveniles and adults, whereas limited information is available for larvae, a stage which may have a particularly narrow range in tolerable temperatures. Moreover, previous studies on thermal limits for marine and freshwater fish larvae (53 studies reviewed here) applied a wide range of methodologies (e.g. the static or dynamic method, different exposure times), making it challenging to compare across taxa. We measured the...

Data from: Idiosyncratic species effects confound size-based predictions of responses to climate change

Marion Twomey, Eva Brodte, Ute Jacob, Ulrich Brose, Tasman P. Crowe & Mark C. Emmerson
Understanding and predicting the consequences of warming for complex ecosystems and indeed individual species remains a major ecological challenge. Here, we investigated the effect of increased seawater temperatures on the metabolic and consumption rates of five distinct marine species. The experimental species reflected different trophic positions within a typical benthic East Atlantic food web, and included a herbivorous gastropod, a scavenging decapod, a predatory echinoderm, a decapod and a benthic-feeding fish. We examined the metabolism–body...

Data from: Patterns and controlling factors of species diversity in the Arctic Ocean

Moriaki Yasuhara, Gene Hunt, Gert Van Dijken, Kevin R. Arrigo, Thomas M. Cronin & Jutta E. Wollenburg
AIM: The Arctic Ocean is one of the last near-pristine regions on Earth and although human activities are expected to impact on Arctic ecosystems, we know very little about baseline patterns of Arctic Ocean biodiversity. This paper aims to describe Arctic Ocean-wide patterns of benthic biodiversity and to explore factors related to the large-scale species diversity patterns. LOCATION: Arctic Ocean. METHODS: We used large ostracode and foraminiferal datasets to describe the biodiversity patterns and apply...

Data from: Parasites affect food web structure primarily through increased diversity and complexity

Jennifer A. Dunne, Kevin D. Lafferty, Andrew P. Dobson, Ryan F. Hechinger, Armand M. Kuris, Neo D. Martinez, John P. McLaughlin, Kim N. Mouritsen, Robert Poulin, Karsten Reise, Daniel B. Stouffer, David W. Thieltges, Richard J. Williams & Claus Dieter Zander
Comparative research on food web structure has revealed generalities in trophic organization, produced simple models, and allowed assessment of robustness to species loss. These studies have mostly focused on free-living species. Recent research has suggested that inclusion of parasites alters structure. We assess whether such changes in network structure result from unique roles and traits of parasites or from changes to diversity and complexity. We analyzed seven highly resolved food webs that include metazoan parasite...

Data from: The model marine diatom Thalassiosira pseudonana likely descended from a freshwater ancestor in the genus Cyclotella

Andrew J Alverson, Bank Beszteri, Matthew L Julius & Edward C Theriot
BACKGROUND: Publication of the first diatom genome, that of Thalassiosira pseudonana, established it as a model species for experimental and genomic studies of diatoms. Virtually every ensuing study has treated T. pseudonana as a marine diatom, with genomic and experimental data valued for their insights into the ecology and evolution of diatoms in the world's oceans. RESULTS: The natural distribution of T. pseudonana spans both marine and fresh waters, and phylogenetic analyses of morphological and...

Diatom sedimentary ancient DNA metabarcoding from western Fram Strait and Kronotsky Peninsula

Heike Zimmermann, Kathleen R. Stoof-Leichsenring, Stefan Kruse, Juliane Müller, Ruediger Stein, Ralf Tiedemann & Ulrike Herzschuh
In this study we use sedimentary ancient DNA metabarcoding from two marine sediment cores. The first Kastenlot core MSM05/5-712-2 was taken at western Fram Strait (subarctic North Atlantic) from which we collected 12 samples including one biological replicate. The second Kastenlot core SO201-2-12KL was retrieved from Kamchatka Strait (subarctic North Pacific) from which we collected 9 samples and 2 samples were collected from a pilot core taken next to the Kastenlot core. Total DNA was...

Data from: Consensus forecasting of intertidal seagrass habitat in the Wadden Sea

Eelke O. Folmer, Justus E. E. Van Beusekom, Tobias Dolch, Ulf Gräwe, Marieke M. Van Katwijk, Kerstin Kolbe, Catharina J. M. Philippart & Catharina J.M. Philippart
After the dramatic eutrophication-induced decline of intertidal seagrasses in the 1970s, the Wadden Sea has shown diverging developments. In the northern Wadden Sea, seagrass beds have expanded and become denser, while in the southern Wadden Sea, only small beds with low shoot densities are found. A lack of documentation of historical distributions hampers conservation management. Yet, the recovery in the northern Wadden Sea provides opportunity to construct robust habitat suitability models to support management. We...

Strategien zur Renaturierung von Abbaugebieten

Felix Janssen, Thomas Soltwedel & Matthias Haeckel
Mehr als 100.000 verschiedene Arten in den Ozeanen sind mittlerweile bekannt, die biologische Vielfalt ist jedoch noch weit größer und viele Arten noch nicht entdeckt. Gerade in der Tiefsee stößt man bei jeder Probenentnahme auf weitere unbekannte Arten. Belastbare Aussagen zu einer potentiellen Wiederbesiedelung abgebauter und gestörter Flächen können nur auf der Basis intensiver wissenschaftlicher Untersuchungen getroffen werden.

Data from: The influence of sea ice, wind speed and marine mammals on Southern Ocean ambient sound

Sebastian Menze, Daniel P. Zitterbart, Ilse Van Opzeeland & Olaf Boebel
This paper describes the natural variability of ambient sound in the Southern Ocean, an acoustically pristine marine mammal habitat. Over a 3-year period, two autonomous recorders were moored along the Greenwich meridian to collect underwater passive acoustic data. Ambient sound levels were strongly affected by the annual variation of the sea-ice cover, which decouples local wind speed and sound levels during austral winter. With increasing sea-ice concentration, area and thickness, sound levels decreased while the...

Data from: Late spring nitrate distributions beneath the ice-covered northeastern Chukchi Shelf

Kevin R. Arrigo, Matthew M. Mills, Gert L. Van Dijken, Kate E. Lowry, Robert S. Pickart & Reiner Schlitzer
Measurements of late springtime nutrient concentrations in Arctic waters are relatively rare due to the extensive sea ice cover that makes sampling difficult. During the SUBICE cruise in May-June 2014, an extensive survey of hydrography and pre-bloom concentrations of inorganic macronutrients, oxygen, particulate organic carbon and nitrogen, and chlorophyll a was conducted in the northeastern Chukchi Sea. Cold (< -1.5°C) winter water was prevalent throughout the study area, and the water column was weakly stratified....

Cross-continental analysis of coastal biodiversity change

Helmut Hillebrand, Gavin M. Rishworth, Janine B. Adams, Matthew S. Bird, Nicola K. Carrasco, Andreas Dänhardt, Jennifer Dannheim, Daniel A. Lemley, Pierre A. Pistorius & Gregor Scheiffarth
Whereas the anthropogenic impact on marine biodiversity is undebated, the quantification and prediction of this change is not trivial. Simple traditional measures of biodiversity (e.g., richness, diversity indices) do not capture the magnitude and direction of changes in species or functional composition. In this paper, we apply recently developed methods for measuring biodiversity turnover to time-series data of four broad taxonomic groups from two coastal regions: the southern North Sea (Germany) and the South African...

Heat stress responses of the kelp Laminaria digitata (Phaeophyceae) across Northeast Atlantic populations: growth, biochemistry, chlorophyll fluorescence, pigments

Daniel Liesner, Louise Fouqueau, Myriam Valero, Michael Y. Roleda, Gareth A. Pearson, Kai Bischof, Klaus Valentin & Inka Bartsch
To understand the thermal plasticity of a coastal foundation species across its latitudinal distribution, we assess physiological responses to high temperature stress in the kelp Laminaria digitata in combination with population genetic characteristics and relate heat resilience to genetic features and phylogeography. We hypothesize that populations from Arctic and cold-temperate locations are less heat resilient than populations from warm distributional edges. Using meristems of natural L. digitata populations from six locations ranging between Kongsfjorden, Spitsbergen...

Humpback whale acoustic presence in the Atlantic sector of the Southern Ocean

Elena Schall, Karolin Thomisch, Olaf Boebel, Gabriele Gerlach, Ilse Van Opzeeland, Stefanie Spiesecke & Sari Mangia Woods
In the Atlantic Sector of the Southern Ocean (ASSO), the investigation of baleen whale distribution by sighting surveys is temporally restricted to the austral summer. The implementation of autonomous passive acoustic monitoring, in turn, allows studying vocal baleen whales year-round. This study describes the results of analyzing passive acoustic data spanning 12 recording positions throughout the ASSO applying a combination of automatic and manual analysis methods to register humpback whale acoustic activity. Humpback whales were...

Data from: The history of tree and shrub taxa on Bol'shoy Lyakhovsky Island (New Siberian Archipelago) since the last interglacial uncovered by sedimentary ancient DNA and pollen data

Heike H. Zimmermann, Elena Raschke, Laura S. Epp, Kathleen R. Stoof-Leichsenring, Lutz Schirrmeister, Georg Schwamborn & Ulrike Herzschuh
Ecosystem boundaries, such as the Arctic-Boreal treeline, are strongly coupled with climate and were spatially highly dynamic during past glacial-interglacial cycles. Only a few studies cover vegetation changes since the last interglacial, as most of the former landscapes are inundated and difficult to access. Using pollen analysis and sedimentary ancient DNA (sedaDNA) metabarcoding, we reveal vegetation changes on Bol’shoy Lyakhovsky Island since the last interglacial from permafrost sediments. Last interglacial samples depict high levels of...

Baseline-Studien für die Erkundungsgebiete. Wie tief reicht der Sauerstoff, was sind die Sedimentationsraten?

Sabine Kasten
Ohne die Kenntnisse der Sedimentationsbedingungen sowie der ökologischen und geochemischen Zustände in der Tiefsee können die Auswirkungen zukünftiger menschlicher Eingriffe in die Tiefsee nicht ermittelt werden. Insbesondere die Clarion-Clipperton Zone (CCZ) im äquatorialen Pazifik ist für den Manganknollen-Abbau potentiell interessant und Gegenstand der Untersuchungen.

Abbau- und Managementstrategien

Felix Janssen, Thomas Soltwedel & Matthias Haeckel
Momentan wird erwartet, dass Schädigungen durch den Abbau reduziert werden können, wenn gestörte Flächen durch ungestörte Areale unterbrochen sind. Es besteht jedoch noch umfassender Forschungsbedarf, um wissenschaftlich fundierte Empfehlungen zu geeigneten Abbaustrategien zu geben. Es kann gegenwärtig noch nicht vorhergesagt werden, inwieweit diese geeignet sind, durch Tiefseebergbau verursachte Umweltfolgen abzumildern und irreversible Schädigungen abzuwenden.

Toolik Lake Research Natural Area AISA-Eagle hyperspectral Mosaic. An EnMAP Preparatory Flight Campaign

Alison Beamish, Sabine Chabrillat, Maximilian Brell, Birgit Heim & Torsten Sachs
EnMAP Flight Campaigns Technical Reports

What Peer-review Experiences Can Offer To Early Career Scientists And To The Scientific Community

Gwenaëlle Gremion, Mathieu Casado, Kelsey Aho, Jilda Alicia Caccavo, Nicolas Champollion, Emily Choy, Sarah L. Connors, Rahul Dey, Alfonso Fernandez, Gerlis Fugmann, Juan Höfer, Shridhar Jawak, Martine Lizotte, Sarah Maes, Kyle Mayers, Katja Mintenbeck, Jhon Fredy Mojica Moncada, Prashant H. Pandit, Elvira Poloczanska, Paul Rosenbaum, Elisa Seyboth, Sarah Shakil & Maud van Soest

Data from: Intraspecific trait variation and trade-offs within and across populations of a toxic dinoflagellate

Karen M. Brandenburg, Sylke Wohlrab, Uwe John, Anke Kremp, Jacqueline Jerney, Bernd Krock & Dedmer B. Van De Waal
Intraspecific trait diversity can promote the success of a species, as complementarity of functional traits within populations may enhance its competitive success and facilitates resilience to changing environmental conditions. Here, we experimentally determined the variation and relationships between traits in 15 strains of the toxic dinoflagellate Alexandrium ostenfeldii derived from two populations. Measured traits included growth rate, cell size, elemental composition, nitrogen uptake kinetics, toxin production and allelochemical potency. Our results demonstrate substantial variation in...

Marine stepping-stones: Connectivity of Mytilus edulis populations between offshore energy installations

Joop W.P. Coolen, Arjen R. Boon, Richard Crooijmans, Hilde Van Pelt, Frank Kleissen, Daan Gerla, Jan Beermann, Silvana N.R. Birchenough, Lisa E. Becking & Pieternella C. Luttikhuizen
Recent papers postulate that epifaunal organisms use artificial structures as stepping-stones to spread to areas that are too distant to reach in a single generation. With thousands of artificial structures present in the North Sea, we test the hypothesis that these structures are connected by water currents and act as an interconnected reef. Population genetic structure of the Blue mussel, Mytilus edulis was expected to follow a pattern predicted by particle tracking models (PTM). Correlation...

Data from: Curation: heat stress responses and population genetics of the kelp Laminaria digitata (Phaeophyceae) across latitudes reveal differentiation among North Atlantic populations

Louise Fouqueau, Daniel Liesner, Myriam Valero, Michael Roleda, Gareth Pearson, Kai Bischof, Klaus Valentin & Inka Bartsch
We aim to understand the thermal plasticity of a coastal foundation species across its latitudinal distribution by assessing physiological responses to high temperature stress in the kelp Laminaria digitata in combination with population genetic characteristics. We hypothesize that Arctic and cold-temperate populations are less heat resilient than warm-temperate populations. Using meristems of natural L. digitata populations from six locations ranging between Kongsfjorden, Spitsbergen (79°N), and Quiberon, France (47°N), we performed a common-garden heat stress experiment...

Plant diversity data from modern sedimentary DNA of lakes in Siberia and China

Kathleen R. Stoof-Leichsenring, Sisi Liu, Weihan Jia, Kai Li, Luidmila A. Pestryakova, Steffen Mischke, Xianyong Cao, Xinqui Liu, Jian Ni, Stefan Neuhaus & Ulrike Herzschuh
Here we provide a large dataset on genetic plant diversity retrieved from surface sedimentary DNA (sedDNA) of lakes from Siberia and China spanning over a large environmental gradient. Our dataset encompasses sedDNA sequence data of 244 surface lake sediments and 3 soil samples originating from Siberia and Chinese lakes. We used a PCR-based metabarcoding approach combined with Next-Generation Sequencing to assess the modern and local plant diversity in and around the analysed lake localities. As...

Data from: Spatial structuring and life history connectivity of Antarctic silverfish along the southern continental shelf of the Weddell Sea

Jilda Alicia Caccavo, Julian R. Ashford, Svenja Ryan, Chiara Papetti, Michael Schröder & Lorenzo Zane
A multidisciplinary approach was employed to examine a physical-biological population hypothesis for a critical forage species, the Antarctic silverfish (Pleuragramma antarctica). A previous study had shown strong gene flow along the westward Antarctic Slope Current, in addition to spatially recurring length modes that provided evidence for episodic connectivity. In this paper, otolith nucleus chemistry from a subset of fish collected in the southern Weddell Sea as part of a hydrographic survey of the Filchner Trough...

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  • Alfred Wegener Institute for Polar and Marine Research
  • Helmholtz Association of German Research Centres
  • GEOMAR Helmholtz Centre for Ocean Research Kiel
  • University of Hamburg
  • Royal Netherlands Institute for Sea Research
  • Helmholtz Centre Potsdam - GFZ German Research Centre for Geosciences
  • University of Padua
  • Stanford University
  • University of Algarve
  • University of Iceland