Aim The species of the genus Chionodraco (Notothenioidei) are the most abundant icefish on the continental shelf of the Weddell Sea. While previous studies indicated that only Chionodraco hamatus and Chionodraco myersi inhabit the Weddell Sea, the third Chionodraco species, Chionodraco rastrospinosus, was recently sampled in the area. Since C. rastrospinosus is supposed to be found only at the Antarctic Peninsula and Scotia Arc, this study aimed at confirming the species classification of C. rastrospinosus...

1. In mosaic marine habitats, such as intertidal zones, ocean acidification (OA) is exacerbated by high variability of pH, temperature, and biological CO2 production. The non-linear interactions among these drivers can be context-specific and their effect on organisms in these habitats remains largely unknown, warranting further investigation. 2. We were particularly interested in Mytilus edulis (the blue mussel) from intertidal zones of the Gulf of Maine (GOM), USA for this study. GOM is a hot...

Mit der voranschreitenden Digitalisierung von Forschung und Lehre steigt die Zahl an Software-Lösungen, die an wissenschaftlichen Einrichtungen entstehen und zur Erkenntnisgewinnung genutzt werden. Die – unter dem Stichwort Open Science geforderte – Zugänglichkeit und Nachnutzung von wissenschaftlichen Ergebnissen kann in vielen Fachgebieten nur sichergestellt werden, wenn neben Forschungsdaten auch Programmcode offen zugänglich gemacht wird. Die vorliegende Handreichung richtet sich an Entscheider*innen in den Helmholtz-Zentren, die sich mit der Implementierung von Richtlinien für nachhaltige Forschungssoftware befassen....

The end-Permian mass extinction occurred alongside a large swathe of environmental changes that are often invoked as extinction mechanisms, even when a direct link is lacking. One way to elucidate the cause(s) of a mass extinction is to investigate extinction selectivity as it can reveal critical information on organismic traits as key determinants of extinction and survival. Here we show that machine learning algorithms, specifically gradient boosted decision trees, can be used to identify determinants...

Natural history collections are leading successful large-scale projects of specimen digitization (images, metadata, DNA barcodes), transforming taxonomy into a big data science. Yet, little effort has been directed towards safeguarding and subsequently mobilizing the considerable amount of original data generated during the process of naming 15–20,000 species every year. From the perspective of alpha-taxonomists, we provide a review of the properties and diversity of taxonomic data, assess their volume and use, and establish criteria for...

In the deep sea, the phylogeny and biogeography of only a few taxa have been well studied. Although more than 200 species in 32 genera have been described for the asellote isopod families Desmosomatidae Sars, 1897 and Nannoniscidae Hansen, 1916 from all ocean basins, their phylogenetic relationships are not completely understood. There is little doubt about the close relationship of these families, but the taxonomic position of a number of genera is so far unknown....

Comau Fjord, Northern Patagonia, Chile is a core monitoring area to reveal the impact of climate change on benthic cold-water communities. In order to record the water temperature at shallow cold-water coral banks, several long-term stations have been established in 2009. This data set provides the water temperature logged at an interval of 15 min at the station Liliguapi in a depth of 18 m between 2017-01-21 and 2018-04-18.

Here we provide a dataset on genetic and pollen plant diversity retrieved from sedimentary ancient DNA (sedaDNA) of the Bolshoe Toko lake from southeastern Siberia. Our dataset encompasses sedaDNA sequence data of 54 lake sediment samples and pollen grain counts of 67 lake sediments samples. We used a PCR-based metabarcoding approach combined with Next-Generation Sequencing to assess the past, local plant diversity around the analysed lake localities. As a plant specific metabarcode we applied the...

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.

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.

Humpback whale song most likely fulfills a multi-purpose role in the humpback whale mating system including both inter- and intrasexual interactions. Humpback whale males produce most of their songs on the low-latitude breeding grounds, but evidences increase, showing that songs are also produced ‘off-season’ on the feeding grounds or during migration. This opens exciting opportunities to investigate migratory aggregations, study humpback whale behavioral plasticity and potentially even assign individual singers to specific breeding grounds. In...

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.

This is a compilation of all short-wave and long-wave radiation datasets from Neumayer station that were and are published in the frame of BSRN. New data will be added regularly.

This study investigates the relevance of the Elephant Island region for Southern Hemisphere fin whales (Balaenoptera physalus) in their annual life cycle. We collected three years of passive acoustic recordings (Jan 2013 to Feb 2016) northwest of EI to calculate time series of fin whale acoustic indices, daily acoustic occurrence, spectrograms, as well as abundance of their 20-Hz pulses. Acoustic backscatter strength, sea ice concentration and chlorophyll a composites provided concurrent environmental information for graphic...

Woody plants are expanding into the Arctic in response to the warming climate. The impact on arctic plants is not well understood due to the limited knowledge about plant assembly rules. Past plant diversity over long time series is rare. Here, we applied sedimentary ancient DNA metabarcoding targeting the P6 loop of the chloroplast trnL gene to a sediment record from Lake Ilirney (central Chukotka, Far Eastern Russia) covering the last 28 thousand years. Our...

Here, we provide the raw plant DNA metabarcoding data archived in Lake Naleng sediment core spanning the late-glacial to the present (17,700 to 0 cal yr BP). Lake Naleng (31.10° N, 99.7°5 E, 4200 above sea level) is situated in a glacially-formed basin on the southeastern Tibetan Plateau. It is an alpine freshwater lake with a maximum water depth of 36.7 m, an open surface area of 1.7 km2, a specific conductivity of 0.045 mS/cm,...

Die Industrialisierung der Nordhemisphäre führte zur Verschmutzung und Erwärmung natürlicher Ökosysteme. Bei vielen abgelegenen sibirischen Seen lassen sich weitgehende Folgen für ihre Rollen als Süßwasserressourcen und ökologische Refugien feststellen.

Das Alfred-Wegener-Institut macht eine interaktive Tsunami-Karte öffentlich zugänglich – für Medien und Fachkräfte vor Ort sowie Indonesien-Reisende.

Mit der Nationalen Forschungsdateninfrastruktur (NFDI) verfolgen Bund und Länder das Ziel, Datenbestände aus der Forschung für das deutsche Wissenschaftssystem nach den FAIR-Prinzipien systematisch zu erschließen, damit diese für Dritte besser zugänglich gemacht werden. Die NFDI wird als Netzwerk von Konsortien über einen Zeitraum von drei Jahren ab 2020 in drei aufeinanderfolgenden Förderphasen aufgebaut. Eine wichtige Rolle spielt dabei auch die Abdeckung disziplinübergreifender Querschnittsthemen. Zur Förderung des Dialogs zur NFDI in der Helmholtz-Gemeinschaft veranstaltete das Helmholtz...

We continuously measured aerosol size distributions in the range between 90 nm and 5000 nm in 64 bit resolution with an optical particle sizer (TSI LAS3340). The measurements were conducted at the Air Chemistry Observatory (SPUSO) at Neumayer III Station (Antarctica) between 1 January 2020 and 31 December 2020. The data rely on an original 10-minute temporal resolution and are finally submitted as 60-minute averages. Aerosol size distribution measurements are part of the air chemistry...