Anna B. Jöst

Korean Institute of Ocean Science and Technology | KIOST · Subtropical and Tropical Research Center

The ostracod genus Cytheropteron (Ostracoda: Crustacea) has been widely used for paleoenvironmental, paleoceanographic, and paleobiogeographic studies. But species-level data remain limited, especially for deepwater species. Here, we show the depth and spatial distribution patterns of 33 species of the ostracod genus Cytheropteron found in recent s...

Aim The deep waters around Iceland, known as the North Atlantic Gateway, constitute an ideal location to investigate deep‐sea ecological hypotheses. We constructed a comprehensive deep‐sea macroecological dataset of the North Atlantic Gateway region and investigated the controlling factors of large‐scale, deep‐sea species diversity patterns. Locat...

For the first time, soft body parts of ostracod genera, Nipponocythere Ishizaki, 1971 from the family Loxoconchidae and Ambtonia Malz, 1982 from the family Trachyleberididae, both belonging to the superfamily Cytheroidea, are described and illustrated. The specimens are male representatives of the species Nipponocythere bicarinata (Brady, 1880) and...

Cylindroleberididae is a peculiar ostracod myodocopid family, characterized by the presence of gills. It accounts for over 200 species described from all bathymetric ranges and from all the world’s oceans. Nevertheless, its biodiversity is still underestimated, with each study brining new taxa to the list. As a result of recent sampling effort in s...

The genus Semicytherura Wagner, 1957 has nearly 300 species, is common in shallow and marginal marine habitats, and has a worldwide distribution. It is divided into several species groups, of which the Semicytherura henryhowei Hanai & Ikeya, 1977 group is one of the most frequently recorded in temperate Asia. A previous study indicated that many of...

Ostracod crustaceans are among the most abundant microfossils in the geological record, thanks to their strongly calcified shell. Most of the fossils belong to the suborder Cytherocopina, which also has a rich diversity of living species. Unfortunately, many of the living representatives are known only by their shell morphology. Soft body always pr...

Ostracod crustaceans are among the most abundant microfossils in the geological record, thanks to their strongly calcifi ed shell. Most of the fossils belong to the suborder Cytherocopina, which also has a rich diversity of living species. Unfortunately, many of the living representatives are known only by their shell morphology. Soft body always p...

Aim Within the intensively‐studied, well‐documented latitudinal diversity gradient, the deep‐sea biodiversity of the present‐day Norwegian Sea stands out with its notably low diversity, constituting a steep latitudinal diversity gradient in the North Atlantic. The reason behind this has long been a topic of debate and speculation. Most prominently,...

Aim of study Marine climatic transition zones are boundary areas of major climate zones, here the boundary between the subtropical and temperate zones. They present areas containing high abundance of organisms living at the limit of their physiological tolerance. These marginal populations are particularly sensitive to changes in their environment....

Progressive shifts in the benthic ecosystem are observed in temperate environments such as Jeju Island. It is essential to continue studying high-latitude coral communities, which are excellent sentinels of climate change.

New material and new methodologies substantially widen the anatomical knowledge on cocculinid limpets. We first provide 3D-anatomies of Fedikovella caymanensis and Teuthirostria cancellata based on serial sections. Both species differ in several major points (mainly the gill-type and several features of the alimentary tract) from typical cocculinid...

Presented here is an illustrated checklist of benthic marine Ostracoda (Crustacea) recorded from Recent surface sediments of the sub-polar North Atlantic Ocean (SPNA). It presents 142 species (and species groups) belonging to 62 genera from 41 sampling sites collected from the water depths of 144–2749 m.We provide census data with scanning electr...

The potential impact of the environmental changes that our planet is currently undergoing is of major concern to current ecological research. Both, natural and anthropogenically induced, their assessment, extent and consequences consume the efforts of scientists. This thesis focuses on elucidating dominant environmental factors controlling meiobent...

The depth distribution of living specimens of deep-sea benthic ostracods (small crustaceans with calcareous shells that are preserved as microfossils) in sediments is poorly understood, despite the importance of this aspect of basic ostracod biology for paleoecologic and paleoceanographic interpretations. Here, we investigated living benthic ostrac...

Deep-sea benthic Ostracoda (Crustacea) in Icelandic waters are poorly known. Here we report deep-sea ostracode assemblages from the multiple core (MUC) and the epibenthic sledge (EBS) samples collected from Icelandic waters by the first cruise of the IceAGE (Icelandic Marine Animals: Genetics and Ecology) project. Samples from shelf- -edge and lowe...

In order to gain an impression on freshwater ostracode species diversity in Munich, 43 sampling sites from a variety of different water bodies of the city and its commuting area have been investigated. In addition, 6 waters from Chiemgau (Seeonean Lake District & Eggstätt-Hemhofean Lake District) were probed as well. For taxonomical purposes, picke...

This study investigated the inner anatomy of the hadal limpet Fedikovella caymanensis Moskalev, 1976 (Gastropoda, Cocculinidae), which feeds on decayed wood in hadal depths. Based on histological slides and computer aided 3D-reconstruction, a detailed visualization of the animal's organ systems was obtained. The basic anatomical features of F. caym...

Weakly electric fish generate highly regular electric currents (electric organ discharges, EODs) with their electric organ. Within this electric organ, coupled cells, so-called electrocytes, generate an electric field in the range of a few millivolts in a species-specific manner. This field and its distortions are sensed by the fish via electrorece...