Landscape Mapping, Ichnological and Benthic Foraminifera Trends in a Deep-Water Gateway, Discovery Gap, NE Atlantic
| Autor: | Dmitry Dorokhov, Anxo Mena, Francisco J. Rodríguez-Tovar, Liubov A. Kuleshova, Evgenia Dorokhova, Viktor Krechik, Tatiana Glazkova |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
bathymetric position index
habitat mapping benthic foraminifera Bathymetric position index Foraminifera Bottom substrate water temperature Computed tomography Holocene Antarctic Bottom Water QE1-996.5 biology Benthic foraminifera Sediment Geology computed tomography Suspended particulate matter biology.organism_classification GIS Substrate (marine biology) suspended particulate matter Habitat mapping Oceanography Benthic zone 2510 Oceanografía 2506.18 Sedimentología bottom substrate Water temperature General Earth and Planetary Sciences Ichnofacies Zoophycos 2510.90 Geología Marina trace fossils Trace fossils |
| Zdroj: | Geosciences Volume 11 Issue 11 Investigo. Repositorio Institucional de la Universidade de Vigo Universidade de Vigo (UVigo) Geosciences, Vol 11, Iss 474, p 474 (2021) Digibug. Repositorio Institucional de la Universidad de Granada instname |
| Popis: | Multidisciplinary studies have allowed us to describe the abiotic landscapes and, thus, reveal the ichnological and benthic foraminifera trends in a deep-water gateway. Mesoscale landscape mapping is presented based on the bathymetric position index, substrate types and near-bottom water temperature. Four sediment cores, retrieved from the entrance, centre and exit of the gap, were subject to computed tomography, ichnological and benthic foraminifera studies. A high diversity of abiotic landscapes in the relatively small area of Discovery Gap is detected and its landscape is characterized by 23 landscape types. The most heterogeneous abiotic factor is a topography that is associated with sediment patchiness and substrate variability. The ichnological and tomographical studies of the sediment cores demonstrate lateral and temporal differences in the macrobenthic tracemaker behaviour. The ichnofossils assemblage of the sediment core can be assigned to the Zoophycos ichnofacies with a higher presence of Zoophycos in the entrance site of the gap and during glacial intervals. Higher benthic foraminifera diversity and species richness during the Holocene are also registered in the southern part of the gap compared to the northern part. The spatial and temporal differences in macro-benthos behavior and benthic foraminifera distribution in the deepwater gateway are proposed to relate to the topographical variations of the Antarctic Bottom Water and its influence on the hydrodynamic regime, nutrient transport, etc. The bathymetric position index analysis and bottom substrates classification were carried out within framework of the state assignment of IO RAS (Theme No. 0128-2021-0016). The landscape mapping, benthic foraminiferal and hydrological studies were supported by the Russian Science Foundation (grant No. 19-17-00246). Research by RT was funded by Projects CGL2015-66835-P and PID2019-104625RB-100 (Secretaría de Estado de I+D+I, Spain), B-RNM-072-UGR18 (FEDER Andalucía), and P18-460 RT-4074 (Junta de Andalucía), and Scientific Excellence Unit UCE-2016-05 (Universidad de Granada). Work by TG was done within the framework of “The Drifters” Research Group at Royal Holloway University of London (RHUL). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|