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Introduction of the technical diving method for scientific diving to investigate biocoenosis in the twilight zone of freshwater lakes

Brümmer, Franz; Remmers, Derk; Müller, Ralph-Walter; Scholz, Steffen

Abstract:
The existence of light-dependent (zooxanthellate) corals at depths between 40 to 150
meters (sometimes up to 300 meters) has been known since the nineteenth century
and they are specifically called mesophotic coral reef (MCR) ecosystems. Their
systematic study began about 50 years ago, but just in the last decade, mainly due to
the development of new diving techniques, these deep coral reefs have been
extensively studied.
Also from the Mediterranean Sea new communities in these depths - the twilight zone
- are described again and again. For example, a veritable underwater forest of black
corals (Antipathella subpinnata) was recently discovered from the Adriatic Sea
(Tremiti Islands) between 52 and 80 meters of water depth.
A description of biotic communities in the twilight zone in freshwater systems, such
as on steep walls, is searched in vain in the relevant literature. Detailed observations
and characterization of mesophotic, almost lightless communities, e. g. of the steep
walls in Lake Constance between 40 and 150 meters, are missing so far.
We present first dives into these area (40 – 100 meters) using the example of the
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Zugehörige Institution(en) am KIT Institut für Automation und angewandte Informatik (IAI)
Publikationstyp Proceedingsbeitrag
Publikationsdatum 22.04.2021
Sprache Englisch
Identifikator KITopen-ID: 1000132331
HGF-Programm 43.31.02 (POF IV, LK 01) Devices and Applications
Erschienen in 6th European Conference on Scientific Diving - TU Bergakademie Freiberg
Veranstaltung 6th European Conference on Scientific Diving (2021), Online, 21.04.2021 – 22.04.2021
Vorab online veröffentlicht am 21.04.2021
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