PANGAEA_974110 Fish counts and species at and around artificially introduced tetrapod fields in the southern North Sea, 2023 Fischer, Philipp; Lienkämper, Miriam; Brand, Markus; Mccrea, Cameron; Hoffmann, Henning; Schaeper, Hans; Pogson, Katie; Nader, Lola Fish counts and species at and around artificially introduced tetrapod fields in the southern North Sea, 2023 2025-01-07 PANGAEA Dataset https://doi.pangaea.de/10.1594/PANGAEA.974110 Investigator Philipp Fischer philipp.fischer@awi.de Earth Science Event label DATE/TIME DEPTH, water Name LATITUDE LONGITUDE Direction Distance Kelp, percentage, range Red algae, percentage, range Species, unique identification Species, unique identification (Semantic URI) Species, unique identification (URI) Length class Number of individuals geoscientificInformation Artificial structure Breakwater Coastal protection fish abundance fish diversity Helgoland Helgoland__Campaign Helgoland_TMI, TM5 Helgoland_TN, TN5 Helgoland_TS, TS5 MarGate_TM5 MarGate_TN5 MarGate_TS5 MarGate underwater experimental area North Sea Sampling by diver Scientific diving Tetrapod underwater visual census Marine Station Helgoland 2023-05-10 2023-10-10 Complete 54.19253 54.1937 7.87753 7.879 5.0 m (DEPTH, water) 5.0 m (DEPTH, water) CSD Centre for Scientific Diving AWI_Coast Coastal Ecology @ AWI MarGate MarGate BAH Shelf Seas Systems Ecology @ AWI (former Biologische Anstalt Helgoland) unrestricted CC-BY-4.0: Creative Commons Attribution 4.0 International English PANGAEA Data Publisher for Earth & Environmental Science https://www.pangaea.de/ Data Center Contact Michael Diepenbroek info@pangaea.de

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Bremen Bremen 28359 Germany online 4541 data points text/tab-separated-values Wehkamp, Stephanie; Fischer, Philipp (2013): Crustaceans and fish abundances and species at and around artificially introduced tetrapod fields in the southern North Sea, 2009 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.821909 Wehkamp, Stephanie; Fischer, Philipp (2013): Crustaceans and fish abundances and species at and around artificially introduced tetrapod fields in the southern North Sea, 2010-2011 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.821915 Wehkamp, Stephanie; Fischer, Philipp (2013): Crustaceans and fish abundances and species at and around artificially introduced tetrapod fields in the southern North Sea, 2013 [dataset]. Alfred Wegener Institute - Biological Institute Helgoland, PANGAEA, https://doi.org/10.1594/PANGAEA.821916 Fischer, Philipp; Lienkämper, Miriam; Happel, Lea; Bussmann, Ingeborg; Eickelmann, Laura; Anselm, Norbert; Brand, Markus; Brix, Holger (2024): Hydrographical time series data of Helgoland, Southern North Sea, 2023 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.967855

With increasing global change, coastal protection measures are becoming increasingly important for preserving our coastal features and infrastructure. Coastal protection often comes in the form of artificial structures however, artificial structures can also appear as renewable energy projects, maritime infrastructure and aquaculture installations. The ecological effects of such structures on the natural surroundings remains largely unclear. 36 tetrapod structures (4-footed concrete breakwaters each weighing 2.8 t) in groups of six were added to the MarGate underwater experimental area to the north of Helgoland, in the Southern North Sea, in 2009 at 5 and 10 m water depth. The 5 m fields TN5 (North), TM5 (Middle) and TS5 (South) have been monitored monthly, since their introduction, with respect to the abundance, species composition and size of the associated biota community. By carrying out this monitoring project, we aim to study the long-term effects of artificial structures on the local biotic community in shallow coastal ecosystems. Line transect based visual fish census conducted by trained scientific divers is used to survey the fish communities in the vicinity of each tetrapod field. For this, four 20m long line transects are laid out permanently in the four cardinal directions, each marked at 0, 5, 10, 15 and 20 m distance to the tetrapod field. Data collection is communicated by the diver via voice communication of the surface and noted directly in the standardized protocol together with metadata on algae coverage other environmental parameters. ** For all details see the full metadata description at "https://doi.pangaea.de/10.1594/PANGAEA.974110"!

http://en.wikipedia.org/wiki/ISO_6709 LATITUDE http://en.wikipedia.org/wiki/ISO_6709 LONGITUDE http://en.wikipedia.org/wiki/ISO_8601 DATE/TIME https://doi.pangaea.de/10.1594/PANGAEA.821909 Crustaceans and fish abundances and species at and around artificially introduced tetrapod fields in the southern North Sea, 2009 https://doi.pangaea.de/10.1594/PANGAEA.821915 Crustaceans and fish abundances and species at and around artificially introduced tetrapod fields in the southern North Sea, 2010-2011 https://doi.pangaea.de/10.1594/PANGAEA.821916 Crustaceans and fish abundances and species at and around artificially introduced tetrapod fields in the southern North Sea, 2013 https://doi.pangaea.de/10.1594/PANGAEA.967855 Hydrographical time series data of Helgoland, Southern North Sea, 2023 https://www.awi.de/en/about-us/sites/helgoland.html Marine Station Helgoland https://www.awi.de/en/science/biosciences/coastal-ecology.html AWI_Coast https://www.awi.de/en/science/biosciences/shelf-sea-system-ecology.html BAH https://www.awi.de/en/science/special-groups/scientific-diving/margate.html MarGate https://www.awi.de/en/science/special-groups/scientific-diving.html https://www.awi.de/en/science/special-groups/scientific-diving.html CSD DIF 9.4 2025-01-07 2026-07-15