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Benthic macrofauna abundance and biomass in the muddy region in southeast of the island of Helgoland (North Sea)

Benthic macrofauna were sampled on expedition HE625 of the R/V Heincke in July 2023 at 50 stations spread evenly over the muddy sediment region in southeast of the island of Helgoland (southeastern North Sea). At each station, two replicate samples were taken with a van Veen grab with a sampling area of 0.1 m² and a penetration depth of 10 cm. The first sample was sieved through a 1000 µm mesh to retain macrofauna, and species were determined to the lowest taxonomic level. The WoRMS LSIDs (AphiaID) was provided to identify the scientific name of the species. For each taxon, the total wet weight was measured with a precision of 0.001 g. The dataset comprises counted abundance and biomass records for 171 infaunal taxa.

Abundance

Ten major communities with characteristic species according to hierarchal clustering and indicator species analysis based on abundance data. Community analysis is done based on the abundance and biomass data averaged for all sampling events in within 5 km grid cell. Based on the harmonized dataset that comprises data at over 7000 locations (17000 visit events) mostly sampled in period 2000-2013. Full coverage map of abundance-based communities predicted with Random Forest.

Abundance - point

Ten major communities with characteristic species according to hierarchal clustering and indicator species analysis based on abundance data. Community analysis is done based on the abundance and biomass data averaged for all sampling events in within 5 km grid cell. Based on the harmonized dataset that comprises data at over 7000 locations (17000 visit events) mostly sampled in period 2000-2013. Full coverage map of abundance-based communities predicted with Random Forest.

tick monitoring Alb 2008 to 2010

<p>Original data comes from a project which takes or took place as part of the DFG priority program "Exploratories for large-scale and long-term functional biodiversity research". The data is stored together with descriptive metadata, in combination called a dataset, in the project repository (https://www.bexis.uni-jena.de). Species information was extracted from that original dataset. The second paragraph is part of the metadata of the original dataset.</p> <p>Documented in: Lauterbach R, Wells K, O'Hara RB, Kalko EKV, Renner SC (2013) Variable Strength of Forest Stand Attributes and Weather Conditions on the Questing Activity of Ixodes ricinus Ticks over Years in Managed Forests. PLoS ONE 8(1): e55365. doi:10.1371/journal.pone.0055365</p>

NW Pacific Deep-sea Benthos Biodiversity (Beneficial Project)

In the past decade, the biology of the bathyal, abyssal, and hadal faunas of all size classes(meio- macro-, and megabenthos) of the NW Pacific have been intensively investigated based on a Memorandum of Understanding (2007) between Russian and German partners. A total of four Russian-German and German-Russian expeditions with the RV Akademik M.A. Lavrentyev and RV Sonne have provided a wealth of data on the systematics, evolution and biogeography of the deep-sea faunas of the Sea of Japan (SojaBio, 2010) (Malyutina and Brandt 2013), Sea of Okhotsk (SokhoBio, 2015) (Malyutina et al. 2018), the Kuril-Kamchatka Trench (KKT), and the NW Pacific open abyssal plain adjacent to the KKT (KuramBio I and II, 2012 - 2016) (Brandt et al. 2019; Brandt et al. 2018; Brandt et al. 2020; Brandt and Malyutina 2015). The goals of these expeditions were to study the biodiversity, biogeography, and evolution of the benthic organisms in different NW Pacific deep-sea environments. We aimed to compare more isolated deep-sea basins with more easily accessible ones (Sea of Japan vs. Sea of Okhotsk) and to test whether the hadal bottom of the trench of the KKT isolates the fauna from the Sea of Okhotsk to the fauna of the open NW Pacific area. The faunal composition of these areas comprising systematic, ecological, and biogeographical data, as well as evolution of protists, selected invertebrate taxa and fish, has been published in four scientific volumes, and includes the formal descriptions of many species, some genera, and one family (Brandt et al. 2020; Brandt and Malyutina 2015; Malyutina and Brandt 2013; Malyutina et al. 2018; Saeedi et al. 2020). Based on these expeditions, the Beneficial project (Biogeography of the northwest Pacific fauna. A benchmark study for estimations of alien invasions into the Arctic Ocean in times of rapid climate chance) was designed. The main aims of the Beneficial project were 1- digitizing the biodiversity and environmental data collected during our expeditions, 2- discovering the deep-sea biogeography and biodiversity patterns in the NW Pacific, 3- predicting the potential future distribution range shifts of key species from the NW Pacific to the Arctic Ocean under rapid climate change, and 4- compiling a novel book on the taxonomy and biogeography of the highly abundant key species. All the data, publications, and the book arising from this project provide crucial benchmarks and datasets for any deep-sea biodiversity assessment, and help predict the future status of the Arctic marine ecosystem in a changing environment (Brandt et al. 2020; Canonico et al. 2019; Saeedi et al. 2019b; Saeedi et al. 2019c; Saeedi et al. 2019d; 2020; Saeedi et al. 2019e).

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