Megafauna density, functional traits, diversity indices and habitat features observed at stations N3, HG-IV and S3 of the HAUSGARTEN observatory in 2016-2021
Description
Megafauna density, functional traits, diversity indices and habitat features observed at stations N3, HG-IV and S3 of the HAUSGARTEN observatory in consecutive years from 2016 to 2021 based on image surveys. Data presented here are densities (individuals m^-2) for each megafauna taxon, functional trait modality and habitat feature per image. Files contain four sheets: megafauna density observations (density) with year of observation (year), station (station), filename (filename), image area (area), user name of each taxa (user_name), scientific name (scientific_name), accepted name (accepted_name), specification (specification), AphiaID (AphiaID) and density of each megafauna taxa/morphotype; density of functional traits (functional traits) with year of observation (year), station (station), filename (filename), image area (area), trait appreviation (trait, ZO: Zoogeography, FE: Feeding type, MO: Mobility type, SU: Substratum affinity, SI: Size class), trait modality (trait modality) and density of each trait modality (density); diversity indices (diversity) with year of observation (year), station (station), filename (filename), image area (area), diversity indice (indice, H: Shannon-Wiener diversity; J: Pielou's Evenness, S: Species number, total_species: total species per year and station), value (value); density of habitat features (habitat features) with year of observation (year), station (station), filename (filename), habitat feature (feature) and density (density). Raw image data is available on PANGAEA (see related links).
Files
Steps to reproduce
Data within this dataset was collected with the Ocean Floor Observation System (OFOS) in 2016 - 2019 and with the Ocean Floor Observation and Bathymetry System (OFOBS) in 2020 and 2021 (see Purser et al. 2018 for technological details on OFOBS). Image surveys were conducted each year along a pre set transect with automatically triggered images every 20 seconds. For the analysis, 100 images per transect and year were selected and annotated to the lowest possible taxonomic level for megafauna density and habitat feature density using the software biigle.de. The area of each image was calculated based on the known distance (50 cm) between the three laserpoints visible in each image.