Trenkel, Verena M; Berger, Laurent (2014): Acoustic multi-frequency indicator of four major groups on a spatial grid in the Bay of Biscay [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.833957, Supplement to: Trenkel, VM; Berger, L (2013): A fisheries acoustic multi-frequency indicator to inform on large scale spatial patterns of aquatic pelagic ecosystems. Ecological Indicators, 30, 72-79, https://doi.org/10.1016/j.ecolind.2013.02.006
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Abstract:
The first data set contains the mean and cofficient of variation (standard deviation divided by mean) of a multi-frequency indicator I derived from ER60 acoustic information collected at five frequencies (18, 38, 70, 120, and 200 kHz) in the Bay of Biscay in May of the years 2006, 2008, 2009 and 2010 (Pelgas surveys). The multi-frequency indicator was first calculated per voxel (20 m long × 5 m deep sampling unit) and then averaged on a spatial grid (approx. 20 nm × 20 nm) for five 5-m depth layers in the surface waters (10-15m, 15-20m, 20-25m, 25-30m below sea surface); there are missing values in particular in the shallowest layer. The second data set provides for each grid cell and depth layer the proportion of voxels for which the multi-frequency indicator I was indicative of a certain group of organisms. For this the following interpretation was used: I < 0.39 swim bladder fish or large gas bubbles, I = 0.39-0.58 small resonant bubbles present in gas bearing organisms such as larval fish and phytoplankton, I = 0.7-0.8 fluidlike zooplankton such as copepods and euphausiids, and I > 0.8 mackerel. These proportions can be interpreted as a relative abundance index for each of the four organism groups.
Project(s):
Basin Scale Analysis, Synthesis and Integration (EURO-BASIN)
Funding:
Seventh Framework Programme (FP7), grant/award no. 264933: Basin Scale Analysis, Synthesis and Integration
Coverage:
Median Latitude: 45.977261 * Median Longitude: -3.546102 * South-bound Latitude: 43.600000 * West-bound Longitude: -5.900000 * North-bound Latitude: 48.200000 * East-bound Longitude: -1.100000
Date/Time Start: 2006-05-02T06:48:00 * Date/Time End: 2010-05-24T17:59:00
License:
(UNKNOWN)
Size:
2 datasets
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Datasets listed in this publication series
- Trenkel, VM; Berger, L (2014): Acoustic multi-frequency indicator and coefficient of acoustic multi-frequency variations on a spatial grid in the Bay of Biscay. https://doi.org/10.1594/PANGAEA.833955
- Trenkel, VM; Berger, L (2014): Proportion of grid cell occupied by one of four acoustic groups of organisms in the Bay of Biscay. https://doi.org/10.1594/PANGAEA.833956