1994 and 1998 fishery-independent trawl data from the Southern California Coastal Water Research Project (SCCWRP) was used to calculate mean fish diversity. The dataset contains information from 425 trawls at depths of 2-215 meters, identifying 150 fish species to the species level. Data was aggregated into 5 x 5 minute grid cells, with the Shannon Index of diversity calculated for each cell.
Use Cases
- Mapping marine biodiversity hotspots based on the Shannon Index values for grid cells.
- Analyzing fish community composition changes with depth using trawl data from 2-215 meters.
- Modeling historical baseline fish diversity for southern California coastal waters using 1994 and 1998 data.
- Assessing the spatial distribution of 150 identified fish species across the nearshore region.
Strengths
- Data is derived from 425 fishery-independent trawls, providing a substantial sample size.
- Includes 150 fish species identified to the species level, offering detailed taxonomic resolution.
- Spatial aggregation into 5 x 5 minute grid cells provides a standardized geospatial unit for analysis.
Limitations
- Data collection is limited to two years (1994 and 1998) and three summer months (June-August), which may not represent annual or seasonal variability.
- Column-level documentation is absent; field semantics must be inferred after download.
- Data may reflect geographic and temporal bias inherent to the specific trawl survey methods and locations.
Provenance
- Source
- Southern California Coastal Water Research Project (SCCWRP), processed by NOAA_NCEI.
- Collection Method
- Fish trawl surveys using a 7.6-m head-rope semi balloon otter trawl with 1.25 cm codend mesh, towed for 5-10 minutes per station.
- Time Range
- 1994 and 1998 (specifically June-August).
- Geography
- Southern California nearshore marine waters.