EMAP CP94-95

• Main Author: Hyland
• Format: Dataset
• Language: English
• Published: KNB Data Repository 2004
• Subjects: demersal trawls; demersal community; mean number of taxa; species composition; Weaver; Orca
• Online Access: https://dx.doi.org/10.5063/aa/shale.3.1; https://knb.ecoinformatics.org/view/doi:10.5063/AA/shale.3.1

The CP_DEM_A.DAT, CP_DEM_S.TXT, CP_DEM_L.DAT, CP_DEM_C.DAT data sets contain demersal trawl data collected at each station in the EMAP Carolinian Province from 1994-1995. Fishes and invertebrates (shrimp, crabs, and squid) were collected at each station with a 4.9-m otter trawl (2.5 cm mesh wings and cod end) towed against the tidal currents. Tow duration was 10 min wherever possible and tow speed was 2-3 knots. Two to four tows were conducted at each station. Fishes and invertebrates captured in the trawls were carefully removed, sorted and identified to the lowest possible taxon (usually to species), enumerated, and measured for length to the nearest mm. In cases where a species was caught in excessive numbers, a minimum subsample of 30 individuals was measured for length. The CP_DEM_A.DAT data set contains unsummarized demersal abundance data by trawl and taxon. This data set is for use as the data source for subsequent demersal trawl analyses and summary calculations (e.g., CP_DEM_L.DAT, CP_DEM_C.DAT are calculated from the data in CP_DEM_A.DAT). The CP_DEM_S.TXT data set contains taxonomic classification information for all demersal taxa observed in trawls throughout the Carolinian Province from 1994-1995. This data set is essential to resolve actual taxonomy and species names from the 8 digit code (variable COD_EMAP) used to identify taxa in the CP_DEM_A.DAT and CP_DEM_L.DAT data sets. Taxonomic information includes: phylum, class, order, family, genus, species, and common name. The CP_DEM_L.DAT data set contains demersal organism length data summarized by station and taxon. Summary results included are: number of lengths measured, mean length, and standard deviation of lengths, by taxon for each station. The CP_DEM_C.DAT data set contains summary metrics used to describe the demersal community at a station. The summary results included are: number of trawls, mean number of demersal taxa (species richness) per trawl, mean demersal abundance per trawl, and Shannon-Weaver Index (H' diversity) per trawl, for each station. The following reports are products of these and other data collected during the 1994-1995 Sampling period in the Carolinian Province. These reports may contain additional information and summary statistics that are not contained in this data set catalog or its respective data sets. We therefore recommend referring to them when using these data. Hyland, J.L., T.J. Herrlinger, T.R. Snoots, A.H. Ringwood, R.F. Van Dolah, C.T. Hackney, G.A. Nelson, J.S. Rosen, and S.A. Kokkinakis. 1996. Environmental quality of estuaries of the Carolinian Province: 1994. Annual statistical summary for the 1994 EMAP-Estuaries Demonstration Project in the Carolinian Province. NOAA Technical Memorandum NOS ORCA 97. NOAA/NOS, Office of Ocean Resources Conservation and Assessment, Silver Spring, MD. 102 p. Hyland, J.L., L. Balthis, C.T. Hackney, G. McRae, A.H. Ringwood, T.R. Snoots, R.F. Van Dolah, and T.L. Wade. 1998. Environmental quality of estuaries of the Carolinian Province: 1995. Annual statistical summary for the 1995 EMAP-Estuaries Demonstration Project in the Carolinian Province. NOAA Technical Memorandum NOS ORCA 123 NOAA/NOS, Office of Ocean Resources Conservation and Assessment, Silver Spring, MD. 143 p. See also: McRae and Nelson (1996), Nelson (1995), Ringwood et al.(1995), Ringwood et al. (1997), Wheeler et al.(1995), Wheeler et al. (1996).