d15N and d13C isotopic ratios from multiple groundfish and groundfish prey samples collected on groundfish surveys and by fishery observers onboard commercial fishing vessels in the eastern Bering Sea, and Gulf of Alaska from 2006 through 2008 via NPRB project, NPRB.2006.22.Isotopes, and continued by AFSC.
Purpose:
This research proposed to further define and understand the marine ecosystems that involve commercially important groundfish in the Bering Sea, Aleutian Islands and Gulf of Alaska.
Access_Constraints: All data collected by observers are confidential under the Magnuson-Stevens Fishery Conservation and Management Act; as amended, Public Law 109-479; 16 U.S.C. 1853; implemented at 50 CFR 679.50. Therefore unprocessed (raw) observer data can be shared only with authorized persons; however aggregated forms of the data are generally available. In this data set vessel, cruise, lat, lon, gear depth, bottom depth, month, day fields within the table have been set to null for observer collected data to ensure anonymity of data collection source except Year, Region, and Hauljoin (which maintains relational integrity to the predprey and prey len tables)
Use_Constraints:
Must cite originator if used in publications, reports, presentations, etc.
Contact_Organization: National Oceanic and Atmospheric Administration (NOAA) Alaska Fisheries Science Center (AFSC) Resource Ecology and Fisheries Management Division (REFM)
Sample collection, freezing and drying protocols are described in manuals below. Dried sample mass was measured by trained laboratory personnel to a precision of 0.001mg ±0.0015mg. Samples were analyzed for d15N, d13C, %C, %N, and C/N, in continuous-flow mode using a Thermo-Finnigan Deltaplus Advantage gas isotope-ratio mass spectrometer interfaced with a Costech Analytical ECS4010 elemental analyzer. Data are normalized using 4 internationally-accepted isotope reference standards (IAEA CH6, CH7, N1, and N2). The main working standard is peach leaves (NIST 1547). External precision on these standards is ± 0.10‰ or better for d13C and ± 0.20‰ or better for d15N
Logical_Consistency_Report:
10% of tissue samples were sub-sampled and isotopic signatures measured twice to determine measurement variance. Peak amplitude and variance were recorded and sample results falling outside of the range of the machine were discarded.
Completeness_Report:
This data set was a combination of data collected by scientific personnel onboard Alaska Fisheries Science Center surveys and by fishery observers onboard commercial fishing vessels in the eastern Bering Sea and Gulf of Alaska as opportunity arose.
A numeric field that does not accept null values, acceptable values are any unique integer, this is the primary key for the table.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 2119
Attribute_Units_of_Measure: Integer
Attribute:
Attribute_Label: ID_1
Attribute_Definition:
A numeric field that does not accept null values, identifies a given sample.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 100a
Range_Domain_Maximum: m99
Attribute_Units_of_Measure: AlphaNumeric
Attribute:
Attribute_Label: PairMatch
Attribute_Definition:
A text field that indicates the integer portion of ID_1 of a matched pair of tissue samples (matching different tissue types from the same fish), acceptable values the integer value of ID_1 and NONE.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: ID_1
Enumerated_Domain_Value_Definition:
See the attribute definition
Enumerated_Domain_Value_Definition_Source:
Kerim Aydin
Enumerated_Domain:
Enumerated_Domain_Value: None
Enumerated_Domain_Value_Definition:
See the attribute definition
Enumerated_Domain_Value_Definition_Source:
Kerim Aydin
Attribute:
Attribute_Label: Species
Attribute_Definition:
A text field indicating the species from which a sample was collected.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Unrepresentable_Domain:
unknown
Attribute:
Attribute_Label: Length(mm)
Attribute_Definition:
A numeric field indicating specimen length, acceptable values are any numeric value.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 6.9
Range_Domain_Maximum: 1420
Attribute_Units_of_Measure: mm
Attribute:
Attribute_Label: Tissue
Attribute_Definition:
A text field indicating tissue type, accaptable values are MUSCLE, LIVER, NEITHER.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: Muscle
Enumerated_Domain_Value_Definition:
See the attribute definition
Enumerated_Domain_Value_Definition_Source:
Kerim Aydin
Enumerated_Domain:
Enumerated_Domain_Value: Liver
Enumerated_Domain_Value_Definition:
See the attribute definition
Enumerated_Domain_Value_Definition_Source:
Kerim Aydin
Enumerated_Domain:
Enumerated_Domain_Value: Neither
Enumerated_Domain_Value_Definition:
See the attribute definition
Enumerated_Domain_Value_Definition_Source:
Kerim Aydin
Attribute:
Attribute_Label: Haul
Attribute_Definition:
A numeric field indicating haul number from which the sample was collected, acceptable values are any integer
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 3
Range_Domain_Maximum: 860
Attribute_Units_of_Measure: Integer
Attribute:
Attribute_Label: Vessel
Attribute_Definition:
A text field indicating the vessel code from which the sample was collected, acceptable values are any integer, this is set to null for observer collected samples.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 21
Range_Domain_Maximum: 143
Attribute_Units_of_Measure: Integer
Attribute:
Attribute_Label: Cruise
Attribute_Definition:
A numeric field indicating the cruise from which the sample was collected, acceptable values are any integer, this is set to null for observer collected samples.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 200501
Range_Domain_Maximum: 200801
Attribute_Units_of_Measure: Integer
Attribute:
Attribute_Label: Region
Attribute_Definition:
A text field indicating region from which the sample was collected, acceptable values are B for Bering Sea, G for Gulf of Alaska, and null.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: G
Enumerated_Domain_Value_Definition:
See the attribute definition
Enumerated_Domain_Value_Definition_Source:
Kerim Aydin
Enumerated_Domain:
Enumerated_Domain_Value: B
Enumerated_Domain_Value_Definition:
See the attribute definition
Enumerated_Domain_Value_Definition_Source:
Kerim Aydin
Attribute:
Attribute_Label: Lat
Attribute_Definition:
A numeric field containing Latitude (dd.dd), this is set to null for observer collected samples.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 51.68
Range_Domain_Maximum: 62.0
Attribute_Units_of_Measure: Latitude
Attribute:
Attribute_Label: Lon
Attribute_Definition:
A numeric field containing Longitude (dd.dd), this is set to null for observer collected samples.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 173.26
Range_Domain_Maximum: 226.23
Attribute_Units_of_Measure: Longitude
Attribute:
Attribute_Label: Date
Attribute_Definition:
A date field indicating the date that the sample was collected,
acceptable values are date or NULL, this is set to null for observer collected samples.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Unrepresentable_Domain:
unknown
Attribute:
Attribute_Label: Year
Attribute_Definition:
A numeric field that indicates the year the sample was collected, acceptable values are any integer.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2005
Range_Domain_Maximum: 2008
Attribute_Units_of_Measure: Integer
Attribute:
Attribute_Label: Gear_depth
Attribute_Definition:
A numeric field containing gear depth (m) of the haul from which the sample was collected, this is set to null for observer collected samples.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 1178
Attribute_Units_of_Measure: m
Attribute:
Attribute_Label: Bottom_depth
Attribute_Definition:
A numeric field containing botttom depth (m) of the haul from which the sample was collected, set to null for observer collected samples.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 0
Range_Domain_Maximum: 1184
Attribute_Units_of_Measure: m
Attribute:
Attribute_Label: Haul_type
Attribute_Definition:
A numeric field that indicates haul type, acceptable values are NULL, 1 for off-bottom haul, 3 for bottom haul.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 3
Attribute_Units_of_Measure: Integer
Attribute:
Attribute_Label: Mass
Attribute_Definition:
A numeric field that indicates the dry weight (g) of the tissue sample as submitted to isotopic analysis, acceptable values are numeric > 0, or NULL if not available.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: .6
Range_Domain_Maximum: 1.2
Attribute_Units_of_Measure: g
Attribute:
Attribute_Label: CO2 Ampl
Attribute_Definition:
A numeric field, or NULL if not available, containing the amplitude of the C02 peak (volts) from the mass spectrometer, useful for debugging isotopic outliers outside the working range of the instrument.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1.54
Range_Domain_Maximum: 14.318
Attribute_Units_of_Measure: Volts
Attribute:
Attribute_Label: N2 Ampl
Attribute_Definition:
A numeric field, or NULL if not available, containing the amplitude of the N2 peak (volts) from the mass spectrometer, useful for debugging isotopic outliers outside the working range of the instrument.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: .19
Range_Domain_Maximum: 13.361
Attribute_Units_of_Measure: Volts
Attribute:
Attribute_Label: CO2 Area
Attribute_Definition:
A numeric field, or NULL if not available, containing the area of the C02 peak (volts/sec) from the mass spectrometer, useful for debugging isotopic outliers outside the working range of the instrument.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 37.633
Range_Domain_Maximum: 351.981
Attribute_Units_of_Measure: volts/sec
Attribute:
Attribute_Label: N2 Area
Attribute_Definition:
A numeric field, or NULL if not available, containing the area of the N2 peak (volts/sec) from the mass spectrometer, useful for debugging isotopic outliers outside the working range of the instrument.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 4.08
Range_Domain_Maximum: 279.314
Attribute_Units_of_Measure: volts/sec
Attribute:
Attribute_Label: d13C
Attribute_Definition:
A numeric field containing the isotopic ratio (d13C) of 13C to 12C in dried tissue samples, as difference (parts per thousand) from reference samples.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: -29.54
Range_Domain_Maximum: -14.29
Attribute_Units_of_Measure: ppt
Attribute:
Attribute_Label: d15N
Attribute_Definition:
A numeric field containing the isotopic ratio (d15N) of 15N to 14N in dried tissue samples, as difference (parts per thousand) from reference samples.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 6.56
Range_Domain_Maximum: 20.41
Attribute_Units_of_Measure: ppt
Attribute:
Attribute_Label: perC
Attribute_Definition:
A numeric field, or NULL if not available, containing the percent by weight of carbon in the dried tissue sample.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 19.2
Range_Domain_Maximum: 185.75
Attribute_Units_of_Measure: percent weight
Attribute:
Attribute_Label: perN
Attribute_Definition:
A numeric field, or NULL if not available, containing the percent by weight of nitrogen in the dried tissue sample.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: .57
Range_Domain_Maximum: 27.03
Attribute_Units_of_Measure: percent weight
Attribute:
Attribute_Label: C_N
Attribute_Definition:
A numeric field, or NULL if not available, containing the ratio of carbon to nitrogen by weight in the dried tissue sample.
Attribute_Definition_Source:
AFSC
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 2.71
Range_Domain_Maximum: 114.0
Attribute_Units_of_Measure: ratio numeric
Overview_Description:
Entity_and_Attribute_Overview:
d15N and d13C isotopic ratios from multiple groundfish and groundfish prey samples collected on groundfish surveys and by fishery observers onboard commercial fishing vessels in the eastern Bering Sea, and Gulf of Alaska from 2006 through 2008. Measurements are species, individual length, and collection location; isotopic data is for dried samples and is percent Carbon, percent Nitrogen, C/N ratio by weight, and d15N and d13C isotopic ratios
Contact_Organization: National Oceanic and Atmospheric Administration (NOAA) Alaska Fisheries Science Center (AFSC) Resource Ecology and Fisheries Management Division (REFM)