Seasonal Variation in Nutrients and Microalgal Community Composition in Mobile Bay, Alabama, and the Northern Gulf of Mexico (2007-2009)

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator:
DISL: Marine Microalgal Lab
Publication_Date:
Unpublished material
Title:
Seasonal Variation in Nutrients and Microalgal Community Composition in Mobile Bay, Alabama, and the Northern Gulf of Mexico (2007-2009)
Geospatial_Data_Presentation_Form:
spreadsheet
Description:
Abstract:
A transect was sampled from Mobile Bay, Alabama to 40 km offshore at monthly to bi-monthly intervals from March, 2007. Horizontal salinity gradients ranged from 8 to 18 PSU in surface waters. Temperature ranged from 16 to 32 C. Maxima in chlorophyll concentrations and total microalgae numbers were associated with maxima in nutrient concentration. Nutrient concentrations were in turn inversely correlated with salinity, indicating the importance of Mobile Bay as a source. The highest chlorophyll concentrations were found in July-August. The highest cell counts were found during a bloom of the dinoflagellate Prorocentrum minimum in March inside Mobile Bay. The community composition showed a seasonal succession from dinoflagellate- to diatom-dominance in spring, followed by mixed assemblages of chlorophytes, prasinophytes and cryptophytes in summer. There were also horizontal gradients, with dinoflagellate-dominance occurring only in Mobile Bay during the Prorocentrum. There were higher proportions of prasinophytes in Mobile Bay and higher proportions of chlorophytes offshore in the mixed-flagellate assemblage in summer.
Purpose:
The purpose of this study is to take a census of the abundance, taxonomic composition and productivity of microalgal populations over an environmental gradient of nutrient and light availability over 3 annual cycles. The shallow coastal northern U.S. Gulf of Mexico (GOM) are physically dynamic and highly productive. Microalgal populations, whose growth supports the productivity of higher trophic levels are variable with respect to composition, abundance and growth potential. Accounting for this variability is essential to development of models of trophic structure and function.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date:
20070306
Ending_Date:
20090716
Currentness_Reference:
ground condition
Status:
Progress:
In work
Maintenance_and_Update_Frequency:
As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate:
-88.2117
East_Bounding_Coordinate:
-88.0109
North_Bounding_Coordinate:
30.4374
South_Bounding_Coordinate:
29.7972
Keywords:
Theme:
Theme_Keyword_Thesaurus:
None
Theme_Keyword:
salinity
Theme_Keyword:
temperature
Theme_Keyword:
chlorophyll concentration
Theme_Keyword:
microalgae
Theme_Keyword:
nutrients
Theme_Keyword:
Bio-optics
Theme_Keyword:
absorption
Theme_Keyword:
scattering
Theme_Keyword:
attenuation
Theme_Keyword:
cell counts
Theme_Keyword:
cyanobacteria
Theme_Keyword:
prasinophytes
Theme_Keyword:
chlorophyte
Theme_Keyword:
cryptophyte
Theme_Keyword:
euglenophytes
Theme_Keyword:
chrysophytes
Theme_Keyword:
diatoms
Theme_Keyword:
dictyophytes
Theme_Keyword:
raphidophytes
Theme_Keyword:
algal bloom
Theme_Keyword:
community composition
Theme_Keyword:
abundance
Theme_Keyword:
dinoflagellate
Theme_Keyword:
assemblage
Theme_Keyword:
photosynthesis
Theme_Keyword:
phytoplankton
Theme_Keyword:
water quality
Theme_Keyword:
Chla
Theme_Keyword:
nitrogen
Theme_Keyword:
phosphorus
Theme_Keyword:
water column
Theme_Keyword:
diversity
Theme_Keyword:
density
Theme:
Theme_Keyword_Thesaurus:
ISO 19115 Topic Categories
Theme_Keyword:
environment
Theme_Keyword:
oceans
Theme_Keyword:
biota
Place:
Place_Keyword_Thesaurus:
None
Place_Keyword:
Alabama
Place_Keyword:
Mobile Bay
Place_Keyword:
Gulf of Mexico
Place_Keyword:
Dauphin Island Sea Lab
Place_Keyword:
DISL
Access_Constraints:
Permission to access these data must be given by DISL Data Management.
Use_Constraints:
Acknowledgment of the DISL: Marine Microalgal Lab is required in products developed from these data, and such acknowledgment as is standard for citation and legal practices for data source is expected by users of these data. Users should be aware that comparison with other data sets for the same area from other time periods may be inaccurate due to inconsistencies resulting from changes in mapping conventions, data collection, and computer processes over time. The distributor shall not be liable for improper or incorrect use of these data, based on the description of appropriate/inappropriate uses described in the metadata document. These data are not legal documents and are not to be used as such.
Point_of_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Dauphin Island Sea Lab
Contact_Position:
Data Management Specialist
Contact_Address:
Address_Type:
mailing and physical
Address:
101 Bienville Blvd.
City:
Dauphin Island
State_or_Province:
Al
Postal_Code:
36528
Country:
USA
Contact_Voice_Telephone:
251-861-2141
Contact_Electronic_Mail_Address:
metadata@disl.org
Hours_of_Service:
8-5:00 CST
Contact_Instructions:
Please email the metadata specialist for further information.
Data_Set_Credit:
Hugh MacIntyre and Lucie Novoveská-Brunden
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Data_Quality_Information:
Logical_Consistency_Report:
Underway: a[Λ] and b[Λ] (WETLabs ac9), GPS (Garmin), T, C, DO and Chl Fl (YSI MIDAS), CDOM fluorescence (WETLabs FL) nitrate (Satlantic ISUS). On station: Light cast (Ed[Λ] and Eu[Λ] vs depth, Satlantic MicroPro). CTD Water samples via rosette from 2-4 depths, by station. Preserve cell samples and store water at ambient temperature. Analyses of discrete samples nutrients (inorganic and organic dissolved and particulate N, P and C, silicate). Class-level taxonomic composition (HPLC pigments, light microscopy) Photosynthesis-irradiance response curves (based on 14C-bicarbonate uptake). Products Physical/chemical descriptions of water quality (T, S, nutrients) Abundance and taxonomic structure of microalgal population (including HABs). Spectrally-resolved estimates of areal primary productivity.
Completeness_Report:
Foul weather on the May and November sampling events resulted in the completion of only 10 and 5 of the 15 sites respectively. A malfunction in the winch used for sampling on the event in June prevented the entire sampling regimen to be completed. Due to high winds, three attempts were made in January 2008, however no samples were obtained. The event in March was canceled due to an emergency usage of the E.O. Wilson to look for lost instruments on the missing mooring buoy and was not able to be rescheduled due to lack of vacancy in reserving the vessel. Fowl weather prevented the cruise in mid-May, and it was rescheduled for a half day due to boat availability, therefore only site T20 was successfully sampled. The alternate day in late May was unsuccessful due to instrument communication problems. Fowl weather prevented the sampling of the station T35 and 3 intercalary stations in June, therefore 18 of the 25 sites were collected.
Lineage:
Process_Step:
Process_Description:
1) Flow-through monitoring Synchronize computers to time.gov and, where possible, initialize instruments so that they collect on the minute. For the MIDAS, collect on the minute. For instruments running through the MPak, collect 30 s records centered on the minute. 2) Sampling on station Check and record time on and off station, the GPS co-ordinates, bottom depth, T and S. Run a light cast with the MicroPro, making sure not to lower it deeper than 1 m off bottom. Run a CTD cast with the rosette, reversing when the depth reading is 1 m off bottom. Fire all the Niskin bottles at 1 m off bottom, and collect through Nitex screen into the sample bottles and place on ice in a cooler. Collect and preserve cell samples: one with paraformaldehyde, one with isopropyl and one with Lugol’s (ADPH's). Cap, mix and place in darkness as soon as possible. Wear gloves when handling the paraformaldehyde and put the samples into a cooler with ice as soon as possible. Place all paraformaldehyde-contaminated waste in a sealed Ziplock. Collect a 2nd and 3rd samples at 2/3 and 1/3 of water depth on the two offshore stations. Collect surface samples at both offshore and inshore stations and sieve through a Nitex screen into a sample bottle. 3) Sampling underway Collect a single sample from the continuous-flow system at each of the intercalary CTD stations. Record the precise collection time (use laptop), to allow match-up with optical data. These samples are for work-up of optics (Chla, aPh, aDet and aCDOM, dissolved nutrients) for ground-truthing.
Process_Date:
200807
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Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label:
Summary_FOCAL.xls
Entity_Type_Definition:
Attribute table describing physical and chemical parameters tested at various sites throughout Mobile Bay and the Gulf of Mexico.
Entity_Type_Definition_Source:
DISL: Marine Microalgal Lab
Attribute:
Attribute_Label:
Date & Time
Attribute_Definition:
The date and the Central Standard time (represented as military time) of a particular sampling event.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
20070306
Range_Domain_Maximum:
20090716
Attribute:
Attribute_Label:
Lab I.D.
Attribute_Definition:
An identification code unique to each sampling event written in the following format: Date - station ID and depth
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Unrepresentable_Domain:
Values cannot repeat. Each sampling event has a unique ID.
Attribute:
Attribute_Label:
Depth
Attribute_Definition:
Integer values have been given to depths in the following categories: MB Depth 1 = surface 2 = 3m DI Depth 1 = surface 2 = 7m 3 = 15m T20 Depth 1 = surface 2 = 6m 3 = 12m 4 = 18m T35 Depth 1 = surface 2 = 12m 3 = 24m 4 = 35m
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
1
Range_Domain_Maximum:
4
Attribute:
Attribute_Label:
Long
Attribute_Definition:
Longitudinal coordinate of sampling event
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
-88.01091667
Range_Domain_Maximum:
-88.21161667
Attribute:
Attribute_Label:
Lat
Attribute_Definition:
Latitudinal coordinate of sampling event
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
29.79715
Range_Domain_Maximum:
30.09088333
Attribute:
Attribute_Label:
T (Temp)
Attribute_Definition:
Water temperature measured in Celsius (C)
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
15.13
Range_Domain_Maximum:
32.02
Attribute:
Attribute_Label:
S (Salinity)
Attribute_Definition:
The amount of dissolved salt found in a given seawater sample measured in Practical Salinity Units (PSU).
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
7.13
Range_Domain_Maximum:
37
Attribute:
Attribute_Label:
pH
Attribute_Definition:
The measure of the acidity or alkalinity of a solution
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
7.83
Range_Domain_Maximum:
8.52
Attribute:
Attribute_Label:
Nitrate (NO3)
Attribute_Definition:
A measure of the concentration of the nitrate molecule (NO3)in µmol l^-1.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.026498107
Range_Domain_Maximum:
6.572533153
Attribute:
Attribute_Label:
Nitrate + Nitrite
Attribute_Definition:
A measure of the nitrate molecule (NO3) and the nitrite molecule (NO2) in µmol l^-1.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.006211447
Range_Domain_Maximum:
8.632852066
Attribute:
Attribute_Label:
Nitrite
Attribute_Definition:
A measure of the concentration of the nitrite molecule (NO2)in µmol l^-1.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.00373396
Range_Domain_Maximum:
1.31479182
Attribute:
Attribute_Label:
Ammonia
Attribute_Definition:
A measure of the concentration of the ammonia molecule (NH4)in µmol l^-1.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.00
Range_Domain_Maximum:
38.711447591
Attribute:
Attribute_Label:
Phosphate
Attribute_Definition:
A measure of the concentration of the phosphate molecule (P04)in µmol l^-1.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.019974674
Range_Domain_Maximum:
1.827228682
Attribute:
Attribute_Label:
Silicate
Attribute_Definition:
A measure of the concentration of the silicate molecule (SiO3)in µmol l^-1.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.172581
Range_Domain_Maximum:
60.30512638
Attribute:
Attribute_Label:
DIC (dissolved inorganic carbon)
Attribute_Definition:
A measure of the concentration of dissolved inorganic carbon in µmol l^-1.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.00
Range_Domain_Maximum:
60.30512638
Attribute:
Attribute_Label:
DOC (dissolved organic carbon)
Attribute_Definition:
A measure of the concentration of dissolved organic carbon in µmol l^-1.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.909241197
Range_Domain_Maximum:
14.11031999
Attribute:
Attribute_Label:
DOP (dissolved organic phosphorus)
Attribute_Definition:
The total amount of dissolved organic phosphorus found in a sample
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.086077645
Range_Domain_Maximum:
0.086077645
Attribute:
Attribute_Label:
DON (dissolved organic nitrogen)
Attribute_Definition:
The total amount of dissolved organic nitrogen found in a sample
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
4.795428633
Range_Domain_Maximum:
34.14129421
Attribute:
Attribute_Label:
PC (particulate carbon)
Attribute_Definition:
A measure of the concentration of particulate carbon in µmol l^-1.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
6.615185185
Range_Domain_Maximum:
406.4555556
Attribute:
Attribute_Label:
PC se (particulate carbon standard error)
Attribute_Definition:
The estimated standard deviation of the error in the method used to detect particulate carbon
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.082495791
Range_Domain_Maximum:
35.16652975
Attribute:
Attribute_Label:
PN (particulate nitrogen)
Attribute_Definition:
A measure of the concentration of particulate nitrogen in µmol l^-1.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.985714286
Range_Domain_Maximum:
27.97619048
Attribute:
Attribute_Label:
PN se (particulate nitrogen standard error)
Attribute_Definition:
The estimated standard deviation of the error in the method used to detect particulate nitrogen
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.00
Range_Domain_Maximum:
3.100636318
Attribute:
Attribute_Label:
PP (particulate phosphorus)
Attribute_Definition:
A measure of the concentration of particulate phosphorus in µmol l^-1.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.027450767
Range_Domain_Maximum:
3.109809254
Attribute:
Attribute_Label:
PP se (particulate phosphorus standard error)
Attribute_Definition:
The estimated standard deviation of the error in the method used to detect particulate phosphorus
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.000327564
Range_Domain_Maximum:
0.185435123
Attribute:
Attribute_Label:
Chl
Attribute_Definition:
The amount of chlorophyll a measured in µg l^-1.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.21
Range_Domain_Maximum:
35.55555556
Attribute:
Attribute_Label:
Chl se
Attribute_Definition:
The estimated standard deviation of the error in the method used to detect chlorophyll a
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0.001154701
Range_Domain_Maximum:
1.152935063
Attribute:
Attribute_Label:
Cyano
Attribute_Definition:
A measure of the number of cyanobacteria per sample.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0
Range_Domain_Maximum:
2410000
Attribute:
Attribute_Label:
Chloro
Attribute_Definition:
A measure of the number of chlorophytes per sample.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0
Range_Domain_Maximum:
1000000
Attribute:
Attribute_Label:
Prasino
Attribute_Definition:
A measure of the number of prasinophytes per sample.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0
Range_Domain_Maximum:
780000
Attribute:
Attribute_Label:
Eugleno
Attribute_Definition:
A measure of the number of euglenophytes per sample.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0
Range_Domain_Maximum:
39000
Attribute:
Attribute_Label:
Chryso
Attribute_Definition:
A measure of the number of chrysophytes per sample.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0
Range_Domain_Maximum:
170000
Attribute:
Attribute_Label:
Crypto
Attribute_Definition:
A measure of the number of cryptophytes per sample.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0
Range_Domain_Maximum:
1000000
Attribute:
Attribute_Label:
Bacillario
Attribute_Definition:
A measure of the number of bacillariophytes per sample.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0
Range_Domain_Maximum:
1406300
Attribute:
Attribute_Label:
Fragilario
Attribute_Definition:
A measure of the number of fragilariophytes per sample.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0
Range_Domain_Maximum:
124600
Attribute:
Attribute_Label:
Coscinodisco
Attribute_Definition:
A measure of the number of coscinodiscophycea per sample.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0
Range_Domain_Maximum:
1903810
Attribute:
Attribute_Label:
Diato
Attribute_Definition:
A measure of the number of diatoms per sample.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0
Range_Domain_Maximum:
3261010
Attribute:
Attribute_Label:
Dictyo
Attribute_Definition:
A measure of the number of dictyophytes per sample.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0
Range_Domain_Maximum:
35000
Attribute:
Attribute_Label:
Raphido
Attribute_Definition:
A measure of the number of raphidohytes per sample.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0
Range_Domain_Maximum:
85000
Attribute:
Attribute_Label:
Dino
Attribute_Definition:
A measure of the number of dinoflagellates per sample.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0
Range_Domain_Maximum:
15010820
Attribute:
Attribute_Label:
Unid
Attribute_Definition:
A measure of the number of unidentified species per sample.
Attribute_Definition_Source:
DISL: Marine Microalgal Lab
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum:
0
Range_Domain_Maximum:
12000
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Dauphin Island Sea Lab
Contact_Position:
Data Management Specialist
Contact_Address:
Address_Type:
mailing and physical
Address:
101 Bienville Blvd.
City:
Dauphin Island
State_or_Province:
Al
Postal_Code:
36528
Country:
USA
Contact_Voice_Telephone:
251-861-2141
Contact_Electronic_Mail_Address:
metadata@disl.org
Hours_of_Service:
8-5:00 CST
Contact_Instructions:
Please email the metadata specialist for further information.
Resource_Description:
FOCAL nutrient and microalgal data
Distribution_Liability:
The Dauphin Island Sea Lab's Marine Microalgal Lab makes no warranty regarding these data, expressed or implied, nor does the fact of distribution constitute such a warranty. The Marine Microalgal Lab cannot assume liability for any damages caused by any errors or omissions in these data, nor as a result of the failure of these data to function on a particular system.
Technical_Prerequisites:
Customer must have software capable of reading files created in Microsoft Excel 2007.
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Metadata_Reference_Information:
Metadata_Date:
20101028
Metadata_Contact:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization:
Dauphin Island Sea Lab
Contact_Position:
Data Management Specialist
Contact_Address:
Address_Type:
mailing and physical
Address:
101 Bienville Blvd.
City:
Dauphin Island
State_or_Province:
Al
Postal_Code:
36528
Country:
USA
Contact_Voice_Telephone:
251-861-2141
Contact_Electronic_Mail_Address:
metadata@disl.org
Hours_of_Service:
8-5:00 CST
Contact_Instructions:
Please email the metadata specialist for further information.
Metadata_Standard_Name:
FGDC Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version:
FGDC-STD-001-1998
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