Sea Lion Diet Data
Southwest Fisheries Science Center
Data Set
(DS)
| ID: 30917
| Published / External
Created: 2016-02-25
|
Last Modified: 2023-05-30
Project (PRJ) | ID: 30590
ID: 30917
Data Set (DS)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | Sea Lion Diet Data |
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Short Name | Sea Lion Diet Data |
* Status | In Work |
Creation Date | 1981 |
Revision Date | |
• Publication Date | |
* » Abstract |
California sea lions pup and breed at four of the nine Channel Islands in southern California. Since 1981, SWFSC MMTD has been conducting a diet study of sea lions at San Clemente Island (a small rookery) and San Nicolas Island (a large rookery). Information on the diet of sea lions is obtained from analyzing scats (i.e., fecal samples) and spewings (i.e., vomitus) collected at those two rookeries in January (winter), April (spring), July (summer), and October (autumn). Otoliths (a crystalline structure within the ear organ) from fish and beaks (mandibles composed of chitin) from cephalopods are recovered from the samples by washing each sample through sieves of varying mesh size. Otoliths and beaks, which are shaped and sized differently for each species of fish and cephalopod, respectively, are used to identify and enumerate fish, and cephalopods consumed by sea lions. Also, otoliths and beaks are measured for estimating size of prey being consumed by sea lions. |
* Purpose |
The objectives of the sea lion diet study being conducted are to: 1) Identify prey species being consumed by sea lions in order to determine which are most important to the sea lion population. Prey species are identified by hard parts, such as fish otoliths and squid beaks found in scats. See the recently published Photographic Catalog of California Marine Fish Otoliths: Prey of California Sea Lions (Zalophus californianus). 2) Monitor seasonal, annual, and multi-year variability in consumption of prey species. 3) Determine if dietary changes can be used to signal when the population reaches carrying capacity, 4) Estimate consumption by the sea lion population. 5) Use sea lion diet data as a fishery-independent index of abundance for commercial species of fish and squid. |
Notes | |
Other Citation Details | |
• Supplemental Information | |
DOI (Digital Object Identifier) | |
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DOI Issue Date |
Keywords
Theme Keywords
Thesaurus | Keyword |
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ISO 19115 Topic Category | biota |
ISO 19115 Topic Category | oceans |
None | abundance |
None | California Sea Lion |
None | diet |
None | ecosystems |
None | habitat |
None | pinniped |
None | rookeries |
None | scats |
None | spewings |
Temporal Keywords
Thesaurus | Keyword |
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None | autumn |
None | spring |
None | summer |
None | winter |
* Spatial Keywords
Thesaurus | Keyword |
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None | California |
None | San Clemente Island |
None | San Nicolas Island |
None | United States |
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Physical Location
• » Organization | Southwest Fisheries Science Center |
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• » City | La Jolla |
• » State/Province | CA |
• Country | USA |
• » Location Description |
Data Set Information
* Data Set Scope Code | Data Set |
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• Data Set Type | Access Database, spreadsheets |
• Maintenance Frequency | As Needed |
Maintenance Note | |
» Data Presentation Form | Table (digital) |
• Entity Attribute Overview | |
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Distribution Liability | |
Data Set Credit |
Support Roles
* » Support Role | Data Steward |
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* » Date Effective From | 2016-02-16 |
Date Effective To | |
Person | Lowry, Mark S |
Address |
8901 La Jolla Shores Dr La Jolla, CA 92037 USA |
Email Address | Mark.Lowry@noaa.gov |
Phone | (858) 546-7174 |
Fax | (858) 546-7003 |
Mobile | |
URL | |
Business Hours | M-F 6:30 - 16:00 |
Contact Instructions |
Other data management and support staff are involved with data at the entity level and will be documented there as well. |
* » Support Role | Distributor |
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* » Date Effective From | 2016 |
Date Effective To | |
Organization | Southwest Fisheries Science Center (SWFSC) |
Address |
8901 La Jolla Shores Dr. La Jolla, CA 92037 USA |
Email Address | |
Phone | (858)546-7000 |
Fax | |
Mobile | |
URL | http://swfsc.noaa.gov/ |
Business Hours | 8:00-16:30 |
Contact Instructions |
Unknown |
* » Support Role | Metadata Contact |
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* » Date Effective From | 2016-02-16 |
Date Effective To | |
Person | Moore, Thomas J |
Address |
8901 La Jolla Shores Dr La Jolla, CA 92037 USA |
Email Address | thomas.j.moore@noaa.gov |
Phone | (858) 546-7088 |
Fax | (858) 546-7003 |
Mobile | |
URL | |
Business Hours | M-F 9:00 - 18:00 |
Contact Instructions |
* » Support Role | Point of Contact |
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* » Date Effective From | 2016-02-17 |
Date Effective To | |
Person | Moore, Jeff E |
Address |
8901 La Jolla Shores Dr La Jolla, CA 92037 USA |
Email Address | Jeff.E.Moore@noaa.gov |
Phone | (858) 546-7161 |
Fax | (858) 546-7003 |
Mobile | |
URL | |
Business Hours | M-F 8:00 - 16:00 |
Contact Instructions |
* » Support Role | Point of Contact |
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* » Date Effective From | 2016-02-16 |
Date Effective To | |
Person | Lowry, Mark S |
Address |
8901 La Jolla Shores Dr La Jolla, CA 92037 USA |
Email Address | Mark.Lowry@noaa.gov |
Phone | (858) 546-7174 |
Fax | (858) 546-7003 |
Mobile | |
URL | |
Business Hours | M-F 6:30 - 16:00 |
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Extents
Currentness Reference | Ground Condition |
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Extent Group 1
Extent Description |
San Nicolas Island |
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Extent Group 1 / Geographic Area 1
* » W° Bound | -119.58 |
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* » E° Bound | -119.43 |
* » N° Bound | 33.29 |
* » S° Bound | 33.21 |
* » Description |
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Extent Group 1 / Time Frame 1
* » Time Frame Type | Continuing |
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* » Start | 1981 |
End | |
Alternate Start As Of Info | |
Alternate End As Of Info | |
Description |
January (winter), April (spring), July (summer), October (autumn) |
Extent Group 2
Extent Description |
San Clemente Island |
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Extent Group 2 / Geographic Area 1
* » W° Bound | -118.61 |
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* » E° Bound | -118.35 |
* » N° Bound | 33.04 |
* » S° Bound | 32.797 |
* » Description |
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Extent Group 2 / Time Frame 1
* » Time Frame Type | Continuing |
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* » Start | 1981 |
End | |
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Alternate End As Of Info | |
Description |
January (winter), April (spring), July (summer), October (autumn) |
Spatial Information
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Access Information
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Data License Statement | |
* » Security Class | Unclassified |
* Security Classification System | |
Security Handling Description | |
• Data Access Policy | |
» Data Access Procedure |
When resources are available to make data accessible; in interim, contact SWFSC MMTD. |
• » Data Access Constraints |
FISMA Controls are in place to protect stored data from unauthorized access and/or disclosure. |
• Data Use Constraints |
User must read and fully comprehend the metadata prior to use. Acknowledgement of NOAA SWFSC, as the source from which these data were obtained, in any publications and/or other representations of these data is requested. The user is responsible for the results of any application of these data for other than its intended purpose. |
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Distribution Information
Start Date | 2019-05-30 |
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End Date | Present |
» Download URL | http://swfsc.noaa.gov/ |
Distributor | Southwest Fisheries Science Center (SWFSC) (2016 - Present) |
File Name | |
Description |
spreadsheet and database of scat/diet samples |
File Date/Time | |
File Type (Deprecated) | Mixed |
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Review Status |
Start Date | 2019-05-30 |
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End Date | Present |
» Download URL | https://swfsc.noaa.gov/mmtd |
Distributor | Southwest Fisheries Science Center (SWFSC) (2016 - Present) |
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Data are not currently available for download. |
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Data Quality
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data representative of animals feeding within distance of the collection sites on Channel Islands |
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» Quality Control Procedures Employed |
All data have been entered carefully and double-checked by a single PI |
Data Management
» Have Resources for Management of these Data Been Identified? | No |
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» Approximate Percentage of Budget for these Data Devoted to Data Management | Unknown |
» Do these Data Comply with the Data Access Directive? | No |
» Is Access to the Data Limited Based on an Approved Waiver? | No |
» If Distributor (Data Hosting Service) is Needed, Please Indicate | Yes |
» Approximate Delay Between Data Collection and Dissemination | Unknown |
» If Delay is Longer than Latency of Automated Processing, Indicate Under What Authority Data Access is Delayed | |
» Actual or Planned Long-Term Data Archive Location | NCEI-CO |
» Approximate Delay Between Data Collection and Archiving | Unknown |
» How Will the Data Be Protected from Accidental or Malicious Modification or Deletion Prior to Receipt by the Archive? |
FISMA Controls are in place to protect stored data from unauthorized access. Data are backed up on a daily basis on a local area network and, in some cases, external hard drives as well. Data are also backed up to tape and stored at a remote site for retrieval in case recovery is needed from these off-site media. |
Lineage
» Lineage Statement |
Scat samples collected in field are stored in freezer, then thawed prior to processing. Each scat sample is given a code number, then washed through sieves from which hard-parts (fish otoliths and cephalopod beaks) are collected. Prey identified and enumerated from prey hard-parts. Data entered onto Microsoft Excel worksheets, then transferred to Microsoft Access database. Queries are used to extract data for analysis. "Analyze program" written by Robert Holland summarizes queried data. |
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Acquisition Information
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Instrument Unavailable Reason | Not Applicable |
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Rubric scores updated every 15m
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Catalog Details
Catalog Item ID | 30917 |
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Metadata Record Created By | Thomas J Moore |
Metadata Record Created | 2016-02-25 00:23+0000 |
Metadata Record Last Modified By | SysAdmin InPortAdmin |
» Metadata Record Last Modified | 2023-05-30 18:09+0000 |
Metadata Record Published | 2016-02-25 |
Owner Org | SWFSC |
Metadata Publication Status | Published Externally |
Do Not Publish? | N |
Metadata Workflow State | Published / External |
Metadata Last Review Date | 2016-02-25 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2017-02-25 |
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