Temporally varying natural mortality: sensitivity of a simple virtual population analysis and an exploration of alternatives
Southwest Fisheries Science Center
Document
(DOC)
| ID: 24232
| Published / External
Created: 2015-03-30
|
Last Modified: 2022-08-09
Project (PRJ) | ID: 24231
ID: 24232
Document (DOC)
* Discovery• First Pass
» Metadata Rubric
Item Identification
* » Title | Temporally varying natural mortality: sensitivity of a simple virtual population analysis and an exploration of alternatives |
---|---|
Short Name | |
* Status | Completed |
Creation Date | |
Revision Date | |
• Publication Date | |
* » Abstract |
Cohort reconstructions currently applied in Pacific salmon management estimate temporally variant exploitation, maturation, and juvenile natural mortality rates but require assumed (typically invariant) values of adult natural mortality, resulting in unknown biases in the remaining vital rates and precluding studies of factors influencing adult natural mortality rates. We explored the sensitivity of cohort reconstruction results to misspecification of mean mortality rate and to the amount of variability around the mean. Under the common assumption of adult natural mortality of 20%, error (RMSE) in estimated vital rates is generally small (<= 0.05) when adult natural mortality rates are low to moderate (<= 40%). The greatest error is in maturation rates, as well as relative error in juvenile survival/age 2 abundance. The ability of cohort reconstruction methods to estimate temporal patterns in juvenile natural mortality is adequate (rho > 0.75) except in the case of high adult natural mortality (>= 60%) coupled with high variability (CV >= 0.40). Simulations suggest alternative methods that allow estimation of adult natural mortality rates perform well only when assumptions of shared year and age effects are met and rates are time variant. |
* Purpose |
Draft manuscript intended for publication in Natural Resource Modeling. |
Notes | |
Other Citation Details | |
• Supplemental Information | |
DOI (Digital Object Identifier) | |
DOI Registration Authority | |
DOI Issue Date |
Keywords
Theme Keywords
Thesaurus | Keyword |
---|---|
None | age- and time-dependent models |
None | cohort reconstruction |
None | fisheries management |
None | natural mortality |
None | virtual population analysis |
Temporal Keywords
Thesaurus | Keyword |
---|---|
* Spatial Keywords
Thesaurus | Keyword |
---|---|
Stratum Keywords
Thesaurus | Keyword |
---|---|
Instrument Keywords
Thesaurus | Keyword |
---|---|
Platform Keywords
Thesaurus | Keyword |
---|---|
Physical Location
• » Organization | Southwest Fisheries Science Center |
---|---|
• » City | Santa Cruz |
• » State/Province | CA |
• Country | USA |
• » Location Description |
Document Information
Document Type | Report |
---|---|
Format | Acrobat Portable Document Format |
Format Version | |
Status Code | Draft |
Support Roles
* » Support Role | |
---|---|
* » Date Effective From | |
Date Effective To | |
* » Contact | |
* Contact Instructions |
* » Support Role | |
---|---|
* » Date Effective From | |
Date Effective To | |
* » Contact | |
* Contact Instructions |
* » Support Role | |
---|---|
* » Date Effective From | |
Date Effective To | |
* » Contact | |
* Contact Instructions |
Extents
Currentness Reference |
---|
Extent Group 1
Extent Description |
---|
Extent Group 1 / Geographic Area
* » W° Bound | |
---|---|
* » E° Bound | |
* » N° Bound | |
* » S° Bound | |
* » Description |
Extent Group 1 / Vertical Extent
EPSG Code | |
---|---|
Vertical Minimum | |
Vertical Maximum |
Extent Group 1 / Time Frame
* » Time Frame Type | |
---|---|
* » Start | |
End | |
Alternate Start as of Info | |
Alternate End as of Info | |
Description |
Access Information
* » Security Class | |
---|---|
* Security Classification System |
|
Security Handling Description |
|
• Data Access Policy |
|
» Data Access Procedure |
|
• » Data Access Constraints |
|
• Data Use Constraints |
|
Metadata Access Constraints |
|
Metadata Use Constraints |
|
Distribution Information
Start Date | |
---|---|
End Date | |
» Download URL | |
Distributor | |
File Name | |
Description | |
File Date/Time | |
File Type | |
FGDC Content Type | |
File Size | |
Application Version | |
Compression | |
Review Status |
Start Date | |
---|---|
End Date | |
» Download URL | |
Distributor | |
File Name | |
Description | |
File Date/Time | |
File Type | |
FGDC Content Type | |
File Size | |
Application Version | |
Compression | |
Review Status |
Start Date | |
---|---|
End Date | |
» Download URL | |
Distributor | |
File Name | |
Description | |
File Date/Time | |
File Type | |
FGDC Content Type | |
File Size | |
Application Version | |
Compression | |
Review Status |
URLs
URL | |
---|---|
Name | |
URL Type | |
File Resource Format | |
Description |
URL | |
---|---|
Name | |
URL Type | |
File Resource Format | |
Description |
URL | |
---|---|
Name | |
URL Type | |
File Resource Format | |
Description |
Activity Log
Activity Time | |
---|---|
Activity Type | |
Responsible Party | |
Description |
Activity Time | |
---|---|
Activity Type | |
Responsible Party | |
Description |
Activity Time | |
---|---|
Activity Type | |
Responsible Party | |
Description |
Issues
Issue Date | |
---|---|
Author | |
Issue |
Issue Date | |
---|---|
Author | |
Issue |
Issue Date | |
---|---|
Author | |
Issue |
Data Quality
Representativeness |
|
---|---|
Accuracy |
|
Analytical Accuracy |
|
Horizontal Positional Accuracy |
|
Vertical Positional Accuracy |
|
Quantitation Limits |
|
Bias |
|
Comparability |
|
Completeness Measure |
|
Precision |
|
Analytical Precision |
|
Field Precision |
|
Sensitivity |
|
Detection Limit |
|
Completeness Report |
|
Conceptual Consistency |
|
» Quality Control Procedures Employed |
|
FAQs
Date | |
---|---|
Author | |
Question | |
Answer |
Child Items
Rubric scores updated every 15m
Score | Type | Title |
---|---|---|
Related Items
Item Type | Relationship Type | Title |
---|---|---|
Catalog Details
Catalog Item ID | 24232 |
---|---|
Metadata Record Created By | Shanae D Allen |
Metadata Record Created | 2015-03-30 14:13+0000 |
Metadata Record Last Modified By | SysAdmin InPortAdmin |
» Metadata Record Last Modified | 2022-08-09 17:11+0000 |
Metadata Record Published | 2015-12-22 |
Owner Org | SWFSC |
Metadata Publication Status | Published Externally |
Do Not Publish? | N |
Metadata Workflow State | Published / External |
Metadata Last Review Date | 2015-12-22 |
Metadata Review Frequency | 1 Year |
Metadata Next Review Date | 2016-12-22 |
Tags |
---|