Monk Seal Ecosystem Model: observation data and output data hindcast
Entity (ENT) | Pacific Islands Fisheries Science Center (PIFSC)GUID: gov.noaa.nmfs.inport:36658 | Updated: August 9, 2022 | Published / External
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Summary
Through hindcast (1998-2015) simulations we evaluated the importance of different drivers on the Laysan and French Frigate Shoals monk seal nesting populations. External drivers assessed were the Pacific Decadal Oscillation (PDO), the (cessation of) bottomfish fishery, and an additional external mortality factor to monk seals. We also evaluated combinations of these drivers. Importance of drivers was determined by the 'best-fit' model , i..e. the model where the simulated data best matched the observed data on monk seal and bottomfish biomass.
DescriptionData used to create the figures in the Weijerman et al 2017 EwE monk seal manuscript: A comparative application of trophic ecosystem models to evaluate drivers of endangered Hawaiian monk seal populations
Entity Information
Entity Type
Spreadsheet
Data Attribute / Type | Description |
---|---|
ISLANDCODE
TEXT |
The 3-letter code for the island/atoll in the Northwestern Hawaiian Islands for which the model was run. FFS = French Frigate Shoals LAY = Laysan |
Year
NUMBER |
Year of the observation data, 1998 through 2015. |
YEAR_MONTH
NUMBER |
Monthly output of simulation run from 1998 through 2015, formatted as 4-digit Year + decimal month (3 months = 0.25, 6 months = 0.5, etc.). |
3: Monk Seals
NUMBER |
The biomass from the simulation runs for monk seals measured in tons/square kilometer. |
9: Benthic bottomfish
NUMBER |
The biomass from the simulation runs for benthic bottomfish measured in tons/square kilometer. |
REMOVAL
TEXT |
The percent of monk seal biomass removed from the area in the simulations (1% at Laysan, 7% at French Frigate Shoals). |
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No Child Items for this record.
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No contact information is available for this record.
Please contact the owner organization (PIFSC) for inquiries on this record.
Item Identification
Title: | Monk Seal Ecosystem Model: observation data and output data hindcast |
---|---|
Status: | Completed |
Abstract: |
Through hindcast (1998-2015) simulations we evaluated the importance of different drivers on the Laysan and French Frigate Shoals monk seal nesting populations. External drivers assessed were the Pacific Decadal Oscillation (PDO), the (cessation of) bottomfish fishery, and an additional external mortality factor to monk seals. We also evaluated combinations of these drivers. Importance of drivers was determined by the 'best-fit' model , i..e. the model where the simulated data best matched the observed data on monk seal and bottomfish biomass. |
Purpose: |
To understand what drivers were most important for the observed trend of monk seal nesting populations we simulated different drivers and compared model output data with observational data of bottomfish and monk seal biomass. The simulation that resulted in the best fit between these two time series was deemed to represent the actual driver in the decline of the monk seal best. In both the Laysan as well as the French Frigate Shoal nesting monk seal population, historical fishing for bottomfish with an additional unexplained mortality on monk seals best described the trend in monk seal and bottomfish biomass. The model output data shows the fishery only data (Fishery_only.csv) and the fishery plus an additional percentage of mortality on monk seals data (Fishery_plus_percent_removal.csv) which we compared withe the observational data (Observation_data.csv). |
Entity Information
Entity Type: | Spreadsheet |
---|---|
Active Version?: | Yes |
Description: |
Data used to create the figures in the Weijerman et al 2017 EwE monk seal manuscript: A comparative application of trophic ecosystem models to evaluate drivers of endangered Hawaiian monk seal populations |
Data Attributes
Attribute Summary
Name | Type | Description | ||
---|---|---|---|---|
100
|
ISLANDCODE | TEXT | The 3-letter code for the island/atoll in the Northwestern Hawaiian Islands for which the model was run. FFS = French Frigate Shoals LAY = Laysan | |
100
|
Year | NUMBER | Year of the observation data, 1998 through 2015. | |
100
|
YEAR_MONTH | NUMBER | Monthly output of simulation run from 1998 through 2015, formatted as 4-digit Year + decimal month (3 months = 0.25, 6 months = 0.5, etc.). | |
100
|
3: Monk Seals | NUMBER | The biomass from the simulation runs for monk seals measured in tons/square kilometer. | |
100
|
9: Benthic bottomfish | NUMBER | The biomass from the simulation runs for benthic bottomfish measured in tons/square kilometer. | |
100
|
REMOVAL | TEXT | The percent of monk seal biomass removed from the area in the simulations (1% at Laysan, 7% at French Frigate Shoals). |
Attribute Details
ISLANDCODE
Seq. Order: | 1 |
---|---|
Data Storage Type: | TEXT |
Required: | No |
Primary Key: | No |
Status: | Active |
Description: |
The 3-letter code for the island/atoll in the Northwestern Hawaiian Islands for which the model was run. FFS = French Frigate Shoals LAY = Laysan |
Year
Seq. Order: | 2 |
---|---|
Data Storage Type: | NUMBER |
Max Length: | 11 |
Min Length: | 4 |
Required: | No |
Primary Key: | No |
Status: | Active |
Description: |
Year of the observation data, 1998 through 2015. |
Unit of Measure: | month |
YEAR_MONTH
Seq. Order: | 2 |
---|---|
Data Storage Type: | NUMBER |
Required: | No |
Primary Key: | No |
Status: | Active |
Description: |
Monthly output of simulation run from 1998 through 2015, formatted as 4-digit Year + decimal month (3 months = 0.25, 6 months = 0.5, etc.). |
3: Monk Seals
Seq. Order: | 3 |
---|---|
Data Storage Type: | NUMBER |
Max Length: | 19 |
Min Length: | 16 |
Required: | No |
Primary Key: | No |
Status: | Active |
Description: |
The biomass from the simulation runs for monk seals measured in tons/square kilometer. |
Unit of Measure: | t/km2 |
9: Benthic bottomfish
Seq. Order: | 4 |
---|---|
Data Storage Type: | NUMBER |
Max Length: | 18 |
Min Length: | 16 |
Required: | No |
Primary Key: | No |
Status: | Active |
Description: |
The biomass from the simulation runs for benthic bottomfish measured in tons/square kilometer. |
Unit of Measure: | t/km2 |
REMOVAL
Data Storage Type: | TEXT |
---|---|
Required: | No |
Primary Key: | No |
Status: | Active |
Description: |
The percent of monk seal biomass removed from the area in the simulations (1% at Laysan, 7% at French Frigate Shoals). |
Catalog Details
Catalog Item ID: | 36658 |
---|---|
GUID: | gov.noaa.nmfs.inport:36658 |
Metadata Record Created By: | Nicole P Kamalu |
Metadata Record Created: | 2017-02-06 15:34+0000 |
Metadata Record Last Modified By: | SysAdmin InPortAdmin |
Metadata Record Last Modified: | 2022-08-09 17:11+0000 |
Metadata Record Published: | 2019-05-08 |
Owner Org: | PIFSC |
Metadata Publication Status: | Published Externally |
Do Not Publish?: | N |
Metadata Last Review Date: | 2019-05-08 |
Metadata Review Frequency: | 1 Year |
Metadata Next Review Date: | 2020-05-08 |