Monk Seal Ecosystem Model: observation data and output data hindcast

Pacific Islands Fisheries Science Center
Entity (ENT) | ID: 36658 | Published / External
Created: 2017-02-06   |   Last Modified: 2022-08-09

Parent: Monk Seal Ecosystem Model Data: A Comparison of Ecosystem Structure and Energy Flows of Monk Seal Populations from Laysan Island and French Frigate Shoals in the Northwestern Ha...
Data Set (DS) | ID: 35796

ID: 36658
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* » Title Monk Seal Ecosystem Model: observation data and output data hindcast
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* » 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).
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» 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
Change Summary

Data Attributes

Attribute Summary

Score Req'd? PKey? » Name Data Storage Type Description
100 No No 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 No No Year NUMBER Year of the observation data, 1998 through 2015.
100 No No 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 No No 3: Monk Seals NUMBER The biomass from the simulation runs for monk seals measured in tons/square kilometer.
100 No No 9: Benthic bottomfish NUMBER The biomass from the simulation runs for benthic bottomfish measured in tons/square kilometer.
100 No No 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

Attribute Name ISLANDCODE
Seq. Order 1
Data Storage Type TEXT
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Required No
Primary Key No
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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
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Attribute Name Year
Seq. Order 2
Data Storage Type NUMBER
Max Length 11
Min Length 4
Required No
Primary Key No
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Description

Year of the observation data, 1998 through 2015.
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Unit of Measure month
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Attribute Name YEAR_MONTH
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Data Storage Type NUMBER
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Required No
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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.).
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Attribute Name 3: Monk Seals
Seq. Order 3
Data Storage Type NUMBER
Max Length 19
Min Length 16
Required No
Primary Key No
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Scale  
Status Active
Description

The biomass from the simulation runs for monk seals measured in tons/square kilometer.
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Unit of Measure t/km2
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Attribute Name 9: Benthic bottomfish
Seq. Order 4
Data Storage Type NUMBER
Max Length 18
Min Length 16
Required No
Primary Key No
Precision  
Scale  
Status Active
Description

The biomass from the simulation runs for benthic bottomfish measured in tons/square kilometer.
General Data Type  
Unit of Measure t/km2
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Attribute Name REMOVAL
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Data Storage Type TEXT
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Required No
Primary Key No
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Status Active
Description

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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Catalog Details

Catalog Item ID 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 Workflow State Published / External
Metadata Last Review Date 2019-05-08
Metadata Review Frequency 1 Year
Metadata Next Review Date 2020-05-08
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