Parent Layer: Tidal BIBI

Name: Versar BIBI Random Stations Condition

Display Field: STRATUM

Type: Feature Layer

Geometry Type: esriGeometryPoint

Description: This layer includes tidal Benthic Index of Biotic Integrity (BIBI) data for randomly selected stations in the Choptank River (1995-2014). Data were collected by the Chesapeake Bay Program/Versar (http://www.versar.com/, http://www.chesapeakebay.net/data/downloads/baywide_benthic_database). A probability based sampling component was added in 1994 to assess benthic community condition at randomly selected sites throughout the Chesapeake Bay mainstem and tributaries to assess bay-wide patterns and spatial variability. In each of ten strata, 25 randomly selected sites are allocated each year, with one sample collected at each site. Probability based samples of benthic organisms are collected with a 0.044 m2 surface area Young grab. Multiple metrics are used in the calculation of the overall B-IBI, including Shannon-Weiner species diversity index, total species abundance, total species biomass, and others (Llansó, 2002). Summary statistics for each metric are scored on a ranking of 1, 3, or 5, with least disturbed sites receiving a 5 and severely degraded sites receiving a 1. The scoring is done by comparing observed metrics with established thresholds derived from reference data (Llansó, 2002). The overall B-IBI score is then calculated by averaging the scores for all individual 1-5 metrics. The Chesapeake Bay Benthic Monitoring Program classifies benthic community condition into four levels according to the following breakpoints: “meets restoration goals” (≥3.0), “marginally degraded” (2.7-2.9), “degraded” (2.1-2.6), and “severely degraded” (≤2.0) (CBP, 2012; Llansó, 2002). The mean ± standard error (SE) B-IBI was calculated for each station and sampling date and values were coded for condition based on these criteria.

Copyright Text: Versar Inc.

Default Visibility: false

MaxRecordCount: 1000

Supported Query Formats: JSON, geoJSON, PBF

Min Scale: 0

Max Scale: 0

Supports Advanced Queries: true

Supports Statistics: true

Has Labels: false

Can Modify Layer: true

Can Scale Symbols: false

Use Standardized Queries: true

Supports Datum Transformation: true

Extent:

XMin: 453364.30867157306
YMin: 89987.52347220667
XMax: 501078.86605039367
YMax: 133669.846566163
Spatial Reference: 26985  (26985)

Drawing Info:

Renderer:
Unique Value Renderer:
Field 1: CONDITION
Field 2: N/A
Field 3: N/A
Field Delimiter: ,
Default Symbol:
N/A
Default Label: N/A
UniqueValueInfos:
• Value: Meets restoration goals
  Label: Meets restoration goals
  Description: N/A
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• Value: Degraded
  Label: Degraded
  Description: N/A
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• Value: Severely degraded
  Label: Severely degraded
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Transparency: 0
Labeling Info:

Advanced Query Capabilities:

Supports Statistics: true
Supports OrderBy: true
Supports Distinct: true
Supports Pagination: true
Supports TrueCurve: true
Supports Returning Query Extent: true
Supports Query With Distance: true
Supports Sql Expression: true
Supports Query With ResultType: false
Supports Returning Geometry Centroid: false
Supports Binning LOD: false
Supports Query With LOD Spatial Reference: false

HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: Object ID )
• STATION ( type: esriFieldTypeDouble, alias: Station )
• TOTAL_DEPTH ( type: esriFieldTypeDouble, alias: Total Depth )
• SOURCE ( type: esriFieldTypeString, alias: Source, length: 255 )
• SAMPLE_DATE ( type: esriFieldTypeDate, alias: Sample Date, length: 8 )
• SITE_TYPE ( type: esriFieldTypeString, alias: Site Type, length: 255 )
• IBI_SALZONE ( type: esriFieldTypeString, alias: IBI Salinity Zone, length: 255 )
• IBI_BOTTOM_TYPE ( type: esriFieldTypeString, alias: IBI Bottom Type, length: 255 )
• MEAN_IBI_SCORE ( type: esriFieldTypeDouble, alias: Mean IBI Score )
• MEAN_TOT_ABUND ( type: esriFieldTypeDouble, alias: Mean Total Abundance )
• MEAN_TOT_BIOMASS ( type: esriFieldTypeDouble, alias: Mean Total Biomass )
• CONDITION ( type: esriFieldTypeString, alias: Condition , length: 255 )
• YEAR_ ( type: esriFieldTypeDouble, alias: Year )
• Shape ( type: esriFieldTypeGeometry, alias: Shape )

Supported Operations:   Query   Query Attachments   Query Analytic   Generate Renderer   Return Updates

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