Parent Layer:
Tidal BIBI
Name: Versar BIBI Fixed Stations
Display Field: STRATUM
Type: Feature Layer
Geometry Type: esriGeometryPoint
Description: Description: This layer includes tidal Benthic Index of Biotic Integrity (B-IBI) data for fixed stations in the Choptank River (1984-2014). Data were collected by the Chesapeake Bay Program/Versar (http://www.versar.com/, http://www.chesapeakebay.net/data/downloads/baywide_benthic_database). At fixed stations, a 0.025 m2 hand operated box corer is used to sample benthic organisms in the nearshore shallow habitats, while a 0.0225 m2 Wildco box corer is used in the deepwater (>4 m) habitats (see Llansó et al., 2013 for more details). 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 fixed 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: 480636.4639985026
YMin: 102850.18999206927
XMax: 494019.07597266586
YMax: 126563.06664435379
Spatial Reference: 26985
(26985)
Drawing Info:
Renderer:
Simple Renderer:
Symbol:
Label: N/A
Description: N/A
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
)
-
Shape
(
type: esriFieldTypeGeometry, alias: Shape
)
-
STATION
(
type: esriFieldTypeDouble, alias: Station
)
-
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_BIOMASS
(
type: esriFieldTypeDouble, alias: Mean Total Biomass
)
-
CONDITION
(
type: esriFieldTypeString, alias: Condition , length: 255
)
-
YEAR_
(
type: esriFieldTypeDouble, alias: Year
)
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