Parent Layer: Non-Tidal

Name: MBSS BIBI Random Stations Condition

Display Field: StreamName

Type: Feature Layer

Geometry Type: esriGeometryPoint

Description: This layer includes non-tidal Benthic Index of Biotic Integrity (B-IBI) data (1996-2014) for randomly selected stations surveyed by the Maryland Biological Stream Survey (MBSS, http://dnr.maryland.gov/streams/Pages/mbss.aspx). The goals of the MBSS, which began in 1995, are to assess current condition and changes in ecological resources of Maryland’s 1st through 4th order non-tidal streams, as well as provide an inventory of biodiversity and identify effects of stressors on the natural resources (Stranko et al., 2014). The MBSS is a stratified random survey with a lattice design. Year and basin are included as strata and sampling is restricted each year to approximately one-third of the major drainage basins (Mercurio et al., 1999). At each MBSS sampling location, benthic macroinvertebrates are sampled from a 20 ft2 area with a standard D-net (Stranko et al., 2014). Community composition data is used to calculate a suite of summary metrics that are included in the calculation of a B-IBI for the Coastal Plain region (Southerland et al., 2005). Established criteria are then used to score the metrics 1, 3, or 5, and the average of all individual metric scores represents the B-IBI (Stribling et al., 1998). The MBSS B-IBI scores can be further classified into four condition ranges: “Good “(≥4.0), “Fair” (3.0-3.9), “Poor” (2.0-2.9), and “Very Poor “(1.0-1.9). The B-IBI values for each station and sampling date were coded for condition based on these criteria.

Copyright Text: Maryland Biological Stream Survey

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Spatial Reference: 26985  (26985)

Drawing Info:

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• Value: Good
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• Value: Fair
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• Value: Poor
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• Value: Very Poor
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HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• StreamName ( type: esriFieldTypeString, alias: Stream Name, length: 30 )
• Benthic_IB ( type: esriFieldTypeDouble, alias: Benthic Index of Biological Integrity )
• CONDITION ( type: esriFieldTypeString, alias: Condition, length: 9 )
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• Year ( type: esriFieldTypeInteger, alias: Year )

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