Name: AQUATIC_DRAIN_UNITS

Display Field: EDU

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: This data was created as part of the Missouri Aquatic Gap Project. Ecological Drainage Units (EDUs) are largely zoogeographic substrata of Subregions. EDUs were empirically derived and represent fairly large watersheds or subdrainages (approx 2,500-10,000 mi²) containing aquatic assemblages that are relatively distinct within the context of the surrounding Subregion. Our EDUs are quite similar to the faunal divisions of Pflieger's Aquatic Community Classification for Missouri (Pflieger 1989). We decided not to simply adopt these faunal divisions for two important reasons. First, Pflieger utilized 1,608 community fish samples to generate the constancy/fidelity indices he used to delineate his faunal divisions. We had at our disposal those same 1,608 samples plus nearly 1,000 additional samples. Second, we had assembled 1,000's of collection records for 3 other taxa (crayfish, mussels, and snails) that we believed should be included in any effort to delineate zoogeographic subunits of our three Aquatic Subregions.

Service Item Id: f8a60e82ea6a4f878e5457994b91e387

Copyright Text:

Default Visibility: false

MaxRecordCount: 2000

Supported Query Formats: JSON, geoJSON, PBF

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Spatial Reference: 26915  (26915)  LatestVCSWkid(0)

Drawing Info:

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Simple Renderer:
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Advanced Query Capabilities:

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Supports Sql Expression: true
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HasZ: false

HasM: false

Has Attachments: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Type ID Field: null

Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• EDU_ID ( type: esriFieldTypeSmallInteger, alias: EDUCODE )
• EDU ( type: esriFieldTypeString, alias: EDUNAME, length: 70 )
• SHAPE ( type: esriFieldTypeGeometry, alias: SHAPE )
• SHAPE.STArea() ( type: esriFieldTypeDouble, alias: SHAPE.STArea() )
• SHAPE.STLength() ( type: esriFieldTypeDouble, alias: SHAPE.STLength() )

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

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