Biodiversity Guide - The Intertwine

egional conservation strategybiodiversity guideContentsPreface............................................................................................................................................................................................... xiChapter 1 Current Conditions...........................................................................................................................1Data Sources and Limitations........................................................................................................................1Land Cover in the Greater Portland-Vancouver Region...........................................................................4Urban and Developed Areas.......................................................................................................................4Open Water and Wetlands...........................................................................................................................5Tree Cover and Forest Patches....................................................................................................................6Agriculture.....................................................................................................................................................9Derivatives of the Land Cover......................................................................................................................10Natural Lands and Natural Patches..........................................................................................................10Interior Forest Habitat................................................................................................................................10Land Management and Public Lands..............................................................................................................10For More Information........................................................................................................................................12Chapter 2 Biogeography of the Greater Portland-Vancouver Region..............................................13Focal Area.............................................................................................................................................................15Habitat Change in the Region, 1850-2010......................................................................................................17Limitations of the Data...................................................................................................................................18Vegetation Change over the Region..............................................................................................................18Vegetation Change by Subbasin.....................................................................................................................19Data Sources and Methods.............................................................................................................................20For More information.....................................................................................................................................21How the Biodiversity Guide Relates to Other Regional Planning Efforts.................................................21The Intertwine Alliance. 2012. Biodiversity Guide for the Greater Portland-Vancouver Region.A. Sihler, editor. The Intertwine Alliance, Portland, OR. www.theintertwine.orgCopyright © 2012 The Intertwine AllianceChapter 3 Major Habitat Types of the Region..........................................................................................25Rivers, Streams, and Open Waters...................................................................................................................25Historical and Current Occurrence..............................................................................................................26River, Stream, and Open-water Species........................................................................................................27Threats Specific to Rivers, Streams, and Open Waters...............................................................................27Likely Effects of Climate Change...................................................................................................................28Conservation Strategies and Opportunities.................................................................................................28For More Information.....................................................................................................................................29i