2004 UC Proceedings Abstract
Using the ArcInfo Network Module to Determine Fish Population Structure Track: Forestry, Wildlife, and Fisheries Management Author(s): Robert Schick As part of federally mandated salmonid recovery efforts under the Endangered Species Act, NOAA Fisheries is tasked with documenting the historical population structure of endangered salmonids. To reconstruct potential historical population structure for steelhead (Oncorhynchus mykiss) in California, the network module of ArcInfo Workstation was used to determine the "within" and "among" basin levels of connectivity. Specifically, TRACE, NODEDISTANCE, and ALLOCATE were used to calculate distance upstream, node-to-node network distance, and allocated route system. Width functions were employed to determine the distance to a watershed, which was needed to locate the midpoint of a habitat. This distance matrix was used to look at watershed level connectivity across the Central Valley, California. As part of the salmonid recovery efforts, these products are then used to predict population connectivity at multiple scales. Robert Schick NOAA Fisheries Salmon Population Analysis Team 110 Shaffer Rd Santa Cruz , CA 95060 US Phone: 831-420-3960 E-mail: robert.schick@noaa.gov |
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