rr_coho_distribution_2007

Abstract:

"This data layer represents "Observed Distribution" for coho salmon in the Russian River watershed. Features from the original source data (see Originator information) were selected based on their spatial location within the Russian River watershed in Sonoma and Mendocino counties in California (the study area boundary of the Russian River Watershed Adaptive Management Plan project). This metadata file incorporates new information to the metadata of the original source data. This new information is indicated in quotation marks."

May 2007 Release

This dataset represents the "Observed Distribution" for coho salmon in California.  It was developed for the express purpose of assisting with species recovery planning efforts.  The process for developing this dataset was to collect as many observations of the species as possible and derive the stream-based geographic distribution for the species based solely on these positive observations.  

For the purpose of this dataset an observation is defined as a report of a sighting or other evidence of the presence of the species at a given place and time.  As such, observations are modeled as point locations in the GIS.  All such observations were collected with information regarding who reported the observation, their agency/organization/affiliation, the date that they observed the species, who compiled the information, etc.   This information is maintained in the Aquatic Species Observation Database (ASOD) hosted by DFG Northern Region's Information Services Branch (ISB).

To develop this distribution dataset, the species observations were applied to standard 1:24k hydrographic features from the National Hydrographic Dataset (NHD).  For each observation, a path was traced down the hydrography from the point of observation to the ocean, thereby deriving the shortest migration route from the point of observation to the sea.  By appending all of these migration paths together, the "Observed Distribution" for the species is developed.

It is important to note that this layer does not attempt to model the entire possible distribution of the species.  Rather, it only represents the known distribution based on where the species has been observed and reported.  While some observations indeed represent the upstream extent of the species (e.g., an observation made at a hard barrier), the majority of observations only indicate where the species was sampled for or otherwise observed.   Because of this, this dataset likely underestimates the absolute geographic distribution of the species.

It is also important to note that the species may not be found on an annual basis in all indicated reaches due to natural variations in run size, water conditions, and other environmental factors. As such, the information in this dataset should not be used to verify that the species are currently present in a given stream. Conversely, the absence of distribution linework for a given stream does not necessarily indicate that the species does not occur in that stream.  

The observation data were compiled from a variety of disparate sources including but not limited to CDFG, USFS, NMFS, timber companies, and the public. Forms of documentation include CDFG administrative reports, personal communications with biologists, observation reports, and literature reviews. The source of each feature (to the best available knowledge) is included in the data attributes for the observations in ASOD, but not for the resulting linework. The spatial data has been referenced to NHD High Resolution hydrography where available. Where NHD High Resolution is not available, data were mapped to Calhydro, a 1:100,000 scale routed hydrography developed by NCNCR-ISB from NHD Medium Resolution hydrography.

Usage of this dataset:

Examples of appropriate uses include:
- species recovery planning
- Evaluation of future survey sites for the species
- Validating species distribution models

Examples of inappropriate uses include:
- Assuming absence of a line feature means that the species are not present in that stream.
- Using this data to make parcel or ground level land use management decisions.
- Using this dataset to prove or support non-existence of the species at any spatial scale.
- Assuming that the line feature represents the maximum possible extent of species distribution.

All users of this data should seek the assistance of qualified professionals such as surveyors, hydrologists, or fishery biologists as needed to ensure that such users possess complete, precise, and up to date information on species distribution and water body location.

Any copy of this dataset is considered to be a snapshot of the species distribution at the time of release. It is impingent upon the user to ensure that they have the most recent version prior to making management or planning decisions.


Please refer to "Use Constraints" section below.

Purpose:

"This data layer was edited from its original source data set for inclusion in the Russian River Watershed Adaptive Management Plan (RRWAMP) and RRWAMP Baseline Watershed Assessment project. The intended use of this data layer in this project is to examine landscape or human factors to promote ecological health and sustainability within the Russian River watershed."

To map coho salmon observation based distribution in California to assist in Coho salmon recovery planning efforts.

Currentness_Reference:

ground condition

Attribute_Accuracy_Report:

Attributes in this dataset are designed to be objective. When appropriate, automated processes have been used to calculate attribute values. No statistical or other manipulative analysis has been performed on any fields. It is impingent upon the data compiler to most accurately represent the contributing data under the guidelines and constraints of the ASOD methodologies.