Coho Distribution and Range
This CalFish Data Download contains two shapefiles,
Coho_Distribution.shp and Coho_Range.shp.
Below are the descriptive abstracts for each shapefile
followed by links to their complete metadata. Please read the complete metadata before using these
datasets.
Coho Distribution Abstract
April 2009 Version
Data Content:
This data set contains all CalWater 2.2.1 Planning Watersheds
(PWS) where DFG has documented coho salmon to be present during or after 1990.
It was developed for the express purpose of assisting with Coho salmon recovery
planning efforts. NOTE: Acreages are calculated for area inside California
only.
It is important to note that this data set does not attempt to
model the entire possible distribution of the species. Rather, it only
represents planning watersheds intersecting the known distribution, which is
based on where the species has been observed and reported. While the
distribution data may indeed represent the extent of the species, generally the
upstream extent of the distribution only represents the location of positive
sampling or other observations.. Therefore, this data set likely
represents an underestimation of the absolute geographic distribution of the
species.
Data Source:
This watershed level data set was derived by intersecting
Calwater planning watersheds with point and line features depicting Coho salmon
distribution. These features are derived from a subset of data contained in the
Aquatic Species Observation Database (ASOD), a Microsoft Access multi-species
observation data capture application. ASOD is an ongoing project developed by
the California Department of Fish and Game (CDFG), Northern Region,
Environmental Resources Information Services with assistance from CDFG Biogeographic
Data Branch and Pacific States Marine Fisheries Commission. These data are
based upon confirmed observations of Coho salmon. Effort has been made to
identify and correct watersheds that were erroneously selected due to
inaccuracies from using data of different scales. The observation data that are
the basis for the distribution were compiled from a variety of disparate
sources including but not limited to CDFG, U.S. Forest Service, National Marine
Fisheries Service, timber companies, and the public. Forms of documentation
include CDFG administrative reports, personal communications with biologists,
observation reports, and literature reviews.
This derived dataset is meant to be continually updated as
additional information is acquired. As such, any copy of this dataset is
considered to be a snapshot of the known Coho Distribution at the time of
release. It is incumbent upon the user to ensure that they have the most recent
version prior to making management or planning decisions.
Data Usage:
Examples of appropriate uses include:
Coho salmon recovery planning
Evaluation of future survey sites for Coho
Validating Coho distribution models
Examples of inappropriate uses include:
Using this data to make parcel or ground level land use
management decisions.
Using this data set to prove or support non-existence of coho at
any spatial scale.
Assuming that Coho are prevalent throughout the entire watershed.
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 Coho salmon distribution and water body location.
April 2009 Version
Data Content:
This data set contains all CalWater 2.2.1 Planning Watersheds
(PWS) where DFG has documented coho salmon to be present during or after 1990.
It was developed for the express purpose of assisting with Coho salmon recovery
planning efforts. NOTE: Acreages are calculated for area inside California
only.
It is important to note that this data set does not attempt to
model the entire possible distribution of the species. Rather, it only
represents planning watersheds intersecting the known distribution, which is
based on where the species has been observed and reported. While the
distribution data may indeed represent the extent of the species, generally the
upstream extent of the distribution only represents the location of positive
sampling or other observations.. Therefore, this data set likely
represents an underestimation of the absolute geographic distribution of the
species.
Data Source:
This watershed level data set was derived by intersecting
Calwater planning watersheds with point and line features depicting Coho salmon
distribution. These features are derived from a subset of data contained in the
Aquatic Species Observation Database (ASOD), a Microsoft Access multi-species
observation data capture application. ASOD is an ongoing project developed by
the California Department of Fish and Game (CDFG), Northern Region,
Environmental Resources Information Services with assistance from CDFG
Biogeographic Data Branch and Pacific States Marine Fisheries Commission. These
data are based upon confirmed observations of Coho salmon. Effort has been made
to identify and correct watersheds that were erroneously selected due to
inaccuracies from using data of different scales. The observation data that are
the basis for the distribution were compiled from a variety of disparate
sources including but not limited to CDFG, U.S. Forest Service, National Marine
Fisheries Service, timber companies, and the public. Forms of documentation
include CDFG administrative reports, personal communications with biologists,
observation reports, and literature reviews.
This derived dataset is meant to be continually updated as
additional information is acquired. As such, any copy of this dataset is
considered to be a snapshot of the known Coho Distribution at the time of
release. It is incumbent upon the user to ensure that they have the most recent
version prior to making management or planning decisions.
Data Usage:
Examples of appropriate uses include:
Coho salmon recovery planning
Evaluation of future survey sites for Coho
Validating Coho distribution models
Examples of inappropriate uses include:
Using this data to make parcel or ground level land use
management decisions.
Using this data set to prove or support non-existence of coho at
any spatial scale.
Assuming that Coho are prevalent throughout the entire watershed.
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 Coho salmon distribution and water body location.
June 2012
Version
This
dataset represents the "Observed Distribution" for coho salmon in California by using observations made only
between 1990 and the present. 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 by year observed 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 Environmental
Resources Information Services (ERIS).
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.
For
suggested data usage and constraints, citation/contact information and detailed
processing and attribute information, please follow this link: Complete
metadata for Coho_Distribution.shp
Coho Range Abstract
June 2012 Version
Data Content:
This data set
contains all CalWater 2.2.1 Planning Watersheds (PWS)
where DFG has documented coho salmon to be
present during or after 1990. It was developed for the express purpose of
assisting with Coho salmon recovery planning efforts. NOTE: Acreages are
calculated for area inside California only.
It is important to
note that this data set does not attempt to model the entire possible
distribution of the species. Rather, it
only represents planning watersheds intersecting the known distribution, which
is based on where the species has been observed and reported. While the distribution data may indeed
represent the extent of the species, generally the upstream extent of the
distribution only represents the location of positive sampling or other
observations..
Therefore, this data set likely represents an underestimation of the
absolute geographic distribution of the species.
Data Source:
This watershed level
data set was derived by intersecting Calwater planning
watersheds with point and line features depicting Coho salmon distribution.
These features are derived from a subset of data contained in the Aquatic
Species Observation Database (ASOD), a Microsoft Access multi-species
observation data capture application. ASOD is an ongoing project developed by
the California Department of Fish and Game (CDFG), Northern Region,
Environmental Resources Information Services with assistance from CDFG Biogeographic Data Branch and Pacific States Marine
Fisheries Commission. These data are based upon confirmed observations of Coho
salmon. Effort has been made to identify and correct watersheds that were
erroneously selected due to inaccuracies from using data of different scales.
The observation data that are the basis for the distribution were compiled from
a variety of disparate sources including but not limited to CDFG, U.S. Forest Service, National Marine Fisheries Service, timber
companies, and the public. Forms of documentation include CDFG administrative
reports, personal communications with biologists, observation reports, and
literature reviews.
This derived dataset
is meant to be continually updated as additional information is acquired. As
such, any copy of this dataset is considered to be a snapshot of the known Coho
Distribution at the time of release. It is incumbent upon the user to ensure
that they have the most recent version prior to making management or planning
decisions.
For
suggested data usage and constraints, citation/contact information and detailed
processing and attribute information, please follow this link: Complete
metadata for Coho_Range.shp