Winter Steelhead Distribution and Range
This CalFish Data Download contains two shapefiles,
Winter_Steelhead_Distribution.shp and Winter_Steelhead_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.
Winter Steelhead 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.
Winter
Steelhead Distribution June 2012 Version
This
dataset depicts observation-based stream-level geographic distribution of anadromous winter-run steelhead trout, Oncorhynchus
mykiss irideus (O. mykiss), in California.
It was developed for the express purpose of assisting with steelhead
recovery planning efforts. The
distributions reported in this dataset were derived from a subset of the data
contained in the Aquatic Species Observation Database (ASOD), a Microsoft
Access multi-species observation data capture application. ASOD is an ongoing project designed to
capture as complete a set of statewide inland aquatic vertebrate species
observation information as possible.
Please note: A separate
distribution is available for summer-run steelhead. Contact information is the same as for the above.
ASOD
Observation data were used to develop a network of stream segments. These lines are developed by "tracing
down" from each observation to the sea using the flow properties of USGS
National Hydrography Dataset (NHD) High Resolution hydrography. Lastly
these lines, representing stream segments, were assigned a value of either Anad Present (Anadromous
present). The end result (i.e., this
layer) consists of a set of lines representing the distribution of steelhead
based on observations in the Aquatic Species Observation Database.
This
dataset represents stream reaches that are known or believed to be used by steelhead
based on steelhead observations. Thus,
it contains only positive steelhead occurrences. The absence of distribution on a stream does
not necessarily indicate that steelhead do not utilize that stream. Additionally, steelhead may not be found in all
streams or reaches each year. This is
due to natural variations in run size, water conditions, and other
environmental factors. The information
in this data set should be used as an indicator of steelhead presence/suspected
presence at the time of the observation as indicated by the 'Late_Yr' (Latest Year) field attribute.
The line
features in the dataset may not represent the maximum extent of steelhead on a
stream; rather it is important to note that this distribution most likely
underestimates the actual distribution of steelhead. This distribution is based on observations
found in the ASOD database. The
individual observations may not have occurred at the upper extent of anadromous occupation.
In addition, no attempt was made to capture every observation of O. mykiss and so it should not be assumed that this dataset is
complete for each stream.
The
distribution dataset was built solely from the ASOD observational data. No additional data (habitat mapping, barriers
data, gradient modeling, etc.) were utilized to either add to or validate the
data. It is very possible that an anadromous observation in this dataset has been recorded
above (upstream of) a barrier as identified in the Passage Assessment Database
(PAD). In the near future, we hope to
perform a comparative analysis between this dataset and the PAD to identify and
resolve all such discrepancies. Such an
analysis will add rigor to and help validate both datasets.
For
suggested data usage and constraints, citation/contact information and detailed
processing and attribute information, please follow this link:
Complete
metadata for Winter_Steelhead_Distribution.shp
Winter Steelhead Range Abstract
June 2012 Version
Data Content:
This data set
contains all CalWater 2.2.1 Planning Watersheds (PWS)
where DFG has documented winter run steelhead to be present during or
after 1990. It was developed for the express purpose of assisting with anadromous fish 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 winter run steelhead
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 Resource 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
Winter Run Steelhead 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 Winter_Steelhead_Range.shp