Summer Steelhead Distribution and Range
This CalFish Data Download contains two shapefiles,
Summer_Steelhead_Distribution.shp and Summer_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.
Summer 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.
Summer Steelhead
Distribution October 2009 Version
This dataset depicts observation-based stream-level geographic distribution of anadromous summer-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 winter-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 Summer_Steelhead_Distribution.shp
Summer Steelhead Range Abstract
October 2009 Version
Data Content:
This data set contains all CalWater 2.2.1 Planning
Watersheds (PWS) where DFG has documented summer 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 summer 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 Summer 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 Summer_Steelhead_Range.shp