File Geodatabase Feature Class
Tags
2011, Eel River, 2012, Foothill yellow-legged frog, South Fork Eel River, Redwood Creek, Bull Creek, biota, Rana boylii, Van Duzen River, egg mass, amphibian, Mad River, environment, Humboldt County
DFG maintains native fish, wildlife, plant species and natural communities for their intrinsic and ecological value and their benefit to the people of California. This includes habitat protection and maintenance in a sufficient amount and quality to ensure the survival of all species and natural communities. DFG is also responsible for the diversified use of fish and wildlife including recreational, commercial, scientific and educational uses. DFGs Habitat Conservation Branch, Coastal Conservation Planning (CCP) group, is responsible for many aspects of DFGs mission in Mendocino, Humboldt, Del Norte and western Trinity County. CCP reviews and comments on California Environmental Quality Act (CEQA) projects in the aforementioned counties, for the benefit of the States public trust fish and wildlife resources. Pursuant to CEQA, California State Species of Special Concern (SSC) are considered in the environmental review process and populations impacted by CEQA projects may benefit from project related mitigation designed and implemented to reduce or limit population level effects. Environmental impact assessment, or CEQA review, can include seasonally appropriate species specific surveys, but almost always includes queries of applicable databases, such as the California Natural Diversity Database (CNDDB) and the Biogeographic Information and Observation System (BIOS), maintained by the Biogeographic Data Branch of DFG. The local, regional, and global decline of amphibians is of great conservation concern and is well established in the scientific literature. Habitat loss and fragmentation, invasive species, disease, and contaminants, are among the long list of cumulative and synergistic anthropogenic effects that are attributed to species decline. Due to the need for reliable data, and inherent lack of information in many geographic locations, DFGs CCP group has developed with partners an approach to survey and document the distribution of foothill yellow-legged frog (Rana boylii), as well as more common species observed during surveys. Information from these surveys is then provided to CNNDB and BIOS for widespread use and display to better inform constituents of species presence, and ultimately inform the environmental review process and subsequent decision making.
The California Department of Fish and Game (DFG) conducts breeding season surveys to assess the presence/absence status of foothill yellow-legged frog ( Rana boylii ) in streams and rivers in Mendocino, Humboldt, Del Norte and western Trinity County. Surveys are single-pass two-person visual encounter surveys. We specifically search for egg masses in the appropriate habitat, because they are fairly conspicuous, persistent, and each egg mass equals one adult female frog. For each egg mass we collect a GPS way point, age the egg mass based on its approximate embryonic development, and inspect the egg mass for apparent signs of diseases. We also tally all adult and sub-adult frogs and other species encountered, as well as, other more common amphibians that may be breeding or present at the time of the survey.
AmeriCorps Watershed Stewards Project Volunteers; Michael van Hattem, Environmental Scientist, and Linda Miller, Research Analyst II (GIS), DFG
Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.
These data represent the reproductive output of the species on a given day during the breeding season. These data are not an estimate of population size and only represent the results of a single pass survey conducted during the appropriate breeding season. A lack of data for a given location should not be interpreted as species not present, until seasonally appropriate surveys are conducted by a qualified biologist in consultation with DFG.
Extent
| West | -124.212381 | East | -123.777164 |
| North | 41.301599 | South | 39.994884 |
| Maximum (zoomed in) | 1:5,000 |
| Minimum (zoomed out) | 1:150,000,000 |
Disclaimer: The State makes no claims, promises, or guarantees about the accuracy, completeness, reliability, or adequacy of these data and expressly disclaims liability for errors and omissions in these data. No warranty of any kind, implied, expressed, or statutory, including but not limited to the warranties of non-infringement of third party rights, title, merchantability, fitness for a particular purpose, and freedom from computer virus, is given with respect to these data.
These data represent the reproductive output of the species on a given day during the breeding season. These data are not an estimate of population size and only represent the results of a single pass survey conducted during the appropriate breeding season. A lack of data for a given location should not be interpreted as species not present, until seasonally appropriate surveys are conducted by a qualified biologist in consultation with DFG.