CO0052918 - Laserfiche WebLink

Home Browse Search

Soil Investigations for Data Collection in the Delta Initial Study/Proposed Mitigated Negative Declaration 75 Dunes in Contra Costa County as well as several sites along the Sacramento River in Glenn, Tehama, Shasta, and Solano counties, and one site at Nicolas on the Feather River in Sutter County. It typically occurs on interior sand dunes and sand bars (CDFW 2019c). Antioch Dunes anthicid beetles are thought to be microscavengers, feeding on dead insects and soil fungi at night and remaining inactive in burrows during the day. Adults overwinter and emerge in the spring to lay eggs. A second generation of adults emerge in early summer (CDFW 2019c). Antioch Dunes anthicid beetle has the potential to occur in the Study Area; however, this potential is low because suitable habitat is highly localized and there are few known occurrences. Implementation of Mitigation Measure MM BIO-1, which would avoid and minimize adverse impacts to suitable habitat, would reduce potential impacts to Antioch Dunes anthicid beetle and suitable habitat to: Less than Significant with Mitigation Incorporated. Sacramento anthicid beetle (Anthicus sacramento) Sacramento anthicid beetle has a NatureServe ranking of G1S1 and is included on CDFW’s Special Animals List but is not listed under FESA or CESA. This species is a 3.18-3.63 mm long terrestrial beetle that resembles an ant in appearance. It is endemic to California, and it has been detected in several locations along the Sacramento and San Joaquin Rivers from Shasta to San Joaquin counties, and one site at Nicolas on the Feather River in Sutter County. It typically occurs in interior sand dunes and sand bars, as well as in dredge spoil heaps (CDFW 2019c). Like other species in its genus, Sacramento anthicid beetles are thought to be microscavengers, feeding on dead insects and soil fungi. Adults are most commonly collected in June, July, and August, likely with two generations produced each year (CDFW 2019c). Sacramento anthicid beetle has the potential to occur in the Study Area; however, this potential is low because suitable habitat is highly localized and there are few known occurrences. Implementation of Mitigation Measure MM BIO-1, which would avoid and minimize adverse impacts to suitable habitat, would reduce potential impacts to Sacramento anthicid beetle to: Less than Significant with Mitigation Incorporated. Crotch bumble bee (Bombus crotchii) Crotch bumble bee has a NatureServe ranking of G2G3S3 and is included on CDFW’s Special Animals List but is not listed under FESA or CESA. This species is a generalist, colonial nesting bee. The current range of this species in California is from coastal California to the Sierra-Cascade Crest. Habitat for this species is not specific because the food plant genera used by obscure bumble bee (Antirrhinum, Phacelia, Clarkia, Dendromecon, Eschscholzia, and Eriogonum) are widely distributed in different habitats. Like most other species of bumble bees, Crotch bumble bees typically nest in underground cavities such as