Science Institute News Recent accomplishments of CDFW's scientific community Salt Marsh Harvest Mouse Survey June 23, 2017 in Wildlife Research Deep in the pickleweed in the San Francisco, San Pablo and Suisun Bays, the tiny salt marsh harvest mouse (Reithrodontomys raviventris) tries to avoid predators and compete with other species for prime habitat. Food and cover are abundant, but its overall habitat is shrinking as humans encroach upon its home range. In south San Francisco Bay alone, 95 percent of the historic salt marsh has been lost to industrial parks and subdivisions. Annual flooding in the winter can be perilous, too -- when vegetation is topped by rising tides, the mice must scramble to find taller vegetation or into upland habitat (grasses around the wetlands that don’t get flooded by the tides). As part of the effort to monitor and conserve this state- and federally-listed endangered species, biologists conduct annual surveys of the salt marsh harvest mouse. The effort involves setting up traps stuffed with cotton batting and baited with birdseed and walnuts, taking measurements and collecting other data on the subjects that are captured. In some studies, the mice are fitted with GPS collars for tracking, or ear tags to help identify them upon recapture. In other studies, the biologists simply clip away fur on the mouse’s flank or neck – another method that helps them determine whether a mouse in a trap has crossed paths with them before. Once a mouse’s measurements have been recorded, they are set loose to scamper back into the pickleweed. The data that’s been collected will later be entered into a larger database that will be accessible to researchers from multiple state agencies (CDFW, the Department of Water Resources), federal agencies (US Fish and Wildlife Service, the US Geological Survey), educational research institutions (UC Davis, CSU San Marcos, San Francisco State) and private industry. By comparing population fluctuations and other data throughout the range, scientists hope to identify threats and increase their understanding of this rare rodent’s biology and behavior – ultimately helping to better inform future decisions on habitat management, restoration and enhancement efforts. Related Posts Restoring Habitat at Southern California’s Salton Sea Stretching between Southern California’s Imperial and Coachella valleys, the Salton Sea is what one might call a landmark of untraditional beauty. At 33 miles long and 5 miles wide, it’s the state’s largest inland lake, serving a crucial role as a stopover for migratory birds using the Pacific Flyway. Survey Says: California Marine Anglers Help Scientists Collect Data If you’re an avid marine sport angler, you have most likely seen the smiling faces and brown polo shirts of California Recreational Fisheries Survey (CRFS) samplers. Since its inception in 2004, CRFS has grown into one of the state’s largest and most important survey efforts. Survey samplers are tasked with collecting data about both recreational fishing catch and effort. Suisun Marsh Study Seeks to Unlock Mysteries of Western Pond Turtles Does the Western pond turtle (Actinemys marmorata), a freshwater species native to the Pacific Coast, hold secrets to survive climate change and adapt to rising sea levels? CDFW biologists want to know and have partnered with UC Davis and the Department of Water Resources to conduct a long-term study in Solano County’s Suisun Marsh to better understand the aquatic reptiles. 2018 Waterfowl Breeding Population Survey Shows Continuing Upward Trend The California Department of Fish and Wildlife (CDFW) has completed its 2018 waterfowl breeding population survey -- and it’s good news for hunters and birdwatchers alike, as the total waterfowl population in the state now tops out at over a half million, for the first time in six years. CDFW Kelp Survey Beneath the waters off the California coast are vast forests that are home to an astounding variety of plants and animals. Their sunlit canopies can soar 150 feet from the ocean’s floor. But instead of trees, these forests are made of kelp. CDFW Completes 2017 Waterfowl Breeding Population Survey The California Department of Fish and Wildlife (CDFW) has completed its annual waterfowl breeding population survey. Tagged With: Fish and Wildlife, California, CDFW, data, endangered, GPS, mammal, pickleweed, Salt Marsh Harvest Mouse, San Francisco Bay, San Pablo Bay, SMHM, Suisun Bay, survey, video
Subscribe to receive Science Institute news by email. Email Subscribe Recent Posts Restoring Habitat at Southern California’s Salton SeaJanuary 6, 2021New Issue of CDFW Scientific Journal Focuses on WildfireJanuary 4, 2021Spotlight: Kokanee Salmon Egg Collection from Stampede ReservoirDecember 14, 2020New Issue of CDFW’s Scientific Journal Reviews Environmental Impacts of Cannabis CultivationOctober 30, 2020Endangered Fish Get a Lift to Safety After WildfiresOctober 21, 2020Read More Archives 2021January (2) 2020January (1) February (1) March (2) April (1) May (3) June (3) July (4) August (3) September (2) October (3) November (1) December (1) 2019January (2) February (3) March (4) April (4) May (2) June (2) July (2) August (1) September (1) October (1) December (1) 2018January (5) February (4) March (3) April (5) May (4) June (2) July (5) August (3) September (4) October (4) November (1) December (2) 2017February (2) March (3) April (4) May (5) June (3) July (3) August (5) September (4) October (4) November (4) December (3) Mammals Birds Reptiles and Amphibians Fish Invertebrates Plants Ecosystems Pollution and Water Quality Climate and Renewable Energy