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Showing 502 results for SFAN ...
- Type: Article
As the San Francisco Bay Area Network coho and steelhead monitoring crew wraps up the 2024-2025 spawner season, we are looking back at one of the busiest winters since the beginning of this monitoring program! We observed increased coho spawning in all three creeks we monitor—Olema, Pine Gulch, and Redwood Creeks. Olema took the cake with the strongest cohort of all.
- Type: Article
This elephant seal breeding season, the single-day cow count peaked at 1,159 on 1/27, which is similar to last year’s peak count of 1,165. Pup counts were higher than the five-year average this season. This is likely due to the lack of strong storms this winter and thus high pup survival.
- Type: Article
Working within the structure of the One Tamalpais Collaborative, the Golden Gate National Parks Conservancy received $400,000 in funding through the California Wildlife Conservation Board’s pollinator rescue program to invest in protection of monarch butterflies in Marin County.
- Type: Article
In early October, biologists with the San Francisco Bay Area Network Coho & Steelhead Monitoring Program assisted the California Department of Fish & Wildlife in collecting 40 juvenile coho salmon from Olema Creek. Now, these fish are living in the Don Clausen Fish Hatchery located at Lake Sonoma in Sonoma County.
Point Reyes National Seashore
Researchers Complete First Season of Point Reyes Mountain Beaver Habitat Surveys
- Type: Article
The Point Reyes mountain beaver—a primitive rodent that isn’t a beaver—is a sort of mythical creature at Point Reyes National Seashore. Almost no one has seen one in-person with their own eyes. Not even National Park Service Wildlife Biologists Taylor Ellis and Matt Lau, who just completed their first season of surveys as a part of a 2-year mountain beaver habitat modeling project in collaboration with UC Berkeley. Still, the survey season was a great success.
- Type: Article
Only 16 cows and 14 nursing pups remain at the Seashore! There are still 112 males scattered around, looking for their last chance to mate. This year’s weaned pup counts are higher than average. A total of 1063 weanlings were counted on 3/6.
Golden Gate National Recreation Area
Cold War, Lavender Scare, and LGB Activism
- Type: Article
The Nike Missile Site SF-88, is a Cold War era military site In the Marin Headlands. During the Cold War, there were close to 300 of these sites around the U.S. armed with powerful missiles. The fear of the enemy, the fear of the ‘other’ that powered this missile defense system, is the same sentiment that fueled the military ban on LGB people.
- Type: Article
Federally endangered coho salmon and threatened steelhead trout are large, charismatic fish that play crucial roles in both stream and ocean ecosystems. The National Park Service Inventory and Monitoring Program and its partners began monitoring coho and steelhead in Golden Gate National Recreation Area and Point Reyes National Seashore in 1998.
- Type: Article
Limantour Beach is wide. Bookended by ocean on one side and grassy dunes on the other, its sandy expanse provides a habitat for many organisms that rely on the rich ecosystem between land and sea. The western snowy plover, a small brown and white shorebird, is one species that finds refuge in the sand. Over time, human activity and development have degraded many beaches like Limantour, and biologists have seen those impacts through the eyes of the snowy plovers.
Golden Gate National Recreation Area
Scientists Use Sediment Cores to Look Into the Past at Rodeo Lagoon
- Type: Article
Have you ever wondered what an environment looked like in the past? Or how much human-caused change has altered an area? So have scientists at Golden Gate National Recreation Area and the US Geological Survey! Sediment cores can act like windows into the past, containing information like what animals lived there and what their surroundings were like. In fall 2020, scientists collected about 21 four-inch sediment cores from throughout Rodeo Lagoon.
- Type: Article
For two weeks in October 2024, the San Francisco Bay Area Network fish crew travelled daily to Lake Sonoma’s Warm Springs Hatchery. There, we marked approximately 3,000 juvenile coho for release into Redwood Creek. This effort was time well spent, as these fish present unique research opportunities—as well as a chance to increase the future viability of the small wild population in Redwood Creek.
Golden Gate National Recreation Area
Prairie Restoration Underway at Rancho Corral de Tierra
- Type: Article
Work on the Montara Prairie Renewal Project began in Fall 2024. The restoration project aims to protect and enhance coastal grasslands in the Montara Parcel of Rancho Corral de Tierra. We have already completed pre-restoration monitoring, and removal of several acres of invasive shrubs and conifers within historic grassland footprints.
- Type: Article
Meet Justin Jang and Val Kostelnik, Watershed Stewards Program corpsmembers who recently began 10.5-month terms with the salmonids monitoring team based at Point Reyes National Seashore.
- Type: Article
Each summer, the San Francisco Bay Area Network fisheries crew spends a majority of its time in three Marin County, CA streams, Olema Creek, Pine Gulch Creek, and Redwood Creek, monitoring juvenile coho and steelhead populations. After completing this season's surveys, we found that 2024 was a decent year for juvenile coho!
Golden Gate National Recreation Area
Un-bee-lievable Find on Mt. Tamalpais: A Rare Bee Lost For Decades
- Type: Article
Leaf-cutter ants may get all the nature documentary attention, but have you ever seen a leaf-cutter bee? They are no less amazing, tidily snipping pieces of leaves or petals and using them, sometimes along with tree resin, to build their uniquely shaped burrows. The Bay Area is home to an endemic leaf-cutter bee species—the San Francisco leaf-cutter bee. But no one had recorded this special status species since 1980—until now!
Golden Gate National Recreation Area
Translocation Project Brings Mission Blue Butterflies Back to Sweeney Ridge
- Type: Article
Sweeney Ridge was once one of the few remaining places to support endangered Mission blue butterflies on the San Francisco Peninsula. But the quarter-sized, iridescent insects disappeared from the site after a fungal outbreak decimated their host plants in the late 1980’s. Recently, a multi-agency collaborative formed to bring mission blues back to Sweeney Ridge. Thanks to its efforts, Mission blue butterflies are now flying there again for the first time in 35 years!
- Type: Article
Should a reintroduced wildlife population come from one source population, or from several? This question is actively debated among conservation biologists. Presidio Trust biologists tried the former approach in 2015 when they first reintroduced threespine stickleback into Mountain Lake from a population in nearby Lobos Creek. Now, after what may have been a disease-related die-off in 2020, they will draw on three local stickleback populations for a second reintroduction.
- Type: Article
With the coho spawner season over, our San Francisco Bay Area Network fisheries crew shifted focus to a different generation of salmonids in Redwood Creek. Deep pools and sheltered banks below the creek’s surface are home to juvenile coho salmon and steelhead trout. Crew members braved the cold and plunged into the 47°F water to conduct snorkel surveys and assess winter habitat use by these populations.
- Type: Article
This year Redwood Creek, Olema Creek, and Pine Gulch are all playing host to adult Chinook salmon, also known as king salmon due to their impressive size, for the first time in monitoring history. To date, our San Francisco Bay Area Network fisheries crew has recorded over 80 Chinook across the creeks we monitor! For comparison, the highest historic number of adult Chinook for Lagunitas Creek, the nearest creek with a frequent spawning run, was 65 in winter 2018-2019.
- Type: Article
When they come ashore to breed each winter, male northern elephant seals usually show off a predictable, mating-focused behavioral repertoire. Heroic or even helpful acts are basically not in there. It's not just them; helping others is quite rare among male marine mammals in general. So Marine Ecologist Dr. Sarah Allen and Wildlife Biologist Matt Lau could hardly believe their eyes as they watched a bull rescue a pup on January 27, 2022, at Point Reyes National Seashore.