Giacomini Wetland Restoration Project: Science at the Seashore

Map showing the location of the Giacomini Wetlands relative to Tomales Bay and Point Reyes National Seashore.

Scientists, students, volunteers develop fresh insights at the Giacomini Wetlands

The Internet is not omniscient. Natural areas harbor unrecorded answers to questions yet to be asked. For instance, the Giacomini Wetlands offer fresh understandings about threatened animals and climate change. Scientists, students and volunteers converge increasingly at this new nexus for research.

The wetlands once resonated with the sound of cattle lowing. During the early 1900s levees were built to control the waters of Tomales Bay, about a one-hour drive north of San Francisco. The resulting dry land provided range for dairy cows. But drainage curtailed the natural services that wetlands had previously provided. These lost amenities included floodwater retention, water cleansing, wildlife sustenance and recreation.

In 2000, the National Park Service acquired the Waldo Giacomini Ranch in order to restore the wetlands. Alongside partners, they built new habitats and tore down a levee. With the inflow of tidal waters the wetlands' natural services resumed. Now researchers take to the wetlands for answers to new questions.


Open Transcript


[birds sing]

Title: Science at the Seashore The Giacomini Wetlands

John Dell'Osso, Interpretation Chief: Coming out to the Giacomini Wetlands within the Point Reyes National Seashore and Golden Gate National Recreation area is a treat year-round.

[birds sing and call]

There's so much wildlife teeming...[hawk cries] the headwaters of Tomales Bay.

This is an area that was originally wetlands. But in the 1940s there were some areas that were dammed up and it became a dairy ranch and stayed a dairy ranch up to about the year 2000, when the ranchers wanted to sell this land to the National Park Service--to the American people--and have it brought back to the wetlands that it once was.

The secrets and surprises of this seaside wetlands engage scientists and students.

[Birds sing and call]

Leslie Alder-Ivanbrook, Science at the Seashore: The Point Reyes National Seashore Association is a nonprofit that supports the national park. And our mission is to engage the public in the environment such as the wetlands here. Students come to experience what it's like to be out in a wetland, participating in science activities that’s very similar to what the scientists and resource managers do here at the park.

[water sloshes]

Student: It's coming through at the bottom.

Brady O'Donnell, graduate student, UC Davis: I'm studying how coastal ecosystems potentially combat climate change. Climate change is the result of carbon dioxide going into the atmosphere as a result of humans pumping it in. And when it goes into the atmosphere it can provide some negative consequences to the earth, like heating it up, because the carbon dioxide traps heat. But the ocean absorbs about one third of the carbon dioxide that we're pumping into the atmosphere. When the ocean absorbs this--kind of like a sponge-these coastal ecosystems and these common marine plants are kind of like the sponges of the oceans for the carbon dioxide. These marine plants are actually marine grasses--we call them sea grasses--that absorb carbon dioxide by converting that carbon dioxide into leaves and shoots and stems. When it dies, it lays in the mud and the sand, and new seagrasses will grow on top of it, or new mud and sand will cover the dead seagrasses. And that carbon is then trapped in the sediment, and it's buried down there.

[frog croaks]

Adler-Ivanbrook: There's a lot of organic material from the plants that decompose and become part of the soil.

[waves murmer]

Dell'Osso: When we look at another effect of climate change, sea level rise, we’re seeing these wetlands provide resilience now and into the future. This is science happening right in front of us. We have this outdoor laboratory.

Adler-Invanbrook: We have over 900 students registered to participate in Science at the Seashore programs. And over half of those will be coming to the Giacomini Wetland.

Fiona O'Kelly, educator: I want you guys to describe something about the way that I look if I was a bird you could look me up in a bird book and find me.

Boy signs, interpreted: Your eyes are greenish. Interpreter: OK, green eyes, what else? Girl signs, interpreted: Um, you have purplish lips.

Adler-Ivanbrook: Once they start looking at birds with the instruments that we provide for them they can appreciate what a bird is and the value of birds. And once they take that back to where they live...[birds chirp and call]...they start understanding the value of the birds in their own environment. In 2014 we participated in the Golden Gate National Recreation Area BioBlitz in partnership with the National Geographic Society. And we invited numerous school groups, and groups of people from the Bay Area community to visit Giacomini Wetland and discover the biodiversity that exists here.

Patrick Kleeman, Ecologist, US Geological Survey: Here at Point Reyes we've been working with California red-legged frogs for many years, trying to learn as much about their ecology as we can. Because it's a federally listed frog. It was listed as threatened back in 1996. We've been doing studies trying to figure out how they use their habitat, so that land managers can better learn how to protect them and hopefully bring them back from being threatened. I told everybody up front that we''re probably unlikely to see California red-legged frogs because they were in a deeper pond than we were going to be able to go near. And it was a bit of misty evening, so it was a good evening for amphibians to be out and about. As we started our walk there was a little boy who was walking down the path in front of me, and shortly after we started, he said, "What's this frog down here?" And turned out it was an adult California red-legged frog. I was able to catch it, and show it to everybody, and release it and let it go on its own way to carry out its little happy life.

[frog croaks] [frog keeps croaking]

Dell'Osso: From this sometimes soggy soil, to tadpoles wriggling through the water, to birds that sweep across the sky, the Giacomini Wetlands harbor science lessons we have yet to learn. The National Park Service invites you to come here and learn about the relevance of the Giacomini Wetlands.

[geese call. birds chatter]

Visit our keyboard shortcuts docs for details
5 minutes, 24 seconds

Scientists, students, and volunteers develop fresh insights at the restored Giacomini Wetlands of Point Reyes National Seashore.


"The work needs many hands," said Laurie Hall, an environmental scientist at Humboldt State University in Arcata, California. She enlisted undergrads and interns to help canvas the wetlands of the Bay Area at night in search of secretive marsh birds.

To participate in activities similar to those of researchers, youth come from around the San Francisco Bay area. Five hundred students registered to visit the Giacomini Wetlands in 2016. They follow scientific procedures using microscopes, binoculars and spotting scopes to observe sediment, plants, invertebrates and birds.

"Once they start looking at birds with the instruments that we provide for them, they can appreciate what a bird is and the value of birds," said Leslie Adler-Ivanbrook, manager of the Science at the Seashore program with the Point Reyes National Seashore Association. "They start understanding the value of the birds in their own environment."

The wetlands and Tomales Bay hold answers to questions about how a mouse-sized bird takes up residence in a new place, how aquatic plants sequester carbon, and how a state amphibian uses its habitat.

Illustration of a black rail.

How do California black rails disperse among isolated wetlands in the Bay Area?
"Rails are some of the most elusive and poorly understood birds. Few studies have directly quantified their dispersal distances," Hall said.

The California black rail, a rare wetland bird, is state-listed as threatened. Historically, black rails were quite abundant around Tomales Bay. But loss of their wetland habitat decreased the number of rails. And loss of nearby wetlands isolated the Giacomini Wetlands, Hall said. She wanted to discover how far rails disperse throughout the larger San Francisco Bay Area.

Volunteers pitched in to help from Point Blue Conservation Science, U.S. Fish and Wildlife Service, the National Park Service and the public. Many citizen scientists had never been involved in research or had even seen a black rail, Hall said.

Hall found that the birds' dispersal, which is important for sustaining the population, did not seem hampered by the relatively isolated, wetland habitat at Giacomini. "But future changes in Bay Area wetlands caused by development will be exacerbated by sea level rise," she said.

The Giacomini Wetlands have been protected from development, but not from sea level rise. Would the rail's ability to disperse under isolated conditions help it to survive sea level rise? Future tromping through the wetlands may yield the answer to this question.

Illustration of eel grass.

Would "blue carbon" combat climate change in California?
Brady O'Donnell, a graduate student at the University of California, Davis, studies how coastal ecosystems combat climate change. He monitors research plots in Tomales Bay, including one close to the wetlands.

Earth's climate is changing due to mounting carbon dioxide and other greenhouse gases in the air. Humans spew these gasses into the atmosphere when they burn coal, oil, and other fossil fuels. These gasses act like a blanket around our planet. They hold in the Sun's heat and do not let much escape.

The oceans, like a giant sponge, absorb about one third of this carbon dioxide, O'Donnell said. Mangroves, seagrasses, and other ocean plants—called "blue carbon"—use carbon dioxide to grow leaves, roots and stems, he said. Sand and clay may cover the plants when they die.

In this process sediments may bury more than 1,000 pounds of plant-based carbon per acre each year, according to the Verified Carbon Standard. The VCS aims to work with leaders worldwide to reduce greenhouse gases.

Scientists have studied blue carbon around the world, said O'Donnell. However, he is carrying out the first study in California that looks at seagrasses. He wants to determine how the density of the plants affects their rate of carbon burial here. He also wants to find out whether the carbon stays buried, he said.

If O'Donnell finds that seagrass beds bury significant amounts of carbon in California, then policies to protect seagrass habitat may ameliorate the effects of climate change in Tomales Bay, he said.

"Creative opportunities to address climate change may provide part of the solution in the present time," O'Donnell said.

At the Giacomini Wetlands, fourth-graders use the same kind of sieves that O'Donnell uses when he separates plant material from shells at Bodega Marine Lab. The students also roll sediment between their hands and sniff decomposing plants. Such activities may someday help them comprehend the concept of blue carbon.

Illustration of a red-legged frog.

How do threatened California red-legged frogs use their habitat?
The California red-legged frog--the state amphibian--abounds in the Giacomini Wetlands and surrounding area, said Patrick Kleeman, an ecologist with the U.S. Geological Survey, Point Reyes. But in 1996 the frogs were federally listed as threatened under the Endangered Species Act. Their wetland habitats are in decline statewide.

"We've been trying to figure out how they use their habitat so that land managers can better learn how to protect them," Kleeman said.

Kleeman led citizen scientists through the Giacomini Wetlands during BioBlitz 2014. His group volunteered to document as many amphibians as they could during the 24-hour event sponsored by the National Geographic Society and the National Park Service.

"It was a bit of a misty evening," Kleeman said, "a good evening for amphibians to be out and about." He warned his group that they were unlikely to see California red-legged frogs, which frequented a deeper pond than they were going to go near. As they started their walk, he said, a little boy headed down the path in front of him. Kleeman said soon the boy asked, "What's this frog down here?"

It was an adult California red-legged frog.

"I caught it and showed it to everybody," Kleeman said, "and then let it go its own way to carry out its little happy life."

When land managers create the right habitat, California red-legged frogs may move in and multiply. Using radio transmitters to monitor the amphibians, Kleeman documented that some may travel more than three-fourths of a mile from their breeding ponds. Before restoration, he had found none of the frogs in a particular location. But in 2014, he counted 35 adult frogs and their eggs at the same site—improved habitat at the Giacomini Wetlands.

Adler-Ivanbrook works closely with teachers to integrate fieldwork with their classroom science curriculum. Yet when students take delight in a frog, they absorb more than scientific principles or, possibly, career inspiration. They learn to care for the wetlands, she said. "They always say they want to come back to the wetland."

Scientific processes and instruments engage the senses. For those who seek fresh understandings at the Giacomini Wetlands, physical observations may give way to a new, synthesized perception. The angle at which the morning sun softens frost that has formed on emerging grasses, the distant scent of saltwater, the clack of fennel shaken by a blast of winter wind—all comprise a figurative sense of place.

A sense of place may yield to a sense of wonder. And a sense of wonder may lead to yet another offline quest at the Giacomini Wetlands.

Carbon sequestration = 1.46 Mg C ha-1 yr-1 for marshes and mangroves
This IPCC emission factor may be used for seagrasses if relevance is justified.
VCS stands for Verified Carbon Standard, a global benchmark for carbon.

1.4 Mg ~ 3086 pounds, ~1.5 U.S. tons
1 hectare ~ 2.47 acres
1.5/2.47 ~ .6

Last updated: December 20, 2020

Park footer

Contact Info

Mailing Address:

1 Bear Valley Road
Point Reyes Station , CA 94956


This number will initially be answered by an automated attendant, from which one can opt to access a name directory, listen to recorded information about the park (i.e., directions to the park; visitor center hours of operation; fire danger information; wildlife updates; ranger-led programs; seasonal events; etc.), or speak with a ranger. Please note that if you are calling between 4:30 pm and 10 am, park staff may not be available to answer your call.

Contact Us

Stay Connected