There are many and increasing threats to biodiversity. To protect the plants and animals that share our world, we need to understand what they need to survive – and ideally, thrive – in a warming, more crowded world. And we need to better understand how meeting those needs can align with other societal values.

To do that, our scientists conduct ecological research to elucidate conservation problems, test hypotheses and solutions, and monitor results. We collaborate with the scientific community to inform and review our work, and share our findings with scientists and conservation practitioners around the world.

Science in Action

Terrestrial | Marine | Economics | Science

TNC and FEMA

How do we increase climate resilience in ways that work for people and nature?

Freshwater | Terrestrial | Science

Rewilding the San Joaquin Valley

40 years of science sets the course for the largest recovery of species in U.S. history

2023 | Marine | Science | Publications & Reports

Use of management strategy evaluation to understand the value of citizen science in managing an iconic California recreational fishery

Lyall Bellquist, William J. Harford, Frank Hurd, Alexis Jackson, Jeremy D. Prince, Jan Freiwald, Anna Neumann, Jack Likins, Jono Wilson

Conventional fisheries management relies largely on professional sources of scientific data collection, typically from academic or government institutions. Development of community-led data sources…

2023 | Marine | Science | Publications & Reports

Post-release survival and prolonged sublethal effects of capture and barotrauma on deep-dwelling rockfishes (genus Sebastes): implications for fish management and conservation

Nicholas C. Wegner, Elan J. Portner, Drew T. Nguyen, Lyall Bellquist, Andrew P. Nosal, Alena L. Pribyl, Kevin L. Stierhoff, Paul Fischer, Ken Franke, Russell D. Vetter, Philip A. Hastings, Brice X. Semmens, and John R. Hyde

Historical overfishing led to depletion of several groundfish species on the US west coast. Two of these species, Cowcod and Bocaccio, heavily influenced the expansion of groundfish regulations to…

2023 | Marine | Economics | Science | Publications & Reports

Impact of the 2014–2016 marine heatwave on US and Canada West Coast fisheries: Surprises and lessons from key case studies

Christopher M. Free, Sean C. Anderson, Elizabeth A. Hellmers, Barbara A. Muhling, Michael O. Navarro, Kate Richerson, Lauren A. Rogers, William H. Satterthwaite, Andrew R. Thompson, Jenn M. Burt, Steven D. Gaines, Kristin N. Marshall, J. Wilson White, Lyall F. Bellquist

As symptoms of climate change, extreme environmental events (e.g., marine heatwaves) now represent the greatest global threat to the oceans, causing profound ecosystem and socioeconomic impacts. The…

2023 | Marine | Planning | Science | Publications & Reports

U.S. exempted fishing permits: Role, value, and lessons learned for adaptive fisheries management

Lindsay Bonito, Lyall Bellquist, Alexis M. Jackson, Kate Kauer, Mary G. Gleason, Jono Wilson, Stuart Sandin

Experimentation supports adaptive and climate-ready fisheries management in numerous contexts. Exempted Fishing Permits (EFPs) enable fisheries participants, scientists, and managers to…

2023 | Marine | Economics | Science | Publications & Reports

Characterization of a developing recreational deep-drop fishery for swordfish off southern California

Scott A. Aalbers, Michael Wang, Lyall Bellquist, Kate Kauer, Alexis Jackson, Chugey A. Sepulveda

An emerging recreational fishery for swordfish has recently developed in California, outpacing existing fisheries monitoring programs, which prevents accurate estimation of swordfish catch and effort…

2023 | Freshwater | Terrestrial | Planning | Science | Publications & Reports

Nature-Based Solutions for Urban Stormwater Management

Kristina Kreter, Shona Ganguly, Rowan Roderick-Jones, and Kelsey Jessup

New strategies to address urban runoff management with nature-based approaches offer promising solutions to alleviating climate change impacts—like urban heat, water shortages, and…

2023 | Terrestrial | Science | Publications & Reports

Shrub density effects on the presence of an endangered lizard of the Carrizo Plain National Monument, California

Mario Zuliani, Nargol Ghazian, Malory Owen, Michael F. Westphal, H. Scott Butterfield, Christopher J. Lortie

As The Nature Conservancy embarks on restoration planning for its Strategic Restoration Strategy, it needs detailed information on the importance of shrubs to a suite of conservation targets,…

2023 | Freshwater | Terrestrial | Planning | Science | Publications & Reports

Expanding the Role of Nature-based Solutions in FEMA’s Hazard Mitigation Assistance Programs: Lessons and Recommendations

The Nature Conservancy, radbridge, Earth Economics

FEMA increasingly recognizes and emphasizes the role of nature-based solutions (NBS) for building community resilience to hazards like flood, wildfire, and drought, and the agency has made remarkable…

2023 | Terrestrial | Planning | Science | Publications & Reports

Cattle Grazing Across The Nature Conservancy in California’s Conservation Estate

Butterfield, H.S., J. Howard, Z. Principe, E. Inlander, S. Sweet, A. Craig, R. Mason, J. Knapp , M. Katkowski

For over 300 years, cattle and sheep have been grazed in California, from the Rancho era continuing to the present day. The Nature Conservancy has a long history in California and across the western…

2023 | Terrestrial | Science | Publications & Reports

Ear mite infection restructures otic microbial networks in conservation–reliant Santa Catalina Island foxes (Urocyon littoralis catalinae)

Jasmine Lu, Emily E. Hamblen, Lara J. Brenner, Julie L. King, Bridgett M. VonHoldt, Alexandra L. DeCandia

Over 50% of federally threatened Santa Catalina Island foxes (Urocyon littoralis catalinae) develop life-threatening ceruminous gland tumors in their ear canals. Previous work suggests that tumors may…

2023 | Terrestrial | Science | Publications & Reports

Oren Pollak Memorial Research Fund - 2023 RFP

Brynn Pewtherer

The Oren Pollak Memorial Research Fund was established in 2000 in memory of Dr. Oren Pollak, a leading grassland ecologist and restoration pioneer, as well as an ardent champion and mentor for…

2023 | Freshwater | Terrestrial | Marine | Science | Publications & Reports

Conservation Science Catalyst Fund - 2022 Annual Report

Scott Morrison, Brynn Pewtherer

The Nature Conservancy deploys science to help overcome major challenges facing people and nature. In today’s fast-paced world, turning threats to nature into opportunities for conservation…

2023 | Freshwater | Terrestrial | Technology | Science | Publications & Reports

Floristic patterns and conservation values of Mojave and Sonoran desert springs in California

Naomi S. Fraga, Brian S. Cohen, Andy Zdon, Maura Palacios Mejia, Sophie S. Parker

This paper presents novel botanical inventories of 48 desert springs as part of the Mojave Springs Research Project. The authors assess plant species composition and richness within and between…

2023 | Terrestrial | Marine | Technology | Science | Publications & Reports

Minimizing conservation impacts of net zero energy systems in the western United States

Grace C. Wu, Ryan A. Jones, Emily Leslie, James H. Williams, Andrew Pascale, Erica Brand, Sophie Parker, Brian Cohen, Joseph Fargione, Julia Souder, Maya Batres, Mary G. Gleason, Michael H. Schindel, Charlotte K. Stanley

This paper presents the results of the Power of Place-West project. The authors combined energy modeling with ecosystem and wildlife habitat data to determine the costs and impacts associated with…

2022 | Terrestrial | Science | Publications & Reports

Assessing the effectiveness of landscape-scale forest adaptation actions to improve resilience under projected climate change

Charles J. Maxwell, Robert M. Scheller, Kristen N. Wilson, Patricia N. Manley

The authors hypothesized that mimicking the historic fire-return interval, by matching it with the combined frequency of natural disturbances (wildfire) and management (i.e., thinning and…

2022 | Terrestrial | Science | Publications & Reports

Foundation plant species provide resilience and microclimatic heterogeneity in drylands

Chris J. Lortie, Alex Fillazola, Mike Westphal, H. Scott Butterfield

Drylands globally, and those plant and animal species in these systems, face increasing challenges from extreme drought. In California, the most recent megadrought allowed us to document for native…

2022 | Terrestrial | Planning | Science | Publications & Reports

Learning to Live with Fire in Forest Communities

The Nature Conservancy

A 2022 report, Learning to Live with Fire in Forest Communities, highlights the science and benefits of fire-resilient community design.  TNC partnered with key stakeholders in the…

2022 | Freshwater | Terrestrial | Planning | Science | Publications & Reports

Environmental & Historic Preservation Primer for Nature-Based Hazard Mitigation

The Nature Conservancy, FEMA, Nonlinear Ventures, radbridge, Earth Economics

To address the increasing risk of catastrophic flooding, wildfire and other climate-related threats, communities are pursuing nature-based solutions (NBS) and seeking FEMA hazard mitigation funds to…

2022 | Terrestrial | Science | Publications & Reports

Interspecific Asymmetries in Behavioral Plasticity Drive Seasonal Patterns of Temporal Niche Partitioning in an Island Carnivore Community

Victor Y. Zhang, Calypso N. Gagorik, Lara J. Brenner, Christina L. Boser, Tad C. Theimer, C. Loren Buck

Despite occupying similar niches in a relatively resource-poor environment, island foxes and island spotted skunks have coexisted for years through fine-scale spatial, temporal, and dietary niche…

2022 | Marine | Technology | Science | Publications & Reports

Using unoccupied aerial vehicles to map and monitor changes in emergent kelp canopy after an ecological regime shift

Vienna R. Saccomanno, Tom Bell, Camille Pawlak, Charlotte K. Stanley, Katherine C. Cavanaugh, Rietta Hohman, Kirk R. Klausmeyer, Kyle Cavanaugh, Abby Nickels, Waz Hewerdine, Corey Garza, Gary Fleener, Mary Gleason

Kelp forests are complex underwater habitats that provide valuable services for both people and nature. Despite their importance, increasingly severe stressors have resulted in declines in kelp…