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Maritza Biological Station

“Lying beneath an old-growth forest, in the shadow of an extinct volcano, with daily rainbows and spectacular sunsets over the Pacific — and at least six good streams within an easy walk in either direction — Maritza Biological Station is a stream ecologist’s dream. Now, decades after its creation as the hub of the Stroud Center’s tropical program, we still drink the water straight from the streams and still use them as the yardstick to measure the quality of fresh water throughout Central and South America.” — Bern Sweeney, Ph.D.

In 1987, Dan Janzen, the renowned evolutionary biologist, invited Stroud™ Water Research Center to establish a tropical water research laboratory in northwestern Costa Rica.

The proposed research station would complement the huge Área de Conservación Guanacaste, which he and his wife, Winnie Hallwachs, had recently proposed to the Costa Rican government. Janzen had begun assembling vulnerable parcels of land in the early 1970s, with the goal of establishing an area large enough to preserve the region’s vast biological diversity. He wanted in addition to create a replicable blueprint for conserving natural resources, protecting endangered species, and engaging local communities, particularly those who lived in areas whose critical habitats were vulnerable to powerful external forces.

Janzen’s invitation excited Stroud Center scientists and supporters. Until then, almost all research into the dynamics of freshwater ecosystems had taken place in temperate watersheds, and the proposed venture would give them a base from which to understand some of the world’s most vulnerable, varied, and unexplored sources of fresh water.

Things happened quickly after Janzen’s invitation. Within a year, the Stroud Center had raised the funds and worked closely with Janzen to convert a small farm near the base of the Orosí Volcano into a laboratory and education facility called Maritza Biological Station. In 1989, Janzen and Hallwachs’ dream of the Área de Conservación Guanacaste became a legal reality. And on March 22, 1991, Costa Rica’s President Rafael Calderon dedicated Maritza Station as a permanent freshwater research facility.

Maritza Biological Station, with Orosí volcano in the distance

In time, the streams flowing through the station would, like White Clay Creek, become a Long-Term Research in Environmental Biology site, funded by the National Science Foundation. To date, those streams have generated more than 30 peer-reviewed scientific papers. Área de Conservación Guanacaste is now a UNESCO World Heritage Site, protecting an estimated 375,000 species, and Maritza Station has become the headquarters for the Stroud Center’s tropical ecosystem studies. From there, its research projects and education programs have spread to other parts of Central and South America, while the station itself has become a resource for scientists, teachers, and land managers throughout the region.

Since the early 2000s a Costa Rican nonprofit lead by Steve Stroud, Asociación Centro de Investigación Stroud (ACIS), has overseen legal and administrative matters at Maritza for the Stroud Center. Maritza is staffed by two long-term employees, Rafael Morales Cueto, field station manager and lead technician, and Cristian Collado Lopez, field assistant and technician. Since 1989, Maritza and ACIS have been the headquarters and foundation for the Stroud Center’s tropical research programs throughout Central and South America.

Maritza News

Stroud Center to Be Featured in PBS Series
Stroud Center to Be Featured in PBS Series
Visionaries, Inc., a non-profit documentary film production company, will feature Stroud Water Research Center in its 24th season on PBS ... Read More
An Introduction to Tropical Stream Research
An Introduction to Tropical Stream Research
Stroud Center scientists introduced six board members to Maritza Biological Station and the importance of our water research in the tropics ... Read More
Photo of a rainbow near Maritza Biological Station, Costa Rica
Field Notes From Our Work in Costa Rica
A team of five Stroud Center scientists worked under the rainbows of the Orosí Volcano in Costa Rica to survey a dozen streams ... Read More
Video still of a tapir enjoying the rain
“Caught” at Maritza: Tapir Enjoying the Rain
Rafa Morales Cueto, field station manager at Maritza Biological Station, filmed this tapir enjoying the rain while swimming in Río Tempisquito ... Read More
Scott Ensign in the lowland dry forest near Maritza
Meet Scott Ensign, New Assistant Director
Ensign comes to the Stroud Center at a unique point in its history. “Many of the legendary scientists who made the Stroud Center famous are retired, and the next generation of scientists is leading us forward." ... Read More
Global Impact: Preserving and Conserving Fresh Water Around the World
Global Impact: Preserving and Conserving Fresh Water Around the World
Our scientists are advancing knowledge of freshwater systems on five continents and our educators are using the Leaf Pack Network® materials to teach freshwater stewardship throughout North, Central and South America, with plans to expand to Africa and China ... Read More
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Join the Clean Water Paddle Push!

When: August 1–16
Where: A body of water near you!

Grab your paddleboard, canoe, kayak, or inner tube and hit a body of water near you during our two-week celebration of water, the earth’s most vital natural resource.

Get all the details