Conservation Fisheries Human Health Human impacts Methodology Policy Sea Turtles

High-TEK Turtle Monitoring: Lessons from Traditional Ecological Knowledge

Vásquez-Carrillo, Catalina, and Manuela  Peláez-Ossa. “Insights into the ecology of sea turtles and the fisheries of eastern Guajira from the traditional knowledge of fishermen.” Fisheries Research 238 (2021): 105915. https://doi.org/10.1016/j.fishres.2021.105915

High-TEK Solutions:

In recent years, many scientists have turned toward the traditional ecological knowledge (TEK) of indigenous groups as a way to both include indigenous people in the scientific process and make informed decisions for implementing policy. For the better part of the last several centuries, indigenous people have typically been excluded from decisions on policy implementation and have been underrepresented in STEM research. However, calls from activists, policymakers and indigenous scientists have brought attention to the fact that TEK (also called socio-ecological knowledge) has a wealth of information and valuable insights to share with the scientific community. While this lack of indigenous participation has mostly been highlighted by scientists in America, Canada and Australia, scientists from other countries have also made strides to include indigenous groups in studies. This study  carried out in Colombia shows just how valuable TEK can be for monitoring sea turtles and the state of regional fisheries. 

The Study:

The researchers teamed up with several members of the Wayuu community who have been living on the Guajira peninsula for over a thousand years. The Wayuu are the largest ethnic group in the area and, due to their dependence on the ocean,  developed complex cultural practices related to sea turtles. Since sea turtles are so important to the Wayuu, they also developed TEK that allows them to actively monitor sea turtles and their regional fisheries. As climate change intensifies, they face increased risk of drought and loss of biodiversity that they have traditionally depended on for subsistence. While the researchers were primarily interested in monitoring sea turtles, they also wanted to record, contextualize and determine the accuracy of TEK from the Wayuu so that it could be integrated into both policy and fishery management across the region. 

Two Wayuu women in traditional clothing stand near a ranchería. The Guajira region is characterized by its arid climate, and has increasingly experienced droughts due to climate change. (Photo by Tanenhaus on Flickr)

The team conducted the study in the Guajira-Tairona marine ecoregion, which has a lower oceanic temperature than the surrounding area due to coastal upwelling during the first several months of the year. In order to gather TEK from the Wayuu, the researchers talked to 48  fishermen from several villages in the ecoregion. They asked questions regarding the state of the fisheries, the fishing methods used, and the types and behaviors of turtles they observed while fishing. Some of the fishermen also allowed the researchers to directly observe turtles caught during fishing activities. 

This map shows the Guajira-Tairona marine ecoregion. The researchers talked to fishermen at each of the villages listed in order to compile Wayuu TEK. From Vásquez-Carrillo and Peláez-Ossa (2021).

The results:

The fishermen reported seeing four types of sea turtles during the study period, with the green sea turtle being the most common. In addition, a few reported seeing a fifth type of turtle over the course of their lifetimes, which the researchers thought could be the Olive Ridley turtle based on the description the fishermen gave. This turtle has only been noted incidentally in other studies but the sightings could indicate a previously unknown population of these turtles in the region. The fishermen were also able to report the frequency and seasonality of the turtles, which provided valuable insights about turtle life stages in the region. The anecdotes and reports were corroborated by direct observation and several other previous studies and shows that TEK can be an accurate source of ecological data

The green sea turtle was the most frequently found turtle in the ecoregion. From Wikimedia commons.

Integrating TEK:

With the intensifying effects of climate change (such as increased sea surface temperatures and ocean acidification), the researchers are concerned about the future of the Wayuu people and the state of the ecoregion. Since the Wayuu are so dependent on the ocean for subsistence, they face an increased risk from any changes in their regional fisheries. The researchers recommend consulting with indigenous groups for policy implementation and using TEK in future studies, especially ones that require long term monitoring. They believe this will promote equitable stewardship of the marine ecoregion while supporting indigenous communities both economically and culturally. 

 

If you want to learn more about how scientists are using TEK and involving indigenous groups, check out these resources: 

SACNAS

Combining western science and TEK

Native Americans in STEM

US Fish and Wildlife

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