A wetland condition assessment to consider ecological relationships of a Maya cultural keystone species within the Lake Atitlan, Guatemala littoral zone

Littoral wetland plant species such as Typha domingensis and Schoenoplectus californicus both locally called tul provide diverse ecosystem services (ES) in Lake Atitlan. These ES include removal of pollutants, oxygenation, and raw material for handicrafts. Human communities, most of whom are Indigenous Maya, actively steward littoral wetlands informed by their traditional ecological knowledge (TEK). Our goal was to assess the wetland condition in four Maya Tz'utujil communities (Santiago Atitlan, San Pedro, San Juan and San Pablo La Laguna, Guatemala), each with different management practices. We used a four-level wetland condition assessment: (1) littoral vegetation extent measured with remote Sentinel-2 and Google Earth photographs; (2) field plant surveys to measure vegetation structure and plant diversity; (3) wetland stressor assessment (stressors analyzed were land use, non-native macrophyte species [Hydrilla verticillata] and lake-level fluctuations); and (4) interviews with Maya Tz’utujil tuleros, fishers and artisans. Santiago stood out as having the highest cover and number of patches for all three species, reflecting its distinctive characteristics (e.g., lakeshore landforms and extent of wetlands) and the role of Indigenous wetland management. Of the four Maya communities, Santiago and San Juan had healthier wetlands despite being most affected by fluctuations in lake water level, reflecting the value of traditional management practices. Indigenous wetland management, informed by TEK, includes actions that sustain wetlands from stressors and global changes, including tul planting, harvesting, and extraction of non-native invasive macrophytes. Ecological value embedded in Indigenous resource management suggests the need to include these practices in governmental environmental management and policy.