Standardized Field Protocols

Endemic · Endangered · A Montane Forest Specialist

Standardized field protocols ensure that biodiversity data collected across Grenada’s forests, wetlands, and coastal systems remain comparable over time, usable across projects, and consistent with regional best practices. These protocols—developed and adapted by the Gaea Conservation Network with government, academic, and community partners—are openly shared through the Open Science Framework (OSF) so that collaborators can access, review, and adopt the methods as needed.

They serve as the foundation for long-term monitoring, ensuring that field teams follow shared scientific standards, ethical guidelines, and compatible data structures that support national conservation planning.

Why Standardization Matters

Grenada’s biodiversity programme spans multiple species groups and habitats. Without shared methods, data become fragmented and difficult to compare across years or organizations.

Standard protocols allow partners to:

Collect data that are directly comparable across locations and seasons
Detect real ecological trends rather than observer differences
Integrate datasets into national and regional assessments (e.g., BirdsCaribbean, WIDECAST)
Ensure responsible handling of sensitive wildlife, particularly endangered species
Build a transparent archive of methods and metadata through OSF

By hosting these protocols on OSF, Gaea ensures open access, version control, and long-term availability for all partners participating in national monitoring efforts.

Threats

Habitat Loss and Forest Disturbance

Any reduction in canopy cover dries the forest floor, increases heat, and reduces the shaded, moisture-rich microhabitats the species depends on. Forest clearing, footpath widening, and storm-related damage all alter conditions in ways that can make upland forest unsuitable.

Climate Variability and Drying

Montane forests are experiencing shifts in rainfall and mist patterns. Because the Grenada Frog is highly moisture-dependent, even subtle changes in humidity and temperature affect its calling, movement, and reproduction.

Invasive Amphibians

The introduced Lesser Antillean Whistling Frog thrives in disturbed or open environments. While it does not appear to displace the endemic frog in intact montane forest, it outnumbers the endemic species at edges, agricultural margins, and drier forests — areas that expand when disturbance increases.

Storm Impacts and Vegetation Change

Recent hurricanes have altered upland forest structure, creating new gaps and changing leaf-litter composition. Increased light and drying reduce the cool, shaded conditions required by the endemic species.

Limited Range

The species’ extremely small distribution makes it vulnerable to any environmental change. With the entire global population restricted to Grenada’s upland forests, localized impacts have global consequences.

Research Insights and Long-Term Ecological Understanding

Modern ecological research builds on decades of earlier study. Foundational work by Henderson and colleagues established the frog’s restricted elevation range and its strong dependence on intact montane forest.

More recently, ecologist Billie Harrison has expanded this foundation through detailed field investigations. Her work focuses on:

mark–recapture studies to understand movement and site fidelity
microhabitat use, examining moisture, canopy structure, and litter conditions
calling behaviour, supporting improved detection
interactions between endemic and introduced frogs, clarifying how habitat quality shapes species overlap

Together, this growing body of research strengthens understanding of how the species uses the landscape and what conditions are essential for long-term persistence.

Across studies past and present, a consistent ecological theme emerges:
habitat quality—especially moisture, shade, and forest continuity—is the strongest predictor of where the Grenada Frog can survive.

Partners & Collaboration

The Grenada Frog conservation work brings together government agencies, academic researchers, and local conservation organisations with long-standing experience in Grenada’s upland ecosystems.

Government partners involved in this work include the Forestry and National Parks Department within the Ministry of Agriculture, Lands, Forestry, Marine Resources & Cooperatives, and the Ministry of Climate Resilience, the Environment & Renewable Energy. Forestry provides site access, ecological oversight, and continuity across protected areas where the species occurs.

Academic and research partners contribute the long-term scientific foundation for understanding the species. Earlier ecological studies by Henderson and colleagues established the frog’s range, elevations, and habitat associations. More recent work by researcher Billie Harrison has focused on fine-scale ecology—mark-recapture, movement, calling behaviour, and habitat use—helping to clarify the species’ persistence in mixed forests and areas shared with the invasive Johnstone’s Whistling Frog. St. George’s University supports this work through additional amphibian surveys, specimen documentation, and comparative ecological research.

Conservation organisations include the Gaea Conservation Network, which led the 2024–2025 surveys and is integrating amphibian monitoring into Grenada’s broader biodiversity programmes. Community partners across St. Andrew, St. David, and the Grand Etang/Annandale landscapes also contribute local knowledge and site-level observations, strengthening the national understanding of where the frog persists.

Going forward, Gaea, Forestry, and Billie Harrison will collaborate on continued field surveys, range refinement, and long-term monitoring to support conservation planning for the species. This partnership ensures that research, management, and community knowledge move together toward the shared goal of maintaining the Grenada Frog across its upland forest habitats.