Increased pollinator habitat enhances cacao fruit set and predator conservation

Area of Science:

• Ecology
• Agricultural Science
• Conservation Biology

Background:

• Wild pollinators are crucial for agricultural crop productivity.
• Habitat loss and pesticide use threaten wild pollinator populations, reducing pollination services and crop yields.
• Habitat management strategies can mitigate negative agricultural impacts on pollinators and enhance pollination services.

Purpose of the Study:

• To evaluate the impact of adding cacao fruit husks to a monoculture cacao farm on pollination services and predator densities.
• To assess the effect of cacao fruit husk addition on pollen limitation.
• To determine if pollinator and predator conservation efforts are compatible within a specialized agricultural system.

Main Methods:

• Cacao fruit husks were added to a monoculture cacao farm as a habitat management practice.
• Pollination services were assessed by measuring fruit set and yield.
• Densities of entomophagous predators (spiders and skinks) were monitored.
• Pollen limitation was evaluated by crossing habitat manipulation with pollen supplementation treatments.

Main Results:

• Cacao fruit husk addition increased the number of fruits per tree.
• Increased fruits per tree and hand pollination treatments led to higher final yields, indicating enhanced pollination services by midges.
• Cacao fruit husk addition increased the densities of spiders and skinks.
• Predator conservation did not negatively impact pollination through pollinator capture or deterrence.

Conclusions:

• Moderate habitat management, such as adding cacao fruit husks, can support both pollinator and predator conservation in specialized agricultural systems.
• This practice enhances pollination ecosystem services and agricultural production.
• The findings demonstrate a compatible relationship between agricultural production and biological conservation, offering a win-win scenario.