Rain forest provides pollinating beetles for atemoya crops.

Area of Science:

• Entomology
• Horticulture
• Conservation Biology

Background:

• Atemoya (Annona squamosa L. x A. cherimola Mill.) flowers are naturally pollinated by small beetles, primarily Nitidulidae.
• Commercial atemoya cultivation often requires labor-intensive hand pollination to ensure sufficient high-quality fruit yield.

Purpose of the Study:

• To investigate the potential of tropical rainforest-dwelling beetles as natural pollinators for atemoya crops in far north Queensland, Australia.
• To assess the relationship between proximity to tropical rainforest and the abundance and diversity of beetle pollinators in atemoya orchards.

Main Methods:

• Sampling of insects within 100 atemoya flowers across nine orchards situated at varying distances (0.1-24 km) from tropical rainforest.
• Exclusion experiments (bagging vs. open pollination) on 12 flowers per tree across 10 trees in an orchard near the rainforest to quantify insect pollination contribution.

Main Results:

• Five previously unrecognized native beetle species, likely originating from tropical rainforest, were identified as the primary visitors to atemoya flowers in orchards within 0.5 km of the rainforest.
• These native beetles positively influenced fruit quantity, but their abundance was insufficient to meet commercial production demands.
• Orchards further from the rainforest showed a lower diversity and abundance of these native beetle pollinators.

Conclusions:

• Native beetles from adjacent tropical rainforests can serve as pollinators for atemoya, enhancing fruit production.
• Current native beetle populations near atemoya crops do not eliminate the need for manual hand pollination in commercial settings.
• Management strategies focused on increasing native beetle abundance in agricultural landscapes are necessary to support both biodiversity conservation and agricultural productivity.