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Landscape Simplification Modifies Trap-Nesting Bee and Wasp Communities in the Subtropics.
Rachele S Wilson1,2, Sara D Leonhardt3, Chris J Burwell2,4,5
1Genecology Research Centre, University of the Sunshine Coast, 90 Sippy Downs Dr, Sippy Downs, Queensland 4556, Australia.
Insects
|December 4, 2020
Summary
Landscape simplification threatens tropical bees and wasps. Long-term studies show specialist species decline in simplified areas, emphasizing the need for functional diversity assessments in conservation.
Area of Science:
- Ecology
- Conservation Biology
- Entomology
Background:
- Tropical solitary bees and wasps face threats from landscape simplification.
- Limited long-term population data hinder conservation efforts.
- Understanding changes in community composition is crucial.
Purpose of the Study:
- To investigate how landscape simplification affects tropical bee and wasp community composition, diversity, and abundance.
- To assess the influence of seasonal variations on these insect populations.
- To identify specific traits of bees and wasps vulnerable to habitat changes.
Main Methods:
- 336 timber and cob trap nests were deployed in forests and orchards over 23 months.
- Trap nests were serviced seasonally, and emergent bees and wasps were identified.
- Data collected in south-east Queensland, Australia, a subtropical biodiversity hotspot.
Main Results:
- 28 wasp and 13 bee species were identified from 2251 brood cells.
- Community composition shifted with landscape simplification; specialist and parasitoid species were absent in simplified areas.
- Bee and wasp abundance and diversity were not affected by landscape simplification but correlated positively with rainfall.
Conclusions:
- Landscape simplification impacts the community composition of bees and wasps, favoring generalist species.
- Long-term, multi-year studies are essential for accurate population assessments.
- Focusing on functional diversity is key to detecting subtle changes in bee and wasp populations.
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