The social parasite that hijacks entire colonies to build empires
In short: The southern yellowjacket is a master of biological real estate. While most wasps build from scratch, this species often prefers a hostile takeover, invading the nests of other species to build massive, multi-queen empires that can house hundreds of thousands of cells.
Vespula squamosa, the southern yellowjacket, exhibits a complex parasitic relationship with other species like V. vidua and V. maculifrons. In a process that begins with a violent takeover, approximately 85% of southern yellowjacket colonies start by infringing on a small host colony. The queen may fight off other queens—a behavior evidenced by numerous dead queens found in nests—to seize control. Once the usurpation is successful, the southern yellowjacket builds its own nest around the host's structure, effectively expanding the original real estate.
The species also demonstrates remarkable social plasticity based on climate. In cooler regions, they typically form annual colonies where workers die off in winter. However, in warmer southern climates like Florida, they can form perennial nests. These multi-season colonies are often polygynous, meaning they house multiple reproductive queens (ranging from six to over 100). While scientists once argued that multiple queens might breed disease or reduce fitness, these large nests appear to tolerate the competition by reducing interactions between the queens.
The scale of these colonies is staggering. While typical nests are smaller, perennial nests can reach volumes of 50-60 liters and contain at least 60,000 cells. One massive reported nest in a pine tree occupied a diameter of 114.3 centimeters and featured over 50 combs in the trunk section alone. These colonies are supported by a sophisticated chemical defense system: workers use alarm pheromones, such as N-3-methylbutylacetamide, to coordinate attacks against threats, while the queen produces distinct pheromones to attract mates.
Despite their predatory nature—feeding on live insects like spiders and caterpillars—southern yellowjackets are primarily considered pests due to their abundance in urban environments. Because they often nest in unnatural habitats like yards, parks, and walls, their proximity to humans leads to frequent defensive stings. Their venom contains complex proteins, including phospholipase and hyaluronidase, which are chemically similar across different wasp genera.
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Sources
- Summary by Intellect · source: Vespula squamosa
- Also: Social structure of perennial <i>Vespula squamosa</i> wasp colonies.
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