Asian Mantises Pose Growing Threat to Europe's Native Wildlife

Praying mantises have intrigued cultures worldwide for centuries, often regarded as mystical creatures or bearers of bad omens. Beyond their mythical presence, native mantises play vital ecological roles, indicating healthy, diverse ecosystems. However, the emergence of Asian mantis species has raised alarms among scientists regarding their impact on European wildlife.

New Classifications of Invasive Mantises

Recently published research in the Journal of Orthoptera Research has officially categorized two Asian mantis species, Hierodula tenuidentata and Hierodula patellifera, as Invasive Alien Species (IAS) in Europe. Conducted by Roberto Battiston and his team at the Museum of Archaeology and Natural Sciences "G. Zannato," the study focuses on the ecological repercussions of these species, which had not received substantial scientific scrutiny until now.

These mantises have been present in Europe for about ten years, but their populations have surged in the past few years, particularly in Mediterranean and continental areas. Battiston explains, "They are pushing increasingly further north, thanks to climate change." Established populations are being reported regularly in urban parks and gardens, often welcomed by the public and overlooked as potential ecological adversaries.

Destructive Behavior and Rapid Reproduction

Both Hierodula tenuidentata and Hierodula patellifera are formidable predators, flourishing primarily in trees and shrubs. They have a remarkable reproductive capability; each egg case can yield around 200 young, nearly double that of the native European mantis (Mantis religiosa). As juveniles are less cannibalistic, these invasive species can proliferate swiftly.

This rapid growth poses a serious threat to local wildlife. Native male mantises are often lured in by the females' mating calls, only to become prey themselves, which diminishes local mantis populations. Moreover, these invasive mantises prey on crucial pollinators like honeybees as well as protected species such as tree frogs and lizards, creating a significant ecological imbalance.

Impact on Biodiversity and Predation

Researchers highlight the urgent need to evaluate these impacts, especially on Mediterranean islands that host many unique species not found elsewhere. Interestingly, a notable finding reveals that domestic cats have become the primary vertebrate predator of these mantises, accounting for 45% of all recorded predation. Although this reduces the population of the invaders, cats cannot differentiate between invasive and native species, complicating the situation further.

Urban conditions also favor the expansion of these mantises. The architecture of cities offers perfect hunting grounds, while urban heat islands allow these mantises to remain active longer into the winter, extending their range and survival beyond natural limits.

Citizen Science as a Resource

To tackle this problem, scientists have enlisted the help of the public. Battiston notes that collaborations have generated extensive citizen science efforts, collecting over 2,300 reports from enthusiasts and casual observers. "Citizen science is a fundamental tool not only for monitoring but also for raising awareness about these issues," he says.

Public involvement can also go beyond reporting sightings. In winter, when foliage is sparse, the insects' oothecae—spongy brown egg cases measuring 2 to 3 cm—become easily identifiable on tree branches. Although people can remove these cases without harming the insects, Battiston cautions that consulting an expert beforehand is essential to ensure that native mantis eggs are not mistakenly removed.

The Bigger Picture

The proliferation of these Asian mantises serves as a stark reminder of how human actions and climate change can disrupt previously established ecological boundaries. As these adaptable predators continue their spread across Europe, fostering public awareness, enhancing citizen science initiatives, and implementing strategic conservation efforts will be vital for safeguarding the continent's native biodiversity.

Materials provided by Pensoft Publishers. Note: Content may be edited for style and length.

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