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Invasive Harlequin Ladybird Carries Biological Weapons Against Native Competitors
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Invasive Harlequin Ladybird Carries Biological Weapons Against Native Competitors
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Journal Article
Invasive Harlequin Ladybird Carries Biological Weapons Against Native Competitors
2013
Overview
Invasive species that proliferate after colonizing new habitats have a negative environmental and economic impact. The reason why some species become successful invaders, whereas others, even closely related species, remain noninvasive is often unclear. The harlequin ladybird Harmonia axyridis, introduced for biological pest control, has become an invader that is outcompeting indigenous ladybird species in many countries. Here, we show that Harmonia carries abundant spores of obligate parasitic microsporidia closely related to Nosema thompsoni. These microsporidia, while not harming the carrier Harmonia, are lethal pathogens for the native ladybird Coccinella septempunctata. We propose that intraguild predation, representing a major selective force among competing ladybird species, causes the infection and ultimate death of native ladybirds when they feed on microsporidia-contaminated Harmonia eggs or larvae.
Publisher
American Association for the Advancement of Science,The American Association for the Advancement of Science
Subject
Animal, plant and microbial ecology
/ Animals
/ Asia
/ Beetles
/ Biological and medical sciences
/ Conservation, protection and management of environment and wildlife
/ Eggs
/ Fatal
/ Fundamental and applied biological sciences. Psychology
/ humans
/ Insects
/ Larvae
/ Parks, reserves, wildlife conservation. Endangered species: population survey and restocking
/ Species
/ Spores
/ Spots
