These findings provide important context for the global study of insect<\/a> decline. While most research has focused on habitat loss, climate change<\/a>, and pollution<\/a>, the role of biological<\/a> invasions has received much less attention.<\/p>\n A Global Pattern of Invasion<\/p>\n This research is the first global attempt to measure how invasive alien species impact insect populations. The team examined ecological data from six continents using studies that tracked changes in insect populations after the introduction of non-native plants and animals.<\/p>\n Instead of analyzing individual case studies, the researchers searched for patterns that appeared across different regions and ecosystems. They found that, on average, invasive animals lower insect numbers by preying on them or competing for resources. Invasive plants often replace native vegetation that insects need for food and reproduction.<\/p>\n Some insect groups were impacted more than others. The study found that Hemiptera, or true bugs, declined by an average of 58%. Hymenoptera, which include ants, bees, and wasps, dropped by 37%. Orthoptera, such as grasshoppers and crickets, fell by 27%. Beetles, however, were less affected with an average decline of 12%.<\/p>\n \u201cIdentifying the insects most vulnerable to biological invasions will support better prioritisation of habitat management and also action to prevent and control invasive alien species. This is particularly important when resources are limited,\u201d said Grace Skinner, a data scientist at UKCEH and lead author of the study.<\/p>\n Overlooked Implications<\/p>\n Invasive alien species have not been a major focus in insect conservation research. Although the Intergovernmental Science-Policy Platform on Biodiversity and Ecosystem Services<\/a> lists invasive species as one of the five main causes of biodiversity loss, their effects on insects have been studied less than those of urbanization or nutrient pollution.<\/p>\n This study helps bridge that gap by demonstrating that biological invasion affects insects worldwide, not just in isolated areas.<\/p>\n \u201cIt is crucial that we recognise insects not just as invaders but also as victims of invasion. Insects are undergoing concerning declines across the world, and as this trend continues, essential ecosystem services will increasingly be at risk,\u201d said Skinner.<\/p>\n Causes of Invasion<\/p>\n The authors point out that invasive species are just one part of a bigger set of problems. Ongoing global trade and transportation facilitates the spread of non-native species, while rising temperatures make it easier for some invaders to survive and thrive.<\/p>\n \t\t
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