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posted by janrinok on Sunday February 11, @02:23PM   Printer-friendly

https://phys.org/news/2024-02-alien-invasion-native-earthworms-threaten.html

An alien invasion capable of triggering catastrophic changes is underway across North America. At least 70 imported earthworm species have colonized the continent, and represent a largely overlooked threat to native ecosystems, according to a new study by researchers at Stanford University, Sorbonne University, and other institutions.

The analysis, published Feb. 8 in Nature Ecology & Evolution, provides the largest ever database of such earthworms and warns of the need to better understand and manage the invaders in our midst.
...
Mostly invisible and largely unappreciated, earthworms are worth their weight in gold to farmers and gardeners because their movement creates tunnels that allow air, water, and nutrients to penetrate, while their waste serves as a rich fertilizer.

They also play a central role in many processes that cascade to aboveground communities and the atmosphere. For example, although mechanical movement through the soil by earthworms may initially release carbon dioxide, the longer-term impacts of digesting organic material result in a net increase in sequestered carbon where earthworms are present.

Since the late 1800s, people looking to capitalize on these services have brought earthworms to North America from Asia, Europe, South America, and Africa. In some places, these non-native introductions have successfully enhanced the agricultural economy. However, in other cases, they have been detrimental. These transplants are more likely to consume aboveground leaf litter than native earthworms, altering habitat quality in a way that can hurt native plants, amphibians, and insects.

In the northern broadleaf forests of the U.S. and Canada, alien earthworms' impact on soil stresses trees such as sugar maples by altering the microhabitat of their soils. This, in turn, sets off a string of food web impacts that help invasive plants spread. Ironically, for a creature synonymous with improving soil, some alien earthworms may alter soil properties such as nutrients, pH, and texture, leading to poorer quality crops, among other impacts.

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For their study, the researchers drew on thousands of records from 1891 to 2021 to build a database of native and alien earthworms, then combined it with a second database documenting U.S. border interceptions of alien earthworms between 1945 and 1975. With the aid of machine learning, the team used the combined databases to reconstruct assumed introduction pathways and spread of alien earthworm species.

They found alien earthworm species in 97% of studied soils across North America, with alien occupation higher in the northern part of the continent and lower in the south and west. Overall, aliens represent 23% of the continent's 308 earthworm species, and account for 12 of the 13 most widespread earthworm species. By comparison, in the U.S. only 8% of fish species, 6% of mammal species, and 2% of insects and arachnids are alien.

In Canada, the proportion of alien earthworms is three times greater than that of native earthworms. Across most of the lower 48 U.S. states and Mexico, there is about one alien earthworm for every two native species.

More information: Jérôme Mathieu et al, Multiple invasion routes have led to the pervasive introduction of earthworms in North America, Nature Ecology & Evolution (2024). DOI: 10.1038/s41559-023-02310-7


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  • (Score: 2, Interesting) by khallow on Sunday February 11, @06:00PM

    by khallow (3766) Subscriber Badge on Sunday February 11, @06:00PM (#1343990) Journal
    One thing to keep in mind is that while there's not a lot of impacts from the end of the last glacial period, earthworm distribution is one. The ice retreated about 12k years ago, and earthworms don't move that fast. So native earthworms still haven't naturally moved into habitat that would be their natural homes. For example, my home, Yellowstone National Park actually has large parts that haven't been colonized by earthworms yet, and the great majority of earthworms it has now were imported by humans in the last two centuries.

    They found alien earthworm species in 97% of studied soils across North America, with alien occupation higher in the northern part of the continent and lower in the south and west. Overall, aliens represent 23% of the continent's 308 earthworm species, and account for 12 of the 13 most widespread earthworm species. By comparison, in the U.S. only 8% of fish species, 6% of mammal species, and 2% of insects and arachnids are alien.

    Notice the emphasis on "alien occuptation higher in the northern part of the continent"? Those are the regions least colonized by North American earthworms in the first place and thus most vulnerable to colonization by non-native earthworm species.

  • (Score: 2, Touché) by Runaway1956 on Sunday February 11, @07:19PM (1 child)

    by Runaway1956 (2926) Subscriber Badge on Sunday February 11, @07:19PM (#1343997) Journal

    These earthworms were introduced to the Americas decades ago, even hundreds of years ago. They've "escaped" whatever controls they might have had.

    So, what's the solution today? Do I dig up my land, down to 100 feet, sift out all the worms, and destroy the invasive species? Yeah - right. And, even if I could do that, what other beneficial organisms am I destroying in the process?

    Meanwhile, before I've even finished my own property, those "bad" worms are re-invading from the neighbor's property!

    Trying to get control of earthworms is beyond hope, people. I'm not even going to give it any serious thought.

    --
    ‘Never trust a man whose uncle was eaten by cannibals’
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