Non-Native Species Invasion

Non-native Species Invasion - Tree of Heaven and Spotted Lanternfly
Tree of Heaven and Spotted Lanternfly

As we look at the flora and fauna of our world, we see a beautifully designed system. Plants and animals sustain each other in a balanced network of life, but problems arise when humans do things that upset that balance. One way we do that is by accidentally or intentionally causing a non-native species invasion with no natural predator or forager. The species then has no control factor to balance it, and plant growth or animal reproduction becomes out of control.

An example of a non-native species invasion is the kudzu plant. This vine can grow up to a foot per day and is known as “the vine that ate the south.” It has taken over parks, roadsides, and forests in some areas. Kudzu vines wrap themselves around the trunks of native trees, out-competing their host for sunlight and even nutrients by girdling its bark and strangling the tree. 

Kudzu is native to Asia and some Pacific islands, but people brought it to North America as a decorative plant in the 1870s. As late as the 1940s, the U.S. government urged farmers to plant it to prevent soil erosion, and people promoted it as a fast-growing plant to shade porches. The consequences of human actions have become evident, costing millions of dollars.

One of the worst U.S. invaders is the inappropriately named tree of heaven (Ailanthus altissima ), native to areas of China and Taiwan. It was brought to the United States in 1784 as a decorative tree. However, its habits of sending out shoots, known as suckers, colonizing areas, and suppressing competition by producing chemicals that inhibit the growth and reproduction of other plants. This non-native species invasion also creates an objectionable odor and hosts another invasive species, the spotted lanternfly (Lycorma delicatula). Eradicating this “tree of hell,” as some call it, is difficult because if you cut it down, it will quickly regrow from new shoots.

All of these invasive species serve a purpose in their native lands, where they fit into the balance of the natural world. The problem comes when humans upset God’s balanced system. In many ways, humans have not been good stewards of the job God assigned us to “rule over” the Earth (Genesis 1:26) and “work it and take care of it” (Genesis 2:15). 

— Roland Earnst © 2023

References: Wikipedia- Kudzu in the U.S., Tree of Heaven, Spotted Lanternfly

Invasive Species and Environmental Problems

Invasive Species and Environmental Problems - Lionfish
Red Lionfish

It is interesting to hear skeptics blaming God for the existence of invasive plants and animals. There is no question that non-native species thrive in the United States. However, some species brought to this country have no natural predators to keep them in check. As a result, they cause crop damage, human health problems, and environmental damage. There are nearly 6,500 invasive species in America, and they cause more damage every year than all natural disasters combined. The stories of how they got here are interesting. Here are some examples:

NUTRIA – Also known as coypu or “swamp rats,” these South American rodents were brought to America by fur farmers in the 20th century.
BROWN GARDEN SNAIL – These mollusks were brought to California as food by French immigrants in the 1850s.
KUDZU – This Asian vine was brought to the U.S. as an ornamental plant in 1876, and farmers used it to feed livestock and reduce soil erosion. To make kudzu widely available to farmers, government agencies provided 85 million seedlings.
WILD BOAR – These animals were native to Eurasia and brought to the U.S. in the early 1900s for hunting. Early settlers in the 1500s introduced domestic pigs as a food source. Unfortunately, some escaped pigs mated with the boars resulting in the invasive species we have today.
LIONFISH – These beautiful fish with venomous spines are natives of the South Pacific and Indian oceans. Aquarium enthusiasts brought them to the U.S. between 1985 and 1992, but when released, they wipe out native fish populations.
DANDELION – Early European settlers brought these “weeds” to the U.S. for food and medicinal purposes.

These invasive species and others cause billions of dollars in economic damage annually. However, we should understand that not all non-native species are considered invasive. For example, corn and wheat are not native to the United States but were brought here as successful food crops.

In Genesis 9:3, God told Noah, “Everything that moves shall be food for you, just as I have given you green plants.” God has given us a wide variety of food sources designed to thrive in various ecological environments, but we must be good stewards of how we use and spread them.

Problems arise when people purposely or accidentally transport plants or animals to new locations where they become out of control. Without predators to control populations, they can throw an entire environment out of balance. Most of our environmental problems are human-caused, and invasive species of plants and animals are good examples.

— John N. Clayton © 2022

Reference: Discover magazine for September/October 2022 (pages 34 – 41)