invasive species Archives - DOES GOD EXIST? TODAY

July 20, 2023July 19, 2023

Non-Native Species Invasion

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).

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

September 9, 2022September 7, 2022

Invasive Species and Environmental Problems

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.

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

January 20, 2021January 20, 2021

Native Plants Are Best for Birds

One of the ecological issues of recent years has been the role of invasive species and how they affect local birds and mammals. Recent studies show that berries produced by native plants are best for birds. Besides that, the birds prefer local varieties over the fruits of introduced species.

Studies of native bayberries have shown that they contain more fats, carbohydrates, and nutrients that birds need to survive. Amanda Gallinat of Utah State University said that invasive fruits are usually nutrient-poor. For people who enjoy watching birds, that is something to keep in mind when choosing plants for their yards.

Viburnums such as arrow-wood viburnum produce berries that are high in fats and carbohydrates, which help birds prepare for making long migration flights. For birds that stay around in the cold weather, another factor that favors native plants is how long they hang on to their berries. Winterberry is a native holly that can hold its berries well into the cold months.

When you talk about the design built into the migrations and lives of birds, it is not just the birds’ design but also the design of the nutritional system that supports them. Native plants are best for birds because they often give the birds better nutritional support than species brought in from other areas of the world.

God’s design for life is best, but humans often introduce non-native plants and animals that sometimes become invasive species. People may introduce non-native species with good intentions, or perhaps invasive species arrive by accident with foreign cargo. Either way, we must learn to be better stewards of the planet over which God gave us dominion. (See Genesis 1:28.)

Data from National Wildlife, February-March 2021, page 12.

December 22, 2020December 21, 2020

Christmas Holly Is a Reminder

It’s an evergreen tree that can live for 500 years and grow up to 33 feet (10 meters) tall. However, it usually doesn’t live for more than 100 years or grow taller than 10 feet (3 meters). It is often associated with Christmas because people use it in wreaths and garlands, and you see it pictured on many Christmas cards. What does European (or English) holly (Ilex aquifolium), also known as Christmas holly, have to do with Christmas?

The connection to Christmas goes back to medieval times in Europe. People said that the sharp-pointed evergreen leaves reminded them of the crown of thorns Christ was forced to wear at His crucifixion. The berries, which are red during the Christmas season, reminded them of the blood Christ shed, and the white flowers stand for purity.

European holly grows as a tree or a bush. The berries are mildly toxic to people and harmful to dogs or cats. However, they provide winter food for birds, rodents, and other animals. The flowers are sources of nectar for bees and butterflies. European holly grows in shady areas in forests, and it can form a dense thicket along forest borders. Because it is a dense evergreen with sharp points, people often use it for privacy hedges.

In its native areas of Europe and other regions, holly is an ornamental plant admired for its beauty. However, since people brought it to North America’s west coast, it has become an invasive species. It thrives in the shade of forests and crowds out species native to that area. Washington state has called it a weed.

Like other plant species, European holly has an ecological niche to fill. Problems often arise when people do something to upset the balanced relationship that God has designed into nature. From the beginning, humans have done things to upset our relationship with God. That brings us back to Christmas and the reason God came to Earth in the form of a human who lived a pure life and shed His blood on the cross to redeem us. Christmas holly reminds us of that.

March 30, 2019March 26, 2019

Alien Invasions Causing Extinctions

Alien Invasions such as the Brown Tree Snake on Guam cause extinctions

New research published in the journal Frontiers in Ecology and the Environment on March 4, 2019, indicates that alien invasions are causing extinctions of native animals. Humans are mostly to blame.

When humans throw the world of plants and animals out of balance, the result is extinctions. We can destroy God’s designed balance when we introduce a non-native species into an environment. The introduced species without natural predators uses up local resources leaving native species without food. There are many examples.

One example is the brown tree snake (Boiga irregularis) which was accidentally introduced to Guam aboard a military cargo ship after World War II. Those snakes are native to Australia and Indonesia where natural predators control them. On Guam, they have decimated 50 percent of the native bird and lizard species and two of the three bat species on the island. The brown tree snakes considered those native species to be tasty treats, and the snakes had no predators to control them. The result was the extinction of many species, some of which existed nowhere else on Earth. Alien invasions of brown tree snakes forever changed the ecosystem of Guam.

In other cases, humans throw nature out of balance by their direct actions. An example of that is the over-hunting of sea otters. Sea otters kept the purple sea urchins in check. Steller’s sea cows (Hydrodamalis gigas)were giant relatives of manatees, and they lived on kelp. Without control by sea otters, the purple sea urchins ate so much of the kelp that Steller’s sea cows had no food, and they became extinct. However, the research project indicated that direct interference by humans in cases like this has less impact on extinctions than the alien invasions have.

Sometimes humans make the mistake of bringing in another non-native species to control the first one. That technique often makes the problems worse. Usually, by the time people discover the problem of alien invasions, it’s too late to fix it.

The research concludes that 25 percent of plant extinctions and 33 percent of animal extinctions were caused by alien invasions – the introduction of non-native species. The bottom line is that humans have not been good stewards of the planet God has given us to enjoy and protect. God gave humans the responsibility to have dominion over creation and “rule over the fish of the sea and the birds of the air and over every living creature that moves on the ground” (Genesis 1:28). Romans 13:1-4 indicates that those who rule over people have the responsibility to protect. We might say the same of us who rule over the creatures.