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Alien Invaders in the Florida Everglades

Close up of an alligator head barely above water with long grasses in the foreground.
An alligator hides within the water of the Everglades. Photograph © Daniel Martone.

A few month in the past, I beseeched vacationers to assist the eight nationwide parks most endangered by the Deepwater Horizon oil spill. Sadly, this devastating spill has but to be contained, which signifies that the parks, seashores, islands, and wetlands alongside America’s Gulf Coast proceed to face the ecological fallout now and sooner or later. On a current journey to a Florida seashore, for instance, my father reported seeing tar balls alongside the shore and oil slicks within the distance. As tragic as this example is, nevertheless, it’s essential to notice that main cataclysmic occasions like oil spills, fires, and hurricanes aren’t the one threats to our nationwide parks and different U.S. journey locations. Even with out intentional malice, unaware guests may cause their very own share of injury to those valuable assets.

As I mused final yr on one in every of my different blogs, it’s typically bugged me that, within the basic tearjerker E.T.: The Additional-Terrestrial, little Gertie presents a geranium plant to a hapless member of an alien race. Though her intentions are pure, the unlucky reality is that the introduction of even the smallest rodent, fish, plant, insect, microbe, or different unique organism right into a overseas ecosystem can have devastating penalties for native inhabitants—even aliens. Simply contemplate how tiny Formosan termites, which by accident arrived by way of American ships coming back from the Pacific throughout World Struggle II, have prompted hundreds of thousands of dollars in injury, repairs, and pest management all through the historic French Quarter of New Orleans. Like such ferocious super-termites, many undesirable animals, bugs, crops, and different pests have unfold from area to area by wind, water, birds, vessels, and automobiles, however many others are transferred by people, both accidentally (as with many recreationists and vacationers) or by design (as with shoppers of unique pets and horticulture), with out understanding the doubtless dangerous results of their conduct.

To raised comprehend this alien “bioinvasion,” it’s useful to know the important thing terminology concerned. A local species is one that happens in a specific habitat, ecosystem, or area with out direct or oblique human actions. Each organism on the planet—whether or not plant, animal, insect, fungi, or micro organism—is native to some locale, the place it’s in all probability existed for hundreds of years resulting from pure forces like local weather, storms, moisture, hearth, soil, and species interactions. In North America, native species are thought-about people who occurred previous to European settlement. Roughly 18,000 crops are native to this continent, serving as the inspiration for quite a lot of landscapes in addition to offering sources of meals, fiber, and different requirements.

Nonnative species, in the meantime, are organisms that happen artificially in locales past their pure ranges. Also referred to as unique, overseas, launched, nonindigenous, and alien species, such nonnatives can do irreparable injury to fragile ecosystems in the USA, whether or not they’re by accident or deliberately transported between continents or from one a part of the nation to the opposite. In America, nonnative invaders and habitat destruction have led to the extinction of roughly 200 native plant species because the 1800s. That’s as a result of, with out pure enemies of their new habitats, these aliens shortly proliferate by preying on or hybridizing with native populations, polluting meals provides, degrading native habitats, and introducing deadly pathogens.

In fact, not all nonnative species are harmful. With out such exotics as honeybees, kiwi fruit, soybeans, and tulips, American shoppers would nonetheless be restricted to the a number of dozen crops that existed previous to 1492. Nonetheless, regardless of some great benefits of sure nonnatives, all such aliens can have an effect on the current stability of nature, typically in damaging methods. Simply contemplate anglers who’ve by chance transferred parasites from shoreline mud to wholesome waters by way of contaminated boots and gear, households who’ve launched undesirable and probably diseased goldfish and cats into the wilderness, householders who’ve used smothering water hyacinths and English ivy to embellish their gardens, and rich landowners who imported Indian peacocks, prized for his or her decorative feathers, in the course of the late 1800s, solely to have them overrun numerous zoos and sanctuaries, subsequently uprooting or smothering fledgling crops.

Many nationwide parks have been adversely affected by such alien invaders. In Hawaii Volcanoes Nationwide Park, as an example, feral cats and pigs have unfold lethal mosquitoes, cleared pathways for unique crops, and preyed upon fragile orchids, ferns, and different native species, whereas grizzly bears and different animals in Yellowstone Nationwide Park have suffered a lack of sustenance because of the unlawful introduction of deep-water lake trout, which devour different native fish. Whereas researching southern Florida for my upcoming journey information Moon Florida Keys, I found that a number of invasive plant species are presently threatening native plant populations in Everglades Nationwide Park (40001 S.R. 9336, Homestead, 305/242-7700), which may, in flip, have an effect on different native inhabitants, resembling alligators. Such alien invaders embrace:

Australian pine: (Casuarina equisetifolia) Native to Australia, Malaysia, and southern Asia, this tall, fast-growing pine tree was launched to Florida within the late 1800s for the needs of ditch and canal stabilization, shade, and lumber. In the present day, dense thickets have displaced native dune and seashore vegetation; radically altered the sunshine, temperature, and soil chemistry of seashore habitats; inhibited the expansion of native crops, upon which native bugs and different wildlife rely; and elevated seashore and dune erosion, which has affected the nesting actions of sea turtles and American crocodiles.

Brazilian pepper: (Schinus terebinthifolius) Because the identify signifies, this bushy, spreading evergreen tree hails from Brazil, Argentina, and Paraguay. Given its fragrant leaves, white flowers, and pink berries, it’s no marvel that the Brazilian pepper was imported as a decorative within the 1840s. Since then, nevertheless, the seeds of this fire-resistant, salt-tolerant plant have unfold, ensuing within the formation of dense monocultures in farmlands, pinelands, hardwood hammocks, and mangrove forests. As an unlucky bonus, chemical compounds within the pretty leaves, flowers, and berries can irritate human pores and skin and respiratory passages.

Latherleaf: (Columbrina asiatica) Discovered alongside coastal areas of japanese Africa, India, Southeast Asia, Australia, and the Pacific Islands, this sprawling bush was introduced from Asia to Jamaica by immigrants within the 1850s. From there, the seeds, which might be dispersed by tides and storms, in all probability floated to southern Florida on ocean currents. These days, latherleaf has invaded coastal seashores and dunes, pine and hardwood forests, and mangrove estuaries, smothering native vegetation and threatening to type a monoculture if left uncontrolled.

Melaleuca: (Melaleuca quinquenervia) Initially from Australia, New Guinea, and the Solomon Islands, this subtropical tree was launched to southern Florida within the early 1900s for landscaping and “swamp drying” functions. At the moment, the fast-spreading melaleuca is the best menace to the Everglades ecosystem, which faces excessive and maybe irreversible alteration due to the tree’s potential to transform native plant communities like sawgrass marshes and moist prairies into impenetrable thickets.

Previous World climbing fern: (Lygodium microphyllum) Native to Australia, Africa, and tropical Asia, this intertwining vine was launched to Florida within the 1960s as a panorama decorative. Since then, the climbing fern, which has a dense root system, has blanketed pine forests, cypress swamps, and different Floridian habitats; altered the water movement by means of streams and wetlands; and offered gasoline for fires that might not usually unfold by way of a wetland space.

Seaside mahoe: (Thespesia populnea) Indigenous to the tropical seashores of Africa and India, this tall, flowering tree was delivered to Florida as a decorative for coastal landscapes within the 1920s. Since then, the seaside mahoe has invaded shoreline habitats, the place its dense shade has smothered its rivals. Sadly, its seeds float in seawater, which suggests it may possibly additionally experience the ocean currents to colonize different unsuspecting shores.

Administration strategies range from plant to plant, and a few are undoubtedly simpler than others. Through the years, biologists have struggled to struggle the melaleuca, for instance, with herbicides, managed fires, and melaleuca snout beetles. Sadly, they’ve found that timber can grow to be immune to herbicides, fires can truly unfold the seeds, and launched bugs can assault non-target organisms. As a result of nonnative species don’t acknowledge regional borders, the important thing to limiting the dangerous impacts of invasives is to stop them from turning into established within the first place. Since most unique species don’t pose a menace till years after they’ve been launched, it’s essential for people to pursue actions that guard America’s distinct lands, waters, and nationwide parks from such alien critters. To stop the introduction or unfold of all invasive crops, you’ll be able to take the next actions:

  • Keep away from disturbance to pure areas, resembling clearing native vegetation, planting nonnatives, and dumping yard wastes
  • Chorus from using unique species in your landscaping, land restoration, or erosion management tasks
  • Use ornamentals which might be native to your native area
  • Seek the advice of an area college, arboretum, nature middle, native plant society, or Division of Agriculture workplace when you have any considerations a few plant that you simply intend to develop
  • Use methods similar to slicing, mowing, pruning, or herbicide to take away or handle any invasive exotics
  • Ask native nurseries and backyard outlets to not promote invasive unique crops
  • Notify land managers about invasive unique plant occurrences
  • Help in unique plant removing tasks
  • Work together with your native authorities to encourage using native crops in city and suburban landscapes
  • Watch out to not transport unique animals, crops, and microbes (even on tenting gear, fishing provides, and the soles of your footwear)

Such precautions—nevertheless tedious they could appear—will go a great distance in serving to to protect the pure state of our nationwide parks and different valuable areas for many years (and, hopefully, centuries) to return—so long as they’re not completely broken, that’s, by main oil spills and the like.


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