Entry Category: Science and Technology - Starting with L

The Laconia Circle Levee is situated in the southeast corner of Mississippi Township in Desha County. The levee’s circular construction is so unique that Believe it or Not, a syndicated newspaper publication for the unusual, featured the levee in one of its 1970s publications. The levee encircled Laconia Circle, which consisted of 18,000 acres of Delta land located in Desha County, for protection against potential flooding from the Mississippi and White rivers. It was the first levee in the Arkansas Delta to be affected by the Flood of 1927. Before the Civil War, fourteen plantation homes were protected by the levee. The levee and the township were named after the Laconia Landing, one of the most active steamboat landings on …

Lampreys are primitive jawless fishes in the Family Petromyzontidae, Order Petromyzontiformes, Class Petromyzontida, and Superclass Cyclostomata. The common name “lamprey” is almost certainly derived from the Latin lampetra, which likely means “stone licker” (lambere “to lick” + petra “stone”). They are also sometimes called lamprey eels, although they are not eels. Instead, lampreys are the direct descendants of the first armored jawless fishes or ostracoderms, which first appeared over 400 million years ago during the Silurian and Devonian periods. Today, there are only two remaining groups of jawless fishes: the lampreys and the hagfishes (Order Myxiniformes, Class Myxini). Hagfishes, which resemble lampreys, are the sister taxon of lampreys based on DNA evidence. There are about forty-two living lamprey species in …

The Lavacaberry is a hybrid variety of berry that takes its name from the town of Lavaca (Sebastian County), where it was planted extensively in the 1940s. The introduction of the berry to the town helped reinvigorate the local economy at a time when the effects of the Depression were still being felt. In 1937, the Lavaca School District hired Idus H. Fielder as a vocational instructor. In his eagerness to help local growers, Fielder met Ed Girard, a local farmer, to discuss the plight of the farmers. After listening to Girard and others, Fielder remembered a berry from the farm of R. E. Hallett in McRae (White County). The berry was known as a “California Red Raspberry,” and Hallett …

Leeches are segmented worms belonging to the Phylum Annelida, Class Clitellata, Subclass Hirudinida. Leech classification is primarily based on the presence or absence of setae (bristles) and the morphology of the mouth, proboscis (feeding organ), jaws, and suckers. Leeches are thought to have evolved from certain oligochaete worms; however, the systematics and taxonomy of leeches are in need of review. Twenty-two species within five families (Erpobdellidae, Glossiphoniidae, Haemopidae, Hirudinidae, Piscicolidae) have been reported from northern Arkansas, but, as of 2018, there are no summaries of leeches from the southern part of the state. Leeches are bilaterally symmetrical, with thick muscular bodies. Usually, they are dorsoventrally flattened and segmented. Some leeches are long and worm-like (ranging in size from about seven …

Lice belong to the Phylum Arthropoda, Class Insecta, Order Phthiraptera, with four suborders: Anoplura (sucking lice), occurring on mammals exclusively; Rhynchophthirina, parasites of elephants and warthogs; Ischnocera, which are mostly avian lice, though one family parasitizes mammals; and Amblycera, a primitive suborder of chewing lice, widespread on birds but also infesting South American and Australasian mammals. The chewing lice (suborders Rhynchophthirina, Ischnocera, and Amblycera) were previously combined in the order Mallophaga, which did not reflect natural grouping. There are nearly 5,000 described species of lice, with about 4,000 being parasitic on birds and 800 on mammals, within about twenty-six families of described species of phthriapterans. Many mammal species can be infested by sucking lice, including seals and walruses. These “marine …

A lichen is a composite organism that is the result of a simple photosynthesizing organism (green algae or cyanobacteria/blue-green algae) living among filaments (hyphae) of multiple fungi species in a mutually beneficial symbiotic relationship. Although lichens had been recognized as organisms for many years, it was not until 1867, when Swiss botanist Simon Schwendener (1829‒1919) proposed his dual theory of lichens, that the true nature of the lichen association began to emerge. The green algae or cyanobacteria benefit by being protected from the environment by the filaments of the fungi, which also gather moisture and nutrients from the environment, and (usually) provide an anchor to it, whereas the fungi benefit from the carbohydrates produced by the green algae or cyanobacteria …

The Lost 40 is a forty-acre tract of mature forest along Wolf Branch (a tributary of Moro Creek) in southeastern Calhoun County. Owned by PotlatchDeltic Corporation, the tract is known for its large trees, some more than 200 years old, and has variously been described as “primary,” “virgin,” and “old-growth.” It has been the site of several scientific studies conducted by the faculty and students of the University of Arkansas at Monticello (UAM) School of Forestry and Natural Resources, and is protected by a forty-year cooperative management agreement between PotlatchDeltic and the Arkansas Natural Heritage Commission (ANHC) signed in 1996. Lost Forty Brewing, a brewery based in Little Rock (Pulaski County), takes its name from the tract. Several natural communities …