Molly Ayala
Electric eels are a genus of neotropical freshwater fish from South America. They are known for their ability to stun prey by generating electricity. For over two centuries, the electric eel was believed to belong to a single species: Electrophorus electricus. However, in 2019, researchers identified three distinct species of electric eels, distributed across Greater Amazonia. These species differ in their physiology, habitat, and electric power. The discovery of multiple electric eel species highlights the biodiversity of the Amazon rainforest and the importance of further exploration and conservation efforts.
| Characteristics | Values |
|---|---|
| Number of Species | 3 |
| Genus | Electrophorus |
| Species | Electrophorus electricus, Electrophorus voltai, Electrophorus varii |
| Length | 6-8 feet (2-2.5 meters) |
| Habitat | Swamps, streams, creeks, and rivers across northern South America, including Brazil, the Guianas, Suriname, Venezuela, Colombia, Ecuador, and Peru |
| Diet | Fish, crustaceans, insects, and small vertebrates such as amphibians, reptiles, and mammals |
| Behavior | Nocturnal, obligate air-breathing, poor vision, electrolocation for hunting |
| Reproduction | Female lays 1,200-1,700 eggs during the dry season; males construct nests and guard larvae until the rainy season |
| Conservation Status | Not endangered, listed as a species of least concern |
| Electric Discharge | Up to 860 volts |
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What You'll Learn
- Electric eels were long believed to be a single species
- In 2019, scientists identified three distinct species
- The three species are Electrophorus electricus, Electrophorus voltai, and Electrophorus varii
- The species differ in genetics, habitat, and electric power
- The discovery highlights the importance of protecting the Amazon rainforest
Electric eels were long believed to be a single species
The three species of electric eels are distributed across Greater Amazonia and have subtle physical differences, such as the flatness of their heads and the number of pressure-sensitive pores on their flanks. They also differ in their habitats, with Vari's eel living in lowland floodplains with murky and oxygen-deprived waters, while Linnaeus's eel is found in northern Amazonia and Volta's eel inhabits the southern region, both in highland rivers with well-oxygenated and clear waters.
The three species of electric eels also vary in their electrical power, with one of the new species capable of generating a discharge of 860 V, significantly higher than the previously recorded 650 V for Electrophorus. This discovery highlights the potential for exploring unique systems of electrogenesis and discovering new substances and bioelectrogenic functions.
The identification of these three species of electric eels underscores the importance of further research and conservation efforts in the Amazon rainforest, one of Earth's biodiversity hotspots. It also provides opportunities to investigate how animals generate high-voltage electricity and the potential applications in medicine and technology.
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In 2019, scientists identified three distinct species
Electric eels are a genus of neotropical freshwater fish from South America. They are known for their ability to stun prey by generating electricity, delivering shocks of up to 860 volts. For over two centuries, the electric eel was believed to be monotypic, containing only Electrophorus electricus. However, in 2019, scientists identified three distinct species of electric eels: Electrophorus electricus, Electrophorus voltai, and Electrophorus varii.
The discovery of these three species was based on DNA divergence, ecology and habitat, anatomy and physiology, and electrical ability. Genetic comparisons revealed that these species evolved from a shared ancestor around 7.1 million years ago. One group, the common ancestor of E. voltai and E. electricus, inhabited the ancient highlands, while E. varii lived in the lowlands, where the murky and mineral-rich waters conducted electricity more efficiently.
The three species of electric eels differ not only in their genetics and habitat but also in their physical characteristics and electrical power. For example, E. varii, named after the late Smithsonian ichthyologist Richard Vari, is found in the murky, slow-flowing lowland waters, while E. voltai, named after the Italian physicist Alessandro Volta, primarily inhabits the highland regions of the Brazilian Shield.
The identification of these three species highlights the diverse nature of the Amazon rainforest and the importance of protecting this threatened environment. It also provides new opportunities to investigate how animals generate high-voltage electricity and the potential for discovering unique compounds and technologies.
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The three species are Electrophorus electricus, Electrophorus voltai, and Electrophorus varii
Electric eels, despite their name, are not true eels but are members of the electroreceptive knifefish order Gymnotiformes. In 2019, what was previously considered a monotypic genus—containing only Electrophorus electricus—was reclassified into three species: Electrophorus electricus, Electrophorus voltai, and Electrophorus varii.
Electrophorus electricus
E. electricus is a South American freshwater fish. It has a distinctive elongated, cylindrical body, typically growing to about 2 metres (6 feet 7 inches) in length and weighing around 20 kilograms (44 pounds). Its coloration is dark grey-brown on the back and yellow or orange on the belly, with mature females having darker abdomens. They have no scales, a square-shaped mouth positioned at the end of the snout, and an anal fin that extends the length of the body to the tip of the tail. As obligate air-breathers, they must rise to the surface every ten minutes or so to inhale. E. electricus has three pairs of abdominal organs that produce electricity: the main organ, Hunter's organ, and Sachs' organ. These organs give the electric eel the ability to generate two types of electric organ discharges: low voltage and high voltage. Despite being the first described species in the genus, E. electricus has the weakest maximum voltage of the three species, at only 480 volts.
Electrophorus voltai
Also known as Volta's electric eel, E. voltai is named in honour of the physicist Alessandro Volta, widely credited as the creator of the electric battery. It is the strongest known bioelectricity generator in nature, producing up to 860 volts. This species closely resembles E. electricus but differs in skull morphology, with a depressed skull and a wide head. It inhabits upland habitats, primarily north-flowing rivers of the Brazilian Shield, and some south-flowing rivers of the Guiana Shield. E. voltai can reach 2.5 metres (8 feet 2 inches) in length and weigh up to 22 kilograms (49 pounds), making them the largest species of the Gymnotiformes.
Electrophorus varii
E. varii closely resembles E. electricus but lacks the clear band along the body that is usually present in E. electricus. It produces the second-highest maximum voltage of the three Electrophorus species, at about 572 volts. E. varii populations are found in the Amazon basin, Brazilian Shield, and other parts of the Guiana Shield.
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The species differ in genetics, habitat, and electric power
Electric eels were long believed to belong to a single species, Electrophorus electricus. However, in 2019, researchers at the Smithsonian's National Museum of Natural History discovered that electric eels in the Amazon basin belong to three distinct species: Electrophorus electricus, Electrophorus voltai, and Electrophorus varii. These three species differ in genetics, habitat, and electric power.
Genetically, the three species of electric eels differ by 6 to 10 percent of their DNA, while individuals within each species differ by 0.3 percent at most. This suggests that the eels last shared a common ancestor around 7 million years ago, and they began to diverge before many other well-known species, such as brown bears and polar bears.
In terms of habitat, the three species of electric eels occupy different environments. Electrophorus electricus, or Linnaeus's electric eel, is found in the highland rivers of northern Amazonia, where the water is fast-flowing, well-oxygenated, and clear. Electrophorus voltai, or Volta's electric eel, inhabits similar highland environments in the Brazilian Shield, but further south. On the other hand, Electrophorus varii, named after the late Smithsonian ichthyologist Richard Vari, is typically found in the lowland floodplains of South America, where the waters are murky, muddy, and oxygen-deprived.
The three species of electric eels also vary in their electric power and capabilities. While Electrophorus electricus has long been known for its strong electric discharges, one of the newly identified species, Electrophorus voltai, is capable of generating an even stronger electrical discharge, reaching up to 860 volts. This makes it the strongest living bioelectricity generator known to date.
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The discovery highlights the importance of protecting the Amazon rainforest
Electric eels, despite their name, are not true eels but are members of the electroreceptive knifefish order Gymnotiformes. They are native to the neotropical freshwater rivers of South America, spanning Brazil, the Guianas, Suriname, Venezuela, Colombia, Ecuador, and Peru. They are found in the quiet, slow-moving waters of oxbow lakes, streams, pools, and flooded forests of the Amazon and Orinoco rivers.
For over two centuries, electric eels were believed to belong to a single species, Electrophorus electricus, first described by Linnaeus in 1766. However, in 2019, researchers at the Smithsonian's National Museum of Natural History made a groundbreaking discovery: electric eels in the Amazon basin belong to three distinct species that evolved from a shared ancestor about 7 million years ago. This finding highlights the incredible biodiversity of the Amazon rainforest and underscores the critical importance of its protection and conservation.
The three species of electric eels are Electrophorus electricus (Linnaeus's electric eel), Electrophorus voltai (Volta's electric eel), and Electrophorus varii (Vari's electric eel). These species differ not only in their genetics but also in their physical characteristics, habitats, and electric power. For example, Vari's eel inhabits the lowland floodplains with murky and oxygen-deprived waters, while Linnaeus's and Volta's eels are found in highland rivers with fast-flowing, well-oxygenated, clear waters.
The discovery of these new species in the Amazon rainforest is significant as it showcases the region's rich biodiversity and the potential for further undiscovered species. The Amazon rainforest is one of the most biodiverse regions on Earth, and its protection is crucial for preserving the vast array of plant and animal life that call it home. By conserving the Amazon rainforest, we not only safeguard the habitats of species like the electric eel but also ensure the sustainability of the entire ecosystem and the ecological services it provides.
Furthermore, the unique characteristics of the three electric eel species provide valuable insights into the evolution of electrogenesis. By studying their genomes, scientists can explore the potential for different enzymes and compounds that could have important medical and technological applications. Thus, the discovery of these species not only highlights the biodiversity of the Amazon but also emphasizes the potential for scientific advancements and innovations that can benefit humanity.
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Frequently asked questions
There are three species of electric eel.
The three species of electric eel are Electrophorus electricus, Electrophorus voltai, and Electrophorus varii.
The three species of electric eel were discovered in 2019 by C. David de Santana and colleagues.
The three species of electric eel differ in their genetics, habitat, and electric power.
