南美某偏远地区发现一种新的电鱼

A previously¹ unknown genus of electric fish has been identified in a remote region of South America by team of international researchers including University of Toronto Scarborough professor Nathan Lovejoy. The Akawaio penak, a thin, eel-like electric fish, was discovered in the shallow, murky² waters（浑水） of the upper Mazaruni River is northern Guyana.   Lovejoy's team at UTSC analyzed³ tissue samples collected during a recent expedition by researchers led by Hernán López-Fernández at the Royal Ontario Museum. By sequencing its DNA⁴ and reconstructing an evolutionary⁵ tree, Lovejoy's team discovered the fish is so distinct it represents a new genus, the taxonomic（分类的） classification level above species.   The upper Mazaruni River is a hotspot for biological diversity, yet remains⁶ largely unexplored because of its remote location. The area contains countless⁷ rivers on top of a series of uplands that have remained isolated⁸ from the rest of South America for more than 30 million years.   "The fact this area is so remote and has been isolated for such a long time means you are quite likely to find new species," says Lovejoy.   Like other electric knifefish, Akawaio penak has a long organ running along the base of the body that produces an electric field. The electric field is too weak to stun⁹ prey¹⁰ but is instead used to navigate¹¹, detect objects and to communicate with other electric fish. This trait is advantageous¹² given the murky habitats of the fish.   The species is named in honour of the Akawaio Amerindians that populate the upper Mazaruni. The region is increasingly suffering from freshwater habitat degradation¹³ as a consequence of gold-mining in the area.   "The Mazaruni contains many unique species that aren't found anywhere else in the world. It's an extremely important area in South America in terms of biodiversity," says Lovejoy.   The results of the discovery are published in the recent edition of the journal Zoologica Scripta.

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