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Nerodia is a genus of nonvenomous colubrid snakes commonly referred to as water snakes due to their aquatic behavior. The genus includes nine species, all native to North America.
Nerodia species vary greatly, but all are relatively heavy-bodied snakes, sometimes growing to 1.2 m (4 feet) or longer in total length. They have flattened heads, with small eyes that have round pupils, and keeled dorsal scales. Species like N. fasciata display distinct banding, whereas other species, like N. erythrogaster, have blotching, and those like N. rhombifer have diamond-shaped patterning. Most species are brown or olive green, or some combination thereof with markings being brown, or black. Yellow or cream-colored accenting is common.
Water snakes, as their name implies, are largely aquatic. They spend the vast majority of their time in or very near permanent sources of water. Often, they can be found basking on tree branches that overhang slow-moving streams or ponds.
Their primary diet is fish and amphibians, and they are quite adept at catching both in their aquatic environment. They will also consume small reptiles and rodents that live near water.
While their initial instinct is to flee when disturbed, water snakes readily defend themselves if they are unable to escape. They do not often hesitate to strike or bite if handled, and often expel a foul-smelling musk from their cloacae.
Nerodia species are viviparous, breeding in the spring and giving birth in the late summer or early fall. They are capable of having 90 or more young, but broods generally are much smaller. Neonates are around 20–26 centimetres (8–10 in) in length.
These species and subspecies are recognized as valid:[1]
Nerodia species are widely spread throughout the southern and eastern half of the United States, north into Canada and south into Mexico, as well as to the island of Cuba. Many ranges overlap, and intergrading of subspecies is not unknown, but is rare. Two species of Nerodia are invasive in the southwest US.[2]
Due to how widespread and extremely common they are in the wild, water snakes are often found in the exotic pet trade, throughout the United States, though they are rarely captive bred. Their relative physical plainness, compared to other available pet snake species, and their propensity to bite make them less than attractive pets to most people. They are easy to care for, though, and do quite well in captivity.
Some species, such as N. harteri and N. paucimaculata are only found in very isolated localities and are protected by state laws, but the majority of Nerodia species hold no specific conservation status. Due to their habitat choice, defensive disposition, and vague similarity to the venomous cottonmouth (Agkistrodon piscivorus), they are frequently mistaken for them. This results in many more water snakes being killed every year than cottonmouths. Often, water snakes found in areas where the cottonmouth does not range are still killed by humans out of ignorance and fear.
Nerodia is a genus of nonvenomous colubrid snakes commonly referred to as water snakes due to their aquatic behavior. The genus includes nine species, all native to North America.
Nerodia es un género de serpientes de la familia Natricidae. Sus especies se distribuyen por Norteamérica y Cuba.
Se reconocen las siguientes:[1]
Nerodia es un género de serpientes de la familia Natricidae. Sus especies se distribuyen por Norteamérica y Cuba.
Perekonda Nerodia klassifitseeritakse roomajate andmebaasis järgmised maoliigid[1]:
Neid võib kohata Kanadas, Ameerika Ühendriikides, Mehhikos ja Kuuba põhjaosas.
Selles artiklis on kasutatud prantsuskeelset artiklit fr:Nerodia seisuga 07.02.2014.
Nerodia Natricidae familiako narrasti genero bat da. Ipar Amerika eta Kubako iparraldaen bizi dira.
Nerodia Natricidae familiako narrasti genero bat da. Ipar Amerika eta Kubako iparraldaen bizi dira.
Nerodia est un genre de serpents de la famille des Natricidae[1].
Les espèces de ce genre au Canada, aux États-Unis, au Mexique et dans le Nord de Cuba[1].
Selon Reptarium Reptile Database (10 septembre 2013)[2] :
Nerodia est un genre de serpents de la famille des Natricidae.
Nerodia adalah genus ular air yang tersebar luas di Amerika Serikat bagian timur, tenggara, dan selatan, serta Meksiko bagian timur laut. Populasi terbanyak terdapat di Sungai Mississippi, Sungai Appalachicola, Florida Everglades, dan hampir semua sungai dan rawa-rawa di sepanjang wilayah timur hingga selatan di Amerika Serikat.
Ular-ular ini mencapai panjang hingga 1,2 meter. Tubuh berwarna cokelat, abu-abu, atau hijau lumut. Semua jenis tinggal di sekitar perairan. Makanan mereka adalah ikan dan amfibi, terkadang juga memangsa binatang pengerat seperti tikus.
Nerodia adalah genus ular air yang tersebar luas di Amerika Serikat bagian timur, tenggara, dan selatan, serta Meksiko bagian timur laut. Populasi terbanyak terdapat di Sungai Mississippi, Sungai Appalachicola, Florida Everglades, dan hampir semua sungai dan rawa-rawa di sepanjang wilayah timur hingga selatan di Amerika Serikat.
Amerikanske vannsnoker er en slekt av slanger som er utbredt i USA, Mexico og Cuba.
De er ganske lange og kraftig bygd. Alle lever et liv knyttet til vann, og de eter hovedsakelig amfibier og fisk. Både livsførsel og kroppsbygning minner om artene i slekten Natrix, og de ble tidligere regnet til den slekten.
Amerikanske vannsnoker er en slekt av slanger som er utbredt i USA, Mexico og Cuba.
De er ganske lange og kraftig bygd. Alle lever et liv knyttet til vann, og de eter hovedsakelig amfibier og fisk. Både livsførsel og kroppsbygning minner om artene i slekten Natrix, og de ble tidligere regnet til den slekten.
Nerodia[1] este un gen de șerpi din familia Colubridae.[1]
Cladograma conform Catalogue of Life[1]:
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Acest articol referitor la o reptilă este un ciot. Puteți ajuta Wikipedia prin completarea sa. Nerodia, po slovensky užovka, je rod z čeľade užovkovité.
Väčšinou žijú vo alebo tesne pri vode. Živia sa rybami, obojživelníkmi a hlodavcami. Ich výzor sa pomerne líši, sú to ale pomerne mohutné hady, väčšinou sú primárne hnedé alebo olivovo zelené.
Nerodia, po slovensky užovka, je rod z čeľade užovkovité.
Väčšinou žijú vo alebo tesne pri vode. Živia sa rybami, obojživelníkmi a hlodavcami. Ich výzor sa pomerne líši, sú to ale pomerne mohutné hady, väčšinou sú primárne hnedé alebo olivovo zelené.
Commons ponúka multimediálne súbory na tému 
Wikidruhy ponúkajú informácie na tému 