Knowledge (XXG)

California newt

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are the most common, and some species have developed a genetic resistance to tetrodotoxin. The mutations in the snake's genes that conferred resistance to the toxin have resulted in a selective pressure that favors newts that produce more potent levels of toxin. Increases in newt toxicity then apply
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The vocalizations of California newts are functional and are usually related to defense and sexual behaviors. They have three primary vocalizations: clicks, squeaks, and whistles. Clicks are most frequently produced, usually occurring in response to unfamiliar environments or confrontations. Squeaks
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Taricha torosa has also been known to utilize the "unken reflex" in response to threats from predators. In this posture the California Newt stretches out flexes the dorsal side of their body shooting their head and tail into the air, and exposing their brightly colored underbelly. This variation of
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Adult newts typically leave the pools shortly after breeding has concluded, however, some adults may remain in the pools for an additional few months to feed. Larvae hatch sometime in early to midsummer, depending on local water temperature. Larvae are difficult to find in streams, as they blend in
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The egg mass released by the female contains between seven and 30 eggs, and is roughly the consistency of a thick gelatin dessert. Typically, the egg masses are attached to stream plant roots or to rocky crevices in small pools of slow-moving water, but they have also been known to be attached to
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and they are often indistinguishable without dissection, but in general, the California newt has orange skin around the bottom of its eye while the Rough-skinned has gray skin at the bottom of its eye. The California newt also has eyes that protrude beyond the edge of the jaw line when viewed from
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are an incredibly aggressive, prolific, and stalwart species that will prey upon newt larvae and egg masses. The crayfish will also disrupt newt breeding via competition for space during the summer mating season and physically antagonizing adults. Crayfish will typically maul the adult newts with
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is also similar but has dark irises vs. yellow in the California newt, more red coloration underneath, and a dark band across the vent that is lacking in the California newt..Newts are amphibians. They are related to salamanders (in a subfamily called Pleurodelinae). They live in North America,
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eggs. In an aquarium habitat, earthworms provide the newt with all necessary nutrients. Other natural prey items would benefit the captive newt. Pellets tend to be inappropriate for terrestrial caudates, and fish food should be avoided completely.
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and harlequin frogs. Researchers believe bacteria synthesize tetrodotoxin, and the animals that employ the neurotoxin acquire it through consumption of these bacteria. This neurotoxin is strong enough to kill most vertebrates, including humans.
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Reproduction occurs generally between December and early May. Typically, the adult newts will return to the pool in which they hatched. After a mating dance, the male mounts the female and rubs his chin on her nose. He then attaches a
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are associated with defense behavior and may serve to startle predators, potentially reinforcing the recognition of the species as toxic. Whistles appear to be related to sex recognition or hierarchical interactions.
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Newts are mistakenly believed not to vocalize. Their vocalizations exhibit a wide frequency range from 1.4 kHz to 8 kHz, with varying duration times ranging from less than 0.1 second to 0.4 seconds.
529:, and other invertebrates are among the California newt's prey. Adult newts have also been known to cannibalize their own eggs and larvae. In the Sierra Nevada, the newt will also consume 1648: 557:-CSC). Some populations have been greatly reduced in southern California coastal streams due to the introduction of non-native, invasive species and human habitation. The mosquitofish ( 1663: 1673: 1653: 809:
Elliott, Sean A.; Kats, Lee B.; Breeding, Jennifer A. (12 January 1993). "The Use of Conspecific Chemical Cues for Cannibal Avoidance in California Newts (Taricha torosa)".
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was divided into two subspecies until 2007, when it was determined that the Sierra and coastal populations represent distinct evolutionary lineages. The former subspecies
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The California newt has warty, slate-gray skin on its back and bright orange-yellow skin underneath. It is very similar in appearance to the
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the unken reflex seems to be species-specific and differs from Taricha granulosa due to the tail remaining straight instead of curling.
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The size of maternal eggs influence the sizes of larvae. The larvae from larger eggs will not only experience shorter time period on
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and occupy a diverse array of habitats found near the small ponds and creeks where they breed, including woodlands and chaparral.
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underwater rocks or leaf debris. While shallow in a wide sense, these pools are rather deep relative to the average depth of a
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has resulted in the newts producing levels of toxin far in excess of what is needed to kill any other conceivable predator.
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Shawn R. Kuchta (2007). "Contact zones and species limits: hybridization between lineages of the California Newt,
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above (while the eyes of the rough-skinned do not protrude), giving its head a more bullet-like appearance. The
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Seth C. Gamradt; Lee B. Kats (1996). "Effect of Introduced Crayfish and Mosquitofish on California Newts".
1361: 479: 1577: 303:. Its adult length can range from 5 to 8 in (13 to 20 cm). Its skin produces the potent toxin 300: 180: 1324: 1174:
Riemer, W.J. (1958). ""Variation and systematic relationships within the salamander genus Taricha."".
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that are present in streams with introduced crayfish often sport tails with several notches removed.
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Database entry includes a range map and justification for why this species is of least concern
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a selective pressure favoring snakes with mutations conferring even greater resistance. This
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Europe and Asia. Their skin tends to be rougher than the skin of salamanders.
351: 296: 137: 17: 911: 869: 830: 765: 959: 127: 97: 1129: 1078: 1060: 1029: 978: 1556: 553:, the California newt, is currently a California Special Concern species ( 1378: 757: 573: 522: 514: 117: 789:"Idiopathic Ocular Heterochromia in the California Newt, Taricha torosa" 1465: 1413: 1160: 919: 895: 877: 462: 446: 292: 157: 1043:
Feldman, C. R.; Brodie, E. D.; Brodie, E. D.; Pfrender, M. E. (2010).
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Feldman, C. R.; Brodie, E. D.; Brodie, E. D.; Pfrender, M. E. (2009).
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has been retired and now all coastal populations are simply known as
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Charles T Hanifin; Edmund D Brodie Jr.; Edmund D Brodie III (2008).
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Due to their toxicity, California newts have few natural predators.
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Amphibian Species of the World. American Museum of Natural History
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stream, varying in depth from about 1–2 metres (3.3–6.6 ft).
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well with the sandy bottom, to which they usually stay close.
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Brodie, E.D. (1977). ""Salamander antipredator postures."".
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California newt in a Southern Californian riparian habitat.
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to the substrate, which she will retrieve into her cloaca.
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was elevated to full species level and it is now known as
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10.1655/0018-0831(2007)63[332:CZASLH]2.0.CO;2
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their claws, and subsequent infection can lead to death.
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Proceedings of the Royal Society B: Biological Sciences
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Introduced as fish bait and stock pond prey, red swamp
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Marchetti, Michael P.; Hayes, Abigail (20 June 2020).
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Alvarez, Jeff A.; Solano, Lupita; Wilcox, Jeffery T.
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than larvae from smaller eggs, but also grow larger.
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Mister-toad.com: mating behavior of California newts
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(10 December 1985). 1629:IUCN Red List near threatened species 1211: 1209: 889: 887: 7: 1659:Fauna of the San Francisco Bay Area 1253:IUCN Red List of Threatened Species 1230:10.1046/j.1523-1739.1996.10041155.x 609:IUCN Red List of Threatened Species 450:members, the glands in the skin of 1194:"Taricha torosa (California Newt)" 823:10.1111/j.1439-0310.1993.tb00469.x 680:, in the southern Sierra Nevada". 659:"California Newt - Taricha torosa" 465:. This is the same toxin found in 25: 746:Western North American Naturalist 1283:San Diego Natural History Museum 84: 1639:Amphibians of the United States 1: 1689:Amphibians described in 1833 1111:10.1371/journal.pbio.0060060 992:Hanifin, Charles T. (2010). 493:California Newt Unken Reflex 1684:Taxa named by Martin Rathke 1644:Endemic fauna of California 1242:Geoffrey Hammerson (2008). 1705: 563:) and red swamp crayfish ( 645:"SDNHM - California Newt" 225: 218: 209: 186: 179: 81:Scientific classification 79: 57: 48: 39: 34: 342:, the California newt. 259:Baird & Girard, 1853 960:10.1073/pnas.0901224106 249:Pleurodeles californiae 238:Wiegmann in Erman, 1835 1061:10.1098/rspb.2010.0748 616:: e.T59471A118999074. 547: 494: 480:evolutionary arms race 440:Toxicity and predation 429: 416: 320:Taricha torosa sierrae 1578:Paleobiology Database 1319:California newt facts 1304:CaliforniaHerps.com: 1260:: e.T59471A11946313. 796:Sonoran Herpetologist 545: 492: 427: 414: 334:Taricha torosa torosa 301:Western United States 1344:1 April 2010 at the 1313:29 July 2012 at the 1218:Conservation Biology 1199:Animal Diversity Web 758:10.3398/064.080.0204 415:California Newt Eggs 354:and in the southern 27:Species of amphibian 1055:(1698): 3317–3325. 951:2009PNAS..10613415F 945:(32): 13415–13420. 720:www.sciencebase.gov 665:on 5 February 2012. 566:Procambarus clarkii 538:Conservation status 454:secrete the potent 395:Southern California 288:), is a species of 280:orange-bellied newt 242:Salamandra beecheyi 51:Conservation status 548: 495: 430: 417: 368:rough-skinned newt 1616: 1615: 1565:Open Tree of Life 1362:Taxon identifiers 1308:- California Newt 1011:10.3390/md8030577 444:Like other genus 346:Range and habitat 272: 271: 267: 263:Amblystoma rubrum 260: 253: 246: 239: 232: 74: 16:(Redirected from 1696: 1609: 1608: 1599: 1598: 1586: 1585: 1573: 1572: 1560: 1559: 1547: 1546: 1534: 1533: 1521: 1520: 1508: 1507: 1495: 1494: 1482: 1481: 1469: 1468: 1456: 1455: 1443: 1442: 1430: 1429: 1417: 1416: 1404: 1403: 1402: 1389: 1388: 1387: 1357: 1278: 1276: 1274: 1269: 1234: 1233: 1224:(4): 1155–1162. 1213: 1204: 1203: 1190: 1184: 1183: 1171: 1165: 1164: 1140: 1134: 1133: 1123: 1113: 1089: 1083: 1082: 1072: 1040: 1034: 1033: 1023: 1013: 989: 983: 982: 972: 962: 930: 924: 923: 891: 882: 881: 856:(4): 1028–1035. 841: 835: 834: 806: 800: 799: 793: 784: 778: 777: 737: 731: 730: 728: 726: 712: 706: 705: 673: 667: 666: 661:. 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Index

Taricha torosa

Conservation status
Near Threatened
IUCN 3.1
Scientific classification
Edit this classification
Eukaryota
Animalia
Chordata
Amphibia
Urodela
Salamandridae
Taricha
Binomial name
Rathke
Eschscholtz

Synonyms
newt
endemic
California
Western United States
tetrodotoxin
Sierra newt
California
Sierra Nevada
rough-skinned newt
red-bellied newt
spermatophore

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