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Latrodectus hesperus

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life span. However, this defensive behavior is very important to females, which are under heavy predation pressure. Black widow spiders spend much time on web construction at night, which is also an active time for ground mice. If the webs are low above ground, it is easy for mice and other predators to attack from below. Since the spider will stay largely stationary at the web hub, such attacks are mostly successful if there is no defensive behavior.
1723: 1735: 671:. The female is more of a threat than the male in this species, however her aggressive side only comes out when she is protecting her eggs. Not only are the females fangs larger than the males, but their venomous glands are also more distinct. The effects of their bite can range from a simple irritation to severe autonomic disparities. The venom is composed of 250:). In humans, symptoms of this venom include pain, nausea, goosebumps, and localized sweating. In historical literature, fatalities were reported at anywhere between 0.5% and 12%, but studies within the past several decades have been unable to confirm any fatalities from this or any of the other U.S. species of 646:
can eject a chunk of viscid silk toward potential predators. This silk is not toxic, but its mechanical irritation can thwart most predators. However, adult males are unable to produce this defensive silk, presumably because they need to conserve energy for reproduction during their relatively short
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The time spent on courting varies tremendously and can be as short as ten minutes or as long as two hours. Male's genital bulbs may get injured or partially destroyed in the act of copulation, which leaves him unable to mate again in the future. This may be the reason that many male mates are found
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to ensure a successful courtship with the female is to minimize the escape route options for the female within her own web. This is accomplished by the male severing the female's web at various locations that the male believes could provide the female with a course of action to avoid the male. Once
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produces cobwebs. Cobwebs differ from orb webs, and their architecture can be broken down into three sections. Two sections are utilized to capture prey, the gumfoot threads and the mesh region. The third section provides the structural support for the web and is known as the scaffold threads. The
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as he actively begins to explore the web. This exploration is intermixed with resting bouts. The male's body spasms, producing a high frequency vibration throughout his abdomen. In many instances, the female will not accept the male's sexual display and will scare the male away. In some instances,
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in terms of how dire a situation must become, or how hungry the spider must be, to resort to cannibalism. Specifically, within siblingships the range of time lapsed before the spider siblings fell victim to cannibalism varied from two days to three weeks. There appears to be a direct relationship
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frequently hangs upside down near center of the web and waits for any insects to enter the web to attack. It bites its victim then wraps it in silk. There are multiple aspects of this spider's web that serve the purpose of capturing prey. The web incorporates hanging gum-footed threads that have
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will last before falling back on sibling cannibalism and the amount of maternal investment put into their egg sac. In other words, the more investment a mother puts into her egg sac, the longer their offspring will go before engaging in sibling cannibalism as their source of prey and nutrition.
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reacts to changes in prey capture by altering its web-spinning behavior. When the spider reaches satiety, it will decrease its energy expenditure on building the features of the web specifically purposed for prey capture. This is evolutionarily advantageous for the spider because it is already
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silk contains sexual pheromones which are perceived by the opposite sex upon contact with the web. The males are able to locate the female and begin courting behavior in response to female pheromones. The female curtails her predatory reflexes against the male in response to male pheromones.
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is strongly adhesive. The silk has a fiber at the center covered by some droplets of liquid adhesive protein. When rubbing against one's fingers, it feels like the texture of rubber. The droplets are about twenty times larger than the center fiber's diameter and are visible to the naked eye.
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Female choosiness can be both evolutionarily advantageous and disadvantageous depending on whether the risk of delaying copulation will inevitably pay off with a better mate, or if it will instead cost the female her whole potential of producing offspring. In fact four percent of female
219:-shaped red mark on the lower abdomen. This "hourglass" mark can be yellow, and on rare occasions, white. The male of the species is around half this length and generally a tan color with lighter striping on the abdomen. The population was previously described as a subspecies of 362:". Scramble competition means that no male possesses a monopoly over the resource, which in this case is the female spider, yet because there is a finite amount of this resource, those who exploit it faster will come out on top. There are multiple ways in which the female 614:
gumfoot lines hang beneath the web, the liquid glue on these lines serves as a sticky substance to trap prey in. The line will break once prey catches on it, creating a tensile force within the web that pulls the line along with the prey up to the spider.
268:(Australia's redback), is rare in this species. Male western widows may breed several times during their relatively short lifespans. Males are known to show preference for mating with well-fed females over starved ones, taking cues from the females' webs. 662:
species because of their relatedness. The venom is exuded from the spiders' fangs and injected into the enemy. The spiders' prey is paralyzed by the venom, which enables their future digestion. For humans, the venom behaves like a
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the male has successfully made contact with the female's body, he swoons her by gently stroking various parts of her body. The male then creates what is known as the "bridal veil", which is simply silk thrown onto the female.
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has the potential to possess more than one mate during their lifespan. This is in part due to the male-bias within the sexually active population of the spider. This sex-bias allows the males to engage in what is known as
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satiated. Therefore, it would be a waste of energy to seek out more nutrients. Although there is a decrease in prey-capturing aspects of the web, the overall silk production remains steady or in some cases will increase.
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liquid glue on them. When prey come into contact with these threads, they get stuck to them, causing the thread to break and the prey to be propelled up by the web to an easy point of access for the spider. The web of
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Johnson, J. Chadwick; Trubl, Patricia Trubl; Blackmore, Valerie; Miles, Lindsay (2011). "Male black widows court well-fed females more than starved females: silken cues indicate sexual cannibalism risk".
683:. The venom causes an excess release of neurotransmitters which can cause a slew of symptoms. Some of these symptoms include muscle rigidity, perspiration, and nausea. Treatments include painkillers and 319:
produce sexually-specific scents that are combined with their silk; each sex responds by initiating mating when it comes in contact with a web of the opposite sex. On initiating courting, the male
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also allows for locomotive action by the spider when attacking prey through a sheet of silk. In the months of May through October, there is a significant increase in the amount of prey caught by
407:, presumably because these are the months in which the female produces her egg sacs, and in which the offspring are born and their survival is dependent on their mother's ability to feed them. 328:
the females will violently jerk their abdomen, similar to courting male displays, which ultimately leads to a positive reaction from the males and a more successful insemination.
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silk were found to be similar to the properties of silk from orb-weaving spiders. The ultimate strength for the three kinds of silk measured in the study was about 1000 
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were detected at all in these silks. In the inner egg case silk, although alanine remained an abundant amino acid, its abundance was less so in this silk than the others.
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produces three different types of silk: dragline silk, inner egg case silk, and scaffolding silk. Analysis of the amino acid composition of the various silks produced by
971: 1128:"Aspects of the Courtship Behavior of the Black Widow Spider, Latrodectus hesperus (Araneae: Theridiidae), with Evidence for the Existence of a Contact Sex Pheromone" 2030: 231:. The species, as with others of the genus, build irregular or "messy" webs: unlike the spiral webs or the tunnel-shaped webs of other spiders, the strands of a 1057: 426:
is more likely to build a home in an area that is expressing a high degree of chemical prey cues. This finding may grant us the ability of controlling
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can guarantee her right to choose, one of which is eating the male before copulation. The female receives chemical cues given off by other nearby
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dead in the female's web after copulation. Females will often consume these dead males for nutrients to improve her own reproductive success.
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also decrease silk investment into webs when preparing for offspring by alternatively increasing silk investment into egg sac production.
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may feed on conspecifics: when alternative prey options are scarce; when a spider is starving; in self-defense during antagonistic bouts.
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The black widow spiders face some predators, like mice, which are omnivorous and larger than the black widow. Juveniles and female adult
490:. The peak activity of hymenopterans in this study was May through September in British Columbia, paralleling a spike in consumption by 908:
spp. envenomation and treatment: a National Poison Data System review. Annals of Pharmacotherapy 45(12):1491-8. doi: 10.1345/aph.1Q424
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that indicate the population density, and therefore give them a notion as to whether their choosiness will pay off or fail to do so.
1561:"Quasistatic and continuous dynamic characterization of the mechanical properties of silk from the cobweb of the black widow spider 1170:"Black widows as plastic wallflowers: female choosiness increases with indicators of high mate availability in a natural population" 1881: 1032: 734: 1920: 1464:"Family Affects Sibling Cannibalism in the Black Widow Spider, Latrodectus hesperus: Sibling Cannibalism in Black Widow Spiders" 2035: 1739: 1656: 1246: 1925: 1708: 975: 746: 2040: 1409:"Chemical prey cues influence the urban microhabitat preferences of Western black widow spiders, Latrodectus hesperus" 2015: 291:. They are most commonly found near the Canada-US border, as well as less commonly throughout the grasslands of the 1951: 323:
will utilize his tarsi to tap the lines of the female's web. The male will continue this tapping gesture with his
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Male western black widow: This image shows the enlarged palpal organs (large dark disks) at the tip of the
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accounted for the majority of the spiders' prey; the majority of prey within Coleoptera were
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The female is stimulated upon contact of a male's web, and vice versa. Male and female
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bites from 2000 through 2008). The female's consumption of the male after courtship, a
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is able to detect chemical cues from their prey. As a by-product of this detection,
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Monte AA, Bucher-Bartelson B, Heard KJ (2011) A US perspective of symptomatic
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Johnson, J. Chadwick; Kitchen, Kathryn; Andrade, Maydianne C. B. (May 2010).
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show that both dragline silk and scaffolding silk are primarily composed of
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Scott, Catherine E.; McCann, Sean; Andrade, Maydianne C. B. (2020-06-02).
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is an "opportunistic cannibal". There are three circumstances under which
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seeks refuge in the location from which the web originates and emerges.
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Bettini, S. (1964). Epidemiology of latrodectism. Toxicon, 2(2), 93–102
867: 664: 592: 566: 459: 239: 1424: 920:"Sexual Selection for Male Sacrifice in the Australian Redback Spider" 559:(145,000 psi). The ultimate strength reported in a previous study for 1899: 1868: 1369: 684: 487: 451: 383: 216: 85: 65: 1750: 418:
follows prey cues when determining where to settle down. The female
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is an opportunistic cannibal. There of course is variation amongst
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Casem, Merri Lynn; Turner, Dianna; Houchin, Kelly (1999-03-01).
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to relocate to a location where there are more available prey.
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was 1290±160 MPa (188,000 psi). The ultimate strength of
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Williams, Mollie; Anderson, Jackie; Nappe, Thomas M. (2020),
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Johnson, Amanda; Revis, Orenda; Johnson, J. Chadwick (2011).
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Blackledge, Todd A.; Zevenbergen, Jacquelyn M. (2007-05-01).
483: 211:, is a venomous spider species found in western regions of 1711:" (On-line), Animal Diversity Web. Accessed March 8, 2009 1635:
Salyer, Steven W. (2007-01-01), Salyer, Steven W. (ed.),
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Female, front view, with moth and funnel web spider prey
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and the spider's eight eyes when the image is expanded.
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are polyphagous and feed on prey from eight different
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can be found in western regions of North America. In
1406: 238:Female black widows have potent venom containing a 1594:International Journal of Biological Macromolecules 1587: 1229:, in Jørgensen, Sven Erik; Fath, Brian D. (eds.), 1167: 225:and it is closely related to the northern species 1643:, Philadelphia: W.B. Saunders, pp. 183–260, 2002: 2031:Fauna of the California chaparral and woodlands 1685:, Treasure Island (FL): StatPearls Publishing, 254:(e.g. zero fatalities among 23,409 documented 1233:, Oxford: Academic Press, pp. 695–700, 1033:"Western Black Widow (Latrodectus hesperus)" 752:Female with typical red hourglass on abdomen 918:Andrade, Maydianne C. B. (5 January 1996). 31: 1201: 1125: 860: 430:infestations. By killing off the prey of 1224: 1126:Ross, Kenneth; Smith, Robert L. (1979). 377: 2026:Fauna of the Northwestern United States 2021:Fauna of the Southwestern United States 1637:"Chapter 6 - Environmental Emergencies" 1351: 1268:"How to Get Rid of Black Widow Spiders" 964: 917: 478:, and the most common Hymenoptera were 2003: 1634: 1558: 1511: 1507: 1505: 989: 507: 1755: 1754: 1583: 1581: 1512:Vetter, Richard S. (September 1980). 1503: 1501: 1499: 1497: 1495: 1493: 1491: 1489: 1487: 1485: 1347: 1345: 1343: 1341: 1339: 1291: 1289: 1287: 1163: 1161: 1121: 1119: 1117: 1115: 1050: 1025: 776:Male, ventral view (light coloration) 637: 569:is about 800 MPa (116,000 psi). 307: 1074: 800:Male, ventral view (dark coloration) 764:Male, dorsal view (light coloration) 343: 1518:Behavioral Ecology and Sociobiology 1075:Ross, Kenneth; et al. (1979). 788:Male, dorsal view (dark coloration) 605: 373: 331:One strategy performed by the male 235:web have no apparent organization. 13: 1578: 1482: 1336: 1284: 1158: 1112: 974:. Hastings Reserve. Archived from 687:if the toxicity is severe enough. 353:did not acquire mates. The female 262:and suicidal behavior observed in 14: 2052: 1715: 667:, affecting the neurotransmitter 658:bite is similar to that of other 551:and other physical properties of 529: 1988:urn:lsid:nmbe.ch:spidersp:007811 1733: 1721: 1649:10.1016/b978-141602971-7.10006-6 1476:10.1111/j.1439-0310.2010.01792.x 1239:10.1016/b978-008045405-4.00005-7 841: 829: 817: 805: 793: 781: 769: 757: 745: 733: 721: 709: 697: 52: 1670: 1628: 1552: 1455: 1400: 1260: 1218: 621: 446:Like other web-building spiders 1559:Blackledge, Todd; et al. 1068: 911: 898: 889: 848:Typical female from California 1: 2036:Natural history of California 1679:"Black Widow Spider Toxicity" 1606:10.1016/S0141-8130(98)00078-6 1314:10.1016/j.anbehav.2006.10.014 1011:10.1016/j.anbehav.2011.05.018 878:. Natural History Museum Bern 853: 521:between the length of time a 1641:Essential Emergency Medicine 872:Chamberlin & Ivie, 1935" 410: 7: 1567:. The Company of Biologists 1225:Łomnicki, A. (2008-01-01), 1062:National Convergency Canada 944:10.1126/science.271.5245.70 10: 2057: 1413:The Journal of Arachnology 1358:The Journal of Arachnology 1227:"Competition and Behavior" 1186:10.1038/s41598-020-65985-z 1132:The Journal of Arachnology 1088:The Journal of Arachnology 690: 390: 242:active against a range of 205:western black widow spider 2041:Spiders described in 1935 1763: 1352:Salomon, Maxence (2011). 512:As previously discussed, 302: 174: 167: 49:Scientific classification 47: 39: 30: 23: 2016:Spiders of North America 1037:The Royal Alberta Museum 650: 534: 454:orders. In one study in 271: 1231:Encyclopedia of Ecology 1064:. Government of Canada. 441: 387: 972:"Black Widow Spiders" 656:Latrodectus hesperus' 599:Latrodectus hesperus' 539:The silk produced by 494:during these months. 416:Latrodectus hesperus 381: 283:it can be found from 265:Latrodectus hasseltii 1809:Latrodectus_hesperus 1795:Latrodectus hesperus 1765:Latrodectus hesperus 1742:at Wikimedia Commons 1740:Latrodectus hesperus 1728:Latrodectus hesperus 1709:Latrodectus hesperus 1563:Latrodectus hesperus 1079:Latrodectus hesperus 876:World Spider Catalog 870:Latrodectus hesperus 836:Female, ventral view 627:Latrodectus hesperus 573:Latrodectus hesperus 562:Trichonephila edulis 498:Latrodectus hesperus 396:Latrodectus hesperus 360:scramble competition 277:Latrodectus hesperus 228:Latrodectus variolus 200:Latrodectus hesperus 178:Latrodectus hesperus 41:Latrodectus hesperus 25:Latrodectus hesperus 1746:Western black widow 936:1996Sci...271...70A 716:Female with egg sac 508:Sibling cannibalism 222:Latrodectus mactans 1530:10.1007/bf00299363 1174:Scientific Reports 638:Defensive behavior 587:, in fact neither 388: 308:Courtship behavior 1998: 1997: 1960:Open Tree of Life 1757:Taxon identifiers 1738:Media related to 1707:Minus, A. 2001. " 1658:978-1-4160-2971-7 1425:10.1636/Hi11-19.1 1248:978-0-08-045405-4 1058:"NCC Black Widow" 824:Female, side view 549:ultimate strength 344:Female choosiness 293:Canadian Prairies 196: 195: 16:Species of spider 2048: 1991: 1990: 1978: 1977: 1968: 1967: 1955: 1954: 1942: 1941: 1929: 1928: 1916: 1915: 1903: 1902: 1890: 1889: 1877: 1876: 1864: 1863: 1851: 1850: 1838: 1837: 1825: 1824: 1812: 1811: 1799: 1798: 1797: 1784: 1783: 1782: 1752: 1751: 1737: 1726:Data related to 1725: 1700: 1699: 1698: 1697: 1674: 1668: 1667: 1666: 1665: 1632: 1626: 1625: 1585: 1576: 1575: 1573: 1572: 1556: 1550: 1549: 1509: 1480: 1479: 1459: 1453: 1452: 1404: 1398: 1397: 1370:10.1636/P10-25.1 1349: 1334: 1333: 1302:Animal Behaviour 1293: 1282: 1281: 1279: 1278: 1264: 1258: 1257: 1256: 1255: 1222: 1216: 1215: 1205: 1165: 1156: 1155: 1123: 1110: 1109: 1107: 1106: 1085: 1072: 1066: 1065: 1054: 1048: 1047: 1045: 1043: 1029: 1023: 1022: 999:Animal Behaviour 993: 987: 986: 984: 983: 968: 962: 961: 959: 958: 915: 909: 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849: 846: 837: 834: 825: 822: 813: 810: 801: 798: 789: 786: 777: 774: 765: 762: 753: 750: 741: 740:Immature female 738: 729: 728:Immature female 726: 717: 714: 705: 702: 693: 653: 640: 624: 608: 537: 532: 510: 444: 413: 393: 376: 346: 310: 305: 274: 192: 182: 176: 163: 51: 17: 12: 11: 5: 2054: 2044: 2043: 2038: 2033: 2028: 2023: 2018: 2013: 1996: 1995: 1993: 1992: 1979: 1969: 1956: 1943: 1930: 1917: 1904: 1891: 1878: 1865: 1852: 1839: 1826: 1813: 1800: 1785: 1769: 1767: 1761: 1760: 1749: 1748: 1743: 1731: 1730:at Wikispecies 1717: 1716:External links 1714: 1713: 1712: 1702: 1701: 1669: 1657: 1627: 1600:(2): 103–108. 1577: 1551: 1524:(3): 187–193. 1481: 1454: 1419:(3): 449–453. 1399: 1364:(1): 154–160. 1335: 1308:(5): 855–864. 1283: 1259: 1247: 1217: 1157: 1111: 1067: 1049: 1024: 1005:(2): 383–390. 988: 963: 930:(5245): 70–2. 910: 897: 888: 858: 857: 855: 852: 851: 850: 847: 840: 838: 835: 828: 826: 823: 816: 814: 811: 804: 802: 799: 792: 790: 787: 780: 778: 775: 768: 766: 763: 756: 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Index


Scientific classification
Edit this classification
Eukaryota
Animalia
Arthropoda
Chelicerata
Arachnida
Araneae
Araneomorphae
Theridiidae
Latrodectus
Binomial name
Chamberlin
Ivie
North America
hourglass
Latrodectus mactans
Latrodectus variolus
neurotoxin
mammals
latrodectism
cannibalistic
Latrodectus hasseltii
Canada
British Columbia
Manitoba
Canadian Prairies
Western Canada
pedipalps

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