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Snag (ecology)

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430:, are collected for the production of different objects, from furniture to entire log houses. Commercial enterprises market them abroad as "dead wood" or in Finland as "kelo wood". They have been especially prized for their silver-grey weathered surface in the manufacture of vernacular or national romantic products. The suppliers of "dead wood" emphasise its age: the wood has developed with dehydration in the dry coldness of the subarctic zones, the tree having stopped growing after some 300–400 years, and the tree has remained upright for another few hundred years. "Dead wood" logs are easier to transport and handle than normal logs due to their lightness. 1897: 274: 1925: 226: 434: 346: 1965: 1883: 1975: 32: 1953: 1911: 1869: 910: 1939: 242: 238:
birds and mammals are insectivorous and represent a major portion of the insectivorous forest fauna, and are important factors in controlling forest insect populations. There are many instances in which birds reduced outbreak populations of forest insects, such as woodpeckers affecting outbreaks of southern hardwood borers and Engelmann spruce beetles.
129: 389:, partially submerged snags posed hazards to early riverboat navigation and commerce. If hit, snags punctured the wooden hulls used in the 19th century and early 20th century. Snags were, in fact, the most commonly encountered hazard, especially in the early years of steamboat travel. In the United States, the 413:
in the rivers of Alabama to pull out and clear snags. Starting in 1824, there were successful efforts to remove snags from the Mississippi and its tributaries. By 1835, a lieutenant reported to the Chief of Engineers that steamboat travel had become much safer, but by the mid-1840s the appropriations
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Snags are optimal habitat for primary cavity nesters such as woodpeckers which create the majority of cavities used by secondary cavity users in forest ecosystems. Woodpeckers excavate cavities for more than 80 other species and the health of their populations relies on snags. Most snag-dependent
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Snag creation occurs naturally as trees die due to old age, disease, drought, or wildfire. A snag undergoes a series of changes from the time the tree dies until final collapse, and each stage in the decay process has particular value to certain wildlife species. Snag persistence depends on two
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Nilsson, Sven G; Niklasson, Mats; Hedin, Jonas; Aronsson, Gillis; Gutowski, Jerzy M; Linder, Per; Ljungberg, Håkan; Mikusiński, Grzegorz; Ranius, Thomas (2002). "Densities of large living and dead trees in old-growth temperate and boreal forests".
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growth supporting aquatic invertebrates in lowland rivers flowing through alluvial flood plains. Snags are important as sites for biofilm growth and for shelter and feeding of aquatic invertebrates in both lowland and upland rivers and streams.
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processes and follow a pathway that is influenced by biological legacies (e.g., large live trees and snags downed logs, seed banks, resprout tissue, fungi, and other live and dead biomass) that were not removed during the initial disturbance.
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Thomas, Jack W., Ralph G. Anderson, Chris Maser, and Evelyn L. Bull. 1979. Snags. p.60-77. In Wildlife habitats in managed forests the Blue Mountains of Oregon and Washington, USDA Forest Service. Ag. Hand. No. 553,
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MacNally, Ralph; Parkinson, Amber; Horrocks, Gregory; Young, Matthew (2002). "Current Loads of Coarse Woody Debris on Southeastern Australian Floodplains: Evaluation of Change and Implications for Restoration".
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Delaney, Matt; Brown, Sandra; Lugo, Ariel E.; Torres-Lezama, Armando; Quintero, Narsizo Bello (1998-03-01). "The Quantity and Turnover of Dead Wood in Permanent Forest Plots in Six Life Zones of Venezuela1".
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require for shelter and breeding. The damage such wholesale snag removal has caused is enormous but difficult to quantify, however some quantification attempts have been made. Most snags in these systems are
285:, are ecosystems that occupy potentially forested sites after a stand-replacement disturbance and before re-establishment of a closed-forest canopy. They are generated by natural disturbances such as 1512: 222:, along with the structural complexity of cavities, hollows, and broken tops make snags important habitat for birds, bats, and small mammals, which in turn feed larger mammalian predators. 377:
snags. As the dense wood of river red gum is almost impervious to rot it is thought that some of the river red gum snags removed in past decades may have been several thousand years old.
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Snags are an important structural component in forest communities, making up 10–20% of all trees present in old-growth tropical, temperate, and boreal forests. Snags and downed
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Franklin, Jerry F.; Lindenmayer, David; MacMahon, James A.; McKee, Arthur; Magnuson, John; Perry, David A.; Waide, Robert; Foster, David (2000-01-01). "Threads of Continuity".
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Swanson, Mark E; Franklin, Jerry F; Beschta, Robert L; Crisafulli, Charles M; DellaSala, Dominick A; Hutto, Richard L; Lindenmayer, David B; Swanson, Frederick J (2011-03-01).
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In temperate forests, snags provide critical habitat for more than 100 species of bird and mammal, and snags are often called 'wildlife trees' by foresters. Dead,
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of Patagonia, can remain intact for 100 years or more, becoming progressively shorter with age, while other snags with rapidly decaying wood, such as
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and the United States, the term snag is used to refer to the trees, branches and other pieces of naturally occurring wood found in a sunken form in
390: 984: 942: 1216: 1196: 115: 1873: 364:, the role of freshwater snags has been largely ignored until recently, and more than one million snags have been removed from the 273: 250:
factors, the size of the stem, and the durability of the wood of the species concerned. The snags of some large conifers, such as
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Keen, F. P. 1955. The rate of natural falling of beetle-killed ponderosa pine snags. Journal of Forestry 53(10):720–723.
1171: 977: 368:. Large tracts of the lowland reaches of the Murray-Darling system are now devoid of the snags that native fish like 75: 1685: 1327: 1278: 963: 452: 282: 42: 1648: 1468: 1337: 998: 798:
Donato, Daniel C.; Fontaine, Joseph B.; Robinson, W. Douglas; Kauffman, J. Boone; Law, Beverly E. (2009-01-01).
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Raphael, Martin G.; White, Marshall (1984-01-01). "Use of Snags by Cavity-Nesting Birds in the Sierra Nevada".
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it refers to trees, branches, and other pieces of naturally occurring wood found sunken in
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can be found near water, perched in a snag tree, or feeding upon their fish catch.
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and streams. Such snags have been identified as being critical for shelter and as
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In Scandinavia and Finland, snags, invariably pine trees, known in Finnish as
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for snag removal dried up and snags re-accumulated until after the Civil War.
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Successional stages of a snag from death of a tree to final decomposition.
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represent a large portion of the woody biomass in a healthy forest.
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When used in manufacturing, especially in 943: 929: 921: 881: 879: 877: 739: 611: 593: 179:, they are often called dead wood and in 116:Learn how and when to remove this message 712:Frontiers in Ecology and the Environment 479: 270:, break up and collapse in 2–10 years. 132:A fir tree snag among living fir trees 277:Stage 5 snags, Wallowa County, Oregon 233:snag provides nest cavities for birds 7: 682: 680: 678: 563: 561: 516: 514: 485: 483: 54:adding citations to reliable sources 1868: 147:refers to a standing dead or dying 777:10.1111/j.1526-4629.2000.tb00155.x 544:10.1111/j.1744-7429.1998.tb00364.x 14: 1217:Global Forest Information Service 1973: 1964: 1963: 1951: 1937: 1923: 1909: 1895: 1881: 1867: 908: 888:Steamboats on the Western Rivers 860:10.1046/j.1526-100X.2002.01043.x 816:10.1111/j.1365-2745.2008.01456.x 659:"Region 6 – Resource Management" 30: 1974: 41:needs additional citations for 1: 505:10.1016/S0378-1127(01)00480-7 493:Forest Ecology and Management 301:Water hunting birds like the 595:10.1371/journal.pone.0116745 407:of Washington State and the 391:U.S. Army Corps of Engineers 218:. These organisms and their 283:complex early seral forests 2036: 1328:Growth and yield modelling 453:Complex early seral forest 18: 1902:Earth sciences portal 1888:Climate change portal 1863: 1469:Great Green Wall (Africa) 958: 886:Hunter, Lewis C. (1977). 353:feeds near a snag in the 1474:Great Green Wall (China) 1047:Close to nature forestry 765:Conservation in Practice 1508:Million Tree Initiative 1930:Environment portal 1362:Sustainable management 1257:Trillion Tree Campaign 438: 357: 278: 246: 234: 163:; it is also known as 133: 1855:Wood process engineer 1559:Urban forest inequity 436: 348: 295:ecological succession 276: 244: 228: 131: 21:Snag (disambiguation) 1518:Shifting cultivation 1459:Forest fragmentation 1429:Carbon sequestration 1299:Woodland Carbon Code 1264:Forest certification 1172:Even-aged management 1087:Sustainable forestry 917:at Wikimedia Commons 366:Murray-Darling basin 50:improve this article 19:For other uses, see 2000:Ecology terminology 1323:Formally designated 1167:Ecological thinning 1077:Plantation forestry 985:Research institutes 894:. pp. 193–272. 852:2002ResEc..10..627M 840:Restoration Ecology 724:2011FrEE....9..117S 637:Wildlife Monographs 586:2015PLoSO..1016745V 536:1998Biotr..30....2D 448:Coarse woody debris 193:coarse woody debris 165:coarse woody debris 65:"Snag" ecology 1916:Ecology portal 1449:Forest degradation 1444:Ecosystem services 1052:Community forestry 892:Dover Publications 804:Journal of Ecology 463:Stream restoration 458:Large woody debris 439: 426:and in Swedish as 418:Dead wood products 358: 319:freshwater ecology 279: 247: 235: 153:freshwater ecology 134: 1987: 1986: 1944:Plants portal 1730:green woodworking 913:Media related to 281:Snag forests, or 231:coast Douglas-fir 126: 125: 118: 100: 2027: 1977: 1976: 1967: 1966: 1958:Trees portal 1956: 1955: 1942: 1941: 1928: 1927: 1914: 1913: 1912: 1900: 1899: 1898: 1886: 1885: 1884: 1871: 1870: 1592:Forest gardening 1549:Timber recycling 1496:Invasive species 1384:Tree measurement 945: 938: 931: 922: 912: 896: 895: 883: 872: 871: 834: 828: 827: 795: 789: 788: 760: 754: 753: 743: 703: 697: 694: 688: 684: 673: 672: 670: 669: 655: 649: 648: 632: 626: 625: 615: 597: 565: 556: 555: 518: 509: 508: 499:(1–3): 189–204. 487: 313:Freshwater snags 291:insect outbreaks 173:river navigation 167:. 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T. Preston 396: 392: 388: 380: 378: 376: 375:river red gum 371: 367: 363: 356: 352: 347: 343: 340: 336: 332: 328: 324: 320: 312: 310: 308: 304: 299: 296: 292: 288: 284: 275: 271: 269: 265: 261: 257: 256:Coast Redwood 253: 252:Giant Sequoia 243: 239: 232: 227: 223: 221: 217: 216:invertebrates 213: 209: 205: 201: 200:decaying wood 196: 194: 186: 184: 183:, kelo wood. 182: 178: 174: 170: 166: 162: 158: 154: 150: 146: 142: 139: 130: 120: 117: 109: 98: 95: 91: 88: 84: 81: 77: 74: 70: 67: –  66: 62: 61:Find sources: 55: 51: 45: 44: 39:This article 37: 33: 28: 27: 22: 1949: 1935: 1921: 1907: 1893: 1879: 1872: 1850:Tree planter 1830:Resin tapper 1810:Truck driver 1805:River driver 1554:Tree hugging 1539: 1522: 1489:timber mafia 1479:High grading 1464:Ghost forest 1434:Clearcutting 1357:Silviculture 1333:Horticulture 1177:Fire ecology 1092:Urban forest 1067:Mycoforestry 1027: 1023:Agroforestry 1004: 997: 990: 983: 976: 971:Forest areas 969: 962: 890:. 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Retrieved 662: 653: 639:(86): 3–66. 636: 630: 577: 573: 527: 523: 496: 492: 427: 423: 421: 408: 398: 386: 384: 359: 351:Canada goose 316: 300: 280: 248: 236: 214:, and other 197: 190: 187:Forest snags 144: 135: 112: 106:October 2016 103: 93: 86: 79: 72: 60: 48:Please help 43:verification 40: 1874:WikiProject 1798:smokejumper 1778:Firefighter 1741:Occupations 1725:Woodworking 1306:Forestation 1237:restoration 1192:informatics 1057:Ecoforestry 771:(1): 8–17. 530:(1): 2–11. 468:Tree hollow 405:Puget Sound 307:kingfishers 293:that reset 177:Scandinavia 1994:Categories 1820:Lumberjack 1815:Log scaler 1698:engineered 1649:non-timber 1622:sawmilling 1574:Industries 1541:svedjebruk 1252:transition 1232:protection 1222:old-growth 1207:governance 1162:Dendrology 1112:management 978:Ministries 741:1885/60278 668:2016-10-22 524:Biotropica 474:References 410:Montgomery 393:operated " 370:Murray cod 333:sites for 76:newspapers 2020:Limnology 2005:Dead wood 1768:Ecologist 1681:Tree farm 1582:Coppicing 1524:chitemene 1424:Acid rain 1372:allometry 1294:SmartWood 1242:secondary 1227:pathology 1202:inventory 1140:driftwood 1006:Arbor Day 868:1526-100X 824:1365-2745 785:1552-5228 750:1540-9309 604:1932-6203 552:1744-7429 395:snagboats 387:deadheads 362:Australia 323:Australia 220:consumers 16:Dead tree 1969:Category 1783:handcrew 1753:Arborist 1748:Forester 1708:mahogany 1654:palm oil 1644:charcoal 1629:Products 1564:Wildfire 1377:breeding 1338:GM trees 1187:dynamics 999:Journals 992:Colleges 952:Forestry 622:25615612 574:PLOS ONE 442:See also 331:spawning 287:wildfire 204:bacteria 2015:Habitat 1979:Outline 1793:lookout 1788:hotshot 1669:tanbark 1639:biomass 1634:biochar 1612:plywood 1597:Logging 1501:wilding 1150:log jam 1107:Ecology 848:Bibcode 720:Bibcode 645:3830575 613:4304802 582:Bibcode 532:Bibcode 428:torraka 403:in the 339:biofilm 212:insects 181:Finland 169:habitat 161:streams 141:ecology 90:scholar 1825:Ranger 1773:Feller 1758:Bucker 1664:rubber 1607:lumber 1417:topics 1404:volume 1399:height 1345:i-Tree 1182:Forest 1135:coarse 1130:Debris 1029:dehesa 866:  822:  783:  748:  643:  620:  610:  602:  550:  327:rivers 303:osprey 260:Alerce 157:rivers 138:forest 92:  85:  78:  71:  63:  1659:rayon 1394:girth 1389:crown 1350:urban 1247:stand 1155:slash 1145:large 1016:Types 964:Index 687:512p. 641:JSTOR 268:birch 264:aspen 208:fungi 97:JSTOR 83:books 1718:teak 1703:fuel 1693:Wood 1513:REDD 1367:Tree 1284:PEFC 1269:ATFS 915:Snag 864:ISSN 820:ISSN 781:ISSN 746:ISSN 618:PMID 600:ISSN 548:ISSN 424:kelo 335:fish 266:and 254:and 206:and 159:and 149:tree 145:snag 143:, a 69:news 1289:SFI 1279:FSC 1274:CFS 1212:law 1197:IPM 1109:and 856:doi 812:doi 773:doi 736:hdl 728:doi 608:PMC 590:doi 540:doi 501:doi 497:161 360:In 321:in 317:In 305:or 289:or 136:In 52:by 1996:: 876:^ 862:. 854:. 844:10 842:. 818:. 808:97 806:. 802:. 779:. 767:. 744:. 734:. 726:. 714:. 710:. 677:^ 661:. 616:. 606:. 598:. 588:. 578:10 576:. 572:. 560:^ 546:. 538:. 528:30 526:. 513:^ 495:. 482:^ 349:A 229:A 210:, 944:e 937:t 930:v 870:. 858:: 850:: 826:. 814:: 787:. 775:: 769:1 752:. 738:: 730:: 722:: 716:9 671:. 647:. 624:. 592:: 584:: 554:. 542:: 534:: 507:. 503:: 119:) 113:( 108:) 104:( 94:· 87:· 80:· 73:· 46:. 23:.

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