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Snag (ecology)

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441:, 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. 1908: 285: 1936: 237: 445: 357: 1976: 1894: 1986: 43: 1964: 1922: 1880: 921: 1950: 253: 249:
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.
140: 400:, 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 424:
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
296:, 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 1523: 233:, 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. 388:
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
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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.
1182: 988: 379:. Large tracts of the lowland reaches of the Murray-Darling system are now devoid of the snags that native fish like 86: 1696: 1338: 1289: 974: 463: 293: 53: 1659: 1479: 1348: 1009: 809:
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 954: 940: 932: 892: 890: 888: 750: 622: 604: 190:, they are often called dead wood and in 127:Learn how and when to remove this message 723:Frontiers in Ecology and the Environment 490: 281:, break up and collapse in 2–10 years. 143:A fir tree snag among living fir trees 288:Stage 5 snags, Wallowa County, Oregon 244:snag provides nest cavities for birds 7: 693: 691: 689: 574: 572: 527: 525: 496: 494: 65:adding citations to reliable sources 1879: 158:refers to a standing dead or dying 788:10.1111/j.1526-4629.2000.tb00155.x 555:10.1111/j.1744-7429.1998.tb00364.x 25: 1228:Global Forest Information Service 1984: 1975: 1974: 1962: 1948: 1934: 1920: 1906: 1892: 1878: 919: 899:Steamboats on the Western Rivers 871:10.1046/j.1526-100X.2002.01043.x 827:10.1111/j.1365-2745.2008.01456.x 670:"Region 6 – Resource Management" 41: 1985: 52:needs additional citations for 1: 516:10.1016/S0378-1127(01)00480-7 504:Forest Ecology and Management 312:Water hunting birds like the 606:10.1371/journal.pone.0116745 418:of Washington State and the 402:U.S. Army Corps of Engineers 229:. These organisms and their 294:complex early seral forests 2047: 1339:Growth and yield modelling 464:Complex early seral forest 29: 1913:Earth sciences portal 1899:Climate change portal 1874: 1480:Great Green Wall (Africa) 969: 897:Hunter, Lewis C. (1977). 364:feeds near a snag in the 1485:Great Green Wall (China) 1058:Close to nature forestry 776:Conservation in Practice 1519:Million Tree Initiative 1941:Environment portal 1373:Sustainable management 1268:Trillion Tree Campaign 449: 368: 289: 257: 245: 174:; it is also known as 144: 1866:Wood process engineer 1570:Urban forest inequity 447: 359: 306:ecological succession 287: 255: 239: 142: 32:Snag (disambiguation) 1529:Shifting cultivation 1470:Forest fragmentation 1440:Carbon sequestration 1310:Woodland Carbon Code 1275:Forest certification 1183:Even-aged management 1098:Sustainable forestry 928:at Wikimedia Commons 377:Murray-Darling basin 61:improve this article 30:For other uses, see 2011:Ecology terminology 1334:Formally designated 1178:Ecological thinning 1088:Plantation forestry 996:Research institutes 905:. pp. 193–272. 863:2002ResEc..10..627M 851:Restoration Ecology 735:2011FrEE....9..117S 648:Wildlife Monographs 597:2015PLoSO..1016745V 547:1998Biotr..30....2D 459:Coarse woody debris 204:coarse woody debris 176:coarse woody debris 76:"Snag" ecology 1927:Ecology portal 1460:Forest degradation 1455:Ecosystem services 1063:Community forestry 903:Dover Publications 815:Journal of Ecology 474:Stream restoration 469:Large woody debris 450: 437:and in Swedish as 429:Dead wood products 369: 330:freshwater ecology 290: 258: 246: 164:freshwater ecology 145: 1998: 1997: 1955:Plants portal 1741:green woodworking 924:Media related to 292:Snag forests, or 242:coast Douglas-fir 137: 136: 129: 111: 16:(Redirected from 2038: 1988: 1987: 1978: 1977: 1969:Trees portal 1967: 1966: 1953: 1952: 1939: 1938: 1925: 1924: 1923: 1911: 1910: 1909: 1897: 1896: 1895: 1882: 1881: 1603:Forest gardening 1560:Timber recycling 1507:Invasive species 1395:Tree measurement 956: 949: 942: 933: 923: 907: 906: 894: 883: 882: 845: 839: 838: 806: 800: 799: 771: 765: 764: 754: 714: 708: 705: 699: 695: 684: 683: 681: 680: 666: 660: 659: 643: 637: 636: 626: 608: 576: 567: 566: 529: 520: 519: 510:(1–3): 189–204. 498: 324:Freshwater snags 302:insect outbreaks 184:river navigation 178:. 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T. Preston 407: 403: 399: 391: 389: 387: 386:river red gum 382: 378: 374: 367: 363: 358: 354: 351: 347: 343: 339: 335: 331: 323: 321: 319: 315: 310: 307: 303: 299: 295: 286: 282: 280: 276: 272: 268: 267:Coast Redwood 264: 263:Giant Sequoia 254: 250: 243: 238: 234: 232: 228: 227:invertebrates 224: 220: 216: 212: 211:decaying wood 207: 205: 197: 195: 194:, kelo wood. 193: 189: 185: 181: 177: 173: 169: 165: 161: 157: 153: 150: 141: 131: 128: 120: 109: 106: 102: 99: 95: 92: 88: 85: 81: 78: –  77: 73: 72:Find sources: 66: 62: 56: 55: 50:This article 48: 44: 39: 38: 33: 19: 1960: 1946: 1932: 1918: 1904: 1890: 1883: 1861:Tree planter 1841:Resin tapper 1821:Truck driver 1816:River driver 1565:Tree hugging 1550: 1533: 1500:timber mafia 1490:High grading 1475:Ghost forest 1445:Clearcutting 1368:Silviculture 1344:Horticulture 1188:Fire ecology 1103:Urban forest 1078:Mycoforestry 1038: 1034:Agroforestry 1015: 1008: 1001: 994: 987: 982:Forest areas 980: 973: 901:. 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Retrieved 673: 664: 650:(86): 3–66. 647: 641: 588: 584: 538: 534: 507: 503: 438: 434: 432: 419: 409: 397: 395: 370: 362:Canada goose 327: 311: 291: 259: 247: 225:, and other 208: 201: 198:Forest snags 155: 146: 123: 117:October 2016 114: 104: 97: 90: 83: 71: 59:Please help 54:verification 51: 1885:WikiProject 1809:smokejumper 1789:Firefighter 1752:Occupations 1736:Woodworking 1317:Forestation 1248:restoration 1203:informatics 1068:Ecoforestry 782:(1): 8–17. 541:(1): 2–11. 479:Tree hollow 416:Puget Sound 318:kingfishers 304:that reset 188:Scandinavia 2005:Categories 1831:Lumberjack 1826:Log scaler 1709:engineered 1660:non-timber 1633:sawmilling 1585:Industries 1552:svedjebruk 1263:transition 1243:protection 1233:old-growth 1218:governance 1173:Dendrology 1123:management 989:Ministries 752:1885/60278 679:2016-10-22 535:Biotropica 485:References 421:Montgomery 404:operated " 381:Murray cod 344:sites for 87:newspapers 2031:Limnology 2016:Dead wood 1779:Ecologist 1692:Tree farm 1593:Coppicing 1535:chitemene 1435:Acid rain 1383:allometry 1305:SmartWood 1253:secondary 1238:pathology 1213:inventory 1151:driftwood 1017:Arbor Day 879:1526-100X 835:1365-2745 796:1552-5228 761:1540-9309 615:1932-6203 563:1744-7429 406:snagboats 398:deadheads 373:Australia 334:Australia 231:consumers 27:Dead tree 1980:Category 1794:handcrew 1764:Arborist 1759:Forester 1719:mahogany 1665:palm oil 1655:charcoal 1640:Products 1575:Wildfire 1388:breeding 1349:GM trees 1198:dynamics 1010:Journals 1003:Colleges 963:Forestry 633:25615612 585:PLOS ONE 453:See also 342:spawning 298:wildfire 215:bacteria 2026:Habitat 1990:Outline 1804:lookout 1799:hotshot 1680:tanbark 1650:biomass 1645:biochar 1623:plywood 1608:Logging 1512:wilding 1161:log jam 1118:Ecology 859:Bibcode 731:Bibcode 656:3830575 624:4304802 593:Bibcode 543:Bibcode 439:torraka 414:in the 350:biofilm 223:insects 192:Finland 180:habitat 172:streams 152:ecology 101:scholar 1836:Ranger 1784:Feller 1769:Bucker 1675:rubber 1618:lumber 1428:topics 1415:volume 1410:height 1356:i-Tree 1193:Forest 1146:coarse 1141:Debris 1040:dehesa 877:  833:  794:  759:  654:  631:  621:  613:  561:  338:rivers 314:osprey 271:Alerce 168:rivers 149:forest 103:  96:  89:  82:  74:  1670:rayon 1405:girth 1400:crown 1361:urban 1258:stand 1166:slash 1156:large 1027:Types 975:Index 698:512p. 652:JSTOR 279:birch 275:aspen 219:fungi 108:JSTOR 94:books 18:Snags 1729:teak 1714:fuel 1704:Wood 1524:REDD 1378:Tree 1295:PEFC 1280:ATFS 926:Snag 875:ISSN 831:ISSN 792:ISSN 757:ISSN 629:PMID 611:ISSN 559:ISSN 435:kelo 346:fish 277:and 265:and 217:and 170:and 160:tree 156:snag 154:, a 80:news 1300:SFI 1290:FSC 1285:CFS 1223:law 1208:IPM 1120:and 867:doi 823:doi 784:doi 747:hdl 739:doi 619:PMC 601:doi 551:doi 512:doi 508:161 371:In 332:in 328:In 316:or 300:or 147:In 63:by 2007:: 887:^ 873:. 865:. 855:10 853:. 829:. 819:97 817:. 813:. 790:. 778:. 755:. 745:. 737:. 725:. 721:. 688:^ 672:. 627:. 617:. 609:. 599:. 589:10 587:. 583:. 571:^ 557:. 549:. 539:30 537:. 524:^ 506:. 493:^ 360:A 240:A 221:, 955:e 948:t 941:v 881:. 869:: 861:: 837:. 825:: 798:. 786:: 780:1 763:. 749:: 741:: 733:: 727:9 682:. 658:. 635:. 603:: 595:: 565:. 553:: 545:: 518:. 514:: 130:) 124:( 119:) 115:( 105:· 98:· 91:· 84:· 57:. 34:. 20:)

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Snags
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forest
ecology
tree
freshwater ecology
rivers
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coarse woody debris
habitat
river navigation
Scandinavia
Finland
coarse woody debris
decaying wood
bacteria
fungi
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