mammal surveys in great basin national park: assessment of historical faunal change
DESCRIPTION
Mammal Surveys in Great Basin National Park: Assessment of Historical Faunal Change. Eric Rickart & Shannen Robson. Utah Museum of Natural History University of Utah. METHODS. Historical data sources. Museum of Vertebrate Zoology (MVZ) 1929-1939 field surveys. Other records – 1940-1990 - PowerPoint PPT PresentationTRANSCRIPT
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Mammal Surveys in Great Basin National Park:Assessment of Historical Faunal ChangeEric Rickart & Shannen RobsonUtah Museum of Natural HistoryUniversity of Utah
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METHODSHistorical data sourcesMuseum of Vertebrate Zoology (MVZ)1929-1939 field surveysOther records 1940-1990 Publications MaNIS museum networkUMNH-FMNH survey 2000NPS I&M (UMNH) 2002-2003Recent data sourcesGRBA sight reports 1994-2004
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GENERAL SURVEY RESULTSHistorical records (pre-1990)
Park: 390 records 31 species Park region: 893 records 48 species Recent surveys (2000-2003)
4379 trap nights 642 records 26 speciesGRBA sight reports
366 reports 22 species(non-volant mammals)Species Totals Park Greater region
Non-volants 42 54 Total (incl. bats) 49 67
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Shrews (small mammal exemplars)Uncommon habitat specialists
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2003Historical change
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Resurvey protocolRelocate historical collecting sites that were densely sampled Determine historical sampling effortAssess habitat changes (notes and photographs)Do comparable modern samplingInterpret local faunal changesLocal site assessments:Broader scale (landscape) assessments:Shifts in elevation ranges of speciesSpecimen counts as a proxy for effort
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Survey localitiesHistorical &RecentSurvey comparison
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Resurvey comparisons-- Four elevation binsLow: 5300-6700 ft 67 10 65 12 (ca. 1600-2050 m)
Mid: 7000-8000 ft 125 14 56 7 (ca. 2150-2450 m)
High: 8100-10500 ft 79 7 80 8 (ca. 2450-3200 m)
Alpine: 10700-11200 ft 30 7 28 5 (ca. 3250-3400 m) Historical ModernElevation (1929-1939) (2000-2003) records species records species
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Low elevation
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Low elevation
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Mid elevation
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Mid elevation
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High elevation
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High elevation
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Alpine
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Alpine
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Least chipmunk (Tamias minimus)Great Basin pocket mouse (Perognathus parvus)Species responding to loss/shift of sagebrush habitat
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Uinta chipmunk (Tamias umbrinus)Pion mouse (Peromyscus truei)Species increasing with spread of pion-juniper
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Species responding to cheatgrass invasionExpandingHarvest mouse (Reithrodontomys megalotis)Long-tailed vole (Microtus longicaudus)
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Desert woodrat (Neotoma lepida)Bushy-tailed woodrat (Neotoma cinerea)Declining woodrats
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Yellow-bellied marmot(Marmota flaviventris)Porcupine(Erethizon dorsatum)Uncommon species
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Cougar(Puma concolor)Beaver(Castor canadensis)Keystone species
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Acknowledgements