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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 Presentation
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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
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
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
Shrews (small mammal exemplars)Uncommon habitat specialists
2003Historical change
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
Survey localitiesHistorical &RecentSurvey comparison
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
Low elevation
Low elevation
Mid elevation
Mid elevation
High elevation
High elevation
Alpine
Alpine
Least chipmunk (Tamias minimus)Great Basin pocket mouse (Perognathus parvus)Species responding to loss/shift of sagebrush habitat
Uinta chipmunk (Tamias umbrinus)Pion mouse (Peromyscus truei)Species increasing with spread of pion-juniper
Species responding to cheatgrass invasionExpandingHarvest mouse (Reithrodontomys megalotis)Long-tailed vole (Microtus longicaudus)
Desert woodrat (Neotoma lepida)Bushy-tailed woodrat (Neotoma cinerea)Declining woodrats
Yellow-bellied marmot(Marmota flaviventris)Porcupine(Erethizon dorsatum)Uncommon species
Cougar(Puma concolor)Beaver(Castor canadensis)Keystone species
Acknowledgements
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