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Significant additions to the butterflies of the Trinity Alps and Mount Eddy, northern California PDF

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Preview Significant additions to the butterflies of the Trinity Alps and Mount Eddy, northern California

JournalofResearchontheLepidoptera 29(l-2):33-36, 1990(91) Significant Additions to the Butterflies of the Trinity Alps and Mount Eddy, Northern California Arthur M. Shapiro DepartmentofZoology,UniversityofCalifornia, Davis, California95615 The Trinity Alps and Trinity Divide, including Mount Eddy, are situated in northwestern California and provide high-montane, sub- alpineandalpineenvironmentsofgranitic,metamorphic,andultrabasic substratesfarremovedfromthe SierraNevadaandthusofconsiderable biogeographicinterest. Thebutterflyfaunisticsandecologyoftheregion were investigatedby Shapiro, Palm andWcislo (1981), Shapiro,A. M., ( C. A. Palm & K. L. Wcislo. 1981. The ecology and biogeography ofthe TrinityAlpsandMountEddy,northernCalifornia,J. Res. Lepid. 18: 69- 152), who based on five years5 field work reported 115 species. Despite frequentvisitsinthe subsequenteightfieldseasons, onlyone additional species has been recorded. However, of the hundreds of additional records and the twenty-five orthirty new collection sites, a number are ofspecialinterestandbearonourunderstandingofthebiogeographyof theregion. Thispaperreportsthemostimportantofthenewinformation gathered since 1980. It is intended to be used with Shapiro, Palm and Wcislo (1981). New locality and capture data are presented by species; page numbers refer to the original text. The followingare the most significant ofthe new localities, presented winhithcehftohremyatcaonfAbpepfeonudnidxaIr(eppB.K14-—5-1B4o7)n.anTzhaeK1i5'ntgoapongdraDph—icDalunmsampusiro.n Since 1981 a large number ofnew 7.5' quadrangles have appeared, so most ofthe study area is now mapped on a much finer scale. The 7.5' quadrangles are also identified for the new localities. Asbestos Gulch: 4 km SW Horse Heaven Meadows; hillside seep with tufa deposits,unusualvegetation(discussedbelow);TrinityDivide: 1603 m. (Seven Lakes Basin 7.5') CrowCreek: Darlingtoniabognearjet. CrowCreekandEForkTrinityRiver, 1220 m. (Mumbo Basin 7.5') BK Horse Flat Camp: Lowermontane mixedforest, 5.3 kmup Eagle Creekfrom trailhead, 1450 m. BK Horse Heaven Meadows: Ledum bog, Castle Creek Road at E Fork Trinity RiverbelowGreyRocks, 1.6kmWWhalenSummit, 1767m. (SevenLakesBasin D 7.5') Additions to Annotated List ofSpecies 2. Oeneis nevadensis Felder and Felder, (p. 92) RECORDS: Horse Heaven Meadows, 21.VI.86. 4. Cercyonispegala boopis Behr. (p. 93) RECORDS: Deadfall Meadow, 22.VI.86. 34 J. Res. Lepid. 21. Phyciodes orseis orseis Edwards, (p. 99) RECORDS: HorseHeavenMeadows,21.VL86;DeadfallMeadow(3),22.VI.1986. 33. Precis coenia Hbn. (p. 103) RECORDS: Horse HeavenMeadows, 21.VI.86. 34. Limenitis lorquini Bdv. (p. 103) RECORDS: Horse HeavenMeadows, 22.VI.86. 37. Lycaena arota Bdv. (p. 104) RECORDS: Horse Heaven Meadows, 5.DC.87. 41. Lycaena mariposa Reak. (p. 106) RECORDS: Horse HeavenMeadows, 21.VI.86, 5.IX.87. 49A. Mitourajohnsoni Skinner. Johnson’s Hairstreak. The only additional species from the region, a large female collected from flowers ofLedumglandulosum Nutt. var. californicum (Kell.) Hitchc. RECORDS: Horse Heaven Meadows, 21.VI.86. 54. Callophrys lemberti Tilden. (p. Ill) RECORDS: MountEddy summit, 18.VI.89. 57. Glaucopsychepiasus Bdv. (p. 112) RECORDS: CoffeeCreek,1000m,20.VI.89;HorseFlatCamp,21.VI.89;Deadfall Meadow (4), 22.VI.1986. 66. Agriadesglandon Prunner. (p. 115) RECORDS: Horse HeavenMeadows, 21.VI.86; Crow Creek, 21.VI.86. 71. Neophasia menapia Feld. & Feld. (p. 117) RECORDS: Horse HeavenMeadows, 5.DC.87. 88A. Euphyes vestris Bdv. (p. 123) RECORDS: Crow Creek(4), 21.VI.1986. 94. Hesperia harpalus Edwards (.H. “comma complex”) (p. 124) As noted in the original text, Trinity-Eddy populations are extraordinarily variable. On5.IX.1987aseriesof70specimens(29 ?,41 /)wastakenonthetufa exposure nearAsbestos Gulch in the Trinity Divide. This represented a small fractionofthenumberofanimalsflyinginthedensestpopulationofthiscomplex Ihaveeverseenoutsidehighdesert. Thevariabilitywas extreme, evenforthis region. A sample is illustrated in figs. 1 and 2. The most extensively-marked maleswerestronglyreminiscentofH. lindseyiHolland. Alloftheanimals,along withPolitessabuleti Bdv. andHesperiajuba Scudder,werevisitingflowersofa dwarfed ecotype ofrabbitbrush, Chrysothamnus nauseosus (Pall.) Brit, which was the aspect dominant on the site. Associated with it were Cirsium breweri (Gray) Jeps. (mostly already setting seed) and Triglochin maritima L., both stronglycalciphilic and the lattervery local inland. 100. Carterocephaluspalaemon Pallas, (p. 126) RECORDS: Horse Heaven Meadows, 21.VI.86. 104. Erynnis icelus Scud. & Burg. (p. 127) RECORDS: Horse Flat Camp, 21.VI.89; Horse HeavenMeadows, 21.VI.86. 107. Erynnispersius Scudder. (p. 128) RECORDS: Horse Heaven Meadows, 5.IX.87. col- the (not complex" 5JX.1987 "comma Co., HesperiaTrinity 1). Gulch, some fig. of as Asbestos Surfaces individuals near Ventral lecfed same 2. Fig. col- complex" 5.SX.1987. comma " Co., Trinity Hesperia Gulch, some of Asbestos surfaces near Dorsal lected 36 J. Res. Lepid. Discussion Most of the Horse Heaven Meadows records represent either first collections or significant range extensions within the Trinity Divide, which has been rather poorly documented except for Mount Eddy and DeadfallMeadow. MostoftheTrinityDivideisrelativelylowandheavily forested, and until very recently 7.5' topographic quadrangles were not available for it. It is crisscrossed by old logging and mining roads and Jeeptrails, andbyrelativelyrandomwanderingonthemitispossibleto encounterunusualhabitats, includingtheLedumbogatHorseHeaven, theDarlingtonia bog at Crow Creek, and the tufa exposure atAsbestos Gulch, all of which produced important records. The Crow Creek Euphyes vestris connect the previously-known and isolated colonies at ScottMountainSummitandMountShastaCity, andsuggestthatmany other colonies of this very local skipper may exist in the region. Carterocephalus palaemon was previously unrecorded in the Trinity Divide. ThemanyspeciescollectedatHorseHeavenandelsewhereinthe vicinitydocumenttheecologicalbreadthwhichallowsthemtotranscend the edaphic and vegetational complexity of northern California; the montane fauna is much more eurytopic thanthe sub-alpine and alpine. At least one species enters the eastern fringe ofthe Trinity Divide, but fails to extend more than about 6 km west ofInterstate 5. This is the — apparentLycaena editha Mead L. xanthoides Bdv. intergrade, which iscommonatDunsmuirandextendslocallywestwardalongtheCallahan- GazelleRoad,butisotherwise absentformtheTrinities andEddies. Its distribution does not correlate very well with climate or vegetation. TheAsbestosGulchseriesofHesperia,embracingasmuchvariationas occurs in the entire region, includes specimens which if taken out of context could be called three different subspecies. One wonders how many taxonomic decisions have been predicated on such small and unrepresentative samples! Acknowledgments. This researchhas been supportedby CaliforniaAgricultural Experiment Station project CA-D*-AZO-3994-H, “Climatic Range Limitation of PhytophagousLepidopterans.” IthankDavidOlson, LindaFarley, BillOverton, JohnWagoner,andHansjiirgGeigerforfieldassistance. Thephotographsareby SamuelW. Woo.

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