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(Arachnida: Araneae) of Mount Katahdin, Baxter State Park, Maine, USA

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(Arachnida: Araneae) of Mount Katahdin, Baxter State Park, Maine, USA Maine State Library Digital Maine Forest Service Documents Maine Forest Service 10-1-2012 An Annotated Checklist of The Spiders (Arachnida: Araneae) of Mount Katahdin, Baxter State Park, Maine, USA. Maine Forest Service Forest Health and Monitoring Division Follow this and additional works at: https://digitalmaine.com/for_docs Recommended Citation Maine Forest Service, "An Annotated Checklist of The Spiders (Arachnida: Araneae) of Mount Katahdin, Baxter State Park, Maine, USA." (2012). Forest Service Documents. 251. https://digitalmaine.com/for_docs/251 This Text is brought to you for free and open access by the Maine Forest Service at Digital Maine. It has been accepted for inclusion in Forest Service Documents by an authorized administrator of Digital Maine. For more information, please contact [email protected]. AN ANNOTATED CHECKLIST OF THE SPIDERS (ARACHNIDA: ARANEAE) OF MOUNT KATAHDIN, BAXTER STATE PARK, MAINE, USA By Daniel T. Jennings Charles D. Dondale James H. Redner Forest Health and Monitoring Maine Forest Service Technical Report No. 45 MAINE DEPARTMENT OF AGRICULTURE, CONSERVATION AND FORESTRY October 2012 Augusta, Maine AN ANNOTATED CHECKLIST OF THE SPIDERS (ARACHNIDA: ARANEAE) OF MOUNT KATAHDIN, BAXTER STATE PARK, MAINE, USA By Daniel T. Jennings1,3 Charles D. Dondale2,3 James H. Redner3,3 1 Northern Forest Experiment Station, 686 Government Road, Bradley, ME 04411. Corresponding author’s current address: P. O. Box 130, Garland, ME 04939 2 Canadian National Collection of Insects and Arachnids, Research Branch, Agriculture & Agri-Food Canada, 960 Carling Avenue, Ottawa, Ontario. K1A OC6 3 Retired. Portions of this research were completed during the authors’ tenure at their respective institutions. Abstract The spider fauna of Mount Katahdin comprises 145 species of 16 families, and 90 genera, based on published and unpublished records. Most species were taken during a spider-collecting expedition in 1986, resulting in a 229.5% increase over the previously known fauna of 44 species. Species richness per family ranges from one (Cybaeidae, Pisauridae) to 59 (Linyphiidae), with the Lycosidae ranking second and the Theridiidae third. Foraging guild composition is skewed in favor of web spinners, largely due to linyphiid richness. Historically, collections of Mount Katahdin spiders have yielded type specimens of five new species and 18 new state records; however, an additional 110 species are likely to inhabit spruce-fir forests on Mount Katahdin. The current fauna represents ca. 57% of the potential fauna. Assessment of the actual fauna will require additional spatial and temporal sampling in more diverse habitats and strata. Off-trail hiking and climate change may adversely impact unique species of spiders associated with fragile subalpine-alpine communities near the summit. Table of Contents Introduction ..................................................................................................................................... 2 Materials and Methods .................................................................................................................... 2 Pitfall traps ................................................................................................................................................................ 2 Sweep Nets ............................................................................................................................................................... 2 Beating Sheet ............................................................................................................................................................ 2 Searches .................................................................................................................................................................... 3 Spider Identifications ................................................................................................................................................ 3 Checklist Arrangement ............................................................................................................................................. 3 Collecting Localities, Dates, and Specimen Depositories......................................................................................... 3 Checklist of Mount Katahdin Spiders ............................................................................................. 4 AGELENIDAE (2 spp.) ............................................................................................................................................ 4 AMAUROBIIDAE (4 spp.) ...................................................................................................................................... 4 ARANEIDAE (7 spp.) .............................................................................................................................................. 5 CLUBIONIDAE (8 spp.) .......................................................................................................................................... 6 CYBAEIDAE (1 sp.) ................................................................................................................................................ 7 DICTYNIDAE (4 spp.) ............................................................................................................................................ 7 GNAPHOSIDAE (8 spp.) ......................................................................................................................................... 7 HAHNIIDAE (3 spp.) ............................................................................................................................................... 8 LINYPHIIDAE, Linyphiinae (22 spp.) .................................................................................................................... 9 LINYPHIIDAE, Erigoninae (37 spp.) .................................................................................................................... 11 LYCOSIDAE (17 spp.) .......................................................................................................................................... 15 PHILODROMIDAE (7 spp.) .................................................................................................................................. 17 PISAURIDAE (1 sp.) ............................................................................................................................................. 18 SALTICIDAE (3 spp.) ............................................................................................................................................ 18 TETRAGNATHIDAE (4 spp.) ............................................................................................................................... 18 THERIDIIDAE (10 spp.) ........................................................................................................................................ 19 THOMISIDAE (7 spp.) .......................................................................................................................................... 20 Uncertain Names and Records ...................................................................................................... 21 ARANEIDAE ......................................................................................................................................................... 21 GNAPHOSIDAE .................................................................................................................................................... 21 LINYPHIIDAE, Linyphiinae .................................................................................................................................. 22 LINYPHIIDAE, Erigoninae ................................................................................................................................... 22 LYCOSIDAE .......................................................................................................................................................... 22 SALTICIDAE ......................................................................................................................................................... 23 THERIDIIDAE ....................................................................................................................................................... 23 Results & Discussion .................................................................................................................... 23 Faunal Composition ................................................................................................................................................ 23 Early Collections .................................................................................................................................................... 24 Estimated fauna ...................................................................................................................................................... 25 Acknowledgments......................................................................................................................... 26 Literature Cited ............................................................................................................................. 26 Technical Report Series ................................................................................................................ 29 Printed under appropriation number: 013 04A
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