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Proceedings of the Indiana Academy of Science 1 14(2): 1 1 1-206

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Proceedings of the Indiana Academy of Science 1 14(2): 1 1 1-206 2005. Proceedings of the Indiana Academy of Science 1 14(2): 1 1 1-206 THE SPIDER SPECIES OF THE GREAT LAKES STATES 1 2 3 4 Petra Sierwald , Michael L. Draney , Thomas Prentice , Frank Pascoe , Nina 1 5 2 1 Sandlin , Elizabeth M. Lehman , Vicki Medland , and James Louderman : 'Zoology, The Field Museum, 1400 S Lake Shore Drive, Chicago, Illinois 60605; 2Department of Natural and Applied Sciences and Cofrin Center for Biodiversity, University of Wisconsin-Green Bay, 2420 Nicolet Drive, Green Bay, Wisconsin 3 5431 1; Department of Entomology, University of California, Riverside, California 92521; 4Biology, College of St. Francis, 500 Wilcox Street, Joliet, Illinois 60435: 5 Department of Biology, Indiana University, Bloomington, Indiana 47405 ABSTRACT. Critical analysis of existing spider species lists for Wisconsin, Michigan, Ohio. Indiana and Illinois reveals 900 species recorded from the five-state region (284 genera, 40 families). All non- native, Palearctic, or otherwise questionable species records were scrutinized, and their status is discussed. The most speciose families in the region are the Linyphiidae (almost 24% of species), Salticidae (10.3%), Theridiidae (8.9%), Lycosidae (8.8%), and Araneidae (7.7%). All sources used for spider species names and species records are unambiguously quoted. Spider species records are presented in tables allowing comparison of family composition among the states, and prediction of number of heretofore unrecorded species. Richness among states is analyzed and found to be dependent on varying degrees of sampling effort. As a new tool, a Spider Species Name Concordance Table allows tracking previously published spider species names to the currently valid name of every species record. The study demonstrates the need for crucial pieces of scientific infrastructure, such as complete species catalogs, and the great utilit\ of faunistic and taxonomic data to meet today's biodiversity challenges. Keywords: Midwest spider fauna, checklist, faunistics, Araneae, gap analysis, Illinois, Indiana. Ohio. Wisconsin, Michigan In the past, faunal studies and alpha-taxo- majority of animal biodiversity, the inverte- nomic work played a significant role in bio- brates, remains on the sideline. We often logical research. Their importance and influ- know so little about species' ranges and abun- ence in biological science diminished during dance that species-richness estimates for any the past 6 decades (Wheeler 2004), especially particular habitat or region are vague and un- in the developed (and supposedly well-stud- certain. ied) regions in the world, such as Europe and Spiders, a mega-diverse group with 38.000 North America. The recent focus on biodiver- described species (Platnick 2005) are a case sity decline and conservation efforts demon- in point. As insect predators, they pla\ a piv- strates significant gaps in our faunistic knowl- otal role in the regulation of insect populations edge. While species discovery for vertebrates in all terrestrial habitats. Species lists offer is well advanced, the discovery of the major- solid baseline data for large-scale biogeo- ity of non-vertebrate species on the planet graphic analyses, survey and monitoring ef- (Agenda 2000) lags far behind (Knapp et al. forts, and tracking of environmental changes. 2005). A 139% increase of recorded bivalve These lists form the foundation o( species- species from the Florida Keys between 1995 richness estimates. Yet, reliable, up-to-date and 2004 illustrates the point (Bieler & Mik- kelsen 2004). spider species lists for the 50 United States Conservation efforts focus mainly on the are not available, because faunistic research estimated species-richness of habitats and the declined (and lost funding) before the job was occurrence of endangered and threatened spe- done (Crawford 1988). Consequently, the cur- cies (Mace 2004). Charismatic vertebrate spe- rent assemblage of spider species lists suffers cies and their protection are most often in- from several problems, impeding biogeo- voked in conservation actions, whereas the graphic research as well as hampering their 111 112 PROCEEDINGS OF THE INDIANA ACADEMY OF SCIENCE utility for ecological research and conserva- imens can be re-examined at any time for ad- tion efforts. ditional data, such as sex, size, abundance, Spider species lists for various states and and intraspecific variability; misidentifications habitats were completed over a long period of will be rooted out over time. What stands be- time. The species records for the five states tween us and such a rich data source is the covered here are gleaned from the literature simple fact that the data of most invertebrate, dating back 50 years for Wisconsin (Levi & especially arthropod collections, have not Field 1954), while Indiana and Illinois were been electronically captured, and, at the cur- covered recently (Beatty 2002). Species rent meager state of collection support, we names changed during this period. While such cannot expect access to these data any time name changes are often somewhat naively de- soon. cried as hampering the accessibility of the rec- What measures, then, can be taken now to ords (Golding & Timberlake 2003), it is im- accelerate the rate of biodiversity discovery, perative to assert that such name changes are either through sampling in nature or mining the result of significant and badly needed of museum collections? The existing faunistic progress in the systematics of the animals in- and taxonomic literature harbors a wealth of volved (see for example Froese & Pauly biogeographic data; making these legacy data 2005). Since invertebrates in general, and spi- universally available, i.e., electronically and ders in particular are species-rich and require nomenclatorially updated, will serve a wide highly trained taxon-experts for identification, range of users, from researchers to land man- more name changes can be expected in the agers to collection managers. Various taxo- decades to come. Authors of previous species nomic authority files can be generated from lists used various cross-reference methods to such cross-referenced legacy data, e.g., gen- make lists compatible by citing older names erating species lists for states, regions, or hab- in their lists, but these in turn became quickly itats, aiding in museum collection manage- out-dated. Therefore, employing such lists for ment, and guiding future survey and various research and conservation tasks re- monitoring efforts. The present study clearly quires significant taxon-expertise and general demonstrates the great utility and predictive users, especially within the ecological re- power of old-fashioned faunistics required for search and conservation communities, still today's biodiversity research. face obstacles interpreting and using these Our approach.—Two of the prevailing records (Gotelli 2004). problems inherent to traditional faunal lists Traditional forms of printed publications of are the nomenclatorial changes due to time individual species lists hamper regional and gaps and the isolation of lists from one anoth- inter-state comparisons of species records. In er, hampering comparison and predictions. connection with the significant time-gap be- Using modern database technologies and elec- tween individual faunal lists and the inevitable tronic dissemination over the Web (Scoble nomenclatorial changes, such species lists do 2004), these problems can be easily overcome not support biogeographic research (Soberon today. However, even with these technologies, & Peterson 2004), nor do they offer easy ac- keeping checklists and nomenclature up-to- cess to species-richness estimates. There are date requires expertise by sufficiently sup- currently numerous activities with respect to ported taxon-specialists. Spider systematics GIS software development (e.g., Lifemapper, benefited from a relatively large number of http://Lifemapper.org) to generate distribution active spider systematists, when compared to '. maps. The goal is a . predictive, electronic other rather neglected groups, such as many atlas of Earth's biological diversity,' the data other terrestrial arthropods (e.g., the Myriap- '. for which must be retrieved from . records oda, see Milli-PEET, Field Museum Website). of millions of plants and animals in the Furthermore, spider systematics is boosted by world's natural history museums.' Certainly, a rare piece of scientific infrastructure, an on- locality data taken directly from actual collec- line world-wide taxonomic catalog (Platnick tion specimens would provide the best possi- 2005). Such a catalog, generated and main- ble foundation of species-richness estimates tained by a taxon expert, forms the standard- and biogeographic research (Graham et al. ized base for all spider species names used 2004). Furthermore, vouchered museum spec- here. The need for such standardization is SIERWALD ET AL.—SPIDER SPECIES OF THE GREAT LAKES STATES 113 readily acknowledged by the conservation and ecology user community (e.g., NatureServe's Central Databases, \ . a "standard" name is .' selected and maintained . for every taxon tracked in its database'). To track name changes we employ the Spi- der Species Name Concordance Table (Ap- pendix II). The table contains all species names and genus-species combinations pres- ent in the referenced species lists (see Liter- ature Cited) with their currently valid name according to Platnick (2005). Appendix II is available online at http://www.uwgb.udu/ biodiversity/glspiders. Comparisons
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