Identifying Priority Conservation Areas for the American Burying Beetle, <I>Nicrophorus Americanus</I> (Coleoptera
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University of Nebraska - Lincoln DigitalCommons@University of Nebraska - Lincoln US Fish & Wildlife Publications US Fish & Wildlife Service 2014 Identifying priority conservation areas for the American burying beetle, Nicrophorus americanus (Coleoptera: Silphidae), a habitat generalist Jessica D. Jurzenski Felsburg Holt & Ullevig, Lincoln, Nebraska, [email protected] Christopher F. Jorgensen Rainwater Basin Joint Venture, Grand Island, Nebraska Andy Bishop U.S. Fish and Wildlife Service, Grand Island, Nebraska, [email protected] Roger Grosse U.S. Fish and Wildlife Service, Grand Island, Nebraska, [email protected] John Riens US Fish and Wildlife Service, Klamath Falls, Oregon, [email protected] SeFoe nelloxtw pa thige fors aaddndition addal aitutionhorsal works at: http://digitalcommons.unl.edu/usfwspubs Part of the Entomology Commons, Environmental Indicators and Impact Assessment Commons, Environmental Monitoring Commons, Natural Resources and Conservation Commons, Natural Resources Management and Policy Commons, Sustainability Commons, and the Terrestrial and Aquatic Ecology Commons Jurzenski, Jessica D.; Jorgensen, Christopher F.; Bishop, Andy; Grosse, Roger; Riens, John; and Hoback, W. Wyatt, "Identifying priority conservation areas for the American burying beetle, Nicrophorus americanus (Coleoptera: Silphidae), a habitat generalist" (2014). US Fish & Wildlife Publications. 459. http://digitalcommons.unl.edu/usfwspubs/459 This Article is brought to you for free and open access by the US Fish & Wildlife Service at DigitalCommons@University of Nebraska - Lincoln. It has been accepted for inclusion in US Fish & Wildlife Publications by an authorized administrator of DigitalCommons@University of Nebraska - Lincoln. Authors Jessica D. Jurzenski, Christopher F. Jorgensen, Andy Bishop, Roger Grosse, John Riens, and W. Wyatt oH back This article is available at DigitalCommons@University of Nebraska - Lincoln: http://digitalcommons.unl.edu/usfwspubs/459 Systematics and Biodiversity (2014), 12(2): 149–162 Research Article Identifying priority conservation areas for the American burying beetle, Nicrophorus americanus (Coleoptera: Silphidae), a habitat generalist JESSICA D. JURZENSKI1*, CHRISTOPHER F. JORGENSEN2, ANDY BISHOP3, ROGER GROSSE3, JOHN RIENS4 & W. WYATT HOBACK5 1Felsburg Holt & Ullevig, Lincoln, Nebraska, USA 2Rainwater Basin Joint Venture, Grand Island, Nebraska, USA 3Rainwater Basin Joint Venture, U.S. Fish and Wildlife Service, Grand Island, Nebraska, USA 4Partners for Fish and Wildlife Program, Klamath Falls Fish and Wildlife Office, Klamath Falls, Oregon, USA 5Department of Biology, University of Nebraska - Kearney, Kearney, Nebraska, USA (Received 5 August 2013; revised 19 January 2014; accepted 4 February 2014) Conservation efforts leading to the recovery of the federally endangered American burying beetle (ABB), Nicrophorus americanus Olivier, have been challenging because of the unknown causes of its decline, difficulty in establishing habitat requirements, and unclear population distribution across the species’ range. Extant populations of this widespread generalist species occur in broadly separated regions of North America with varying habitat characteristics. A habitat suitability model for ABB in the Nebraska Sandhills was developed over the course of 3 years resulting in a final cross- validated spatial model. The succession of models from 2009 to 2011 indicated that most of the predictive variables stayed constant, but biased sampling and extrapolation areas affected classifier values differently. Variables associated with ABB occurrence were loamy sand, wetland and precipitation. Five variables, loam soil, agriculture, woodland, the average maximum temperature, and urban development, were associated with ABB absence. The 2011 cross-validated model produced an AUC value of 0.82 and provided areas designated as highly likely to support ABBs. By limiting the model extent to the Sandhills ecoregion and using threshold-dependent classifiers, the final habitat suitability model could be an important resource for wildlife managers engaged in the recovery of this habitat generalist. Key words: Area under the curve (AUC), endangered species, habitat suitability model, Nebraska Sandhills, threshold- dependent Introduction the species was only found on Block Island, off the Rhode Island coast and Oklahoma. The plan went on to recom- The American burying beetle (ABB), Nicrophorus ameri- mend the establishment of three populations of the ABB canus, was listed as federally endangered in 1989 (Fed- within four broad geographical areas in its historical eral Register 54 [133]: 29652-55) after the species range: the Northeast, Southeast, Midwest and Great Lakes disappearance from over 90% of its historical range States as criteria for reclassifying the species from endan- became apparent. Since that time, researchers have pro- gered to threatened. Shortly after publication of the recov- posed reasons for its decline, including pesticide use, arti- ery plan, isolated populations of ABB were found in ficial lighting, pathogen infection, competition and habitat Nebraska, South Dakota, Kansas and Texas. In recogni- alteration (Sikes & Raithel, 2002). Although the exact tion of this and other new species information, the 5-year causes are undetermined, certain regions throughout review completed for the ABB recommended a revision North America continue to support large populations, of the species recovery plan, which has yet to be published such as in the US Midwest (Jurzenski et al., 2011). A (USFWS, 2008a). Revision of the recovery plan will recovery plan, prepared for the ABB in 1991 (USFWS, involve setting new recovery goals and objectives heavily 1991), stated that of the previously known distribution reliant on knowledge of the ABB distribution and the covering most of the USA east of the Rocky Mountains, resources needed to sustain populations. To better understand the decline of ABB and its impor- *Correspondence to: Jessica D. Jurzenski. E-mail: jessica. [email protected] tance in North America, an introduction of burying beetle ISSN 1477-2000 print / 1478-0933 online Ó The Trustees of the Natural History Museum, London 2014. All Rights Reserved. http://dx.doi.org/10.1080/14772000.2014.892542 150 J. D. Jurzenski et al. natural history and biology is needed. Carrion beetles & Creighton, 1996; Jurzenski et al., 2011). Creighton & (family Silphidae), including burying beetles, compete for Schnell (1998) recorded movement of individual ABBs vertebrate carrion needed for sustenance and developing from open grassland to woodland, which suggests they offspring. Carrion beetles are able to locate dead verte- are not restricted by the overall habitat structure. Given brates by using sensitive chemoreceptors in their capitate the known distributions and different habitat types in antennae that detect molecules released by dead and Nebraska, Oklahoma and Rhode Island, ABB are success- decaying organisms (Dethier, 1947; Scott, 1998). Some ful across several landscape types and can have a larger carrion beetles, like the ABB, are nocturnal (Ratcliffe, niche breadth than many other Nicrophorus species 1996). Competition for decaying carcasses varies depend- (Lomolino & Creighton, 1996). ing on location, time of day, carcass age and carcass size Unfortunately, the limited understanding of the distri- (Scott, 1998). The competition for resources, such as car- bution of ABBs makes it difficult to designate priority rion, can be intense because it is scarce and unpredictable conservation sites or select reintroduction areas. More- in space and time. For ABB, their large size enables them over, for United States Fish and Wildlife Service to utilize larger carcasses (e.g. 80–374 g) excluding many (USFWS) personnel involved in making decisions about other burying beetles (e.g. 20–100 g) from competition proposed habitat alterations, the identification of basic (Kozol et al., 1988; Trumbo, 1992; Lomolino & habitat affinities of ABBs, even within localized regions, Creighton, 1996); however, it may increase competition would be very useful. Bishop et al. (2002) found that with larger, more dangerous vertebrate scavengers some carrion beetles in Nebraska showed preference for (Jurzenski & Hoback, 2011). Research has shown that soil textures and land use, but did not include the ABB in ABBs are attracted to and able to reproduce on various the study. In Oklahoma, Crawford & Hoagland (2010) types of carrion, including various mammals, reptiles and identified elevation, slope, soil association, surface geol- birds (Kozol et al., 1988; Bedick et al., 1999). ogy, land cover, forest cover, annual temperature, days The Nicrophorus genus is characterized by a burying below freezing, last growing season day and May precipi- behaviour displayed when preparing a carcass for repro- tation as predictor variables of ABB occurrence using a duction; in addition, they have been well-studied because Maxent model. As a habitat generalist, it is possible that of their extended biparental care of offspring (Trumbo, ABBs may not be associated with these same variables in 1994, 1996; Eggert et al., 1998; Scott, 1998). Initially, a different ecoregions. The lack of agricultural conversion carcass is assessed by Nicrophorus spp. for suitability and and sparse human population in Nebraska’s Sandhills viability for reproduction (Scott & Traniello, 1987: region is thought to contribute to the continued presence Trumbo et al., 1995). The surrounding habitat