Landbird Monitoring in the Sonoran Desert Network Status Report 2008
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National Park Service U.S. Department of the Interior Natural Resource Program Center Landbird Monitoring in the Sonoran Desert Network Status Report 2008 Natural Resource Technical Report NPS/SODN/NRTR–2009/0XX ON THE COVER Greater roadrunner (Geococcyx californianus). Photo ©Greg Lavaty. Landbird Monitoring in the Sonoran Desert Network Status Report 2008 Natural Resource Technical Report NPS/SODN/NRTR–2009/0XX Author Aaron Flesch School of Natural Resources 325 Biological Sciences East Tucson, Arizona 85721 Editing and Design Alice Wondrak Biel Sonoran Desert Network 7660 E. Broadway Blvd, Suite 303 Tucson, Arizona 85710 Month 2009 U.S. Department of the Interior National Park Service Natural Resource Program Center Fort Collins, Colorado The Natural Resource Publication series addresses natural resource topics that are of interest and applicability to a broad readership in the National Park Service and to others in the management of natural resources, including the scientifi c community, the public, and the NPS conservation and environmental constituencies. Manuscripts are peer-reviewed to ensure that the information is scientifi cally credible, technically accurate, appropriately written for the intended audience, and is designed and published in a professional manner. The Natural Resource Technical Report series is used to disseminate the peer-reviewed results of scientifi c studies in the physical, biological, and social sciences for both the advancement of science and the achievement of the National Park Service’s mission. The reports provide contributors with a forum for displaying comprehensive data that are often deleted from journals because of page limitations. Current examples of such reports include the results of research that addresses natural resource management issues; natural resource inventory and monitoring activities; resource assessment reports; scientifi c literature reviews; and peer-reviewed proceedings of technical workshops, conferences, or symposia. Views, statements, fi ndings, conclusions, recommendations, and data in this report are solely those of the author(s) and do not necessarily refl ect views and policies of the U.S. Department of the Interior, National Park Service. Mention of trade names or commercial products does not constitute endorsement or recommendation for use by the National Park Service. Printed copies of reports in this series may be produced in limited quantity, and are only available as long as the supply lasts. You may send a request to: Sonoran Desert Network 7660 E. Broadway Blvd, Suite 303 Tucson, Arizona 85710 This report is also available electronically from the Learning Center of the American Southwest, http://southwestlearning.org, or at http://www.nature.nps.gov/publications/NRPM/index.cfm. Please cite this publication as: Flesch, A. 2009. Landbird monitoring in the Sonoran Desert Network: Status report 2008. Natural Resource Technical Report NPS/XXXN/NRTR–2009/0XX. National Park Service, Fort Collins, Colorado. NPS D-XXX, Month 2009 http://southwestlearning.org SONORAN DESERT NETWORK Landbird Monitoring PROJECT REPORT U.S. FISH AND WILDLIFE SERVICE/KARNEY U.S. FISH Status Report 2008 Aaron Flesch, University of Arizona Introduction Background The primary mission of the National Park Service (NPS) is to protect and preserve natural and cultural resources for future generations. Responding to criticism that it lacked basic infor- mation on the condition of natural resources within national parks, the NPS initiated a servicewide Inventory and Monitor- ing (I&M) Program to determine status and trends in ecologi- cal resources (NPS 1992). Gambel’s quail (Callipepla gambelii). Established in 2001, the Sonoran Desert Network (SODN) In- parks.1 These parameters focus on trend information. Detailed ventory and Monitoring Program includes 11 parks in south- data exploration (including external data sources) and trend ern Arizona and New Mexico that range in size from 356 analysis of landbird data and will be explored in detail in the (Tumacácori National Historical Park) to 133,882 hectares network’s comprehensive Synthesis and Trends reports, to be (Organ Pipe Cactus National Monument). Collectively, these released at fi ve-year intervals (Powell et al. 2007). parks are representative of most of the ecological communi- ties present within the Sonoran Desert and Apache Highlands In the meantime, parameters to be reported in annual status Ecoregions (NPS 2005). reports, such as this one, include (1) total detections by spe- cies, park, and habitat type; (2) community composition, (3) observations of breeding behaviors; and (4) notable observa- Birds as a focus for monitoring tions and species additions. This annual status report provides In 2005, SODN staff completed a monitoring plan that identi- a brief summary of SODN landbird monitoring efforts and fi ed “vital signs,” or parameters, representing a diverse range results during the 2008 fi eld season. This report also outlines of natural resources including air, water, climate, soils, plants, changes made to the network’s landbird monitoring protocol invertebrates, and vertebrates (NPS 2005). During this pro- and provides additional background and recommendations to cess, population parameters of landbirds were considered aid future implementation. among the most feasible vertebrate parameters for long-term monitoring, in part because birds are highly detectable, easy to survey, and because they are good indicators of the environ- Methods mental conditions upon which they depend. Sampling design In 2008, we surveyed landbirds within all seven parks that Goal and parameters were sampled in 2007 (CAGR, FOBO, ORPI, MOCC/ The overall goal of the SODN landbird monitoring program is MOWE, SAGE/SAGW, TUMA, and TUZI), and one addi- to detect biologically signifi cant changes in bird populations tional park (TONT), where we surveyed three transects (Table over time. To achieve this goal, we are monitoring for density 1; all tables appear after main text. See box, next page, for park of the most-common species in SODN parks, and estimat- acronyms). We also added a riparian transect (Rip-2) at ORPI ing the proportion of sites occupied for most species in most in 2008. We surveyed a total of 34 transects, with the number 1The advantages and limitations of monitoring for density and proportion of sites occupied are discussed in detail in the SODN Landbird Monitoring Protocol (Powell et al. 2007). 1.23.09 Prepared by Andy Hubbard, Sonoran Desert Network 2 Landbird Monitoring: Status Report 2008 We maintained four visits in riparian areas because higher en- Park acronyms used in this document counter rates in these vegetation communities made monitor- CAGR Casa Grande Ruins National Monument ing more effi cient. Seasonal timing of surveys varied among CHIR Chiricahua National Monument parks. Timing of initial surveys was earlier in low-elevation CORO Coronado National Memorial parks (CAGR, ORPI, and SAGW) and later in mid-elevation FOBO Fort Bowie National Historic Site parks (SAGE, FOBO, TUMA) and those in the Verde Valley GICL Gila Cliff Dwellings National Monument (MOCC/MOWE and TUZI). Variation in timing was intended to account for differences in the onset of breeding for most spe- MOCC Montezuma Castle National Monument (Castle Unit) cies in each park. We spaced surveys a minimum of 1.5 weeks MOWE Montezuma Castle National Monument apart and completed all surveys by July 3 (see Table 1). (Well Unit) We used the point-transect survey method (Nelson and Fancy ORPI Organ Pipe Cactus National Monument 1999, Buckland et al. 2001), which is the most widespread and SAGE Saguaro National Park (Rincon Mountain Unit) accepted method for estimating landbird density (Rosenstock SAGW Saguaro National Park et al. 2002). Details on how to conduct point-transect surveys (Tucson Mountain District) are provided in Powell and others (2007) and briefl y outlined TONT Tonto National Monument here. TUMA Tumacácori National Historical Park We spent eight minutes at each station and used a rangefi nd- TUZI Tuzigoot National Monument er to estimate the linear distance to each bird detected. We recorded all birds, regardless of detection distance from the of transects per park ranging from 1 at CAGR to 6 at SAGE. surveyor, including birds fl ying over observers. After counts Sites in each park were classifi ed as either riparian or upland; were completed, observers located successive survey points we classifi ed these sites separately because of variation in bird with use of a handheld GPS. While walking between points, communities and because we wanted to focus some survey ef- observers searched for species not recorded during the count fort in riparian communities (see Powell et al. 2007). period. Although monitoring staff deviated from the published protocol at ORPI in 2007, by working in groups of two, we surveyed transects independently in 2008. Site establishment In most parks, we used sites selected with methodology out- Changes to the protocol lined in Powell et al. (2007) (see Appendix A). Exceptions oc- curred at Organ Pipe Cactus NM and Saguaro NP. In 2007, We made a few small changes to the SODN landbird monitor- safety concerns related to undocumented immigration and ing protocol in 2008. First, we differentiated auditory detec- smuggling at ORPI led park managers to institute travel re- tions with use of three classifi cations: singing (S), calling (C), strictions that created signifi cant obstacles for monitoring staff and sounds made by birds’ wings