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(Alopochen Aegyptiaca) in the Contiguous United States Author(S): Corey T History, Current Distribution, and Status of the Egyptian Goose (Alopochen aegyptiaca) In the Contiguous United States Author(s): Corey T. Callaghan and Daniel M. Brooks Source: The Southwestern Naturalist, 62(4):296-300. Published By: Southwestern Association of Naturalists https://doi.org/10.1894/0038-4909-62.4.296 URL: http://www.bioone.org/doi/full/10.1894/0038-4909-62.4.296 BioOne (www.bioone.org) is a nonprofit, online aggregation of core research in the biological, ecological, and environmental sciences. BioOne provides a sustainable online platform for over 170 journals and books published by nonprofit societies, associations, museums, institutions, and presses. Your use of this PDF, the BioOne Web site, and all posted and associated content indicates your acceptance of BioOne’s Terms of Use, available at www.bioone.org/page/terms_of_use. Usage of BioOne content is strictly limited to personal, educational, and non-commercial use. Commercial inquiries or rights and permissions requests should be directed to the individual publisher as copyright holder. BioOne sees sustainable scholarly publishing as an inherently collaborative enterprise connecting authors, nonprofit publishers, academic institutions, research libraries, and research funders in the common goal of maximizing access to critical research. 296 The Southwestern Naturalist vol. 62, no. 4 THE SOUTHWESTERN NATURALIST 62(4): 296–300 HISTORY, CURRENT DISTRIBUTION, AND STATUS OF THE EGYPTIAN GOOSE (ALOPOCHEN AEGYPTIACA) IN THE CONTIGUOUS UNITED STATES COREY T. C ALLAGHAN* AND DANIEL M. BROOKS Centre for Ecosystem Science, School of Biological, Earth and Environmental Sciences, UNSW Sydney, Sydney, 2052, Australia (CTC) Houston Museum of Natural Science, Department of Vertebrate Zoology, 5555 Hermann Park Drive, Houston, TX 77030-1799 (DMB) *Correspondent: [email protected] ABSTRACT—We summarize the history, current distribution, and status of Egyptian geese (Alopochen aegyptiaca) in the contiguous United States, using published records and the eBird database of bird observations. The area of occupancy for the Egyptian goose has increased throughout the contiguous United States. The species has three populations that appear to be strongholds throughout the United States: Florida, California, and Texas. The potential ecological and economic consequences of an apparent increase in the United States warrant further research on a number of aspects of Egyptian goose biology. RESUMEN—Resumimos la historia, la distribuci´on actual y el estado de los gansos del nilo Alopochen aegyptiaca en los estados contiguos de los Estados Unidos, utilizando registros publicados y las observaciones de aves de la base de datos eBird. El territorio ocupado por el ganso del nilo ha aumentado en los estados contiguos de los Estados Unidos. La especie tiene tres poblaciones que parecen ser bastiones en los Estados Unidos: Florida, California y Texas. Las posibles consecuencias ecol´ogicas y econ´omicas del aumento del numero´ de gansos en los Estados Unidos merecen m´as investigaci´on en varios aspectos de la biolog´ıa del ganso del nilo. The Egyptian goose (Alopochen aegyptiaca) is native to specimens, but the birds were most likely escapees (Baird Africa (Brown et al., 1982; Maclean, 1988; Davies, 2005), et al., 1884; American Ornithologists’ Union, 1901). where it is common and widespread south of the Sahara Phillips (1928) commented that the Egyptian goose was (Maclean, 1997). Egyptian geese are naturalized in commonly kept and that many were imported since 1904 Europe (Sutherland and Allport, 1991; Delany, 1993; (our emphasis). The birds remained common in avicul- Lensink, 1999; Rehfisch et al., 2010; Gyimesi and Lensink, tural collections and likely accounted for various records 2012) and are considered one of the most rapidly throughout North America (Wilbur and Yocom, 1971). spreading invasive species there (Gyimesi and Lensink, Breeding outside of captivity was first reported from 2012). In the United States, Egyptian geese occur California in 1967 (Renwick, 1968). This was followed by regularly in Florida, Texas, and California, among other breeding in Florida in 1985 (Pranty and Ponzo, 2014) and states (Braun, 2004; Pranty and Garrett, 2011; Pranty and Arkansas in 2008 (Smith and James, 2012). There now Ponzo, 2014; Callaghan and Brooks, 2016; eBird, 2016). appear to be established populations in Florida, Califor- Although population biology of the Egyptian goose has nia, Texas, and possibly Arkansas. Recent published been described at the local level (e.g., Pranty and Ponzo, information on Egyptian geese in North America is 2014; Callaghan and Brooks, 2016), state and especially limited to the status and distribution of populations in nationwide analyses are lacking. In this note, we collate Arkansas (Smith and James, 2012; Chesbro, 2015), historical information and use eBird data (Sullivan et al., Florida (Pranty and Ponzo, 2014), California (Pranty 2014) to present current distribution and current trends and Garrett, 2011), and Texas (Callaghan and Brooks, of Egyptian geese in the contiguous United States. The 2016). purpose of this note is to draw attention to an introduced We used the eBird database (Sullivan et al., 2014) in species in North America that is demonstrating an order to summarize the current distribution and status of exceptional increase, especially in recent years. the Egyptian goose in North America. Given the unique Akhurst (1877) and Kirkwood (1900) provide the look of Egyptian geese compared with other North earliest known records of Egyptian geese in North American avifauna, there is little reason to believe that America. Both authors believed the records to be of wild misidentifications would skew results. All Egyptian goose December 2017 Notes 297 FIG. 1—The current distribution of the Egyptian goose throughout the continental United States. Maps are made using Program R statistical software, eBird data from January 2016 to December 2016 (N = 2,221 observations). Each eBird occurrence during this time frame is plotted, using a ‘‘jitter’’ approach, which introduces a small amount of variation to the points to avoid overplotting. The circle represents the ‘‘jittering.’’ Minimal transparency indicates minimal points plotted on top of each other, while the darker areas indicate many points plotted on top of each other. records in the eBird database were included, whether ArcMap v10.2 (Environmental Systems Research Institute, they were validated or invalidated by reviewers. We Redlands, California), to calculate the area of occupancy acknowledge that observers might not submit exotic bird (International Union for Conservation of Nature, 2001; sightings at the same frequency in which they submit Klemann and Vieira, 2013) of Egyptian geese throughout native avifauna records, but unless there are statewide or the contiguous United States. We calculated the area of regional reporting biases, this only biases our analyses in a occupancy by overlaying eBird observations on a grid, conservative manner. counted the grid cells in which at least one observation We investigated Egyptian goose records in the eBird took place on an annual basis, and summed these, which database between January 2016 and December 2016 (N = provided a value in square kilometers per year. We used a 2,221 observations; 95% validated), and plotted these to 10-km2 cell size, given the capable flight ability of visualize the current distribution of Egyptian geese in the Egyptian geese and in order to ensure the same individual contiguous United States (Fig. 1). The 1-year date range geese were not being counted multiple times. To account helped to minimize the role escapees would have on the for increasing effort of the eBird database, we standard- current distribution. The species has three populations ized eBird data by dividing the area of occupancy in a that appear to be strongholds throughout North America: given year by the number of checklists submitted in that Florida, California, and Texas. Overall, the most records year, for each respective location (i.e., United States, (42%, 35%, and 20%, respectively) in the eBird database Florida, California, Texas). The trends make this species originate from these three states (Table 1). There are a worthy of future investigations because they demonstrate number of records in the northeastern United States that a substantial increase in the area of occupancy of likely represent isolated escapees. There are records from Egyptian geese (Fig. 2) throughout the contiguous a number of other states (Table 1), but questions of United States, and especially Texas, where there appears provenance surround many of these birds. We speculate to be the greatest rate of spread. that records within the southeastern United States could Egyptian geese are one of the most rapidly spreading represent dispersing individuals from the Florida popu- invasive species in Europe and are considered a signifi- lation; however, based on the database used, it is difficult cant problem, in several ways (Lensink, 1998; Gyimesi and to surmise. Table 1 represents the number of records (i.e., Lensink, 2012). They have been documented hybridizing occurrence—observation of an Egyptian goose, regardless with other waterfowl (Lensink, 1996; Harrop, 1998; Banks of abundance) for each state between 2006 and 2016 in et al., 2008; Callaghan and Brooks, 2016); have had a the eBird database. There were 17,447 observations in the negative effect on black sparrowhawk (Accipiter melanoleu-
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