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Conservation Status of the Buff-Breasted Sandpiper: Historic and Contemporary Distribution and Abundance in South America

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Conservation Status of the Buff-Breasted Sandpiper: Historic and Contemporary Distribution and Abundance in South America Wilson Bull., 114(1), 2002, pp. 44±72 CONSERVATION STATUS OF THE BUFF-BREASTED SANDPIPER: HISTORIC AND CONTEMPORARY DISTRIBUTION AND ABUNDANCE IN SOUTH AMERICA RICHARD B. LANCTOT,1,10,12 DANIEL E. BLANCO,2 RAFAEL A. DIAS,3 JUAN P. ISACCH,4 VERENA A. GILL,1 JULIANA B. ALMEIDA,5 KASPAR DELHEY,6,11 PABLO F. PETRACCI,7 GLAYSON A. BENCKE,8 AND RODRIGO A. BALBUENO9 ABSTRACT.ÐWe present historic and contemporary information on the distribution and abundance of Buff- breasted Sandpipers (Tryngites subru®collis) in South America. Historic information was collated from the literature, area ornithologists, and museums, whereas contemporary data were derived from surveys conducted throughout the main wintering range in Argentina, Uruguay, and Brazil during the austral summers of 1999 and 2001. Variable circular plot sampling was used to estimate population densities. During 1999, the highest concentration of Buff- breasted Sandpipers in Argentina was in southern BahõÂa SamboromboÂn (General Lavalle District) and areas north of Mar Chiquita coastal lagoon. During 2001, the highest concentrations in Brazil were at Ilha da Torotama and Lagoa do Peixe National Park. During 1999 and 2001, the highest concentrations of Buff-breasted Sandpipers in Uruguay were found along three lagoons (Laguna de Rocha, Laguna de Castillos, and Laguna GarzoÂn) bordering the Atlantic Ocean. Population densities (birds/ha) of Buff-breasted Sandpipers were 0.11 (95% C.I. 5 0.04±0.31) in Argentina, 1.62 (0.67±3.93) in Brazil, and 1.08 (0.37±3.18) in Uruguay. High turnover rates at survey sites, due to the formation of large, mobile ¯ocks, contributed to moderately large con®dence intervals around our population density estimates. Nevertheless, compared with historic accounts of Buff-breasted Sandpipers, our survey data indicate the population size of this species has declined substantially since the late 1800s and contemporary information suggests the species has continued to decline during the past three decades. Buff-breasted Sandpipers were found almost exclusively in pasturelands and appear to depend heavily upon intensive grazing by livestock, which maintain suitable short grass conditions. We discuss the need for protection of critical areas and proper range management to ensure appropriate habitat remains available for the species, and provide suggestions for future research needs. Received 12 March 2001, accepted 31 January 2002. Buff-breasted Sandpipers (Tryngites sub- gration across the central United States and to ru®collis) probably numbered in the hundreds a lesser degree on the wintering grounds in of thousands at the turn of the Twentieth Cen- South America (McIlhenny 1943, Myers tury (Forbush 1912, Hudson 1920). Long term 1980, Canevari and Blanco 1994). A further shorebird surveys in central and eastern Can- negative effect on the population occurred ada indicate that the population size may be during the widespread conversion of short as low as 15,000 today (Brown et al. 2001, grass prairies to agriculture in the U.S. plains Morrison et al. 2001). This decline is attri- (Wetmore 1927, Lanctot and Laredo 1994). In buted to commercial hunting during the late 1999, the Buff-breasted Sandpiper was pro- 1800s and early 1900s during the species' mi- posed and then included in Appendix I of the 1 USGS Alaska Science Center, 1011 East Tudor 7 Patricios 712, (8000), BahõÂa Blanca, Argentina. Rd., Anchorage, AK 99503, USA. 8 Museu de CieÃncias Naturais, FundacËaÄo ZoobotaÃn- 2 Wetlands International, 25 de Mayo 108 G, (1002) ica do Rio Grande do Sul, C.P. 1188, 90001-970, Porto Buenos Aires, Argentina. Alegre, RS, Brazil. 3 Museu de HistoÂria Natural, Univ. CatoÂlica de Pe- 9 Biolaw Consultoria Ambiental, Rua Jose do Patro- lotas, C.P. 402, R. FeÂlix da Cunha, 412, 96010-000, cõÂnio, 548±Conj. 201, CEP 90050-002, Porto Alegre, Pelotas, RS, Brazil. RS, Brazil. 4 Dep. de BiologõÂa, Facultad de Ciencias Exactas y 10 Current address: USFWS Migratory Bird Manage- Naturales, Univ. Nacional de Mar del Plata, Funes ment, 1011 East Tudor Rd., Anchorage, AK 99503, USA. 3250, (7600) Mar del Plata, Argentina. 11 Current address: Max Planck Research Centre for 5 Ecology, Evolution and Conservation Biology Pro- Ornithology, Seewiesen, P.O. Box 1564, D-82305 gram/314, Univ. of Nevada Reno, Reno, NV 89557, Starnberg, Germany. USA. 12 Corresponding author; E-mail: 6 QuilleÂn 75, (8000), BahõÂa Blanca, Argentina. [email protected] 44 Lanctot et al. x WINTERING BUFF-BREASTED SANDPIPERS 45 Convention on the Conservation of Migratory onto base maps with ArcView GIS software (Environ- Species of Wild AnimalsÐUnited Nations mental Systems Research Institute, Inc. 1992). Infor- Environmental Program (1999). The species mation was obtained from published and grey litera- ture, by local contacts and ornithology list servers, and also is ranked as one of high concern in the from museums. When geographic coordinates for a lo- U.S. (Brown et al. 2001) and Canadian (Don- cation were not provided in the primary source of in- aldson et al. 2000) shorebird conservation formation (person or reference), we found locations plans. These certi®cations encourage the and determined coordinates from ornithological gaz- study, management, and conservation of the etteers available for each country. We also used the species. spelling of place names in the gazetteers when avail- able. We de®ned the main wintering and migration Within this framework, we conducted the range of the species based on the distribution and tim- ®rst population wide survey of the species. ing of these observations, previous knowledge of the The natural history of the Buff-breasted Sand- species' habitat use (Blanco et al. 1993), and the dis- piper required that such a survey be conducted tribution of habitat types in the RõÂo de La Plata Grass- on the wintering grounds. During the breeding lands (see maps in LeoÂn et al. 1984, Soriano 1991). season, individuals occur sporadically and in The main wintering range encompassed the area where unpredictable numbers throughout the high Buff-breasted Sandpipers were observed frequently and in large numbers during austral summer months Arctic (Troy and Wickliffe 1990, Lanctot and (November through February), and where there were Laredo 1994, Lanctot and Weatherhead 1997). large patches of suitable habitat. Buff-breasted Sand- Similarly, Buff-breasted Sandpipers are pipers occasionally occur outside this area during win- broadly dispersed and are unpredictable in ter although suitable habitat is patchily distributed and distribution during spring and fall migration scarce (due to agriculture and urban development), in the central plains of the U.S. and Canada making sightings unpredictable and infrequent. The migration range spanned the area where sightings were (Skagen 1997; J. G. Strauch, Jr. unpubl. data). recorded during austral spring (August through Octo- In contrast, Buff-breasted Sandpipers winter ber) and fall migration (March through May), or areas in a relatively small region of Argentina, Uru- visited only occasionally by the species. Although only guay, and Brazil (Belton 1994, Blanco et al. historic observations were used to delineate the migra- 1993, Lanctot and Laredo 1994). Here, they tion and wintering areas, we included more recent ob- are restricted to coastal areas that provide a servations in our tables and ®gures as they provided sanctuary for the species because ¯ooding and additional contemporary information on the species. Historic observations where the month of the sighting soil salinity limit agricultural development was missing (7 of 133 localities) were not used to de- and promote cattle grazing (Soriano 1991). lineate winter and migration boundaries. Buff-breasted Sandpipers, in turn, bene®t Survey design and protocol.ÐWe conducted surveys from cattle grazing because of their depen- during early December, 1999, in Argentina and Uru- dence upon short grass pastures for winter guay. After learning that Buff-breasted Sandpipers also habitat. were using portions of Brazil, we initiated a second Here we present historical and contempo- year of surveys in early December 2001. These sur- veys were limited to only Uruguay and Brazil because rary information on the abundance and distri- funds were limited. bution of Buff-breasted Sandpipers in South Because all the available literature indicated Buff- America. Next, we document the abundance breasted Sandpipers used land with short vegetation, and locations where Buff-breasted Sandpipers we focused our surveys on short-vegetated areas such were seen during systematic surveys in Ar- as intensively grazed pastures and newly established gentina, Uruguay, and Brazil during the aus- agricultural ®elds (e.g., rice ®elds). Here, pastures typ- ically refer to native grass areas or old agricultural tral summers of 1999 and 2001. Then, we dis- ®elds with crop residue that are being grazed. Tall cuss the need for protection of critical areas grass, tall emergent areas of marshes, and forested ar- and proper range management to ensure ap- eas were avoided. Survey localities were restricted fur- propriate habitat remains available for the spe- ther to those areas that we could access by road or cies. Finally, we recommend future research ranch trails, or by travel with 4-wheel drive vehicles. needs for the conservation of the species. In Argentina, we focused our surveys on a random sample of sites within the previously de®ned main wintering range (with an emphasis on the less-devel- METHODS oped coastal areas; see Buff-breasted Sandpiper habitat Wintering and migration range.ÐWe delineated the use in Blanco et al. 1993). We delineated survey plots potential wintering range of Buff-breasted Sandpipers by drawing a grid over the map of the main wintering by plotting the locations of historic species records range. Each plot was approximately 12 3 12 km in 46 THE WILSON BULLETIN x Vol. 114, No. 1, March 2002 size. Upon visiting each plot, observers selected a spe- m of a point) after we had initiated counting; it simply ci®c ``locality'' to survey based on habitat suitability.
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