Conservation status of the Buff-breasted Sandpiper: Historic and contemporary distribution and abundance in South America
Conservation status of the Buff-breasted Sandpiper: Historic and contemporary distribution and abundance in South America
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DOI：
10.1676/0043-5643(2002)114
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发表时间：
2002-03-01
期刊：
影响因子：
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通讯作者：
Balbueno, RA
中科院分区：
文献类型：
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作者：
Lanctot, RB;Blanco, DE;Balbueno, RA
我们提供有关南美洲浅胸鹬 (Tryngites subruficollis) 分布和数量的历史和当代信息。历史信息来自文献、地区鸟类学家和博物馆，而当代数据则来自 1999 年和 2001 年南半球夏季期间在阿根廷、乌拉圭和巴西的主要越冬范围内进行的调查。使用可变圆形样地抽样来估计种群密度。 1999年，阿根廷浅胸鹬最集中的地区是Bahia Samborombon南部（拉瓦勒将军区）和Mar Chiquita沿海泻湖以北的地区。 2001 年，巴西的浓度最高的是托罗塔马岛 (Ilha da Torotama) 和佩克斯湖国家公园 (Lagoa do Peixe National Park)。 1999年和2001年期间，乌拉圭在大西洋沿岸的三个泻湖（拉古纳德罗查、拉古纳德卡斯蒂略斯和拉古纳加尔松）发现了黄胸鹬的最高浓度。阿根廷浅胸鹬的种群密度（鸟/公顷）为 0.11（95% C.I. = 0.04-0.31），巴西为 1.62（0.67-3.93），乌拉圭为 1.08（0.37-3.18）。由于形成大量流动群体，调查地点的高周转率导致我们的人口密度估计值的置信区间较大。然而，与黄胸鹬的历史记录相比，我们的调查数据表明该物种的种群规模自 1800 年代末以来已大幅下降，而当代信息表明该物种在过去三十年中持续下降。浅胸鹬几乎只在牧场上发现，似乎严重依赖牲畜的密集放牧，从而维持了合适的短草条件。我们讨论了保护关键区域和适当范围管理的必要性，以确保为该物种保留适当的栖息地，并为未来的研究需求提供建议。
We present historic and contemporary information on the distribution and abundance of Buff-breasted Sandpipers (Tryngites subruficollis) 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 Bahia Samborombon (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 Garzon) bordering the Atlantic Ocean. Population densities (birds/ha) of Buff-breasted Sandpipers were 0.11 (95% C.I. = 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 flocks, contributed to moderately large confidence 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.