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首页> 外文期刊>Wader study: the international journal of shorebird science >Shorebird use of western Hudson Bay near the Nelson River during migration, with a focus on the Red Knot
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Shorebird use of western Hudson Bay near the Nelson River during migration, with a focus on the Red Knot

机译：滨使用西方的哈德逊湾附近纳尔逊河在迁移过程中,关注的焦点红腹滨鹬

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Long-distance migratory shorebirds are vulnerable to stressors throughout their annual cycle, including during migration when they must rely on a limited set of stopover sites to refuel. The rufa subspecies of Red Knot Calidris canutus has shown drastic population declines in recent decades and is listed as Endangered in Canada and Threatened in the United States. Recent evidence from light-level geolocators suggested that the subspecies might use a previously unknown remote stopover site on the west coast of Hudson Bay near the Nelson River, but total numbers of knots using the area and the specific locations and habitats used were unknown. In spring 2014, we performed ground and aerial surveys of coastal areas surrounding the Nelson River to assess shorebird use and abundance. In addition, we used radio telemetry to investigate migratory connectivity between the Nelson River and an important stopover site at Delaware Bay, New Jersey. Red Knots were the second-most abundant species observed during ground surveys, and we counted a total of 4,259 knots during a two-day aerial survey, representing about 10% of the estimated rufa population. At least 16 knots with radio-tags out of 87 banded at Delaware Bay were detected near the Nelson River, suggesting strong migratory connectivity between the two stopover sites. Based on our observations of knots and other shorebirds, the site qualifies as an Important Bird Area (IBA) and Western Hemisphere Shorebird Reserve Network (WHSRN) site under several criteria. Understanding the potential impacts of threats in the area, including hydroelectric development on the Nelson River and overabundant Snow Geese Chen caerulescens caerulescens, is a critical next step in protecting the rufa subspecies from further declines.
机译：长途迁徙水鸟是脆弱的压力在他们的年度周期,包括在迁移时,他们必须依靠一组有限的中途停留加油。温泉亚种的红色结Calidris canutus显示最近人口急剧下降几十年来,在加拿大和被列为濒危物种在美国的威胁。从光级进行建议亚种可能使用一个前所未知的遥远中途站点西海岸的哈德逊湾纳尔逊河附近,但总数量的节使用区域和特定位置栖息地是未知的。地面和空中的调查沿海执行纳尔逊河评估周围地区滨使用和丰富。无线电遥测调查迁徙纳尔逊河和之间的连通性重要的网站停留在特拉华湾,新泽西岛。物种观察地面调查期间,我们在为期两天的数了一下,一共4259节空中的调查中,约占10%估计顾客的人口。研究者结合无线电标签追踪87联合在特拉华湾检测到纳尔逊河附近,表明强劲迁徙连接性之间的两个中途停留网站。其他水鸟,网站有资格作为一个重要的鸟类区域(IBA)和西半球滨储备网络(WHSRN)网站几个标准。影响该地区的威胁,包括纳尔逊河和水电开发过多的雪雁陈caerulescenscaerulescens,是一个至关重要的下一步从进一步保护温泉亚种下降。

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