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首页> 外文期刊>Waterbirds >Development of a Survey Protocol for Monitoring Reddish Egrets (&ITEgretta rufescens&IT) in Florida, USA
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Development of a Survey Protocol for Monitoring Reddish Egrets (&ITEgretta rufescens&IT) in Florida, USA

机译：在美国佛罗里达州监测Reddish白鹭（＆amp; rufescens＆amp; IT）的调查协议的制定

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摘要

The Reddish Egret (Egretta rufescens) is North America's rarest heron, and roughly 10% of its population resides in Florida. Its dark plumage, subcanopy nesting, and rarity make it difficult to count with aerial surveys, and assessments of ground- and boat-based methods for estimating the abundance of nesting pairs at breeding sites in Florida are lacking. The efficacy of flight-line surveys (boat-based counts of adults flying to and from colonies) and direct counts (ground- or boat-based counts of nests) were compared using data collected by multiple observers during repeated visits to 16 Reddish Egret colonies in three core breeding areas in the State of Florida, USA. Detection rates on direct counts were 77% for a single observer and 89% for two observers combined. Variance between repeated flight-line surveys was high (61% ) for 1-hr surveys but substantially lower for 2-hr (18%) and 3-hr (14%) surveys. Estimated nest counts from flight-line surveys were substantially greater than those produced during direct counts, with mean differences of 85% for 1-hr counts, 134% for 2-hr counts, and 133% for 3-hr counts. Overestimates from flight-line surveys may be related to factors that can be mitigated by avoidance of sites for which use of the method is likely inappropriate (e.g., where breeding is substantially asynchronous or when a site includes an interior foraging lagoon). Survey recommendations are presented for monitoring the Reddish Egret on a large spatial scale.
机译：红白白鹭（EGRETTA RUFESCENS）是北美最稀有的苍鹭，大约10％的人口居住在佛罗里达州。它的暗羽羽毛，细分嵌套和罕见使得缺乏空中调查，缺乏基于空中调查的评估，缺乏基于地面和船舶的饮食网站嵌套对的方法。使用多个观察者在重复访问期间对16个Reddish白鹭殖民地进行的数据进行比较在美国佛罗里达州的三个核心育种区。单个观察者的直接计数的检测率为77％，两个观察者组合的89％。重复的飞行线调查之间的差异高（61％），对于1-HR调查，但2-HR（18％）和3-HR（14％）调查显着降低。从飞行线测量的估计巢计数大于直接计数的巢数量大于那些产生的，1小时计数的平均差异为85％，2-HR计数为134％，3小时计数为133％。来自飞行线调查的高估可能与可以通过避免使用该方法的站点来减轻的因素有关，该方法可能是不合适的（例如，其中繁殖基本上是异步的或当网站包括内部觅食泻湖时）。提出了调查建议，用于监测大型空间规模的红白鹭。

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  • 来源
    《Waterbirds》 |2017年第4期|共10页
  • 作者

    Cox W. Andrew; Sghwarzer Amy; Kiltie Richard; Paul Ann; Rachal Mark; Kent Gina M.; Meyer Kenneth D.; Lorenz Jerome J.; Frezza Peter E.; Rafferiy Heather; Roebling Suzy;

  • 作者单位

    Florida Fish &

    Wildlife Conservat Commiss Fish &

    Wildlife Res Inst 1105 SW Williston Rd Gainesville FL 32601 USA;

    Florida Fish &

    Wildlife Conservat Commiss Fish &

    Wildlife Res Inst 1105 SW Williston Rd Gainesville FL 32601 USA;

    Florida Fish &

    Wildlife Conservat Commiss Fish &

    Wildlife Res Inst 1105 SW Williston Rd Gainesville FL 32601 USA;

    Audubon Florida Florida Coastal Isl Sanctuaries 410 Ware Blvd 702 Tampa FL 33619 USA;

    Audubon Florida Florida Coastal Isl Sanctuaries 410 Ware Blvd 702 Tampa FL 33619 USA;

    Avian Res &

    Conservat Inst 411 NE 7th St Gainesville FL 32601 USA;

    Avian Res &

    Conservat Inst 411 NE 7th St Gainesville FL 32601 USA;

    Audubon Florida Everglades Sci Ctr 115 Indian Mound Trail Tavernier FL 33070 USA;

    Audubon Florida Everglades Sci Ctr 115 Indian Mound Trail Tavernier FL 33070 USA;

    Audubon Florida Everglades Sci Ctr 115 Indian Mound Trail Tavernier FL 33070 USA;

    Audubon Florida Everglades Sci Ctr 115 Indian Mound Trail Tavernier FL 33070 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 动物学;
  • 关键词

    breeding synchrony; Egretta rufescens; Florida; population estimation; Reddish Egret;

    机译：繁殖同步;egretta rufescens;佛罗里达州;人口估计;红白鹭;

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