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首页> 外文期刊>The wilson journal of ornithology >WEATHER AND PREY AVAILABILITY AFFECT THE TIMING OF FALL MIGRATION OF EARED GREBES (PODICEPS NIGRICOLLIS) FROM GREAT SALT LAKE
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WEATHER AND PREY AVAILABILITY AFFECT THE TIMING OF FALL MIGRATION OF EARED GREBES (PODICEPS NIGRICOLLIS) FROM GREAT SALT LAKE

机译：天气和猎物的可利用性会影响大盐湖大耳GRE（PODICEPS NIGRICOLLIS）的秋季迁徙时间

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摘要

Great Salt Lake (GSL) is a critical migratory stopover location for Eared Grebes (Podiceps nigricollis), but the factors influencing the timing of their fall migration have not previously been investigated. We used archived Doppler radar data to visualize the nocturnal departures of Eared Grebes from GSL over 16 years, from 1999 -2015. We used generalized linear models (GLMs) to examine interannual variability in the timing of migration of Eared Grebes in relation to prey availability and lake temperature, as well as variation in the nightly departure likelihoods of Eared Grebes in relation to weather. On average, Eared Grebes departed from GSL over a period of 31 days each year, with departures occurring on 17 of those days. We did not find any trend toward earlier departures over the years of the study. Departures typically began earlier in the year when densities of brine shrimp adults (Artemia franciscana) were higher than average, densities of brine shrimp cysts were lower than average, and lake temperatures were warmer than average. The span of migration departures was most strongly related to the day of first departure, with longer spans occurring in years w ith an earlier migration initiation day. We also found that likelihood of departure from GSL was greater on nights with high barometric pressure and low lake temperature. High barometric pressure was related to low wind speeds and low incidence of precipitation. We concluded that Eared Grebes depart when they have gained sufficient mass to successfully migrate rather than lingering at GSL for as long as possible, and that migration departure is most likely on nights with fair weather.
机译：大盐湖（GSL）是大耳bes（Podiceps nigricollis）的重要迁徙中转地点，但以前尚未研究影响其秋季迁徙时间的因素。我们使用已归档的多普勒雷达数据可视化了从1999年到2015年的16年中，Gear的“耳Gre”的夜间活动。我们使用广义线性模型（GLM）来检验耳Gre的迁徙时间与猎物可用性和湖泊温度相关的年际变化，以及耳Gre的夜间离开可能性与天气相关的变化。平均而言，Eared Grebes每年在31天内离开GSL，在其中的17天内离开。在研究的多年中，我们没有发现朝着更早离开的趋势。离开通常始于当年早些时候，成年盐水虾成年密度（法国大蓟），盐水虾囊肿的密度低于平均水平，湖水温度高于平均水平。迁移离开的时间跨度与首次离开的日期最密切相关，几年中发生的跨度越长，迁移开始的日期越早。我们还发现，在大气压高和湖温低的夜晚，离开GSL的可能性更大。大气压高与低风速和低降水量有关。我们得出的结论是，有耳的格里伯族人获得足够的质量以成功地迁移后便会离开，而不是在GSL上逗留尽可能长的时间，并且这些迁移最有可能在天气晴朗的夜晚离开。

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