Great Salt Lake, Utah, USA, is a critical staging area for Wilson's (Phalaropus tricolor) and red‐necked (Phalaropus lobatus) phalaropes. Both phalarope species depend upon abundant invertebrate prey in Great Salt Lake to fuel fall migrations, but the lake currently faces the threat of becoming increasingly saline due to water diversions and climate change. The lake changes may decrease the ability of Great Salt Lake to support the large populations of phalaropes that currently depend upon it. Assessing how a smaller and more saline Great Salt Lake will affect phalaropes is difficult without knowing what phalaropes are consuming during staging. We collected phalaropes from 4 different Great Salt Lake bays from 2012 through 2015 and identified prey items in their upper digestive tracts. We measured wet weights of different food items and examined total mass of food consumed by weighing gizzard contents. Phalarope diets differed across time and bays, and between phalarope species. Red‐necked phalaropes primarily consumed corixids (Corixidae) and brine fly (Ephydra hians, Ephydra cinerea) larva, pupa, and adults, whereas Wilson's phalaropes consumed brine flies, chironomids (Chironomidae) and Daphnia (Daphnia magna). Despite the abundance of brine shrimp (Artemia franciscana) in Great Salt Lake, both phalarope species rarely consumed them. Our results documented that phalaropes of Great Salt Lake are dependent for food in the less‐saline Farmington Bay and on brine flies produced in the hypersaline bays. Such information is critical for wildlife managers who are tasked with ensuring that Great Salt Lake will continue to support the large phalarope populations that depend on the lake's resources. © 2021 The Wildlife Society.

中文翻译：

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大盐湖，犹他州分期节肢动物的饮食

美国犹他州的大盐湖，是威尔逊（Phalaropus tricolor）和红颈（Phalaropus lobatus）的重要栖息地）趾骨。这两种袋鼠都依靠大盐湖中大量的无脊椎动物捕食来推动秋天的迁徙，但是由于水的转移和气候变化，该湖目前面临着盐分增加的威胁。湖泊的变化可能会降低大盐湖支撑目前依赖它的大量指骨的能力。在不知道分期过程中消耗食指鱼的情况下，很难评估盐分更大，盐度更大的大盐湖将如何影响食指鱼。我们从2012年到2015年从4个不同的大盐湖湾中收集了指骨节，并在它们的上消化道中发现了猎物。我们测量了不同食品的湿重，并通过称量g含量来检查所食用食品的总质量。袋鼠的饮食随着时间和海湾的不同而不同，和袋鼠物种之间。红颈的趾甲主要消耗科立克体（Corixidae）和盐水飞蝇（hydr，幼虫，和成虫，而威尔逊的食指鱼则食盐水蝇，猫科动物（Chironomidae）和水蚤（Daphnia magna）。尽管大盐湖中有大量虾类（卤虫），但两种袋鼠物种都很少食用它们。我们的研究结果表明，大盐湖的趾骨依赖于盐度较低的法明顿湾的食物和高盐度海湾中产生的卤水蝇。这些信息对于负责确保大盐湖将继续支持依赖该湖资源的大量法老植物种群的野生动植物管理者而言至关重要。©2021野生动物协会。