首页> 美国政府科技报告 >Final Report: Surveys and Investigations Projects as Required by Federal Aid inWildlife Restoration Act, Missouri. Study No. 19. Least Tern Investigations. Job No. 1. Interior Least Tern Foraging Ecology in the Mississippi River Basin

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Final Report: Surveys and Investigations Projects as Required by Federal Aid inWildlife Restoration Act, Missouri. Study No. 19. Least Tern Investigations. Job No. 1. Interior Least Tern Foraging Ecology in the Mississippi River Basin

机译：最终报告：密苏里州野生动物恢复法联邦援助所要求的调查和调查项目。研究第19号。最少Tern调查。第1号工作。密西西比河流域内陆最近的Tern觅食生态

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The authors investigated least tern (Sterna antillarum athalassos) foragingbehavior on the Lower Mississippi River in habitats surrounding sand island nesting colonies during the nesting seasons of 1993-95. We observed strong yearly difference in habitat use and foraging behavior. Deep-water habitats were used predominately in 1993, while shallow habitats were more heavily used in 1994 and both habitats were used almost equally in 1995. We observed the highest capture rates, foraging efficiencies, activity rates and dive rates during 1995, followed by 1994 with the lowest in 1993. Stage of reproduction was an important source of variation to some goraging variables in some years, and the typical pattern suggest that foraging rates decline during incubation. Our study suggests that the predator-prey relationship between least terns and small riverine fish is complex and not easily understood. The large amount of variation in tern foraging behavior between and among years is most likely closely related to hydrologic cycles on the river. Hydrology was highly variable during the course of this study. Other factors that may be complicating our understanding of this system include density-dependent effects of terns on their prey base and the effects of predator avoidance responses of small fish in some habitats.

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作者
Renken, R. B.; Dugger, K.;
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年度 1996
页码 p.1-40
总页数 40
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Birds; Waterfowl; Terns; Missouri; Mississippi River Basin; Habitats; Foodchains(Ecology); Fishes;

机译：鸟类;水禽;燕鸥;密苏里州;密西西比河流域;栖息地;食物链（生态学）;鱼类;

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1. Final Report, Surveys and Investigations Projects, Federal Aid in Wildlife Restoration Act Illinois, Federal Aid Project No. W-99-R-7, Study XII: Raccoon Investigations, Job no. 5: Cooperative Raccoon Collections [O] . Sanderson Glen C. 1995

机译：最终报告，调查和调查项目，伊利诺伊州野生动物恢复法联邦援助项目，联邦援助项目编号W-99-R-7，研究十二：浣熊调查，工作号码。 5：合作浣熊收藏
2. Final Report Surveys and Investigations Projects as Required by Federal Aid inWildlife Restoration Act Missouri Federal Aid Project No. W-13-R-55 (2001). Study No. 53: River Otter Food Habits in Missouri. Job No. 2: Identification of Fish Species Found in [R] . Hamilton, D. A., Koppelman, J. 2001

机译：联邦援助项目联邦援助项目密苏里州联邦援助项目编号W-13-R-55（2001年）要求的最终报告调查和调查项目。研究第53号：密苏里州的水獭食物习惯。第2号工作：发现的鱼类物种鉴定

Final Report: Surveys and Investigations Projects as Required by Federal Aid inWildlife Restoration Act, Missouri. Study No. 19. Least Tern Investigations. Job No. 1. Interior Least Tern Foraging Ecology in the Mississippi River Basin

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