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eBook details

• Title: Stomach Contents of Calidris Minutilla (Charadriiformes: Scolopacidae) Wintering at a Freshwater Reservoir in West-Central Texas (Report)
• Author : The Texas Journal of Science
• Release Date : January 01, 2009
• Genre: Engineering,Books,Professional & Technical,
• Pages : * pages
• Size : 191 KB

Description

Sandpipers (Charadriiformes: Scolopacidae) feed primarily on invertebrates (Skagen & Oman 1996). Shorebird diets consist primarily of polychaete and oligochaete worms (Schneider 1987; Davis 1996; Tsipoura & Burger 1999), amphipods (Wilson & Parker 1996; Shepherd & Boates 1999), horseshoe crab (Limulus polyphemus) eggs (Tsipoura & Burger 1999), and insects, especially dipterans (Schneider 1987; Alexander et al. 1996; Davis 1996). Few dietary studies have focused on sandpipers at inland sites (Alexander et al. 1996; Davis 1996), and all of these focused on migrating populations. Studies are needed to determine the dietary preferences of sandpipers wintering at inland sites in order to better understand why some individuals remain at more northern latitudes over winter, when populations of invertebrate prey are likely at their lowest levels of the year. It is of particular importance to determine whether shorebirds at inland sites are able to locate high quality food resources (easily captured and digested; predictable in occurrence) or must subsist on low quality food items (difficult to capture or digest; unpredictable occurrence). Furthermore, habitat heterogeneity is typically lower at inland, freshwater reservoirs (such as in this study) compared to coastal areas, and it is likely that prey diversity and potentially abundance is similarly poor relative to coastal regions. The purpose of this research was to determine the diet of wintering sandpipers at an inland freshwater reservoir. Least Sandpipers (Calidris minutilla) and Western Sandpipers (Calidris mauri) migrating along the Central Flyway (Smith et al. 1991; Neill 1992; Davis 1996; DeLeon 1996) winter in small numbers (100 individuals per flock with only one or two flocks observed on any given day) in west-central Texas (Tarter 1997; Kasner 1999). This paper reports analysis of stomach contents from wintering sandpipers collected at Twin Buttes Reservoir, Tom Green County, in west-central Texas.

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