Adrian E. Andrei

Texas Tech University, Lubbock, TX, United States

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Publications (4)4.58 Total impact

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    ABSTRACT: Abstract Shorebirds migrating through the Southern Great Plains of North America use saline lakes as stopovers to rest and replenish energy reserves. To understand how availability of invertebrates, salinity, freshwater springs, vegetation, and water influence the value of saline lakes as migration stopovers, we compared lakes used and not used by migrant shorebirds. Shorebirds used lakes that had freshwater springs, mudflats and standing water, sparse vegetation (≤1% cover), low to moderate salinities (x = 30.87 g/L), and mean invertebrate biomass of 0.79 g/m2. Lakes that were not used were generally dry or had hypersaline water (x = 82.56 g/L), lacked flowing springs and vegetation, and had few or no invertebrates (x = 0.007 g/m2). Our results suggest that reduced spring flows and increased salinity negatively affect availability of shorebird habitats and aquatic invertebrates. We recommend preservation of the freshwater springs discharging in the saline lakes. Because the springs are discharged from the Ogallala aquifer, which is recharged through the playa wetlands, the entire complex of wetlands in the Great Plains and the Ogallala aquifer should be managed as an integral system.
    Journal of Wildlife Management 12/2010; 72(1):246 - 253. · 1.64 Impact Factor
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    ABSTRACT: We recorded and compared diurnal and nocturnal time-activity budgets of American Avocet (Recurvirostra americana), Lesser Yellowlegs (Tringa flavipes), Least Sandpiper (Calidris minutilla), and Wilson’s Phalarope (Phalaropus tricolor) on 21 saline lakes in the Southern Great Plains, USA, during spring and summer/fall 2002 and 2003 to examine importance of saline lakes as migratory stopover sites. All four species spent most of their time feeding (47-70%) and resting (7-37%) by day and at night during spring and fall migrations. Little time was spent in other behaviors. Time budgets differed among species and between seasons, likely due to different energy needs. Time spent foraging varied seasonally between saline lakes and freshwater playas for American Avocets and Least Sandpipers, likely due to differences in vegetation cover and availability of prey between these wetland types. For most species, time spent foraging and resting differed between day and night. Therefore, extrapolating diurnal activity budgets to the entire 24-hour period and from one type of habitat to another within the same region is not recommended. Saline lakes are used by migrant shorebirds as stopover sites where they replenish lipid stores. Conservation efforts should focus on preserving these unique wetlands and the freshwater springs that discharge in them.
    Waterbirds 01/2009; · 0.92 Impact Factor
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    ABSTRACT: Tens of thousands of shorebirds use saline lakes as migratory stopovers in the Southern Great Plains, USA. To assess their foraging strategies and understand how they replenish energy reserves during spring and summer/fall migrations, we examined diets, prey taxa selection, and prey size selection of American Avocets (Recurvirostra americana), Least Sandpipers (Calidris minutilla), Wilson's Phalaropes (Phalaropus tricolor), and Lesser Yellowlegs (Tringa flavipes). Migrant shorebirds foraged opportunistically by taking most prey taxa according to their availability. Least Sandpipers preferred small prey (2–5 mm), whereas American Avocet, Wilson's Phalaropes, and Lesser Yellowlegs generally preferred intermediate and large prey (6–20 mm). By consuming prey taxa according to their availability and prey sizes that require minimum energy to capture and ingest, shorebirds increase their ability to replenish energy reserves while migrating through interior North America. Drought and drying of freshwater springs will reduce availability of prey in saline lakes for migrating shorebirds. To preserve the saline lakes as important habitats where shorebirds replenish nutrient reserves while migrating through the Great Plains, it is important to conserve groundwater so that freshwater springs continue to discharge into the lakes
    Waterbirds 01/2009; 32(1):138-148. · 0.92 Impact Factor
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    ABSTRACT: ABSTRACT Shorebirds migrating through the Southern Great Plains (SGP), USA, use freshwater playas and saline lakes as stopovers. The importance of playas is well documented, but the role of saline lakes is not clearly understood. During 2002 and 2003, we conducted surveys to determine the extent to which the saline lakes serve as stopovers. Twenty-eight species were recorded, and total seasonal abundance ranged from 6779 to 29,924 birds. Potential shorebird abundance for extant saline lakes was estimated at 37,000–71,000 shorebirds annually. American Avocets (Recurvirostra americana), Western Sandpipers (Calidris mauri), Baird's Sandpipers (C. bairdi), Least Sandpipers (C. minutilla), Snowy Plovers (Charadrius alexandrinus), Killdeer (Charadrius vociferus), and Wilson's Phalaropes (Phalaropus tricolor) were the most abundant species. Community composition of shorebirds differed between saline lakes and regional freshwater playas. Peak spring abundance was generally in April, whereas summer/fall migration was more protracted and shorebird abundance peaked during 6–8 weeks in August and September. Migration chronologies differed among morphologically similar species, and among representative species from different guilds. Such patterns of temporal separation permit partitioning of resources by shorebirds migrating through the SGP. The saline lakes of the SGP should be regarded as stopover sites of regional and international value. To ensure that saline lakes function as stopovers and to help maintain those unique communities that inhabit them, conservation of saline lakes should focus on preserving spring flows and conserving water.SINOPSISLos playeros que migran a través de las grandes planicies del sur de los Estados Unidos, utilizan como lugares de parada playas de agua fresca y lagos salobres. La importancia de las playas ha sido muy bien documentada, pero no se entiende bien el rol que puedan tener los lagos salobres. Durante el 2002 y el 2003, realizamos trabajos para determinar hasta que punto los lagos salobres servían como lugares importantes de parada. En estos, enontramos la presencia de 28 especies y una abundancia que varía entre 6779 y 29,924 aves. El uso potencial de estos lagos salinos es de 37,000 a 71,000 individuos. Las especies más abundantes en este tipo de habitat resultaron ser Recurvirostra americana, Caladris mauri, C. bairdi, C. minutilla, Charadrius alexandrinus y Phalaropus tricolor. La composición de playeros resultó ser diferente en las playas de agua fresca y en los lagos salobres. El pico en la abundancia durante la primavera, se llevó a cabo generalmente en Abril, mientras que el pico de los migrantes de verano/otoño ocurrió por un periodo de 6–8 semanas de agosto a septiembre. La cronología migratoria tiene sus diferencias entre especies de morfología similar, al igual que en especies de otros grupos. Este patrón de separación temporera, permite la repartición de recursos entre las aves que migran a través de las grandes planicies. Los lagos salobres en dicha área deben ser considerados como lugares de paradas de gran importancia a nivel nacional e internacional. Para asegurar que dichos lagos salobres mantengan su función como lugares de paradas, la conservación de los mismos debe enfocar el preservar el flujo de agua a estos durante la primavera.
    Journal of Field Ornithology 11/2006; 77(4):372 - 383. · 1.10 Impact Factor