Recent Declines in Apparent Survival and Survey Counts of Snowy Plovers Breeding in the Southern High Plains of Texas

Saalfeld, Sarah T.; Conway, Warren C.; Haukos, David A.; Johnson, William P.

doi:10.1676/12-017.1

Cited by 12 publications

(24 citation statements)

References 33 publications

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“…Worldwide shorebird populations have declined 70% in the last 40 years (NABCI 2016) and some regional populations of snowy plovers Charadrius nivosus on the Southern Great Plains (SGP) mirror these declines (Saalfeld et al 2013;Heath 2019). The Pacific coastal population of snowy plovers has been similarly, but perhaps more severely affected (Page et al 1991(Page et al , 2009, resulting in their listing as threatened in accordance with the Endangered Species Act (USFWS 1993).…”

Section: Introductionmentioning

confidence: 99%

“…The Pacific coastal population of snowy plovers has been similarly, but perhaps more severely affected (Page et al 1991(Page et al , 2009, resulting in their listing as threatened in accordance with the Endangered Species Act (USFWS 1993). Both western and SGP population declines are largely attributed to habitat degradation caused by vegetation encroachment (Winton et al 2000;USFWS 2007;Saalfeld et al 2012), disturbance (Wilson-Jacobs and Meslow 1984;Lafferty 2001;Page et al 2009;Hardy and Colwell 2012;Saalfeld et al 2013), increased rates of nest predation (Hardy and Colwell 2012;Saalfeld et al 2011Saalfeld et al , 2013, and loss of reliable sources of fresh surface water (Andrei et al 2009;Saalfeld et al 2012Saalfeld et al , 2013Heintzman et al 2017). Some success in slowing, or reversing, these declines has been observed among the Pacific coastal population due to predator management and efforts to mitigate disturbance (Lafferty et al 2006;Hardy and Colwell 2008;Mullin et al 2010).…”

Section: Introductionmentioning

confidence: 99%

“…The status of Salt Plains NWR as important stopover and breeding habitat for snowy plovers (Skagen et al 1999;Morrison et al 2006;Thomas et al 2012), combined with documented declines of other SGP populations (Saalfeld et al 2013;Heath 2019) and possible connectivity with other snowy plover populations in the United States (Heath 2019), accentuates the need to regularly monitor this potentially at-risk population more closely (Hensley et al 2014). Considering declines of neighboring snowy plover populations, and due to Salt Plains NWR's continental significance to breeding snowy plovers (Saalfeld et al 2013;Heath 2019), estimates of snowy plover abundance on the Refuge require consideration of known biases.…”

Section: Introductionmentioning

confidence: 99%

“…Several studies on the SGP calculated or assumed detection probabilities of inland snowy plovers (Morrison et al 2001(Morrison et al , 2006Pearson et al 2007, Brindock 2009Thomas et al 2012;Saalfeld et al 2013;Ellis et al 2014) but no studies have incorporated distance sampling to verify the species' detectability. We predicted high detectability of snowy plovers due to findings of multiple studies, and previous experience surveying for the species.…”

Section: Introductionmentioning

confidence: 99%

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Detectability and Abundance of Snowy Plovers at Salt Plains National Wildlife Refuge, Oklahoma

Heath‐Acre

Conway

Boal

et al. 2020

Journal of Fish and Wildlife Management

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In the past two decades, Salt Plains National Wildlife Refuge has been increasingly recognized as important habitat for both breeding and migratory shorebirds. North American snowy plovers Charadrius nivosus in particular rely on the nearly 5,000 ha salt flat at Salt Plains National Wildlife Refuge, which thousands use as breeding and stopover habitat. Elsewhere on the Southern Great Plains, decadal declines up to 75% within snowy plover subpopulations have been documented and attributed to vegetation encroachment, increased rates of nest predation, and decreased availability of fresh surface water. Despite many attempts to estimate this species’ abundance across the continent, to date, no known attempt at distance sampling of snowy plovers has occurred. To address this paucity of data, we assessed feasibility of distance sampling methods to accurately estimate snowy plover abundance and detectability. Distance sampling surveys (2017-2018) indicated high detection probability (P = 0.80) and the population abundance estimate across the salt flat extrapolated to 3,307 individuals. The distance sampling population abundance estimate is lower than population abundance estimates determined by two previous studies within the last decade but far greater than 2,105 estimated for a study in 2006. Overall, distance sampling snowy plovers at Salt Plains National Wildlife Refuge proved to be an effective addition to pre-established survey protocols but further investigation is needed to compare accuracy and precision of methods used in this study, annual surveys conducted by Salt Plains National Wildlife Refuge, and other potential snowy plover surveys.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Detectability and Abundance of Snowy Plovers at Salt Plains National Wildlife Refuge, Oklahoma

Heath‐Acre

Conway

Boal

et al. 2020

Journal of Fish and Wildlife Management

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“…Debido a sus requerimientos de hábitat especializados, cualquier alte ración en éstos contribuye a la disminución de las poblaciones (DeSucre et al 2011). Esto resalta la importancia de reportar y estudiar la actividad reproductiva para entender la dinámica poblacional, evaluar dinámicas de fuente-sumidero y respon der a amenazas por alteración antrópica del hábitat (Mellink et al 2009, Saalfeld et al 2013. En el interior de México, el estudio de DeSucre et al (2011) en el lago de Texcoco, Estado de México, es el que aporta más información sobre el proceso de anidación de la especie en la región.…”

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Nueva localidad de reproducción para Charadrius nivosus en el centro de México

Monterrubio‐Rico

Pérez-Arteaga

Murillo

2020

Huitzil Rev. Mex. Ornitol.

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El reporte de sitios reproductivos de chorlo nevado (Charadrius nivosus) es importante debido al estatus de amenazado en México y su vulnerabilidad ante la modificación de hábitats. C. nivosus tiene distribución potencial extensa en México; sin embargo, se han reportado sólo 35 localidades reproductivas, de las cuales nueve se encuentran en el interior del país. En Michoacán, se reconocía su presencia, pero no existían registros de anidación. Aquí presentamos 110 registros reproductivos (pollos y juveniles) de al menos 28 individuos diferentes en el lago de Cuitzeo, Michoacán (años 2013 y 2017). Éstos son los primeros registros reproductivos para el lago y el estado. De acuerdo con estos datos, el lago de Cuitzeo es un sitio relevante para la conservación de la especie en el interior de México. Planteamos extender el muestreo a lo largo del litoral del lago e iniciar el monitoreo para determinar el éxito reproductivo, y así planear medidas que disminuyan la destrucción del hábitat de anidación.

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Evidence for exposure to selenium by breeding interior snowy plovers (Charadrius nivosus) in saline systems of the Southern Great Plains

et al. 2018

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Interior snowy plover (Charadrius nivosus) population declines and deteriorating conditions throughout the Southern Great Plains (SGP) of Texas, New Mexico, and Oklahoma may be linked to environmental contaminants. Concentrations of V, As, Cd, Pb, and Se were quantified in breeding snowy plover blood, feathers (5th primary; P5), and potential prey (tiger beetles [Cicindela circumpicta and C. togata]). Se was (a) most commonly detected relative to other quantified elements and (b) frequently quantified at levels exceeding background or toxicity thresholds. Of samples greater than instrumentation detection limits, 98% of snowy plover blood and 22% of feather samples were greater than Se toxicity thresholds of 1 ppm ww for blood and 5 ppm dw for feathers (blood quantifiable range: 0.83-15.12 ppm; feathers quantifiable range: 1.90-27.47 ppm). Almost all tiger beetle Se concentrations were below reported invertebrate thresholds of 30 ppm dw (quantifiable range: 0.54-45.84 ppm). Snowy plover blood Se concentrations were related to sex, individual body condition, and local tiger beetle Se concentrations, while plover P5 Se concentrations were related to state, sex, and presence of body molt. Tiger beetle Se concentrations were related to individual study sites in Texas. These results provide some of the first evidence of Se exposure risk for interior snowy plovers nesting in saline lake and alkali flat environments of the SGP. Future efforts should focus upon specific Se uptake pathways during breeding and nonbreeding seasons, as snowy plovers breeding in the SGP appear to be exposed to Se throughout their annual cycle.

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Recent Declines in Apparent Survival and Survey Counts of Snowy Plovers Breeding in the Southern High Plains of Texas

Cited by 12 publications

References 33 publications

Detectability and Abundance of Snowy Plovers at Salt Plains National Wildlife Refuge, Oklahoma

Detectability and Abundance of Snowy Plovers at Salt Plains National Wildlife Refuge, Oklahoma

Nueva localidad de reproducción para Charadrius nivosus en el centro de México

Evidence for exposure to selenium by breeding interior snowy plovers (Charadrius nivosus) in saline systems of the Southern Great Plains

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