Metapopulation structure, population trends, and status of Florida Grasshopper Sparrows

Tucker, James W.; Schrott, Gregory R.; Delany, Michael F.; Glass, Stephen L.; Hannon, Christina L.; Miller, Paul R.; Bowman, Reed

doi:10.1111/j.1557-9263.2010.00282.x

Cited by 4 publications

(2 citation statements)

References 17 publications

(33 reference statements)

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“…The sparrow inhabits three patches of publicly owned land: Three Lakes Wildlife Management Area, Kissimmee Prairie Preserve State Park, and Avon Park Air Force Range. The population at Avon Park Air Force Range was at one time the largest monitored but has experienced an estimated 99% decline since 1997 (Tucker et al 2010a), and by 2012, the population was nearly extirpated. Populations at Kissimmee Prairie Preserve State Park have also declined (Tucker et al 2010a) but only more recently.…”

Section: Introductionmentioning

confidence: 99%

“…The population at Avon Park Air Force Range was at one time the largest monitored but has experienced an estimated 99% decline since 1997 (Tucker et al 2010a), and by 2012, the population was nearly extirpated. Populations at Kissimmee Prairie Preserve State Park have also declined (Tucker et al 2010a) but only more recently. Causes of these declines are poorly understood, but two of the three extant populations are now too small to quantitatively assess the impacts of most management practices on Florida Grasshopper Sparrow demography.…”

Section: Introductionmentioning

confidence: 99%

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Risk from cattle trampling to nests of an endangered passerine evaluated using artificial nest experiments and simulations

Rolek¹,

Schrott²,

Poulton³

et al. 2016

ACE

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Grasslands are often grazed by cattle and many grassland birds nest on the ground, potentially exposing nests to trampling. We tested for trampling risk introduced by cattle to nests of endangered Florida Grasshopper Sparrows (Ammodramus savannarum floridanus) using experimentally paired grids of artificial nests (i.e., clay targets) similar in size to nests of Florida Grasshopper Sparrows and counted the number of clay targets that were broken in paired grazed and ungrazed enclosures. Clay targets in grazed grids were trampled 3.9% more often than their respective ungrazed grids, and measurements of cattle presence or density were correlated with the number of broken clay targets, suggesting that excluding cattle during breeding is an important management recommendation for the Florida Grasshopper Sparrow. Trampling rates within grazed enclosures were spatially homogeneous with respect to cattle infrastructure such as supplemental feeding troughs and fences, and forests and stocking density were poor predictors of trampling rates when excluding ungrazed grids. We used population viability analysis to compare quasi-extinction rates, intrinsic growth rates, and median abundance in grazed and ungrazed Florida Grasshopper Sparrow aggregations to further understand the biological significance of management aimed at reducing trampling rates during the breeding season. Simulations indicated that trampling from grazing increased quasi-extinction rates by 41% while reducing intrinsic growth rates by 0.048, and reducing median abundance by an average of 214 singing males after 50 years. Management should avoid grazing enclosures occupied by Florida Grasshopper Sparrows during the nesting season to minimize trampling rates. Our methods that combine trampling experiments with population viability analysis provide a framework for testing effects from trampling on other grassland ground-nesting birds, and can directly inform conservation and management of the Florida Grasshopper Sparrow. Évaluation du risque de piétinement par le bétail de nids de passereaux menacés à partir d'expériences avec des nids artificiels et de simulations RÉSUMÉ. Les prairies sont souvent broutées par le bétail et de nombreux oiseaux de prairie nichent au sol, exposant ainsi potentiellement leur nid au piétinement. Nous avons testé le risque de piétinement causé par le bétail des nids du Bruant sauterelle de Floride (Ammodramus savannarum floridanus), une espèce menacée, au moyen de grilles expérimentales appariées de nids artificiels (c.à-d. disques d'argile), semblables en taille aux nids des Bruants sauterelles de Floride. Nous avons compté le nombre de disques d'argile qui ont été détruits dans les enclos appariés broutés ou non broutés. Les disques d'argile situés dans les grilles broutées ont été piétinés 3,9 % plus souvent que ceux qui sont sis dans les grilles non broutées appariées, et les mesures de la présence du bétail ou de la densité étaient corrélées avec le nombre de disques détruits; ces résultats nous mènent à recommander fortement...

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Risk from cattle trampling to nests of an endangered passerine evaluated using artificial nest experiments and simulations

Rolek¹,

Schrott²,

Poulton³

et al. 2016

ACE

Self Cite

View full text Add to dashboard Cite

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Employing landscape metrics in an open population model to estimate demographic parameters of a grassland bird

et al. 2017

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Sources of Variation in the Abundance and Detection of the Endangered Florida Grasshopper Sparrow

Delany¹,

Kiltie²,

Glass³

et al. 2013

Southeastern Naturalist

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Unmarked aims to be a complete environment for the statistical analysis of data from surveys of unmarked animals. Currently, the focus is on hierarchical models that separately model a latent state (or states) and an observation process. This vignette provides a brief overview of the package -for a more thorough treatment see [2] 1 Overview of unmarked Unmarked provides methods to estimate site occupancy, abundance, and density of animals (or possibly other organisms/objects) that cannot be detected with certainty. Numerous models are available that correspond to specialized survey methods such as temporally replicated surveys, distance sampling, removal sampling, and double observer sampling. These data are often associated with metadata related to the design of the study. For example, in distance sampling, the study design (line-or point-transect), distance class break points, transect lengths, and units of measurement need to be accounted for in the analysis. Unmarked uses S4 classes to store data and metadata in a way that allows for easy data manipulation, summarization, and model specification. Table 1 lists the currently implemented models and their associated fitting functions and data classes.

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Metapopulation structure, population trends, and status of Florida Grasshopper Sparrows

Cited by 4 publications

References 17 publications

Risk from cattle trampling to nests of an endangered passerine evaluated using artificial nest experiments and simulations

Risk from cattle trampling to nests of an endangered passerine evaluated using artificial nest experiments and simulations

Employing landscape metrics in an open population model to estimate demographic parameters of a grassland bird

Sources of Variation in the Abundance and Detection of the Endangered Florida Grasshopper Sparrow

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