Patterns and Dynamics of Shorebird Use of California's Central Valley

Shuford, W. David; Page, Gary W.; Kjelmyr, Janet E.

doi:10.2307/1370264

Cited by 101 publications

(121 citation statements)

References 16 publications

Supporting

Mentioning

115

Contrasting

Unclassified

Order By: Relevance

“…Despite extensive historical wetland loss, the Sacramento Valley is recognized by the Western Hemisphere Shorebird Reserve Network as a site of international importance (Western Hemisphere Shorebird Reserve Network, 2009). The valley provides habitat for over 400,000 shorebirds each spring, with the peak of migration typically occurring in April (Central Valley Joint Venture, 2006;Shuford et al, 1998).…”

Section: Study Areamentioning

confidence: 99%

Three decades of Landsat-derived spring surface water dynamics in an agricultural wetland mosaic; Implications for migratory shorebirds

Schaffer‐Smith

Swenson

Barbaree

et al. 2017

Remote Sensing of Environment

View full text Add to dashboard Cite

Satellite measurements of surface water offer promise for understanding wetland habitat availability at broad spatial and temporal scales; reliable habitat is crucial for the persistence of migratory shorebirds that depend on wetland networks. We analyzed water extent dynamics within wetland habitats at a globally important shorebird stopover site for a 1983-2015 Landsat time series, and evaluated the effect of climate on water extent. A range of methods can detect open water from imagery, including supervised classification approaches and thresholds for spectral bands and indices. Thresholds provide a time advantage; however, there is no universally superior index, nor single best threshold for all instances. We used random forest to model the presence or absence of water from >6200 reference pixels, and derived an optimal water probability threshold for our study area using receiver operating characteristic curves. An optimized mid-infrared (1.5-1.7 μm) threshold identified open water in the Sacramento Valley of California at 30-m resolution with an average of 90% producer's accuracy, comparable to approaches that require more intensive user input. SLC-off Landsat 7 imagery was integrated by applying a customized interpolation that mapped water in missing data gaps with 99% user's accuracy. On average we detected open water on ~26000 ha (~3% of the study area) in early April at the peak of shorebird migration, while water extent increased five-fold after the migration rush. Over the last three decades, late March water extent declined by ~1300 ha per year, primarily due to changes in the extent and timing of agricultural flood-irrigation. Water within shorebird habitats was significantly associated with an index of water availability at the peak of migration. Our approach can be used to optimize thresholds for time series analysis and near-real-time mapping in other regions, and requires only marginally more time than generating a confusion matrix.

show abstract

Section: Study Areamentioning

confidence: 99%

Three decades of Landsat-derived spring surface water dynamics in an agricultural wetland mosaic; Implications for migratory shorebirds

Schaffer‐Smith

Swenson

Barbaree

et al. 2017

Remote Sensing of Environment

View full text Add to dashboard Cite

show abstract

“…For example, nearly three million ducks, two million geese, and 350,000 shorebirds continue to overwinter in this region (Shuford et al 1998;Olson 2014), making the Central Valley an internationally important area for migratory waterbirds in the Pacific Flyway (Fleskes 2012;Gilmer et al 1982;WHSRN 2003). Hence, prioritization of conservation actions in the Central Valley for these waterbirds and landbirds is a critical step toward increasing their populations.…”

Section: What Are Conservation Objectives and Why Set Them?mentioning

confidence: 99%

The Science of Setting Conservation Objectives for Birds in California’s Central Valley: An Introduction

Gardali¹,

Marty²,

Yarris³

2017

SFEWS

View full text Add to dashboard Cite

“…In particular, the San Francisco Bay estuary holds more shorebirds than any other site on the Pacific coast of the conterminous United States (Page et al 1999). Likewise, the Central Valley is one of the most important regions for shorebirds in western North America, holding more birds in winter and spring than any other inland area (Shuford et al 1998). …”

Section: Role Of Bcr 32 In North American Waterbird Conservationmentioning

confidence: 99%

“…Instead, the CVJV (2006) developed population objectives for shorebirds from broad-scale surveys of wintering shorebirds in the Central Valley conducted from 1992 to 1994 (Shuford et al 1998), adjusted upward to account for missing birds and depressed numbers during the survey period.…”

Section: Conservation Goalsmentioning

confidence: 99%

Wintering ecology of sympatric subspecies of Sandhill Crane: Correlations between body size, site fidelity, and movement patterns

et al. 2015

View full text Add to dashboard Cite

Patterns and Dynamics of Shorebird Use of California's Central Valley

Cited by 101 publications

References 16 publications

Three decades of Landsat-derived spring surface water dynamics in an agricultural wetland mosaic; Implications for migratory shorebirds

Three decades of Landsat-derived spring surface water dynamics in an agricultural wetland mosaic; Implications for migratory shorebirds

The Science of Setting Conservation Objectives for Birds in California’s Central Valley: An Introduction

Wintering ecology of sympatric subspecies of Sandhill Crane: Correlations between body size, site fidelity, and movement patterns

Contact Info

Product

Resources

About