Eared Grebe (Podiceps nigricollis)

Cullen, S. A.; Jehl, Joseph R.; Nuechterlein, Gary L.

doi:10.2173/bna.433

Cited by 28 publications

(38 citation statements)

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“…These grebes breed annually in small numbers, or irregularly in much larger numbers, primarily in the Tulare Basin, and mainly on shallow-water seasonal wetlands flooded in years of high runoff or in agricultural evaporation basins. The main requirements appear to be emergent or other aquatic vegetation for building and attaching floating nests, and abundant aquatic invertebrate prey, although the use of specific nesting wetlands is unpredictable and may change frequently (Cullen et al 1999). Threats include direct mortality from disease, and embryonic mortality and abnormalities from selenium in agricultural drain water (Ohlendorf et al 1986;Cullen et al 1999).…”

Section: Eared Grebementioning

confidence: 99%

Conservation Objectives for Wintering and Breeding Waterbirds in California's Central Valley

Shuford¹,

Dybala²

2017

SFEWS

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Birds associated with wetlands have declined historically across North America from extensive habitat loss and degradation. Among the regions most affected is California's Central Valley, where over 90% of the wetland base has been lost. Still, this region remains of continental importance to waterbirds. On-the-ground conservation efforts for all bird groups are the focus of the Central Valley Joint Venture, guided by a periodically updated implementation plan. To track progress toward goal attainment, that plan sets time-bound, quantitative conservation goals. Lacking robust data on the size and trends of populations of most species of waterbirds in the Central Valley, we set conservation goals for this group by selecting 10 focal species. These species are of heightened conservation concern or are otherwise representative of the habitat needs of Central Valley waterbirds. Given the great loss of historical habitat, we assumed focal species populations have declined by ≥ 50%. Hence, we defined population objectives for most focal species as increasing their current populations by 10% over 10 years and doubling them in 100 years. The corresponding habitat objectives are to increase wetlands or enhance suitable crops for waterbirds in proportion to the population objectives. These include an increase over 10 years of 7,948 ha (19,641 acres) of winter seasonal wetlands, 921 ha (2,276 acres) each of semi-permanent and summer seasonal wetlands, and 573 ha (1,416 acres) of strategically placed riparian forest. Agricultural needs include additional winter flooding of 15,160 ha (37,461 acres) of rice and 2,137 ha (5,281 acres) of corn. We distributed the habitat objectives across five planning regions, in some cases favoring proportionally larger increases in those regions with the greatest need. To maximize success, however, conservationists must take into account the specific needs of individual waterbird species, as a one-size-fits-all approach will not support the highest diversity of waterbirds.

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Section: Eared Grebementioning

confidence: 99%

Conservation Objectives for Wintering and Breeding Waterbirds in California's Central Valley

Shuford¹,

Dybala²

2017

SFEWS

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“…17b) is driven by two points showing grebe population growth of 4.8 and 5.4 birds bird À1 yr À1 . However, a population growth rate of this magnitude would require 10-11 offspring produced per female yr À1 , far in excess of the reproductive capacity of this species (Cullen et al 1999). Consequently, it is improbable that reproduction could have been sufficient to cause these remarkable increases in the population surveyed at the lake.…”

Section: Brine Shrimp and Eared Grebe Population Growthmentioning

confidence: 99%

The Great Salt Lake Ecosystem (Utah, USA): long term data and a structural equation approach: Comment

Wurtsbaugh

2014

Ecosphere

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“…), sago pondweed (Stuckenia pectinatus), claspingleaf pondweed (Potamogeton richardsonii), widgeon grass (Ruppia maritima), and common watermilfoil (Myriophyllum heterophyllum) (Stewart 1975, Boe 1993, and emergent plants such as hardstem bulrush (Schoenoplectus acutus) (Faanes and Lingle 1995) and reeds (Phragmites) (Salt and Salt 1976). Suitable habitat includes freshwater and saline seasonal, semipermanent, and permanent wetlands and lakes, shallow river impoundments, stock ponds, and sewage lagoons (Stewart 1975, Krapu and Green 1978, Knodel 1979, Johnsgard 1980, Uresk and Severson 1988, Boe 1992, Faanes and Lingle 1995, Baylor 1998, Cullen et al 1999.…”

Section: Suitable Habitatmentioning

confidence: 99%

Effects of management practices on wetland birds: Eared Grebe

2002

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Eared Grebe (Podiceps nigricollis)

Cited by 28 publications

References 0 publications

Conservation Objectives for Wintering and Breeding Waterbirds in California's Central Valley

Conservation Objectives for Wintering and Breeding Waterbirds in California's Central Valley

The Great Salt Lake Ecosystem (Utah, USA): long term data and a structural equation approach: Comment

Effects of management practices on wetland birds: Eared Grebe

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