A Summary of Trumpeter Swan Production at Malheur National Wildlife Refuge, Oregon

Cornely, John E.; Thompson, Steven P.; Mclaury, Eldon L.; Napier, Larry D.

doi:10.2307/3533766

Cited by 4 publications

(6 citation statements)

References 5 publications

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“…These bodies of water vary in depth, salinity, and presence of aquatic vegetation, but all play important roles in wildlife conservation. Many lakes and wetlands are identified as globally important breeding habitat for waterbirds, including the American white pelican (Pelecanus erythrorhynchos); waterfowl; and shorebirds, including species of concern such as the snowy plover (Charadrius alexandrines, Cornely 1982;Knopf and Kennedy 1980;Jehl 1986;Neel and Henry 1996;Warnock and other 1998;Manning and Paul 2003). Wetlands and lakes are used by impressive numbers of migratory waterbirds for stopover and staging areas (Boula 1985;Jehl 1986;Oring and Reed 1996;Warnock and other 1998;Jehl and others 2002;Manning and Paul 2003) and are an important component of bald eagle (Haliaeetus leucocephalus) winter habitat (Isaacs and Anthony1987).…”

Section: Overview Of Climatic Conditions and Habitatsmentioning

confidence: 99%

Climate change in grasslands, shrublands, and deserts of the interior American West: a review and needs assessment

Finch¹

2012

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Section: Overview Of Climatic Conditions and Habitatsmentioning

confidence: 99%

Climate change in grasslands, shrublands, and deserts of the interior American West: a review and needs assessment

Finch¹

2012

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“…Riffell et al (2003) suggest future landscape-level research should include demographic data such as nest success to compliment studies of wetland bird productivity. (Cornely 1982, Langston 2003. Malheur Lake is the largest freshwater marsh in the Western United States and historically highly productive for water birds (Cornely 1982).…”

Section: The Spatial Arrangement Of Patches Of Plant Communities Withmentioning

confidence: 99%

“…(Cornely 1982, Langston 2003. Malheur Lake is the largest freshwater marsh in the Western United States and historically highly productive for water birds (Cornely 1982). In 1935, the Donner und Blitzen River Valley, and in 1942 the Double O Ranch, were added to the Refuge to protect water sources to the lakes and additional breeding habitat.…”

Section: The Spatial Arrangement Of Patches Of Plant Communities Withmentioning

confidence: 99%

“…In 1935, the Donner und Blitzen River Valley, and in 1942 the Double O Ranch, were added to the Refuge to protect water sources to the lakes and additional breeding habitat. The Refuge provides habitat to over 320 bird species at various times of the year and is an important breeding ground to migratory birds along the Pacific Flyway (Cornely 1982, Langston 2003. Johnson (1979) and described in detail by Klett et al (1986) intervals between visits, as is common in waterfowl stud provides too much exposure to failed nests (Johnson 1979).…”

Section: The Spatial Arrangement Of Patches Of Plant Communities Withmentioning

confidence: 99%

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Influence of Wetland Landscape Structure on Duck Nest Success at Malheur National Wildlife Refuge, Oregon

Craver¹

2000

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The decline of waterfowl populations and their requisite wetland habitats remains a concern. Because migratory bird refuges are often artificial landscapes of actively managed wetlands, and wildlife populations experience their greatest change during the breeding season, refuges should be designed to maximize breeding habitat. While past nest success studies have focused on at-nest variables, new approaches are needed to evaluate the effect of composition and configuration of plant communities at the landscape scale. This study aims to quantify landscape patterns within individual refuge management units to determine influence upon historical nesting success averages of ducks at Malheur National Wildlife Refuge in southeastern Oregon. The Mayfield estimate of nest success for 8 duck species yields a survival rate of 25% for the years 1987-1998 with a range of 0-74% across 48 management units. FRAGSTATS was used to calculate a suite of 9 landscape pattern metrics per unit at the class-level for each of 3 wetland habitat classes, and at the landscape-level using all habitat types. These 36 variables were tested for association with survival rate using Pearson R correlation. Results suggest fragmentation of dry meadow habitat; patch size, complexity, and extensiveness of wet meadow habitat; and diversity of habitats across the landscape positively influence duck nest success at the scale of the individual management unit.

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“…The Malheur National Wildlife Refuge, established in 1908, encompasses about 740 square kilometers (km 2 ) of land in southeastern Oregon with shallow lakes, rivers, and semiarid uplands (Cornely, 1982). Historically, Malheur Lake was a vast freshwater hemi-marsh characterized by stands of hardstem bulrush (Schoenoplectus acutus), abundant sago pondweed (Potamogeton pectinatus), and average depths of about 1 meter (m).…”

Section: Introductionmentioning

confidence: 99%

Implications of water, sediment, and nutrient budgets for the restoration of a shallow, turbid lake in semiarid southeastern Oregon

Smith,

Wood

2023

Scientific Investigations Report

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Malheur Lake is the largest lake in the endorheic Harney Basin in southeastern Oregon. Since the 1990s, Malheur Lake-which averages depths of about 1 meter-has been in a degraded, turbid state lacking submergent and emergent vegetation. The goals of this study were to identify the major sources of sediment and nutrients to Malheur Lake to determine the importance of managing nutrients for lake restoration. Discrete water samples were analyzed for nutrient (total phosphorus, total nitrogen, orthophosphate, nitrate+nitrite, and ammonia) and suspended-sediment concentrations, and additional parameters including chlorophyll-a and phytoplankton biomass were measured in lake samples. Lake area fluctuated from a minimum of 3,300 hectares (ha) to a maximum of 11,300 ha in water years 2019 and 2020. In water year 2019, inflow from the tributaries created a 1,400-hectare area in the lake with low turbidity that persisted for multiple months. Land-use practices and water diversions along the tributaries affected the hydrographs and nutrient and suspended-sediment concentrations reaching the lake. As lake area increased, storage of sediment-associated constituents in the water column increased in excess of external loads because of resuspension. In 2019, 69 percent of the increase in suspended-sediment storage in the water column was attributed to internal resuspension and 31 percent was from external loading. Sediment was deposited as lake area decreased, and water-column storage decreased even as positive external loading continued. The internal resuspension, deposition, and external loading of suspended sediment likely is decreasing topographic heterogeneity in the lake. Concentrations of total phosphorus and orthophosphate are substantially higher than in the 1980s, and the lake is eutrophic. Phytoplankton in the lake was light limited in 2019-20, and restoration actions that prioritize vegetation establishment would reduce bioavailable nutrients for phytoplankton while increasing light in the water column.

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A Summary of Trumpeter Swan Production at Malheur National Wildlife Refuge, Oregon

Cited by 4 publications

References 5 publications

Climate change in grasslands, shrublands, and deserts of the interior American West: a review and needs assessment

Climate change in grasslands, shrublands, and deserts of the interior American West: a review and needs assessment

Influence of Wetland Landscape Structure on Duck Nest Success at Malheur National Wildlife Refuge, Oregon

Implications of water, sediment, and nutrient budgets for the restoration of a shallow, turbid lake in semiarid southeastern Oregon

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