The Use of Pond Habitats by Birds in Golden Gate Park, San Francisco, California PDF Download
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Author: Carla Cicero
Publisher:
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Category :
Languages : en
Pages : 366
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Author: Carla Cicero
Publisher:
ISBN:
Category :
Languages : en
Pages : 366
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Category : Conservation of natural resources
Languages : en
Pages : 368
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Author: Nicole Denise Athearn
Publisher:
ISBN: 9781267238221
Category :
Languages : en
Pages :
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Migratory waterbirds depend upon San Francisco Bay salt ponds for overwintering and stopover habitats, but many ponds are now the focus of tidal salt marsh restoration efforts. Meeting the needs of migratory waterbirds with reduced pond area requires careful evaluation of avian needs and the development of models to evaluate management scenarios. Because water depth is a key determinant of the usability of ponds for bird species, we evaluated comparability and accuracy of pond bathymetry data from two sources, a boat-based echosounder on flooded ponds and aerial LiDAR on dry ponds. Mean elevations of the LiDAR points were lower than the echosounder results by no more than 5 ± 0.1 cm, suggesting that aerial LiDAR can be used in conjunction with echosounder data to derive water depths for evaluation of bird habitats. Water depth, as well as water level fluctuations, affects habitat use in salt ponds, particularly in newly breached ponds subject to continuous tidal changes. In a newly-breached salt pond in the Napa-Sonoma Marshes restoration project, shorebirds comprised 1% of area totals prior to breaching and increased to 46% after breaching. Water depth and salinity differences likely explained the differences in habitat use by South Bay waterbirds between lower-salinity decommissioned ponds planned for tidal salt marsh restoration and those maintained as higher-salinity commercial salt production ponds. Salt pond complex use was consistent within waterbird groups and variable among groups, with most use occurring in decommissioned ponds: 73% of ducks were observed in decommissioned and 9% in the commercial ponds; 51% of shorebirds were in decommissioned and only 17% in commercial ponds; and 56% of piscivores were in decommissioned and
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Category : Birds
Languages : en
Pages : 786
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Category : Golden Gate National Recreation Area (Calif.)
Languages : en
Pages : 512
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Author:
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Category :
Languages : en
Pages : 490
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Category : Fisheries
Languages : en
Pages : 988
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Category : Game and game-birds
Languages : en
Pages : 408
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Category : Coastal ecology
Languages : en
Pages : 160
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Author:
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Category : Agriculture
Languages : en
Pages : 874
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