Headwater Riparian Habitat: Prime Real Estate For Birds. Joan Hagar, USGS-FRESC Judy Li and Janel Sobota , OSU Department of Fish & Wildlife. Riparian Reserves. Designed to protect AQUATIC resources Riparian habitat is also important for some TERRESTRIAL wildlife species
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Headwater Riparian Habitat: Prime Real Estate For Birds
Joan Hagar, USGS-FRESC
Judy Li and JanelSobota, OSU Department of Fish & Wildlife
Designed to protect AQUATIC resources
Riparian habitat is also important for some TERRESTRIAL wildlife species
Function of headwater riparian areas as habitat for terrestrial species?
Higher abundance and diversity of birds reputed for riparian habitat
Emergent aquatic insects may provide a “subsidy” to terrestrial consumers
Higher capture rates of some bird species in Trask headwater riparian areas compared to uplands
Do aquatic subsidies explain riparian association?
Deciduous vegetation supports more arthropod prey than conifers
Deciduous tends to flourish streamside, Conifers upslope
Pattern less pronounced on high-gradient headwater streams
Changes in distribution of arthropod prey in relation to stream size?
Relate the distribution of birds along inter-riparian gradients in headwater forests to availability of insect prey
Swainson’s Thrush, Pacific-slope Flycatcher, Wilson’s Warbler, and Pacific Wren
Diet samples collected from birds captured in nets
ID fragments in fecal samples to Order; Aquatic vs Terrestrial
Streamside and Upland
Malaise: Adult Aquatic and Terrestrial Insects
(once per week)
Emergence: Adult Aquatic Insects
(2x per week)
What are the birds eating?
Beetles and Flies were popular fare
Aquatic emergents (EPT) rare
Fruit was important in Swainson’s thrush diet
Gradients in arthropod prey availability
Biomass of Flying Insects (>2 mm)
(Mean + S.E.)
More prey in riparian than upslope samples
Distinct riparian vegetation may influence prey abundance
Riparian vegetation contributes to aquatic and terrestrial food webs
Understory may be helpful in defining management zones