Don’t Tread On Me: Sensitive Species Avoidance Len Liu PRBO Conservation Science May 1, 2011 Generally... • High tides=less refugia • Higher vegetation and larger clumps=better nest substrate and refugia • Vegetation complexity=higher probability of nesting • Stay on paths; high step like in snow to minimize vegetation trampling • Most birds don’t nest on bare ground • Be aware of birds flushing from vegetation– possible nest, try a different route • Disturbed birds that stick around may be guarding a nest or young nearby 1
Clapper Rail Often nest near channels Nest preference: 1 st and 2 nd order channels Distress calls: squawk and screech Black Rail More likely at higher elevations and away from channels Nest substrate varies Upright flight posture Distress call: Grr-grr-grrr 2
Common Yellowthroat • Prefers taller vegetation with high complexity • Nest is fairly low, very well concealed • Distress note is a hard tschip Song Sparrow • Nests in vegetation slightly to moderately taller than surroundings • Nest is usually low, but higher in taller vegetation • Distress calls: “bark”; soft “tsip” to silence nestlings 3
Salt marsh harvest mouse • dependent on dense cover • preferred habitat is pickleweed • nest is commonly a ball of vegetation that is on the ground or up in pickleweed • seldom found in cordgrass or alkali bulrush • use transition zone and to escape the higher high tides Find Her! They don’t want to be found. They usually will let you know if you have found them. 4
Vocalizations Clapper Rail http://www.xeno-canto.org/browse.php?query=clapper+rail Screech call: Catalog #XC70045 Black Rail http://www.xeno-canto.org/XCspeciesprofiles.php?species_nr2=544.00 Grr-grr-grr call: Catalog #s XC1145, XC16582 and XC20560 Common Yellowthroat http://www.allaboutbirds.org/guide/Common_Yellowthroat/sounds Song Sparrow http://www.allaboutbirds.org/guide/Song_Sparrow/sounds http://www.xeno-canto.org/browse.php?query=melospiza+melodia Chip call: Catalog #s XC35902
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