scholarly journals Assessing Migratory Stopover Site Quality for Birds During Fall Migration Along Two California Rivers

2013 ◽  
Vol 73 (1) ◽  
pp. 72-79 ◽  
Author(s):  
Renée L. Cormier ◽  
Thomas Gardali ◽  
Julian K. Wood
Keyword(s):  
Site Quality ◽  
Stopover Site ◽  
Migratory Stopover

scholarly journals Temporal and Spatial Patterns in Daily Mass Gain of Magnolia Warblers During Migratory Stopover

The Auk ◽  
2000 ◽  
Vol 117 (1) ◽  
pp. 12-21 ◽  
Author(s):  
Erica H. Dunn ◽  
F. R. Moore
Keyword(s):  
Mass Gain ◽  
Site Quality ◽  
Short Term ◽  
Stopover Site ◽  
Temporal And Spatial Patterns ◽  
Stopover Sites ◽  
Similar Information ◽  
Temporal And Spatial ◽  
Migratory Stopover

Abstract Whether or not migrants gain mass at a stopover site is an index of site quality. Previous studies have examined mass gain of recaptured birds, and of short-term stopovers by regressing mass at first capture on hour of day. I developed an extension of the latter method using multiple regression to examine the effects on mass gain of hour of day, date, and year. I then used the method to compare the quality of three stopover sites at Long Point, Ontario, for Magnolia Warblers (Dendroica magnolia). At the peak of fall migration, warblers at all three sites gained sufficient mass for a net gain over 24 h, but they gained mass at only two of three sites during spring. Mass gain varied significantly over the course of the day, by date in the season, and among years. The earliest spring migrants lost mass at all sites, but rate of mass gain increased as the season progressed. Similar information for many more species and stopover sites might aid in habitat conservation for migrants.

scholarly journals Estimating transient populations of unmarked individuals at a migratory stopover site using generalized N‐mixture models

2018 ◽  
Vol 55 (6) ◽  
pp. 2917-2932 ◽  
Author(s):  
Eunbi Kwon ◽  
Lawrence M. Houghton ◽  
Robert E. Settlage ◽  
Daniel H. Catlin ◽  
Sarah M. Karpanty ◽  
...  
Keyword(s):  
Mixture Models ◽  
Stopover Site ◽  
Migratory Stopover

scholarly journals Shorebird hunting in Barbados: Using stable isotopes to link the harvest at a migratory stopover site with sources of production

The Condor ◽  
2018 ◽  
Vol 120 (2) ◽  
pp. 357-370 ◽  
Author(s):  
Eric T. Reed ◽  
Kevin J. Kardynal ◽  
Julia A. Horrocks ◽  
Keith A. Hobson
Keyword(s):  
Stable Isotopes ◽  
Stopover Site ◽  
Migratory Stopover

Burrowing Owl Diet at a Migratory Stopover Site and Wintering Ground on Southeast Farallon Island, California

2016 ◽  
Vol 50 (4) ◽  
pp. 391-403 ◽  
Author(s):  
Sara L. Chandler ◽  
James R. Tietz ◽  
Russell W. Bradley ◽  
Lynne Trulio
Keyword(s):  
Stopover Site ◽  
Burrowing Owl ◽  
Migratory Stopover ◽  
Wintering Ground

scholarly journals Daily Mass Changes in Landbirds During Migration Stopover on the South Shore of Lake Ontario

The Auk ◽  
2007 ◽  
Vol 124 (1) ◽  
pp. 122-133 ◽  
Author(s):  
David N. Bonter ◽  
Therese M. Donovan ◽  
Elizabeth W. Brooks
Keyword(s):  
Lake Ontario ◽  
Mass Gain ◽  
Spring Migration ◽  
Site Quality ◽  
Autumn Migration ◽  
Lean Body Weight ◽  
Conservation Priorities ◽  
The South ◽  
Stopover Site ◽  
South Shore

Abstract Assigning conservation priorities to areas used by birds during migration requires information on the relative quality of areas and habitats. The rate at which migratory birds replenish energy reserves during stopover may be used as an indicator of stopover-site quality. We estimated the rate of mass gain of 34 landbird species during stopover at a near-shore terrestrial site on the south shore of Lake Ontario in New York during 12 migration seasons from 1999 to 2004. The average rate of mass gain was estimated by relating a measure of condition to time of capture (hour after sunrise) with linear regression. Data from 25,385 captures were analyzed. Significantly positive rates of mass change were detected for 20 of 30 species during spring migration and 19 of 21 species during autumn migration. No significantly negative trends were detected in either season. Daily rates of mass gain across all species averaged 9.84% of average lean body weight during spring migration and 9.77% during autumn migration. Our regression estimates were significantly greater than estimates from traditional analyses that examine mass changes in recaptured birds. Analyses of mass changes in recaptured birds revealed a mean daily change of −0.68% of average lean mass in spring and 0.13% in autumn. Because of sampling biases inherent in recapture analyses, the regression approach is likely more accurate when the assumptions of the method are met. Similar studies in various habitats, landscapes, and regions are required to prioritize conservation efforts targeting migratory stages of the annual cycle. Cambios de Peso Diarios de Aves Terrestres durante las Paradas Migratorias en la Costa sur del Lago Ontario

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