Ecology and Management of Cowbirds and Their Hosts: Studies in the Conservation of North American Passerine Birds. James N. M. Smith, Terry L. Cook , Stephen I. Rothstein , Scott K. Robinson , Spencer G. Sealy

2001 ◽  
Vol 76 (2) ◽  
pp. 247-247
Author(s):  
Mark E. Hauber
Keyword(s):  
North American ◽  
Passerine Birds

The Influence of Habitats on Mating Systems of North American Passerine Birds

Ecology ◽  
1966 ◽  
Vol 47 (1) ◽  
pp. 143-147 ◽  
Author(s):  
Jared Verner ◽  
Mary F. Willson
Keyword(s):  
North American ◽  
Mating Systems ◽  
Passerine Birds

scholarly journals Group-foraging is not associated with longevity in North American birds

2009 ◽  
Vol 6 (1) ◽  
pp. 42-44 ◽  
Author(s):  
Guy Beauchamp
Keyword(s):  
Body Mass ◽  
Group Size ◽  
North American ◽  
Life History Theory ◽  
Foraging Efficiency ◽  
Passerine Birds ◽  
Group Foraging ◽  
Evolutionary Transitions ◽  
Age At First Reproduction ◽  
First Reproduction

Group-foraging is common in many animal taxa and is thought to offer protection against predators and greater foraging efficiency. Such benefits may have driven evolutionary transitions from solitary to group-foraging. Greater protection against predators and greater access to resources should reduce extrinsic sources of mortality and thus select for higher longevity according to life-history theory. I assessed the association between group-foraging and longevity in a sample of 421 North American birds. Taking into account known correlates of longevity, such as age at first reproduction and body mass, foraging group size was not correlated with maximum longevity, with and without phylogenetic correction. However, longevity increased with body mass in non-passerine birds. The results suggest that the hypothesized changes in predation risk with group size may not correlate with mortality rate in foraging birds.

Rarity in North American Passerine Birds

1994 ◽  
Vol 8 (4) ◽  
pp. 1141-1145 ◽  
Author(s):  
David W. Mehlman
Keyword(s):  
North American ◽  
Passerine Birds
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