Patterns of Testosterone and Prolactin Concentrations and Reproductive Behavior of Helpers and Breeders in the Cooperatively Breeding Red-Cockaded Woodpecker (Picoides borealis)

2001 ◽  
Vol 40 (1) ◽  
pp. 1-13 ◽  
Author(s):  
Memuna Z. Khan ◽  
F.M.A. McNabb ◽  
Jeffrey R. Walters ◽  
P.J. Sharp
Keyword(s):  
Reproductive Behavior ◽  
Picoides Borealis ◽  
Cooperatively Breeding ◽  
Red Cockaded Woodpecker

Decline of the Red-Cockaded Woodpecker (Picoides borealis) in Southeastern Oklahoma

1994 ◽  
Vol 132 (2) ◽  
pp. 275 ◽  
Author(s):  
Jeffrey F. Kelly ◽  
Sandra M. Pletschet ◽  
David M. Leslie
Keyword(s):  
Picoides Borealis ◽  
Red Cockaded Woodpecker

scholarly journals Inbreeding Depression and its Effects on Natal Dispersal in Red-Cockaded Woodpeckers

The Condor ◽  
2000 ◽  
Vol 102 (3) ◽  
pp. 482-491 ◽  
Author(s):  
Susan J. Daniels ◽  
Jeffrey R. Walters
Keyword(s):  
Spatial Clustering ◽  
Large Population ◽  
Dispersal Distance ◽  
Significant Loss ◽  
Natal Dispersal ◽  
Picoides Borealis ◽  
Fitness Consequences ◽  
Cooperatively Breeding ◽  
Dispersal Behavior ◽  
Close Inbreeding

Abstract Natal dispersal is a key life-history component that may be influenced by the fitness consequences of inbreeding. We studied natal dispersal and inbreeding within a large population of cooperatively breeding, endangered Red-cockaded Woodpeckers (Picoides borealis). We assessed the costs of close inbreeding, the spatial distribution of related males and its relationship to dispersal distance of females, and the change in dispersal behavior of females in the presence of closely related males. Close inbreeding resulted in a significant loss of fitness, through two separate effects: closely related pairs (kinship coefficient ≥ 0.125) exhibited lowered hatching rates and lowered survival and recruitment of fledglings relative to unrelated pairs. Despite a highly predictable spatial clustering of closely related males near the female's natal territory, natal dispersal distance of females was not sufficient to avoid these males as mates. Females changed dispersal behavior in the presence of closely related males on the natal territory: female fledglings were significantly more likely to disperse from natal territories if there were closely related males breeding there in the following year. Females did not change dispersal behavior in the presence of related males that were not on the natal territory. We suggest that dispersal behavior is a trade-off between benefits of short-distance dispersal, e.g., an advantage in competing for scarce breeding vacancies, and the substantial cost of close inbreeding.

scholarly journals Seasonal Body Weight Variation in Five Species of Woodpeckers

The Condor ◽  
2005 ◽  
Vol 107 (4) ◽  
pp. 810-822
Author(s):  
Walter D. Koenig ◽  
Eric L. Walters ◽  
Jeffrey R. Walters ◽  
James S. Kellam ◽  
Klaus G. Michalek ◽  
...  
Keyword(s):  
Body Weight ◽  
Time Of Day ◽  
Temperate Zone ◽  
Food Storage ◽  
Picoides Borealis ◽  
Resident Species ◽  
Weight Variation ◽  
Dendrocopos Major ◽  
Red Cockaded Woodpecker ◽  
Winter Fattening

Abstract We investigated patterns of seasonal variation in body weight in six populations of five resident species of temperate-zone woodpeckers: Acorn Woodpecker (Melanerpes formicivorus), Red-bellied Woodpecker (M. carolinus), Red-cockaded Woodpecker (Picoides borealis), Downy Woodpecker (P. pubescens), and Great Spotted Woodpecker (Dendrocopos major). After controlling for time of day and overall body size, annual variation in body weight was small and generally not statistically significant. However, analysis revealed evidence of significant “winter fattening,” comparable in magnitude to other temperate-zone resident species, in three of the species. The degree of winter fattening did not correlate with either the size of the acorn crop (for the Acorn Woodpecker) or latitude, two variables potentially related to predictability of food resources. However, the smaller species exhibited significantly greater winter fattening than the larger species, as predicted by the hypothesis that energy storage should be more important for small-bodied species. Furthermore, the food-storing Acorn Woodpecker exhibited considerably less winter fattening than the nonfood-storing species, supporting the hypothesis that food storage provides an ecological alternative to winter fattening.

Novel tetranucleotide and pentanucleotide microsatellite loci in the red-cockaded woodpecker (Picoides borealis)

2009 ◽  
Vol 1 (1) ◽  
pp. 213-215 ◽  
Author(s):  
Travis I. Alstad ◽  
Brian M. Shamblin ◽  
Robert J. Warren ◽  
Jonathan M. Stober ◽  
L. Mike Conner ◽  
...  
Keyword(s):  
Microsatellite Loci ◽  
Picoides Borealis ◽  
Red Cockaded Woodpecker
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