Geographic Clines of Age Ratios of Black-Throated Blue Warblers (Dendroica Caerulescens)

Ecology ◽  
1997 ◽  
Vol 78 (8) ◽  
pp. 2524 ◽  
Author(s):  
Gary R. Graves
Keyword(s):  
Dendroica Caerulescens

scholarly journals Malarial parasites as geographical markers in migratory birds?

2006 ◽  
Vol 2 (2) ◽  
pp. 213-216 ◽  
Author(s):  
Sylvia M Fallon ◽  
Robert C Fleischer ◽  
Gary R Graves
Keyword(s):  
North America ◽  
Migratory Birds ◽  
Wide Distribution ◽  
Specific Information ◽  
Population Movements ◽  
Site Specific ◽  
Dendroica Caerulescens ◽  
Bird Populations ◽  
Breeding Populations ◽  
Wintering Range

We tested the hypothesis that malarial parasites ( Plasmodium and Haemoproteus ) of black-throated blue warblers ( Dendroica caerulescens ) provide sufficient geographical signal to track population movements between the warbler's breeding and wintering habitats in North America. Our results from 1083 warblers sampled across the species' breeding range indicate that parasite lineages are geographically widespread and do not provide site-specific information. The wide distribution of malarial parasites probably reflects postnatal dispersal of their hosts as well as mixing of breeding populations on the wintering range. When compared to geographically structured parasites of sedentary Caribbean songbirds, patterns of malarial infections in black-throated blue warblers suggest that host–malaria dynamics of migratory and sedentary bird populations may be subject to contrasting selection pressures.

Effects of forest–clearcut edges on a forest-breeding songbird

2002 ◽  
Vol 80 (6) ◽  
pp. 1026-1037 ◽  
Author(s):  
Rebecca J Harris ◽  
J Michael Reed
Keyword(s):  
Reproductive Success ◽  
Food Source ◽  
Forest Landscape ◽  
Resource Abundance ◽  
Neotropical Migrant ◽  
Dendroica Caerulescens ◽  
Forestry Practices ◽  
Forest Sites ◽  
Interior Forest ◽  
Negative Impacts

To understand local and regional changes in Neotropical migrant songbird populations it is important to determine whether forest-breeders can use and persist in the dynamic, variegated landscapes created by modern forestry practices. We made detailed observations of a species classified as a mature-forest specialist, the black-throated blue warbler (Dendroica caerulescens), adjacent to clearcut edges and in intact forest in a large industrial forest landscape. We measured reproductive success, habitat use, resource abundance, the potential for inter- and intra-specific competition, and predator densities. Unlike most studies of edge effects, our study showed both positive and negative impacts of associations with edges. We recorded a lower density of potential avian competitors within intact forest, as well as a higher proportion of older male black-throated blue warblers at interior forest sites. In addition, proportionally more fledglings were observed in intact forest. However, males at edge sites had higher pairing success and edges had higher understory density (which is positively associated with reproductive success in other studies), evidence of higher abundance of their primary food source and lower densities of diurnal egg and nestling predators. The net result of these mixed patterns is that males gaining a territory at edge or interior sites appeared to have similar probabilities of producing fledglings.

scholarly journals To Double-Brood or not? Individual Variation in the Reproductive Effort in Black-Throated Blue Warblers (Dendroica Caerulescens)

The Auk ◽  
2005 ◽  
Vol 122 (3) ◽  
pp. 902-914 ◽  
Author(s):  
Laura R. Nagy ◽  
Richard T. Holmes
Keyword(s):  
Food Availability ◽  
Individual Variation ◽  
Substantial Effect ◽  
Population Variation ◽  
Key Factors ◽  
Dendroica Caerulescens ◽  
Factors Influencing ◽  
First Clutch ◽  
Breeding Attempt ◽  
Second Clutch

AbstractIndividuals within a population vary in important fitness components, such as reproductive success. In general, females can maximize the number of young they produce by altering either the number of young per breeding attempt or the number of breeding attempts per season. In short-lived species, and especially in small passerine birds, number of breeding attempts per season varies markedly among individuals. Here, we evaluated factors influencing whether female Blackthroated Blue Warblers (Dendroica caerulescens) initiated additional nests after a successful breeding attempt (i.e. double-brooded). The percentage of females that laid a second clutch after successfully fledging a first brood ranged from 0 to 87% and averaged 53% (n = 7 years). Multiple logistic regression and AICc model selection indicated that double-brooded females bred in territories with greater food availability and produced heavier nestlings than single-brooded females. Female age, male age, date of first breeding attempt, and number of young in the first clutch were not included in the best-fit model. Older females, however, produced heavier fledglings, and females mated to older males occurred on territories with greater food availability, indicating that age contributed to individual variation in reproductive output. Because the proportion of females that produce multiple broods within a season can have a substantial effect on the annual fecundity of a population, variation among females and among the territories they occupy (i.e. habitat quality) are key factors influencing population dynamics in this and other multibrooded, shortlived species.Poner Nidadas Dobles o No? Variación Individual en el Esfuerzo Reproductivo en Dendroica caerulescens

scholarly journals Characters of Dendroica Cærulescens Cairnsi

The Auk ◽  
1897 ◽  
Vol 14 (1) ◽  
pp. 96-97
Author(s):  
Elliott Coues
Keyword(s):  
Dendroica Caerulescens

scholarly journals Testicular Volume and Asymmetry are Age-Dependent in Black-Throated Blue Warblers (Dendroica Caerulescens)

The Auk ◽  
2004 ◽  
Vol 121 (2) ◽  
pp. 473-485
Author(s):  
Gary R. Graves
Keyword(s):  
Sperm Competition ◽  
Testicular Volume ◽  
Directional Asymmetry ◽  
Left Testis ◽  
Extrapair Paternity ◽  
Dendroica Caerulescens ◽  
Julian Date ◽  
Age Dependent ◽  
Testicular Morphology ◽  
Older Males

Abstract Passerine birds are favored models for studies of sperm competition and extrapair paternity, yet the intraspecific chronology of testicular maturation and its empirical and theoretical consequences in avian mating systems have been largely ignored. I analyzed age-dependent variation in testicular morphology in 25 breeding populations of the Black-throated Blue Warbler (Dendroica caerulescens) distributed throughout its geographic range in eastern North America. Yearlings (first breeding season) had significantly smaller testes than older males (≥2 years). Latitude, altitude, and Julian date had negligible effects on testicular morphology when effects of core body size were controlled. Preparator effects had significant influence on the estimation of testicular volume and asymmetry. Contrary to Moller's hypothesis that the smaller testis compensates for deficiencies in the larger, the volumes of the left and right testes were positively correlated in both yearlings and older males. Older males exhibited a higher degree of directional asymmetry because of the disproportionate enlargement of the left testis. These data suggest that testicular morphology and reproductive capacities of yearling passerines may not be equivalent to those of older males. In a broader context, these findings demonstrate that age class should be factored into quantitative models of sperm competition in birds.

Black-throated Blue Warbler (Dendroica caerulescens)

2005 ◽  
Author(s):  
Richard T. Holmes ◽  
N. L. Rodenhouse ◽  
T. S. Sillett ◽  
Richard T. Holmes
Keyword(s):  
Dendroica Caerulescens

Habitat-Specific Demography of Breeding Black-Throated Blue Warblers (Dendroica caerulescens): Implications for Population Dynamics

10.2307/5721 ◽  
1996 ◽  
Vol 65 (2) ◽  
pp. 183 ◽  
Author(s):  
Richard T. Holmes ◽  
Peter P. Marra ◽  
Thomas W. Sherry
Keyword(s):  
Population Dynamics ◽  
Dendroica Caerulescens

Multiple Brooding and Productivity of a Neotropical Migrant, the Black-Throated Blue Warbler (Dendroica caerulescens), in an Unfragmented Temperate Forest

The Auk ◽  
1992 ◽  
Vol 109 (2) ◽  
pp. 321-333 ◽  
Author(s):  
Richard T. Holmes ◽  
Thomas W. Sherry ◽  
Peter P. Marra ◽  
Kenneth E. Petit
Keyword(s):  
Temperate Forest ◽  
Neotropical Migrant ◽  
Dendroica Caerulescens

Geographic Variation in the Mitochondrial Control Region of Black-throated Blue Warblers (Dendroica caerulescens)

The Auk ◽  
2009 ◽  
Vol 126 (1) ◽  
pp. 198-210 ◽  
Author(s):  
Wendy E. Grus ◽  
Gary R. Graves ◽  
Travis C. Glenn
Keyword(s):  
Geographic Variation ◽  
Control Region ◽  
Mitochondrial Control Region ◽  
Dendroica Caerulescens
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