Home Range Sizes and Habitat Use of Nelson's and Saltmarsh Sparrows

@inproceedings{Shriver2010HomeRS,
  title={Home Range Sizes and Habitat Use of Nelson's and Saltmarsh Sparrows},
  author={W. Gregory Shriver and Thomas P. Hodgman and James P. Gibbs and Peter D. Vickery},
  year={2010}
}
Abstract Nelson's (Ammodramus nelsoni) and Saltmarsh (A. caudacutus) sparrows are sympatric breeders in tidal marshes of the southern Gulf of Maine. These sparrows hybridize, have different mating strategies, and males do not defend territories or provide parental care. We estimated and compared core area sizes, home range sizes, and habitat use between species and between males and females. We radio-marked 140 sparrows (63 Nelson's and 77 Saltmarsh sparrows) during three breeding seasons (1999… 
Mercury levels of Nelson’s and saltmarsh sparrows at wintering grounds in Virginia, USA
TLDR
A comparison of stable isotopes of nitrogen and carbon suggests that the higher exposure of saltmarsh sparrows may be not due to feeding at a higher trophic level, as previously hypothesized, but rather could be related to a difference in the carbon source at the base of each species’ food chain.
Annual variation in the offspring sex ratio of Saltmarsh Sparrows supports Fisher's hypothesis
TLDR
The finding of a 1:1 offspring sex ratio and interannual variation in offspring and adult sex ratios in a wild bird population is more consistent with the predictions of Fisher (1930) than with those of Trivers and Willard (1973).
Apparent Forced Mating and Female Control in Saltmarsh Sparrows
TLDR
The results of an observational study of mating and agonistic behavior of individually marked breeding birds in New York found no evidence of male mating aggregations, and male aggressive behavior was prevalent only in male-initiated sexual interactions.
Perception of the Horizon Predicts Bird Abundance Better Than Habitat Patch Size in a Tidal Marsh Species of Conservation Concern
The Saltmarsh Sparrow (Ammodramus caudacutus) is a tidal marsh bird species facing rapid population decline throughout its range. A major cause of this decline is degradation and loss of breeding
Estimates of breeding season location for 4 mesic prairie bird species wintering along the Gulf Coast
ABSTRACT During the last 2 centuries, widespread declines have been observed in migratory species, and these declines have largely been linked to anthropogenic causes. Migrants move across multiple
Habitat openness and edge avoidance predict Saltmarsh Sparrow abundance better than habitat area
ABSTRACT The Saltmarsh Sparrow (Ammospiza caudacuta) is a tidal marsh bird facing rapid population decline throughout its range, largely caused by degradation and loss of breeding habitat. Thus,
Relationship of phenotypic variation and genetic admixture in the Saltmarsh–Nelson's sparrow hybrid zone
TLDR
It is concluded that the discrimination of pure and hybrid individuals is not possible in the absence of genetic data, which has implications for conservation of pure populations, as extensive backcrossing throughout the hybrid zone may present challenges for monitoring pure species identified by morphology alone.
Timing of migration and prebasic molt in tidal marsh sparrows with different breeding strategies: Comparisons among sexes and species
TLDR
Observations in sympatric Saltmarsh Sparrows and Seaside Sparrows support the hypotheses that breeding strategies can influence arrival timing and that reproductive investment can have carryover effects on molt and departure.
Consequences of breeding system for body condition and survival throughout the annual cycle of tidal marsh sparrows
TLDR
Although the authors observed variation in body condition, within-season survival was uniformly high in both seasons, suggesting that sex, species, season, body size, and body condition have little impacts on within season survival.
Male-Skewed Sex Ratio in Saltmarsh Sparrow Nestlings
TLDR
The Saltmarsh Sparrow appears to be an exception to the pattern typical of birds, in which the population of adults is skewed toward males but the sex ratio of offspring is balanced, and future age-specific population projections for this species of high conservation concern are refined.
...
...

References

SHOWING 1-10 OF 24 REFERENCES
Differential habitat use by Acadian Nelson's sharp-tailed sparrows: implications for regional conservation
Nelson's Sharp-tailed Sparrows (Ammodramus nelsoni) that breed along the Atlantic coast of North America (Acadian subspecies subvirgatus) are considered saltmarsh specialists. However, these sparrows
HOME-RANGE SIZE, RESPONSE TO FIRE, AND HABITAT PREFERENCES OF WINTERING HENSLOW'S SPARROWS
TLDR
It is recommended that a biennial, rotational burn regime is maintained to maintain habitat characteristics correlated with Henslow's Sparrow abundance, but seed density best predicted HensLow's Sparrow numbers.
Nesting ecology of Saltmarsh Sharp-tailed Sparrows in a tidally restricted salt marsh
TLDR
It is hypothesize that restoration efforts will have short-term negative impacts on Saltmarsh Sharptailed Sparrow populations until salt marsh habitats are restored in higher sections of the marsh.
Home range and survival characteristics of male Bachman's Sparrows in an old-growth forest managed with breeding season burns
TLDR
The results suggest that breeding season burns were not as detrimental to Bachman's Sparrows as reported at other locations, and such burns may be helpful in maintaining suitable habitat.
SITE FIDELITY, PHILOPATRY, AND SURVIVAL OF PROMISCUOUS SALTMARSH SHARP-TAILED SPARROWS IN RHODE ISLAND
TLDR
Lack of gender-bias in adult dispersal and strong natal philopatry of sparrows in Rhode Island occurs regularly among passerines possessing a variety of mating systems, and adult male Saltmarsh Sharp-tailed Sparrows exhibited apparent survival rates similar to adult females.
How Well can We Model Numbers and Productivity of Saltmarsh Sharp-Tailed Sparrows (Ammodramus Caudacutus) Using Habitat Features
TLDR
Although this study identifies several new factors influencing habitat selection in Saltmarsh Sharp-tailed Sparrows, it highlights the need to be cautious when making predictions from habitat models and indicates that nesting activity is determined more by plant compositions that indicate subtle variations in marsh elevation.
THE BOTTERI'S SPARROW AND EXOTIC ARIZONA GRASSLANDS: AN ECOLOGICAL TRAP OR HABITAT REGAINED?
TLDR
Far from being an ecological trap, the exotic lovegrasses apparently are providing essential cover for the Botteri's Sparrow in Arizona, perhaps allowing it to regain an abundance similar to what existed regionally prior to overgrazing of the late 19th Century.
NEST SITE SELECTION AND NESTING SUCCESS IN SALTMARSH BREEDING SPARROWS: THE IMPORTANCE OF NEST HABITAT, TIMING, AND STUDY SITE DIFFERENCES
TLDR
It is indicated that nest flooding is a major threat to successful reproduction in both species, but they have different strategies to avoid flooding.
A Comparative Study of the le Conte's and Sharp-Tailed Sparrows
TLDR
The present study examines the relationships between the Le Conte's Sparrow and the Sharp-tailed Sparrow to show how its sympatric relatives have influenced selection in the wide-ranging Sharptailed Sparrow.
FLOOD TIDES AFFECT BREEDING ECOLOGY OF TWO SYMPATRIC SHARP-TAILED SPARROWS
TLDR
It is shown that Saltmarsh Sharp-tailed Sparrow males were nonterritorial and promiscuous and provided no parental care to young, and adaptation to tidal flooding partially explains the evolution of the unique Saltm Marsh Sharp-tails Sparrow mating system.
...
...