Share This Author
Conservation of Grassland Birds in North America: Understanding Ecological Processes in Different Regions: "Report of the AOU Committee on Conservation"
The habitat requirements of birds in six types of grassland in six regions of North America were examined, finding heavy grazing by prairiedogs or bison created a low “grazing lawn” that is the preferred habitat for many grassland bird species that are restricted to the shortgrass prairie and desert grasslands.
Effects of Habitat Area on the Distribution of Grassland Birds in Maine
It is indicated that grasslands need to be approximately 200 ha in area if they are to be likely to support a diverse grass land bird fauna and conservation efforts seeking to protect habitat for rare grassland birds need to consider sites of at least 100 ha—and preferably 200 ha—in size.
Conservation of grassland birds in the western hemisphere
- P. Vickery, P. Tubaro, J. C. D. Silva, B. Peterjohn, J. Herkert, R. Cavalcanti
- Environmental Science
- 1 December 1999
“The sweeping vista of the world’ s natural grasslands-be they steppes, savannas, rangelands, punas or prairies-occupy nearly seven billion hectares; over half of the earth’ s land surface. Add to…
Evidence of incidental nest predation and its effects on nests of threatened grassland birds
Although nest predation was high (58.0% overall), its unpredictability probably limits the utility of certain antipredator behaviors by birds nesting at this site.
Use of a New Reproductive Index to Evaluate Relationship Between Habitat Quality and Breeding Success
A new method of measuring reproductive success is proposed that uses a composite of breeding-behavior observations (for behaviors that reflect different stages in the reproductive cycle) as an index of fitness, and is comprehensive in that it includes information on all monitored territories.
FLOOD TIDES AFFECT BREEDING ECOLOGY OF TWO SYMPATRIC SHARP-TAILED SPARROWS
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.
Ancestral polymorphisms in genetic markers obscure detection of evolutionarily distinct populations in the endangered Florida grasshopper sparrow (Ammodramus savannarum floridanus)
- N. Bulgin, H. Gibbs, P. Vickery, A. Baker
- Biology, Environmental ScienceMolecular ecology
- 1 April 2003
It is argued that despite the lack of phylogenetic distinctiveness of floridanus genotypes the observed genetic differentiation and previously documented phenotypic differences justify continued designation of this subspecies as a protected population segment.
RECENT ADVANCES IN GRASSLAND BIRD RESEARCH: WHERE DO WE GO FROM HERE?
IT'S NO SECRET anymore. Populations of many species of North American grassland birds are declining and have been declining for at least the last 30 years. According to the Breeding Bird Survey…
Landscape context influences salt marsh bird diversity and area requirements in New England
Is density an indicator of breeding success
-A new method of measuring reproductive success was used to test Van Horne's (1983) contention that reliance on population density as a measure of habitat quality can produce misleading results. None…