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This data product provides summary information, by species, of changes in relative visibility of birds (phenology effects) through the April - July time period in which the North American Breeding Bird Survey (BBS) is conducted. Data are presented for 408 species of birds. Seasonal phenology effects are presented for selected latitudes and years, documenting changes in visibility and a variety of statistics to allow users to assess the significance of those effects. Results are presented as csv files, stored in zip files by first letter of the species common name and a single zip file containing csv files for 408 species. Links are provided to Child Items containing additional information in species-specific R...
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This data product provides summary information of changes in relative visibility of 408 species of North American birds (phenology effects) through the April - July time period in which the North American Breeding Bird Survey (BBS) is conducted. These phenology effects are presented for selected latitudes and years, documenting changes in visibility and a variety of statistics to allow users to assess the significance of those effects. Results are presented as R data sets as supplemental material to primary results presented as csv files.
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This data product provides summary information, by species, of changes in relative visibility of birds (phenology effects) through the April - July time period in which the North American Breeding Bird Survey (BBS) is conducted. Data are presented for 408 species of birds. Seasonal phenology effects are presented for selected latitudes and years, documenting changes in visibility and a variety of statistics to allow users to assess the significance of those effects. This Child Item is a supplement to the Sciencebase Data Release "Phenology effects in the North American Breeding Bird Survey," in which the results are presented in summarized graphical form in species-specific pdf files.
The consequences of climate change for ecosystem structure and function remain largely unknown. Here, I examine the ability of climate variation to explain long-term changes in bird and plant populations, as well as trophic interactions in a high-elevation riparian system in central Arizona, USA, based on 20 years of study. Abundances of dominant deciduous trees have declined dramatically over the 20 years, correlated with a decline in overwinter snowfall. Snowfall can affect overwinter presence of elk, whose browsing can significantly impact deciduous tree abundance. Thus, climate may affect the plant community indirectly through effects on herbivores, but may also act directly by influencing water availability...


    map background search result map search result map Phenology effects in the North American Breeding Bird Survey Phenology effects in the North American Breeding Bird Survey - Results by species in .rdata format Phenology effects in the North American Breeding Bird Survey- Results by species in pdf format Phenology effects in the North American Breeding Bird Survey Phenology effects in the North American Breeding Bird Survey - Results by species in .rdata format Phenology effects in the North American Breeding Bird Survey- Results by species in pdf format