1,094 research outputs found
San Diego Audubon Society\u27s Protecting & Enjoying Our Nearby Nature
A case for supporting the San Diego Audubon Society in protecting and enjoying nearby nature.https://digital.sandiego.edu/npi-bpl-fundraising/1000/thumbnail.jp
Cause-Effect Linkages 2: Symposium Abstracts, September 27-28, Grand Traverse Resort, Traverse City, Michigan
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Bird Wintering Ranges
This study examines the changes in winter ranges of North American birds from the winters of 1966-1967 thru 2013
Report to the Casco Bay Estuary Partnership for habitat restoration conducted under a grant from the Casco Bay Habitat Restoration Fund: Outer Green Island [2006 Season]
FIFTH ANNUAL REPORT OF THE AUDUBON SOCIETY OF SOUTH CAROLINA FOR NINETEEN FIFTEEN
Annual report of the Audubon Society of South Carolina for 1915 discusses educational work performed across the state by the organization in the previous year, including exhibits, symposiums, and lectures. Report also includes membership information
Table 1: Details of datasets used to evaluate the form of the species abundance distribution.
Temporal shifts and temperature sensitivity of avian spring migratory phenology:A phylogenetic meta-analysis
There are wide reports of advances in the timing of spring migration of birds over time and in relation to rising temperatures, though phenological responses vary substantially within and among species. An understanding of the ecological, life-history and geographic variables that predict this intra- and interspecific variation can guide our projections of how populations and species are likely to respond to future climate change.
Here, we conduct phylogenetic meta-analyses addressing slope estimates of the timing of avian spring migration regressed on (i) year and (ii) temperature, representing a total of 413 species across five continents. We take into account slope estimation error and examine phylogenetic, ecological and geographic predictors of intra- and interspecific variation.
We confirm earlier findings that on average birds have significantly advanced their spring migration time by 2·1 days per decade and 1·2 days °C−1. We find that over time and in response to warmer spring conditions, short-distance migrants have advanced spring migratory phenology by more than long-distance migrants. We also find that larger bodied species show greater advance over time compared to smaller bodied species. Our results did not reveal any evidence that interspecific variation in migration response is predictable on the basis of species' habitat or diet.
We detected a substantial phylogenetic signal in migration time in response to both year and temperature, suggesting that some of the shifts in migratory phenological response to climate are predictable on the basis of phylogeny. However, we estimate high levels of species and spatial variance relative to phylogenetic variance, which is consistent with plasticity in response to climate evolving fairly rapidly and being more influenced by adaptation to current local climate than by common descent.
On average, avian spring migration times have advanced over time and as spring has become warmer. While we are able to identify predictors that explain some of the true among-species variation in response, substantial intra- and interspecific variation in migratory response remains to be explained
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