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BLOOD ISOTOPIC (δ13C AND δ15N) TURNOVER AND DIET-TISSUE FRACTIONATION FACTORS IN CAPTIVE DUNLIN (CALIDRIS ALPINA PACIFICA)
An exponential model described patterns of isotopic turnover for 13C and 15N, and turnover rates and half-lives of the two isotopes were correlated, confirming the assumption of synchronous patterns of turnover for those isotopes.
Signaling Individual Identity versus Quality: A Model and Case Studies with Ruffs, Queleas, and House Finches
An evolutionary model predicts that characters selected to signal individual identity will have properties differing from those expected for indicator signals of quality, which is illustrated in the ornamental, conspicuously variable, and sexually dimorphic breeding plumages of ruff sandpipers and red‐billed queleas.
Long-Term Decline in Body Size in a Snow Goose Population: Evidence of Environmental Degradation?
Goslings reared by individual adult females showed a decline in size over time, suggesting that the general decline reflects a non-genetic change in gosling growth rates during the fledging period, and this reduction in food availability may reflect over-exploitation of primary food plants by the geese.
Western sandpipers have altered migration tactics as peregrine falcon populations have recovered
- R. Ydenberg, R. Butler, D. Lank, Barry D. Smith, J. Ireland
- Geography, MedicineProceedings of the Royal Society of London…
- 22 June 2004
Changes in the behaviour of western sandpipers at migratory stopover sites over two decades are documented, and Comparisons between years, sites and seasons strongly implicate increasing danger from the recovery of peregrine falcons as a causal factor.
Body Size Variation in Lesser Snow Geese: Environmental Plasticity in Gosling Growth Rates
Goslings that grew more slowly due to the effects of hatch date or brood size were significantly smaller as adults, which may have a significant effect on various life history traits in this species.
Effects of Predation Danger on Migration Strategies of Sandpipers
We examine the potential selective importance of predation danger on the evolution of migration strategies of arctic-breeding calidrid sandpipers. Adult calidrids truncate parental care for reasons…
Trade-offs, condition dependence and stopover site selection by migrating sandpipers
It is inferred that calidrid sandpipers arriving in the Strait of Georgia with little fat remaining choose to take advantage of the high feeding rate at small sites like Sidney Island because they are less vulnerable to avian predators than are individuals with higher fat reserves, who instead elect to feed at large open sites like the Fraser estuary mudflats.
A supergene determines highly divergent male reproductive morphs in the ruff
It is shown that development into satellites and faeders is determined by a supergene consisting of divergent alternative, dominant and non-recombining haplotypes of an inversion on chromosome 11, which contains 125 predicted genes.
Genetic polymorphism for alternative mating behaviour in lekking male ruff Philomachus pugnax
It is shown that differential morph development is genetically controlled and consistent with a single-locus, two-allele autosomal genetic polymorphism and several potentially relevant environmental factors do not appear to alter behavioural development.