Season of birth affects juvenile survival of giraffe

@article{Lee2017SeasonOB,
  title={Season of birth affects juvenile survival of giraffe},
  author={Derek E. Lee and Monica L. Bond and D. Bolger},
  journal={Population Ecology},
  year={2017},
  volume={59},
  pages={45-54}
}
Variation in timing of reproduction and subsequent juvenile survival often plays an important role in population dynamics of temperate and boreal ungulates. Tropical ungulates often give birth year round, but survival effects of birth season for tropical ungulate species are unknown. We used a population of giraffe in the Tarangire Ecosystem of northern Tanzania, East Africa to determine whether calf survival varied by season of birth. Variation in juvenile survival according to season of birth… 
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References

SHOWING 1-10 OF 99 REFERENCES
Does reproductive synchrony affect juvenile survival rates of northern mammals
TLDR
It is suggested that predation selects for tighter reproductive synchrony of snowshoe hares, at least while they are at peak densities, but that it has little effect on the timing of red squirrel reproduction.
Birthdate, mass and survival in mountain goat kids: effects of maternal characteristics and forage quality
TLDR
The results suggest that mountain goats are constrained to give birth in a short birth season synchronised with forage productivity, and a positive effect of mass on survival to 1 year when the sexes were pooled.
Controls over reproductive phenology among ungulates: allometry and tropical‐temperate contrasts
TLDR
The association between the timing of births and the onset of plant growth early in the growing season is less consistent among tropical savanna ungulate than among ungulates inhabiting northern temperate environments, and apparently subject to other influences affecting vegetation phenology.
Reproduction in the giraffe in relation to some environmental factors
Summary Environmental influences on reproduction in female giraffe were investigated by calculating conception dates for 123 calves and twenty foetal giraffe from the eastern Transvaal, South
Reproductive seasonality in African ungulates in relation to rainfall
TLDR
Global climate change could reduce the predictability of the timing of peak forage availability and quality based on meteorological cues, the length of time with adequate nutrition or both, and hence reduce reproductive success among tropical ungulates.
Timing and Synchrony of Ovulation in Red Deer Constrained by Short Northern Summers
TLDR
It is suggested that mothers unable to ovulate before a certain date fail to do so altogether that year, and that ovulation beyond acertain date incurs some fitness costs.
Factors affecting survival and cause-specific mortality of saiga calves in Mongolia
TLDR
The results point to both environmental and biotic factors affecting survival of juvenile saiga, suggesting that interannual variation in environmental conditions influenced twinning rates and body mass, and might play a key role in 1st-year survival.
Reproductive life history of Thornicroft’s giraffe in Zambia
TLDR
The lifetime reproductive success of giraffe is more dependent on longevity and calf survivorship than on reproductive rate, and it is concluded that the reussite of the vie reproductive d’une girafe depend davantage of sa longevite and of the survie des jeunes que du taux de reproduction.
WHAT DETERMINES PHENOLOGY AND SYNCHRONY OF UNGULATE BREEDING IN SERENGETI
TLDR
It is proposed that phenology of births (time of year) is determined by food supply, whereas birth synchrony (degree of coordination or spread) is an antipredator adaptation that functions in two different ways.
Trade-off between resource seasonality and predation risk explains reproductive chronology in impala
TLDR
The theory that impalas synchronize births in areas with a highly seasonal food supply, and temporally space births in less seasonal (equatorial) areas to reduce predation risks is supported.
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