Population dynamics of large herbivores: variable recruitment with constant adult survival.

@article{Gaillard1998PopulationDO,
  title={Population dynamics of large herbivores: variable recruitment with constant adult survival.},
  author={Jean-Michel Gaillard and Marco Festa-Bianchet and Nigel Gilles Yoccoz},
  journal={Trends in ecology \& evolution},
  year={1998},
  volume={13 2},
  pages={
          58-63
        }
}
Recent long-term studies of population ecology of large herbivorous mammals suggest that survival of prime-aged females varies little from year to year and across populations. Juvenile survival, on the other hand, varies considerably from year to year. The pattern of high and stable adult survival and variable juvenile survival is observed in contrasting environments, independently of the main proximal sources of mortality and regardless of whether mortality is stochastic or density-dependent… Expand

Tables and Topics from this paper

Temporal Variation in Fitness Components and Population Dynamics of Large Herbivores
TLDR
In large-herbivore populations, environmental variation and density dependence co-occur and have similar effects on various fitness components and how that variability affects changes in population growth rates is examined. Expand
Temporal variation of juvenile survival in a long-lived species: the role of parasites and body condition
TLDR
This study shows that natural factors such as internal parasites may be a major source of variation in juvenile survival of a long-lived, migratory bird, which has implications for its population dynamics. Expand
Demographic performance of a large herbivore: effects of winter nutrition and weather
TLDR
The results suggested winter nutrition of maternal females may influence juvenile survival and demonstrates the importance of forage quality available to adult females during mid-pregnancy. Expand
Influence of Density and Climate on Population Dynamics of a Large Herbivore Under Harsh Environmental Conditions
TLDR
Dynamics of herbivore populations can be influenced both by density-dependent processes and climate, and demographic processes in this study appeared to be more affected by autumn and spring climate, in addition to population density, than by winter climate. Expand
Correlates of survival rates for 10 African ungulate populations: density, rainfall and predation
TLDR
Findings extend past generalizations about the demographic processes underlying the population dynamics of large mammalian herbivores and reveal how the survival rates of particular population segments respond differently to environmental influences. Expand
Comparative changes in adult vs. juvenile survival affecting population trends of African ungulates
TLDR
Annual survival rates were estimated for the juvenile, yearling and adult segments of nine ungulate species in South Africa's Kruger National Park and stage-specific survival rates appeared dependent on body mass, but with some anomalies. Expand
Variation of adult survival drives population dynamics in a migrating forest bat.
TLDR
Spring temperature and winter North Atlantic Oscillation explained maximally 9% each of the variation in first year and adult female survival, and the temporal variance of first-year survival was lower than that of adult survival. Expand
Territory acquisition mediates the influence of predators and climate on juvenile red squirrel survival.
TLDR
The results show how the timing of a life-history event like territory acquisition can directly affect survival and also mediate the effects of biotic and abiotic factors later in life, which engenders a better understanding of the fitness consequences of the timed events. Expand
Spatial variation buffers temporal fluctuations in early juvenile survival for an endangered Pacific salmon.
TLDR
It is concluded that spatial variation decreases interannual changes in overall juvenile production, which suggests that conservation and restoration of spatial diversity will improve population persistence for this metapopulation. Expand
Predation and reduced grazing interact to reduce recruitment and population growth in Black Brant
TLDR
The finding that recruitment is insufficient to maintain the breeding population results from both direct effect of predation on nests, primarily by Arctic foxes, and longer-term indirect effects of suchpredation on first-year survival of Black Brant. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 56 REFERENCES
Environmental stochasticity and population dynamics of large herbivores: a search for mechanisms.
  • B. Sæther
  • Biology, Medicine
  • Trends in ecology & evolution
  • 1997
TLDR
A thorough understanding of the mechanisms generating population fluctuations suggests that studies of ungulates will provide an important source for examining effects of long-term changes in the environment, for instance, resulting from a climatic change. Expand
Roe deer survival patterns: a comparative analysis of contrasting populations
TLDR
From two enclosed populations monitored for 13 and 11 years, time- and age-specific survival rates of roe deer were estimated in relation to age and study site by recent capture-mark-recapture methods, finding that females survived better than males, the survival rate of prime-age adults were the highest, and survival decreased after 7 years of age. Expand
An analysis of demographic tactics in birds and mammals
Using field data on fecundity, age at first reproduction and adult life expectancy, we reconsider the so-called r-K gradient by analyzing relationships between these three demographic parameters inExpand
Early survival in roe deer: causes and consequences of cohort variation in two contrasted populations
TLDR
Early survival of fawns was low and highly variable over the years at both Chizé and Trois Fontaines, and demonstrated marked variations between cohorts that need to be taken into account when modelling roe deer population dynamics. Expand
EFFECTS OF AGE, SEX, DISEASE, AND DENSITY ON SURVIVAL OF BIGHORN SHEEP
TLDR
The data support the suggestion that where hunters remove many males older than 5 yr of age, the natural mortality of males increases at 3–5 yr, possibly because young males suffer a mortality cost of participating in rutting activity. Expand
Effects of seasonally varying diet quality on collared peccary population dynamics — a simulation study
TLDR
Simulation of selected environmental conditions typical of south Texas, including a 12-month drought, and an 18-month wet period, suggests that changes in dietary CP can have a significant effect on population dynamics. Expand
Density‐Dependent Growth, Body Condition, and Demography in Feral Donkeys: Testing the Food Hypothesis
TLDR
Differences in rates of juvenile mortality are associated with nutritional status of lactating females, which is in turn determined by density-dependent competition for quality forage, which synchronize lactation with an annual flush ofquality forage at the onset of the monsoonal wet season. Expand
Demography of a large herbivore, the greater kudu Tragelaphus strepsiceros, in relation to rainfall
(1) The study was conducted from 1974 to 1984 in two areas of the Kruger National Park differing in mean rainfall. Age-class specific survival rates were estimated by individual registration of theExpand
Apparent demographic changes in black-tailed deer associated with wolf control on northern Vancouver Island
TLDR
A simple difference equation model was used to provide a perspective on demographic changes in a Columbian black-tailed deer population prior to and during wolf control on northern Vancouver Island. Expand
Culling regimes and sex ratio biases in Highland red deer
TLDR
Observed density-dependent changes in reproduction and survival in an unculled red deer population in the North Block of the Isle of Rum are used to model the responses of males and females to different levels of culling or predation. Expand
...
1
2
3
4
5
...