A Stage‐Based Population Model for Loggerhead Sea Turtles and Implications for Conservation

@article{Crouse1987ASP,
  title={A Stage‐Based Population Model for Loggerhead Sea Turtles and Implications for Conservation},
  author={D. Crouse and L. Crowder and H. Caswell},
  journal={Ecology},
  year={1987},
  volume={68},
  pages={1412-1423}
}
Management of many species is currently based on an inadequate under- standing of their population dynamics. Lack of age-specific demographic information, particularly for long-lived iteroparous species, has impeded development of useful models. We use a Lefkovitch stage class matrix model, based on a preliminary life table developed by Frazer (1983a), to point to interim management measures and to identify those data most critical to refining our knowledge about the population dynamics of… Expand

Figures and Tables from this paper

Population modeling and implications for Caribbean hawksbill sea turtle management
TLDR
Inferences from sea turtle population models point particularly to the need for maintaining unusually high annual survival rates for both benthic juveniles and adults for currently depleted Caribbean hawksbill populations. Expand
Predicting the impact of Turtle Excluder Devices on loggerhead sea turtle populations
TLDR
A stage—based population model for loggerhead sea turtles (Caretta caretta) is modified and updated and used to project potential population—level effects of the use of turtle excluder devices (TEDs) in trawl fisheries of the southeastern US. Expand
An individual based model of a sea turtle population to analyze effects of age dependent mortality
TLDR
An individual based model to analyze the variability of extinction probabilities as a result of interacting mortalities at different life stages of a sea turtle population shows that the pelagic stage has a significant effect on population persistence. Expand
How much sea turtle bycatch is too much? A stationary age distribution model for simulating population abundance and potential biological removal in the Mediterranean
TLDR
Although the model assumes a stable population and provides only a rough estimate of abundance, these results suggest that the current bycatch level should be regarded as unsustainable for Mediterranean turtle populations. Expand
Using an individual-based model for assessment of sea turtle population viability
TLDR
Simulation results show that population persistence was most sensitive to fecundity and to survival at the pelagic juvenile stage, and a surprising finding is the relatively high importance of egg survival in terms of both hatching and hatchling success. Expand
Life‐history constraints on maximum population growth for loggerhead turtles in the northwest Atlantic
TLDR
Estimation of r max, while having some biases and uncertainty, encompassed values presently used in recovery planning for loggerhead turtles and offer additional information for the management of endangered and threatened species. Expand
Estimates of vital rates for a declining loggerhead turtle (Caretta caretta) subpopulation: implications for management
TLDR
These data provide managers with information specific to this subpopulation that can be used to develop recovery plans and conduct subpopulation-specific modeling exercises explicit to the challenges faced by turtles nesting in this region. Expand
A stage-based matrix population model of invasive lionfish with implications for control
TLDR
A stage-based, matrix population model in which matrix elements were comprised of lower-level parameters revealed that population growth rate is most influenced by larval mortality; elasticity analysis of the matrix indicated strong influence of the adult and juvenile survival elements. Expand
Establishing Reference Demography for Conservation: A Case Study of Macrochelys temminckii in Spring Creek, Georgia
TLDR
It is suggested that the population parameters described at Spring Creek are the best approximation of reference demographic conditions for Macrochelys to date, and this study provides a general framework applicable for large, long-lived, endangered turtle species for which demographic data are unavailable. Expand
Somatic growth function for immature loggerhead sea turtles , Caretta caretta , in southeastern U . S . waters
Somatic growth functions are critical parameters for understanding the life history of a species and for developing management plans for wild populations. Substantial effort has been invested in—andExpand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 43 REFERENCES
Population Growth Rates and Age Versus Stage-Distribution Models for Teasel (Dipsacus Sylvestris Huds.)
TLDR
Mathematical models are developed to examine the population—level response of an herbaceous plant species (teasel), which was experimentally introduced into several habitats and monitored for 5 yr. Expand
THE POPULATION BIOLOGY OF CHAMAELIRIUM LUTEUM, A DIOECIOUS MEMBER OF THE LILY FAMILY: TWO-SEX POPULATION PROJECTIONS AND STABLE POPULATION STRUCTURE'
TLDR
Comparison of observed size distribution and sex composition with projected stable populations indicated that the populations studied are near a stable structure and should show only modest changes in population size from year to year, in accord with one's expectations for a long-lived species growing in an ecologically stable habitat. Expand
The Conservation of Sea Turtles: Practices and Problems
TLDR
Until unequivocal data become available, turtle conservationists should continue to pursue common sense or logically sound restoration programs, but should constantly re-evaluate their actions in the light of the latest available knowledge and modify or desist from current approaches as necessary. Expand
Nesting Activity of the Loggerhead Turtle (Caretta caretta) in South Carolina I: A Rookery in Transition
TLDR
Nesting activity on Kiawah Island is undergoing development as a resort, but the builders have followed many of the management recommendations established relative to Caretta, and indicates that prudent beach development need not inhibit reproduction by Caretta. Expand
Nesting frequency and success: implications for the demography of painted turtles
TLDR
Nesting ecology and reproduction of painted turtles (Chrysemys picta) in southeast Michigan were intensively studied from 1975 to 1978 and data indicate that from 30 to 50% of the females possibly do not reproduce every year and that approx. Expand
The ecology and migrations of sea turtles. 7, The West Caribbean green turtle colony. Bulletin of the AMNH ; v. 162, article 1
TLDR
A unique contribution of the report is an extensive record of remigratory cycle-shifts, and tables showing composition of the nesting colonies of 1962-1972 with respect to past and future remigration-interval The ecology and migrations of sea turtles. Expand
Some Aspects of the Nesting Behavior and Reproductive Biology of Sea Turtles
TLDR
The relatively large number of yolkless eggs laid by many leatherbacks and by some hawksbills invites further study and some aspects of sea turtle nesting behavior and reproduction are compared to those of other chelonians. Expand
Modulated Reproductive Periodicity in Chelonia
After 15 yr tagging at the nesting ground of Chelonia mydas at Tortuguero, Costa Rica, 447 remigration returns have been recorded. These confirm previous indications that some Tortuguero femalesExpand
The Evolutionary and Mathematical Demography of the Turtle Chrysemys picta
TLDR
A mark—recapture study of a population of painted turtles, Chrysemys picta, started by O. J. Sexton between 1953 and 1957 and continued between 1968 and 1973, interpreted as an adaptation to a highly uncertain probability of nest success and an effective predator defense in the adult stage. Expand
On the Growth of the Loggerhead Turtle, Caretta caretta, under Rearing Conditions
The present study was carried out to resolve the growing phases of the Loggerhead Turtle, Caretta caretta (Linne), which were raised from just hatch out stage to the 4.5 years old in the Aquarium,Expand
...
1
2
3
4
5
...