Mortality Patterns Suggest Lack of Senescence in Hydra

  title={Mortality Patterns Suggest Lack of Senescence in Hydra},
  author={Daniel E Martinez},
  journal={Experimental Gerontology},
  • D. Martinez
  • Published 1 May 1998
  • Environmental Science
  • Experimental Gerontology

Figures and Tables from this paper

Constant mortality and fertility over age in Hydra

Data show that 2,256 Hydra from two closely related species in two laboratories in 12 cohorts, with cohort age ranging from 0 to more than 41 y, have extremely low, constant rates of mortality, which falsifies the universality of the theories of the evolution of aging that all species deteriorate with age after maturity.

Slow life-history strategies are associated with negligible actuarial senescence in western Palaearctic salamanders

It is shown that salamanders have slow life histories and that they experience negligible senescence, suggesting that the absence ofsenescence may be a phylogenetically conserved trait.

Hydra, the everlasting embryo, confronts aging.

Investigation of the roles in Hydra of proteins involved in cellular stress responses in other organisms should provide insight into this issue and include the Hsp70 family proteins and the transcription factor FoxO.

Aging and Potential for Self-Renewal: Hydra Living in the Age of Aging - A Mini-Review

It is argued that under steady feeding and asexual reproduction Hydra species are able to escape aging as a result of high levels of cell proliferation and regenerative ability.

Senescence is not inevitable

Empirical data demonstrates that senescence may not be as universal a feature of life as once thought and that a diversity of demographic trajectories exists, indicating that a wide range of mortality and fertility trajectories is indeed possible.

Non-aging despite high mutation rate – genomic insights into the evolution of Hydra

Insight was gained into Hydra’s recent genetic evolution by genome sequencing of single cells and whole individuals and found evidence that Hydra evolution in captivity was accompanied and potentially accelerated by loss of heterozygosity.

Hydra, a powerful model for aging studies

Interestingly, this inducible aging phenotype is not observed in all H. oligactis strains, thus providing a powerful experimental model for investigations of the genetic control of aging.

Freshwater Cnidarian Hydra: A Long-lived Model for Aging Studies

On the immortal hydra. Again

  • A. Khokhlov
  • Medicine
    Moscow University Biological Sciences Bulletin
  • 2014
It is concluded that the applicability of the data obtained in gerontological experiments on hydra to human being is, unfortunately, very limited because normal functioning of many important organs and tissues in highly developed organisms is determined by the presence of postmitotic cells, which actually cannot be replaced.



The moulding of senescence by natural selection.

  • W. Hamilton
  • Environmental Science
    Journal of theoretical biology
  • 1966

Tissue dynamics of steady state growth in Hydra littoralis. I. Patterns of cell division.

Living fast and dying young: A comparative analysis of life‐history variation among mammals

This paper compares patterns of mortality from natural populations of mammals with a variety of life histories and finds that, after removing the effects of body weight, mortality is the best predictor of variation in life-history traits.

Tissue economics of hydra: regulation of cell cycle, animal size and development by controlled feeding rates.

Epithelial cell production and epithelial cell loss in 6 different size classes of Hydra attenuata were examined to understand the relationships between growth and morphogenesis. The sizes of adult

Bat longevity and metabolic rate

Longevity of captive mammals in Philadelphia Zoo

The effects of larger cages, improved facilities, and the use of antibiotics and vaccines representing further changes in the environment during the period from 1935-64 were analysed in relation to increased longevity.

Life History Traits of Two Chaetonotids (Gastrotricha) Under Different Experimental Conditions

The postparthenogenetic phase is remarkably long relative to the life cycle: this was observed in all experimental conditions and may be related to the existence of a second reproductive phase, which is hermaphroditic and follows the parthenogenetics one, as recently postulated from mor...

Cell cycle kinetics and development of Hydra attenuata. I. Epithelial cells.

The results indicate that more than 90% of hydra epithelial cells are actively proliferating with a cell cycle duration about equal to the tissue doubling time, and that the population of epithelium is self-sustaining requiring no input by differentiation from other cell types.

Selection for life span in Drosophila melanogaster

These experiments suggest that life span is either physiologically limited in that environment, or populations are unable to respond because either phenotype/genotype correlations are reversed, or genetic variation is suppressed.