Female red squirrels fit Williams' hypothesis of increasing reproductive effort with increasing age.

Female red squirrels fit Williams' hypothesis of increasing reproductive effort with increasing age. Research Abstract Details 

Research Abstract Table of Contents

Jump to the:

Female red squirrels fit Williams' hypothesis of increasing reproductive effort with increasing age. Abstract Text:

Descamps,Stan Boutin,Dominique Berteaux,Jean-Michel Gaillard, Descamps,Stan Boutin,Dominique Berteaux,Jean-Michel Gaillard, Descamps,Stan Boutin,Dominique Berteaux,Jean-Michel Gaillard,

Williams predicted that reproductive effort should increase as individuals age and their reproductive value declines. This simple prediction has proven difficult to test because conventional measures of energy expenditure on reproduction may not be a true reflection of reproductive effort. We investigated age-specific variation in female reproductive effort in a stable population of North American red squirrels where energy expenditure on reproduction is likely to reflect actual reproductive effort. We used seven measures of reproductive effort spanning conception to offspring weaning. We found that females completed growth by age 3 and that reproductive value decreased after this age likely because of reproductive and survival senescence. We therefore, predicted that reproductive effort would increase from age 3 onwards. The probability of breeding, litter mass at weaning, and likelihood of territory bequeathal were all lower for 1- and 2-year-old females than for females older than 3 years, the age at which growth is completed. That growing females are faced with additional energetic requirements might account for their lower allocation to reproduction as compared with older females. The probability of attempting a second reproduction within the same breeding season and the propensity to bequeath the territory to juveniles increased from 3 years of age onwards, indicating an increase in reproductive effort with age. We think this increase in reproductive effort is an adaptive response of females to declining reproductive values when ageing, thereby supporting Williams' prediction.

Female red squirrels fit Williams' hypothesis of increasing reproductive effort with increasing age. Publishing Authors By Initials

S Descamps,S Boutin,D Berteaux,JM Gaillard,S Descamps,S Boutin,D Berteaux,JM Gaillard,S Descamps,S Boutin,D Berteaux,JM Gaillard,

For similar abstracts research abstracts see: abstracts research

PUBMED ID PMID:

MEDLINE DATE:

Female red squirrels fit Williams' hypothesis of increasing reproductive effort with increasing age. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: The Journal of animal ecology

VOLUME: 76

Page Numbers: 1192-201

Journal Abbreviation:

ISSN: 0021-8790

DAY: 9

MONTH: Nov

YEAR: 2007

Female red squirrels fit Williams' hypothesis of increasing reproductive effort with increasing age. Information

Number of References:

LANGUAGE: eng

NlmUniqueID: 376574

Female red squirrels fit Williams' hypothesis of increasing reproductive effort with increasing age. Keywords Mesh Terms:

KEYWORDS:

MESH TERMS:

Chemical & Substance for Abstract: Female red squirrels fit Williams' hypothesis of increasing reproductive effort with increasing age. Information

Substance Name:

Registry Number:

Grant and Affiliation Information for Female red squirrels fit Williams' hypothesis of increasing reproductive effort with increasing age.

AFFILIATION: Chaire de Recherche du Canada en Conservation des Ecosystèmes Nordiques et Centre d'Etudes Nordiques, Université du Québec à Rimouski, 300 allée des Ursulines, Rimouski, Québec G5L3A1, Canada.

Country: England

AGENCY:

GRANT:

ACRONYM:

MEDLINETA: J Anim Ecol

REFSOURCE:

DATABASENAME:

ACCESSION NUMBER:

Number Hits: 0

Female red squirrels fit Williams' hypothesis of increasing reproductive effort with increasing age Related Publications

• A case control study of potential enteric pathogens for calves raised in cow-calf herds.
• Conserving biodiversity using patent law.
• Epoetin alfa in critically ill patients.
• Female red squirrels fit Williams' hypothesis of increasing reproductive effort with increasing age.
• Heterotopic, not homotopic, fetal occipital allografts in adult hosts project to visual-related extracortical targets.
• Infantile familial encephalopathy with cerebral calcifications and leukodystrophy.
• Mechanisms of Disease: erythropoietin resistance in patients with both heart and kidney failure.
• Prevention of Staphylococcus aureus graft infection by a new gelatin-sealed vascular graft prebonded with antibiotics.
• Self-assembly of unprecedented swollen multilamellar twisted ribbons from a racemic hydroxy fatty acid.
• [A further case of dysgenetic cyst of the hyomandibular region]
• [Albanian nurses on the arrival of autonomy]
• [Association of tuberculosis and thyroid cancer. Value of exploratory cervicotomy]
• [Cancer of the maxilla and immediate bilateral cervical adenopathy]
• [Classification of sleep disorders]
• [Considerations on liver abscess; 24 surgical cases in Indochina.]
• [Esophageal peptic syndrome. Clinical data]
• [In Process Citation]
• [In Process Citation]
• [Mycobacterium infections of the lymph nodes of the neck]
• [Not Available.]
• [Not Available.]
• [Not Available.]
• [Not Available.]
• [Not Available.]
• [Peritoneal homografts in tympanoplasty. Our 1st results]
• [Prosthetic care following mastectomy. A real contribution to quality of life]
• [Radioisotope exploration of the salivary glands with 99 M technetium during facial paralysis]
• [Recent aspects in therapy of sleep disorders (author's transl)]
• [Regression phenomena in adults who find themselves again in a student situation]
• [Very late esophageal stenosis in cancer of the breast. 4 new cases]