Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Infertility in Males

Infertility in Males

Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...

Infertility in Females

Infertility in Females

Female infertility is defined as the inability to conceive after a year of regular, unprotected intercourse and affects about 10–15% of couples worldwide. The primary cause of female infertility is ovulatory disorders, which hinder the release of eggs. These disorders can be classified as hypothalamic amenorrhea, polycystic ovarian syndrome (PCOS), premature ovarian failure, and hyperprolactinemic anovulation disorders.
Endometriosis, a condition characterized by abnormal growth of endometrial...

Population Growth

Population Growth

Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.However, realistic environmental conditions limit the number of...

Nondisjunction

Nondisjunction

Nondisjunction is the failure of homologous chromosomes or sister chromatids to separate correctly and move to the opposite poles of the cells. This produces daughter cells with abnormal chromosome numbers. Nondisjunction is common during anaphase I or anaphase II of meiosis. Mutations in synaptonemal complex proteins that attach homologous chromosomes increase the chances of nondisjunction in anaphase I of meiosis I. In contrast, mutations in topoisomerases and condensins that hold sister...

Applications of Life Tables

Applications of Life Tables

Life tables are versatile across various fields, providing a quantitative basis for analyzing mortality and survival rates. Whether used by demographers, actuaries, epidemiologists, or sociologists, life tables offer valuable insights into the dynamics of life and death, facilitating informed decisions in public health, insurance, conservation, and beyond. Their broad applicability highlights the interconnectedness of demographic data with practical outcomes in everyday life and strategic...

Conservation of Declining Populations

Conservation of Declining Populations

Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Subjective biology: how perceived fecundity influences relationship satisfaction and stability.

Journal of biosocial science·2026

Same author

Intrauterine Growth and Male Reproductive Health: A Follow-up Study From the Danish National Birth Cohort.

Andrology·2026

Same author

From early to fewer first births: ADHD and family formation among young adults.

Journal of epidemiology and community health·2026

Same author

Pubertal timing and tempo and depression risk in adolescent boys and girls: A Danish population-based cohort study.

Journal of affective disorders·2026

Same author

Infant Mortality Expectation and Fertility Behavior in Rural Malawi.

Demography·2026

Same author

Socioeconomic inequalities in life expectancy within and between native-born and foreign-born populations: a comparative study of 10 European countries.

International journal of epidemiology·2026

Search research articles

Related Experiment Video

Updated: Jun 21, 2026

Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization

Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization

Published on: October 24, 2025

Advances in development reverse fertility declines.

Mikko Myrskylä¹, Hans-Peter Kohler, Francesco C Billari

¹Population Studies Center, University of Pennsylvania, 3718 Locust Walk, Philadelphia, Pennsylvania 19104, USA.

|August 8, 2009

Summary

Global development historically lowered fertility rates. However, new research shows advanced development in the 21st century can reverse declining fertility, impacting population aging and socioeconomic concerns.

More Related Videos

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives

Published on: September 16, 2021

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Published on: March 25, 2021

Related Experiment Videos

Last Updated: Jun 21, 2026

Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization

Collection of Human Follicular Fluid, Follicle Somatic Cells, and Immature Oocytes from Individuals Undergoing In Vitro Fertilization

Published on: October 24, 2025

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives

Fertility Preservation Through Oocyte Vitrification: Clinical and Laboratory Perspectives

Published on: September 16, 2021

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Fertility Preservation in Patients with Severe Ovarian Dysfunction

Published on: March 25, 2021

Area of Science:

Demography
Socioeconomics
Global Health

Background:

The 20th century saw a strong negative correlation between economic/social development and human fertility rates.
Over half the global population now resides in regions with below-replacement fertility levels.
Rapid population aging and potential decline pose significant socioeconomic challenges.

Observation:

New cross-sectional and longitudinal analyses examined the total fertility rate and Human Development Index (HDI).
A fundamental shift in the development-fertility relationship was observed as the 21st century began.
While development still reduces fertility at lower HDI levels, it now increases fertility at advanced HDI levels.

Findings:

The previously established negative development-fertility link has transformed into a J-shaped curve.
The Human Development Index (HDI) is now positively associated with fertility in highly developed countries.
Further socioeconomic development can reverse fertility decline in advanced economies.

Implications:

This reversal has the potential to mitigate rapid population aging.
It may alleviate socioeconomic issues linked to persistent very low fertility.
Policy challenges related to demographic shifts may be re-evaluated.