The phrase "a decrease in fertility" is correct and usable in written English.
It can be used in contexts discussing biological, environmental, or social issues related to reproductive health or population dynamics.
Example: "The study revealed a significant decrease in fertility rates among women in urban areas over the past decade."
Alternatives: "a decline in fertility" or "a reduction in fertility".
The Journal does note that, historically, serious downturns have corresponded with a decrease in fertility, and times of prosperity with an increase.
Fiji's Bureau of Statistics explained the slow increase in the overall population as due to factors including high outward migration and a decrease in fertility levels.
We discover that GDP per capita has a negative relationship with fertility rates and a 1% increase in GDP per capita leads to a decrease in fertility by 2.1%.
This leads to a decrease in fertility, an increase in miscarriage and an increase in having a chromosomally abnormal baby (like Down syndrome) if pregnancy does occur.
Professor Joel Cohen at Rockefeller University recently wrote (in the journal Nature) that a decrease in fertility of one child per woman between now and 2050 alters the 9.1 billion estimate by 1.3 billion.
The population in England and other countries continues to age due to a decrease in fertility coupled with an increased life expectancy.
An increase in the expression of these knottins was observed after the acquisition of begomoviruses by whiteflies, supporting previous studies that showed a decrease in whitefly fertility, fecundity and longevity after begomovirus retention in the insect body [ 31].
This is reasonable because a decrease in the fertility barrier between parents makes it more likely that parental fertility types will introgress and form novel fertility types.
The country also experienced a decrease in the fertility rate of 6.2 children to 4.3 during the same period.
In line with this, a decrease in soil fertility was mentioned in Bougouni by 49%, 82% and 42% of farmers, settled pastoralists and transhumant herders, respectively.
In Brazil, an increase in life expectancy and a decrease in the fertility rate have led to a significant aging population.
