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The specific problem is: due to unclear definitions for fertility, fecundity and derivative terms depending on whether the term is being used in demography, epidemiology or clinical medicine. For example fecundity is the potential to for a female to become pregnant and carry that pregnancy to a live birth in demography, while in clinical ...
Fecundity selection, also known as fertility selection, is the fitness advantage resulting from selection on traits that increases the number of offspring (i.e. fecundity). [1] Charles Darwin formulated the theory of fecundity selection between 1871 and 1874 to explain the widespread evolution of female-biased sexual size dimorphism (SSD ...
In demographic contexts, fertility refers to the actual production of offspring, rather than the physical capability to reproduce, which is termed fecundity. [ 1 ] [ 2 ] [ 3 ] The fertility rate is the average number of children born during an individual's lifetime.
For example, imagine two species—an iteroparous species that has annual litters averaging three offspring each, and a semelparous species that has one litter of four, and then dies. These two species have the same rate of population growth, which suggests that even a tiny fecundity advantage of one additional offspring would favor the ...
In the U.S., approximately 12.7% of reproductive age women seek infertility treatment every year. But that statistic excludes men with infertility issues, which is just one of many reasons actual ...
For example, a person may weigh 170 pounds and have a body composition of 20 percent body fat, 12 percent bone, and 68 percent lean tissue mass. This means their body is made up of 34 pounds of ...
For example, organic bananas might carry the code "94011" instead of just "4011." However, the code itself is not a formal certification tool. In the United States, that is regulated by the U.S ...
There is little advantage in adaptations that permit successful competition with other organisms, because the environment is likely to change again. Among the traits that are thought to characterize r-selection are high fecundity, small body size, early maturity onset, short generation time, and the ability to disperse offspring widely.