What is the fecundity of humans?
Recognizing that there are many operational definitions of human fecundity, from a population research perspective, fecundity is defined as the biologic capacity to reproduce irrespective of pregnancy intentions, while fertility is demonstrated fecundity as measured by live births and sometimes stillbirths.
Is human fecundity declining?
Temporal trends in fecundity may also be determined by lifestyle attitudes related to behavioural and societal changes. The preponderance of data on sperm parameters and on time trends in fecundity seem to indicate that there has been no decline in sperm quality and couple fecundity so far.
What is the fecundity rate?
The meaning of fecundity is the reproductive rate (fecundity rate) or the performance of an individual or the population. In biology, what is the meaning of fecundity? Fecundity is the estimate of the number of gametes produced by an individual.
Why was early human fertility important?
It was the reason that in ancient times, generation of offspring was attributed to mothers (19). The old belief considered earth fertile, reproductive and nurturing like women, and all creatures were safe in her nurturing arms. Woman is the director of life, birth giver and feeder of the off-spring.
How does fecundity effect population growth?
Fecundity. As age structure suggests, some individuals within a population have a greater impact on population-level processes, such as growth. Fecundity describes the number of offspring an individual or a population is able to produce during a given period of time (Martin 1995) (Figure 4).
How is fecundity measured?
Fecundity is a measure of the number of offspring produced by an organism over time. It is also called the reproductive rate of an organism. Fecundity is measured by the number of offspring that are created successfully.
What does fecundity mean in biology?
Fecundity is the physiological maximum potential reproductive output of an individual (usually female) over its lifetime and represents one of the major cornerstones of theoretical and applied population biology. Fertility, a related concept, is defined as the current (actual) reproductive performance of an individual.
What is fecundity and examples?
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 medicine it refers to actual production of live offspring.
What is high fecundity?
Animals with high fecundity spend their energy in the production of many offspring that do not require much care. Alternatively, animals with low fecundity produce fewer offspring, and have more energy to care for those offspring.
What is fecundity in sociology?
Fecundity is the physiological capability of a woman, man, or couple to reproduce, that is, to produce a live birth. Unless both partners are fecund, no birth can occur. In contrast, fertility is the actual reproductive output of an individual, couple, or group.
What is difference between fertility and fecundity?
Fertility is the number of children born to a woman, while fecundity is her physiological potential to bear children. Fertility is often used as measure of fitness, and fecundity is related to reproductive value.
How does culture affect fertility?
Culture is significant in understanding human fertility rates in modifying sexual fertility by relating sex and reproduction to the culture’s value system. There is belief that cultural values are inextricably woven in decisions that favor or oppose programmes affecting sexual activity and fertility.
How does fertility depend upon fecundity?
Fecundity refers to the potential number of children that an average woman is able to give birth to. In other words, fertility is the actual output of reproduction, while fecundity is the potential output. Even though a woman has the ability to give birth to 20 children, she and her partner may choose to have only 1.
What is fecundity Brainly?
Answer: Explanation: Fecundity, in human demography and population biology, is the potential for reproduction of an organism or population, measured by the number of gametes (eggs), seed set, or asexual propagules. … A lack of fertility is infertility while a lack of fecundity would be called sterility.
What might be maximum fecundity for a woman and under which conditions?
Peak fertility occurs during just a few days of the cycle: usually two days before and two days after the ovulation date. This fertile window varies from woman to woman, just as the ovulation date often varies from cycle to cycle for the same woman.
What is a life history pattern?
The life history of a species is the pattern of survival and reproduction events typical for a member of the species (essentially, its lifecycle). Life history patterns evolve by natural selection, and they represent an “optimization” of tradeoffs between growth, survival, and reproduction.
What are three variables that affect life history?
The schedules of growth, reproduction, and mortality together determine the life history of a species.
What are the two life history patterns?
Long life patterns: (1) Common among organisms that live in stable environments. (2) These organisms typically reproduce and mature slowly, and are long lives. (3) They are large species environments.
What is life history in psychology?
Life history theory is a method of analysis in animal and human biology, psychology, and especially evolutionary sociobiology which postulates that many of the physiological traits and behaviors of individuals may be best understood in relation to the key maturational and reproductive characteristics that define the …
What factors affect life history?
Together, the age-, size-, or stage-specific patterns of development, growth, maturation, reproduction, survival, and lifespan define an organism’s life cycle, its life history. Figure 1: Diversity of life histories.
What is life history biology?
The life history of an organism is its pattern of survival and reproduction, along with the traits that directly affect survival and the timing or amount of reproduction.
What is fast life history?
A fast life history emphasizes current over future reproduction and is characterized by fast growth, early maturation and high reproductive effort at the cost of elevated mortality.
What is a slow life history?
Slow life histories describe those species that have slower growth, lower reproductive output, long gestation times, later ages at maturity, higher longevities (and thus longer generation times), larger body sizes, and lower population growth rates.
What is fast life history strategy?
Life history theories predict that organisms adopt a faster life history strategy, i.e. a higher investment in current as opposed to future reproduction, in response to several environmental factors.
What are r selected species?
r-selected species, also called r-strategist, species whose populations are governed by their biotic potential (maximum reproductive capacity, r). Such species make up one of the two generalized life-history strategies posited by American ecologist Robert MacArthur and American biologist Edward O.
How do the biotic and abiotic limiting factors of an ecosystem determine its carrying capacity?
Limiting factors determine carrying capacity. The availability of abiotic factors (such as water, oxygen, and space) and biotic factors (such as food) dictates how many organisms can live in an ecosystem. Carrying capacity is also impacted by the availability of decomposers.
What is AK strategist?
K-selected species, also called K-strategist, species whose populations fluctuate at or near the carrying capacity (K) of the environment in which they reside. Such species make up one of the two generalized life-history strategies posited by American ecologist Robert MacArthur and American biologist Edward O.
What is type2 survivorship?
A type II survivorship curve shows a roughly constant mortality rate for the species through its entire life. This means that the individual’s chance of dying is independent of their age. Type II survivorship curves are plotted as a diagonal line going downward on a graph.
What is a Type 3 organism?
The Type III curve, characteristic of small mammals, fishes, and invertebrates, is the opposite: it describes organisms with a high death rate (or low survivorship rate) immediately following birth.
What is mortality curve?
A graph that depicts the change in mortality rates throughout life.