POPULATION STRUCTURE AND DYNAMICS
In my understanding, population
structure talks about what comprises a population in an area. For example: the
population in SU farm comprises plants, animals, and humans. But the plant,
animal, and human population is different.
According to the report of Floreynch,
a population has a limiting factor. These limiting factors may be food, water,
and other resources. There is a competition within the population for these
resources. This will affect the way how people in a population live, thus
bringing about the birth rate and death rate ratio. During the report, it is
mentioned that birth rates are greater compared to death rates. According to my
SoilSci 22 teacher, humans multiply exponentially while Agriculture increases
arithmetically. This would explain the rapid birth rates than the death rates.
In some countries like China, – I don’t know if it’s still a practice there –
old people are deemed useless and are therefore executed. But the Philippines
seem to value life more. Or is it just
an illusion? This could be another way of exploiting man’s resources, after
From the word “dynamics”, the word
“change” instantly comes to my mind. Population dynamics in my own words therefore,
is the dynamism of the population meaning, the constant change of a population
in terms of the number of people maybe or the trends present or anything that
changes the population’s state.
Perhaps my example for this would be
the population’s generation; from the old to the new, so to speak. The change
in trends in the population adheres to the people’s behavior due maybe to
social factors, environmental factors, and so on.
POPULATION’S ENERGETIC, BIOMASS, AND
I don’t understand the phrase at all so I made up that energy distribution
pyramid thing about the food web. I’ll talk about the energy distribution.
1 Energy Pyramid
this illustration, it is shown that the primary producers or the autotrophs get
100% energy from the sun. According to our past discussions in AnSci 11, the
plants store energy using the energy trap concept. The energy trap concept is
where the plants store energy from the sun where the consumers, particularly
the herbivores, of the producers get the stored energy.
In my understanding, the energy flow
in the ecosystem is reliant upon the interaction of the organisms present in a
certain area; the producers get 100% energy from the sun, the herbivores will
get 10% energy from the producers and so on.
An example of which is Silliman Farm.
Silliman Farm’s environment has a number of trophic levels ranging from grasses
to the apex predator, the humans, and decomposers. The energy pyramid has a
much similar illustration to the food chain but the energy pyramid shows the
energy percentage being taken.
The grasses, crops, and any plants in
the SU farm are obviously the producers while grasshoppers, toads/frogs, and
other insects are the herbivores or primary consumers. The secondary predators
are the animals in SU farm that do not eat producers but instead eat other
consumers like themselves. The apex predators are the humans who are called
omnivores that eat both producers and consumers. Lastly are the decomposers who
eat decomposing organisms. An addition to carnivores are the scavengers like
vultures who eat dead and rotting carcasses. These animals don’t feed on
According to Wiktionary, biomass is
the total mass of all living things within a specific area, habitat and et
cetera. In my underdstanding, figures and/or tables greatly explain a
population’s biomass. They are divided into the population’s specific
“contents” as what I would call it because I don’t know the other word.
For example: SU farm. If I was to take
the biomass of the farm’s animal project area, I am expected to segregate the
pigs, chickens, cows, and so on by percentage.