Ecology
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(To get started, here are a few basic terms to know)
Ecology
The scientific study of how organisms
interact with their environment
and all the other organisms that live in that
environment.
Ecosystem
All the living and
nonliving things that interact in a particular area.
( Ecosystems can be as small as a pond or a
large as a desert.)
Habitat
The place where an
organism lives and that provides the things the organism
needs.
A single ecosystem might contain many habitats. Organisms live in different habitats because
they have different requirements for survival.
Each organism has a role to play in the
habitat, a role which is referred to as its Niche.
The Niche an organism fills in a habitat is not
limited to its place in
a food web.
Plants provide nesting sites as well as food.
Generally, no two species will fill
exactly the same niche in a habitat
Organism-
A single individual animal, plant, fungus or other living
thing.
Population-All
the members of one species in a particular area .
The maximum number of individuals in a population that an
ecosystem can support
is called Carrying
Capacity.
Community -Most ecosystems contain
more than one type of organism.
A community is a group of
different populations that live close enough together to
interact.
One way they might interact is by using the same resources,
such as food and shelter.
Biome- A biome describes
in general terms the climate and types of plants found in
similar places around the world.
Limiting
Factors
Environmental factors that prevent a population from
increasing.
Some limiting factors for populations are food,
space and weather
conditions. ALSO, air,
light and water.
Other
limiting factors might be the number of other organisms of the same
population living in an area.
All ecosystems are basically made of two parts.
The Living and the Non-Living.
Biotic Factors- are the living parts of an ecosystem.
Abiotic Factors- are the nonliving parts of an ecosystem.
(Water,
Sunlight, Oxygen, Temperature, Soil)
Water
All living things need water.
Plants need it and
sunlight to
carry out photosynthesis,
Animals need it
to digest
food and release energy stored in food.
Ecosystems with a lot of
water can
support a large number of plants, and
these plants can support
a
large number
of different types of animals.
Sunlight
It’s necessary for photosynthesis.
If the plants don’t
get it
they can’t survive.
The
strength
ofthe sunlight and amount of sunlight
will determine
the type of
plants that can survive
No plants means no
food for other
organisms.
It also warms the Earth’s surface.
It’s also a
factor in ocean ecosystems because
the deeper the water,
the less light will be available.
In shallow water near the shore there
will be more plant growth
and therefore more food than in deeper parts of the ocean.
Oxygen
Most living things require oxygen to
carry out their
life processes.
Temperature
The temps that are typical of an area
determines the types of organisms
that can live there.
Soil is a mixture of small rock and mineral particles,
nutrients, air, water and the
decaying remains of living things.
The type of soil
influences the
kind of plants that can grow in an
ecosystem. Some animals use the soil as a home.
Billions
of microscopic organisms such as bacteria
may also live in the
soil.
Ecosystems are quite important to understand.
We are simply another member of our ecosystem.
We have the ability to protect these valuable
things,
if we act soon enough to preserve them before too
much damage is done.
If we are successful in protecting THEM we end up
protecting
US! Since we're a part of the environment, anything
we do
do help IT ends up helping US as well!
Matter and Energy both flow through ecosystems.
Matter and
energy are also recycled through this process. We'll
look at how both matter
and Energy move through these important parts of our
environment.
Energy Flows through Ecosystems:
Energy from the sun is a precious thing.
Every living thing needs energy, and living
things can be put into one of three categories, based upon how
they
get the energy that they need.
In every ecosystem, there are three main energy roles.
These roles describe how an organism obtains the energy it needs
to live.
Producers-are
organisms that capture energy and store it in food as chemical
energy.
Producers make
energy available to all other living parts of the ecosystem.
Plants,
algae
and certain other microorganisms.
Producers can
make their own food.
Sunlight usually,
but not always, provides the energy to the producers.
Consumers-
are organisms that get their energy by eating, or consuming,
other organisms.
Consumers are usually
classified
by what they eat.
Herbivores-eat only plants
Carnivores-eat
only animals
Scavengers-a
carnivore that feeds on the bodies of dead organisms.
Omnivores -eat both
plants and animals
Decomposers-
organisms that break down dead plant and animal matter into
simpler
compounds. They
break down
waste and dead organisms and return the raw
materials to the environment.
(Which
can be then used by other organisms)
Bacteria and Fungi are the
major
groups of decomposers.
Think what would happen
without
decomposers?
Matter Cycles
Through Ecosystems too.
Cycle- A series
of events that happens over and over again.
The Water Cycle
Water is stored in lakes, rivers and oceans.
Water is
found underground in the spaces between soil particles and
cracks in
rocks.
Water is stored in glaciers and polar ice sheets.
Water is also part of the bodies of living things.
Water isn’t
just stored.
It’s constantly moving
among these areas.
This movement of
water through the environment is called the Water Cycle.
The Hydrologic Cycle (Water Cycle) is also responsible for
purifying Earth's
water supplies.
The process of
Evaporation occurs when liquid water turns to water
vapor.
This happens when heat is added to liquid water. When
water evaporates, ONLY the H2O turns to
water vapor.
Anything else
(impurities, salt, whatever...) is left behind.
Water vapor
returns to liquid state when it LOSES HEAT.
This process is
called Condensation.
Finally, the liquid, or frozen water falls to the
Earth as Precipiation.
This precipitation may
flow over Earth's surface as Surface Runoff.
Surface Runoff often follows the same path, and when
this
happens, it forms Rivers and Streams.
Precipitation may also sink
into the pore spaces found between particles of soil.
When this
happens, it's called Groundwater.
Both Surface Runoff and Groundwater eventually makes it
way back
to the sea, where it will eventually be evaporated into
the atmosphere
once again.
Perhaps instead it evaporates somewhere along the
way
back into the atmosphere,
perhaps it's used by other living
things along the way,
or perhaps used by plants and returned to the
atmosphere through Transpiration.
This
process has been going on since water first formed on
Earth,
nearly five billion years ago!
Think of it...the water that you
use today,
has undoubtedly been used many, many times before,
by many,
many creatures which existed on Earth before you came
along.
Wouldn't it be interesting to know what, or who,
previously used
those very same water molecules that you just consumed?
You're
not the first to use those same molecules, and you
certainly won't be
the last.
With every sip you take,
you're part of a very old
series of events indeed.
Events that have gone on, and will
continue, well beyond the short number of years you're
here on Earth.
The Carbon
Cycle
All living
things on
Earth are built with the Carbon atom.
We're carbon based life
forms!
This important atom
called Carbon is also recycled here on
Earth.
If it were not, you
wouldn't be here reading this right
now,
since all the carbon would
have been used up long, long ago.
The carbon cycle involves two important processes.
Photosynthesis
and Respiration.
Photosynthesis is the
process that green plants
use to make food.
Remember that the major
difference between
plants and animals is just that..
.Plants can make their own
food using
the process of Photosynthesis.
Animals have to find
their food
and eat it.
Using sunlight, and some
water, and a few compounds
like Chlorophyll,
plants are able to basically
break a CO2
molecule into a Carbon atom,
which is used to build
starches and sugars
by the plant, and a pair of Oxygen atoms,
which are pretty much
given
off as a waste product.
Good thing for us.
Animals, like
Lions and Tigers and Bears and I,
eat food made of long chains
of
Carbon Atoms and we breathe in 0xygen.
We use the Oxygen to
burn
the Carbon-based food we consumed,
and we get the energy we need
to run
our bodies.
This process, called
Respiration, provides the energy
we need,
and the Carbon atoms are now
bonded to the Oxygen atoms, in
the form of Carbon Dioxide .
The Carbon Dioxide is
exhaled by
animals like us, as a waste product.
This same Carbon
Dioxide is
then absorbed by some lucky, hungry, photosynthesizing plant
somewhere.
The cycle goes on and on,
forever and ever.
It always has,
and it always will, so long as there are plants and animals
here on
Earth.
Carbon is also stored
underground.
Remains of plants and animals buried for
millions of
years decay slowly
and change into fossil
fuels such as coal and oil.
The Nitrogen Cycle
Nitrogen is a gas quite important to you
and me,
and all the other living things on this Wonderful World.
Nitrogen is used to make Proteins,
which are substances used for cell
growth and repair.
Since
we're mostly protein, that makes Nitrogen pretty important.
The
problem is that the Nitrogen in the atmosphere isn't useable by
our
bodies.
This is where the Nitrogen Cycle comes in.
You
might think of the Nitrogen Cycle as the continuous movement of Nitrogen from the
atmosphere,
to the soil, to living things, and then back to the air or
soil.
A similar process also takes place in Earth's oceans as
well.
On land, bacteria in the soil, called Nitrogen-fixing Bacteria,
convert the atmospheric Nitrogen into substances called Nitrates.
Plants are able to use these Nitrates to build plant
proteins in
their bodies.
Animals like you and me, and lemurs,
must either
eat plants, or eat something that eats plants,
to get these same
substances into our bodies.
When plants or animals die,
their bodies
are broken down by another bacterial process,
called Decay or Decomposition.
Decay returns the Nitrogen to the air or the soil, to
become a part of the Nitrogen Cycle once again.
Food Chains and Food Webs
TThese Food Chains and Food Webs are a way
for us to visualize the matter and energy that
is flowing through an ecosystem.
Food Chain-
A series of events in which one organism eats another and obtains energy.
The first organism in a food
chain is always a producer.
A food chain describes the feeding
relationships
between producer and a single chain of consumers in an ecosystem.
Food Web-
Consists of many overlapping food chains in an ecosystem
It's a model of the feeding
relationships between many different producers and consumers in an ecosystem.
Both food chains and food webs show how different
organisms receive their energy.
They also show how
different types of organisms depend on one another.
If one organism is
removed, it may affect other organisms in the ecosystem.
Interactions among living things.
ILook, it can be a cold,
cruel world out there. There isn't enough matter OR
energy to go around.
Those that get what they need LIVE, and those that don't,
DIE.
As a result, there are many ways that living things
attempt to get the matter and energy they need to
survive.
Some of the more common methods are discussed below.
COMPETITION-is
the struggle between individuals or different populations for a limited resource.
Competition may occur within the same
species.
Competition within species
often
occurs during the mating season.
Competition may also occur
between members of different species.
Competition DOESN’T happen
between all populations that share the same resources. Many populations can
coexist in a habitat.
Different species can live
together without causing harm to one another.
Many different species of plants coexist
in a
forest. Trees can live side by side and still have enough water, nutrients
and
sunlight
to
meet their needs.
Cooperation- Not all relationships involve
competition.
This is an interaction in which organisms work in a way that benefits them
all.
PREDATION-one organism eats another organism.
Pretty simple. The one doing the eating is
the
"Predator". The one getting
eaten is the
"Prey".
Predator
and
Prey Adaptations
SYMBIOSIS-
This is the relationship between two different species who live together in a close
relationship.
The word means “living together”.
There are three forms of Symbiosis.
Mutualism-both species benefit
Commensalism-a
relationship between two species in which one species benefits while the other is
NOT AFFECTED.
Parasitism- a
relationship in which a small partner can harm a much bigger host.
The parasite benefits, the host is harmed.
Parasites are often
tiny
organisms that feed off, and weaken, their hosts.
In the end, it all boils down to
Stayin' Alive
Adaptation and
Change-When the world changes, you
adapt and change, or you die. Harsh, yet simple.
Natural Selection
Overproduction
Variation
Adaptation
Evolution