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    • the Thoracic Cage
    • the vertebral column
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    • Lesson 1 - Introduction to Human Sexuality
    • Lesson 2 - Genetic Inheritance of Human Sexuality
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    • Lesson 4 - The Female Reproductive Tract
    • Lesson 5 - The Menstrual Cycle
    • Midterm Exam Study Guide
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    • Lesson 7 - Disorders of Sexual Development
    • Lesson 8 - Gender Identity and Sexual Attraction
    • Lesson 9 - Fetishism
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    • Streak Plate
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    • Eosin Methylene Blue (EMB)
    • Blood Agar
    • Dilution Series and Calculations
    • Phage Plaque Assay
    • MICROBIOLOGY UNKNOWN LAB
    • Microbiology Lab -study guide exam one
    • Ex 2 - Microorganisms
    • EX 3 - aseptic technique
    • Ex 4 - Smear Prep
    • Ex 5 - Simple Stains
    • Ex 6 - Negative Staining
    • Ex 8 - Gram Stain
    • Ex 9 - Acid-Fast Stain
    • Ex 10 - Endospore Stain
    • Ex 11 - Motility Test
    • ex 12 -​ Pure culture technique
    • ex 13 - UV Radiation
    • Ex 14 - Enumeration of Bacteria : Standard Plate Count
    • ex - 15 Effects of Temperature on Growth
    • ex 16 - Hand-washing
    • ex 17 - pH and microbial growth
    • ex 18 - Evaluation of Antiseptics
    • ex 19 - Antibiotic Sensitivity : Kirby-Bauer Method
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  • The Brain
  • The Brain
  • The Structure of DNA
  • Contact
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    • The Carbon Cycle - ACTIVITY
    • Evolution - ACTIVITY
    • The Cell Game
    • SYMBIOSIS ACTIVITY
    • THE LORAX ACTIVITY
    • Brittney the Kidney
    • From Soup to Poop
    • MITOSIS - THE NURSERY RHYME
    • Verne the Sperm and friends
      • Verne the Sperm pg1
        • Verne the Sperm pg2
        • Verne the Sperm pg3
        • Verne the Sperm pg4
        • Verne the Sperm pg5
  • Lab 6 - The Chemistry of Cells
  • A History of Anatomy
  • List of Pages
    • Microscopes
  • Cell Membranes and Osmosis
  • Chemistry of Life
  • Muscle Movements
  • The Muscles of the Head, Trunk and Shoulders
  • The Muscles of the Limbs
  • Nervous Tissue
  • The Brain - Anat and Physiology
  • Instructions for Taking BIO 3070
  • MTH 121 Algebra A - Course Schedule and Info
  • Laboratory Calendar CMC Spring 2019
  • Genetics Lab
  • Chemistry and Conversions Lab
  • Digestion and Enzymes Lab
  • Endocrine and Homeostasis Lab
  • Muscles and Reflexes Lab
  • Sensory Lab
  • Immunohistochemistry
  • Blood Lab
  • Heart Rate, Blood Pressure, Electrocardiogram Lab
  • Respiratory Lab
  • Lab 11 Renal Lab
  • Blood Typing Game
  • Body Systems Interactive
  • Ch 9 - The Central Nervous System
  • Ch 10 - Sensory Systems
  • Neuron Virtual Laboratory
  • Virtual Eye Lab
  • Virtual pH Lab
  • Chemical Bonds Virtual Lab
  • Beer's Law Virtual Lab
  • Build-an-Atom Virtual Lab
  • Diffusion Virtual Lab
  • Ohm's Law Virtual Lab
  • New Page
  • Ch 8 - Nervous System

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A History of the Human Population
​ - POPULATION ECOLOGY 

Picture

​worldpopulationhistory.org/map/1/mercator/1/0/25/


​A SHORT TRIP   
​
​​F
ROM 500,000 in 1650 TO 7.4 BILLION in 2015
​PEOPLE ON EARTH

POPULATION ECOLOGY

   The world population was estimated to have reached 7.5 billion in April, 2017. The United Nations estimates it will further increase to 11.2 billion in the year 2100.

Picture
​www.worldometers.info/world-population/
A Look at the Events That Led to the Human Population Explosion

The Beginning of Modern Humans
​- Homo Sapiens

   The spread of humans and their rapidly increasing population has had a profound impact on the environment and millions of species worldwide.
Picture
Homo sapiens evolved in Africa around 200.000 years ago.  These modern humans evolved from the Homo erectus which walked upright, had good manual dexterity and used fire.
   The more modern traits we associate with modern humans evolved around 50.000 years ago. At this point in history, Homo sapiens ventured out of Africa and populated most of the world . 
    ​Advantages that explain the evolutionary success of modern humans include
  1. Larger Brains
    1. ​More developed neocortex, prefrontal cortex and temporal lobes.
    2. These brain areas are responsible for high-level thinking and  advanced problem-solving skills. 
  2. ​Use of Tools
    1. ​Modern humans used tools to a much greater degree than other animals. 
  3. ​Build and Use Fire
    1. ​Modern humans are the only animal known to use fire.
      1. ​Fire was used for warmth
      2. Fire was used to cook food
  4. ​Creativity
    1. ​​Modern humans have created complex languages, clothing, art, belief-systems and societies.
Picture
World map of early human migrations according to mitochondrial population genetics (numbers are millennia before present, the North Pole is at the center). CC BY-SA 3.0, https://commons.wikimedia.org/w/index.php?curid=227326
Picture
Curiosity and the human desire to understand and influence the environment and to explain and manipulate phenomena (or events) has provided the foundation for developing science, philosophy, religion, anthropology and numerous other fields of knowledge."
​

​https://en.wikipedia.org/wiki/Human_evolution 
    The world population peaks at ~ 384 million people around the mid 1300's, then quickly declines due to the Bubonic Plague (a.k.a. The Black Death). The Black Death that began in China in 1334 quickly spread along trade routs to Constantinople, Europe and finally Italy in 1347. It has been estimated that as many as 50% of the European population fell ill, killing most of the infected people within the short span of 1 week. The plague killed about (1/5) one-fifth of the entire world's population. This correlates to an estimated 42 million deaths.
Picture
  The bubonic plague was carried by infected people, fleas and animals. This made the spread of the infection quick, deadly and difficult to control.
Picture
  The depopulation of Europe caused by the plague led to changes in hygiene and heath awareness, as well as social and economic changes. The world's population had decreased to 342 million people by 1400 A.D. 
​

    In 1388, the English Parliament passes an act forbidding citizens from throwing garbage into ditches, rivers, and waterways.

   Soon after, in the 1500's, Smallpox spread through the Americas killing at least one-third of the indigenous population. 
   In 1650, the world's population was 0.5 Billion people. The discovery of germs as the cause of disease occurs later that century due to the invention of the microscope. 
​    The increased knowledge of bacteria, viruses and the spread of disease changes the sanitation and hygienic practices of people in society. 

Picture
Picture
     Alexander Cummings patents the first flush toilet 1775. Thomas Crapper added widespread popularity and several refinements to this invention a hundred years later.
     The discovery of "germ theory" and the invention of the microscope lead to the first Small Pox Vaccine in 1796 by the English physician Edward Jenner. 

The World Population Hits 1 Billion in 1800 

    The world population reaches 1 billion. Global life expectancy is only approximately 30 years, due to high child mortality rates.
​ 
​   Social reformer Edwin Chadwick starts the Public Health movement in 1843. Improvements in sanitation and awareness continued to combat diseases and increase the health and longevity of the human race. 
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The rise of agriculture, and domestication of animals, led to stable human settlements. By Transferred from the German Wikipedia. Original file is/was here. (Original upload log available below.), GFDL, https://commons.wikimedia.org/w/index.php?curid=35770
   Farming and domestication of animals has been around since about 10,000 B.C. However, farming technologies such as irrigation, crop rotation and fertilizers only developed in the 1800's, beginning with the British Agricultural Revolution and spreading to developed nations since 1900. These new developments played a significant role in the growth of the human population. 
   Modern agriculture has had a negative impact on the environment.has raised social, political, and environmental issues including sequestering land and water, pesticide use and water pollution.
  Physician John Snow links the spread of cholera to contaminated water in 1854. Snow’s findings lead to changes in the water and sewage systems around the world. 
   In 1902, William Thompson Sedgwich published The Principles of Sanitary Science and Public Health.This book connected water pollution to the Lowell typhoid epidemic in 1890 and helped to raise awareness on the importance of sanitation.
​     Interestingly, Jersey City (United States) becomes the first population center to chlorinate the water supply in 1908, drastically reducing typhoid rates.
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In 1927, the world population reaches 2 billion people. The global life expectancy is 39 years.
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Population Ecology

   A hallmark of the last 150 years has been the ability of farmers to increase food production. The amount of grain harvested worldwide increased from 631 million tons in 1950 to 1.65 billion tons in 1984. However, the increase in food production was not met with equitable distribution due to poverty. 

     Public health advancements played a huge role in increasing the world population. Access to clean drinking water increased from 50% of the population before 1990 to 75%. The discovery of germs and creation of vaccines. The germ theory of disease of the 1870's led to water purification and nutritional education. 

    As of this year, 2017, the world's population is now an astounding 7.5 Billion people. 

Population ecology is a sub-field of ecology that deals with

     1) the dynamics of species populations

     2) how these populations interact with the environment

     3) how the population sizes of species change over time and geographic location
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   The human population is growing at an exponential rate and is affecting the populations of other species in return. 
​

 Examples
  1. chemical pollution
  2. deforestation
  3. irrigation 
  4. desertification
  5. waste
  6. resource depletion


This principle in population ecology provides the basis for formulating predictive theories 
 
Population density 
 
Dispersion pattern - The way individuals are spaced within an area
  1. Clumped Dispersion – grouped in patches, often due to unequal distribution of resources. This is the most common dispersion pattern.
  2. Uniform Dispersion - evenly spread out over a given area, often the result individual interactions of a population.
  3. Random Dispersion – spread out in an unpredictable way, often due to either social interactions or changes in habitat conditions. 
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Survivorship curves
How do we make a survivorship curve?      Plot the log of the percentage of survivors by the percent maximum lifespan to get the “survivorship curves”.
 
There are 3 types of survivorship curves
  1.       Type I
  2.       Type II
  3.       Type III
 
1. Type I survivorship curve
  • For a Species that exhibits a type I survivorship curve – Most of the individuals of that species will survive until they reach “old age”
  • Species that exhibit Type I survivorship curves, tend to have few offspring and give a lot of parental care.
  • Examples
  1.       Humans
  2.       Large mammals
 
2.  Type II survivorship curve
  • For a Species that exhibits a type Ii survivorship curve – the survivorship of that species remains relatively constant over the lifespan.
  • Examples:
  1.       Hydra
  2.       Invertebrates
  3.       Lizards
  4.       Rodents
 
3.      Type III survivorship curve
  • For a Species that exhibits a type IIi survivorship curve – Most of the individuals of that species will die young, but the ones that live on to adulthood will live a relatively long time.
  • Species that exhibit Type III survivorship curves, tend to have huge numbers of offspring and give very little , if any, parental care.
  • Examples:
  1.       Fish
  2.       Oysters
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Type I Survivorship Curve
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Type II Survivorship Curve
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Type III Survivorship Curve
Two patterns of population growth:
  1.       Exponential (J-shaped) - occurs when there are plenty of resources
  2.       Logistic (s-shaped) - begins to occur when population gets too high and it is approaching the carrying capacity of the ecosystem.
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Exponential Growth Model
  • In the exponential model of population growth, you do not see the effect of limiting factors. 
  • Population undergo rapid and explosive growth of population.
 
  • This equation expresses rate of change
  • the intrinsic rate of increase “r” is assumed to be constant
 
•When a population is introduced to a new environment, it will often display Exponential Growth.
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•After some time, this will change to a logistic growth model. WHY? This is because as the population increases, there is competition for resources. The population approaches the carrying capacity of the ecosystem.

 
Logistic Growth Model
 
• The carrying capacity is the limit of the individuals of a certain species that a particular ecosystem can support. 
          Limiting factors that contribute to the logistical growth model are …
  1.       Limited Food
  2.      Limited Space
  3.       Limited water
  4.      Illness
  5.       Intraspecific competition – when members of the same species compete for limited resources. This leads to a reduction in fitness for both individuals.
  6.       Interspecific competition - when members of different species compete for a shared resource.
 
 “Boom-and-bust” population cycles
- These are dramatic fluxuations in population
Boom-and-Bust cycles occur when the population growth of one species is closely tied to a limiting factor that may be expended.

  •          The predator populations increase and decrease as the prey numbers change.
  •          Predation may be an important cause of density-dependent mortality for some prey.
  •          Boom-and-bust cycles: Prey populations rapidly increase.
 
The Boom-and-Bust cycle has two-phases:

  1.       Boom – rapid population increase is followed by a…
  2.       BUST – population falls back to minimal levels
 
Example of Boom-and-Bust cycle - Lynx and snowshoe hare population cycles
  1.       Lynx and snowshoe hare population cycles have a period of rapid population increase followed by a sudden precipitous decline in numbers. 
 
  1.       The increase is prey is then followed by an increase in the predator population.
  2.       As predators eat the prey, the prey population goes down.
  3.       As the predator’s food source becomes scarce, the predator population decreases.
  4.      As the predator population decreases, The prey population can increase again
  5.       —the cycle repeats; for example, the snowshoe hare and lynx have a 10-year cycle.
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​What is Symbiosis?
Symbiosis is the result of coevolution, the interdependent evolution of two interacting species.
 
In symbiosis, individuals of one species usually live in or on or around the individuals of another species. At least one of the species—and sometimes both—uses its partner’s resources.

Types of Symbiosis

 
 There are 3 types of symbiotic relationship
  1. Mutualism - Both species benefit
  2. Commensalism - One species benefits, but the other is not helped or harmed
  3. Parasitism - ​One species benefits, but the other is harmed
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MUTUALISTIC SYMBIOTIC RELATIONSHIPS –
Sea Anemone and the Clown Fish

Sea Anemones are predators that attach themselves to rocks or coral. They are immobile and eats fish by stinging them with its tentacles as the unsuspecting fish swims by. These tentacles will shoot out a long poisonous thread. The toxins in this thread paralyze the prey.
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Clownfish are one of the only species that can survive the deadly sting of the Sea Anemone. By making the anemone their home, clownfish become immune to its sting.
These fish will gently touch every part of their bodies to the anemone’s tentacles until it no longer affects them.  A layer of mucus then forms on the clownfish’s body to prevent it from getting stung again.
   A sea anemone makes an ideal home for a clownfish. Its poisonous tentacles provide protection from predators and a clownfish makes its meals from the anemone’s leftovers
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Parasitic Relationships

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The tongue louse


The tongue louse is a parasite that replaces the tongue of its victims. Tongue lice are all born as males. Each louse searches for a host. When they find a fish, they enter the fish. If there is no other louse infesting the fish, the louse will turn into a female and wait for a male to join it inside the fish host. If he finds there is already a female infesting the fish, he will remain male and mate with her. As this transformation takes place, the female’s body grows enormously and anchors itself firmly inside the mouth of the unlucky fish.

ZOMBIE ANTS

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A parasitic fungus is known to manipulate the brains of ants turning them into slavelike "zombies". The fungus releases its mind-controlling chemical cocktail on its host. 
   Fungi of the genus Ophiocordyceps — so-called zombie ant fungi — need ants to complete their life cycle. When an ant comes across fungal spores while foraging, the fungus infects the insect and quickly spreads throughout its body.
   A carpenter ant infected with a zombie ant fungus in the genus Ophiocordyceps. Once the fungus kills its hapless drone it grows a spore-releasing stalk from the ant's head in order to infect more ants.
   Fungal cells in the ant's head release chemicals that hijack the insect's central nervous system. The fungus forces the ant to climb up vegetation and clamp down onto a leaf or twig before killing its hapless drone. It then grows a spore-releasing stalk out of the back of the victim's head to infect more ants on the ground below.

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LIFE CYCLE OF A BOTFLY

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Botflies, or Dermatobia hominis for humans and the genus Gasterophilus for other mammals, are a bumble bee-like fly that require a human or mammal host in order to complete their life cycle. The life cycle of the botfly is comprised of four stages.
Egg Transmission
Adult female botflies lay their eggs on blood-sucking insects, such as mosquitoes or ticks, that they capture during flight. This practice is known as phoresy. After a period of 10 to 140 days, the host insect consumes a blood meal. This transfers the mature botfly eggs from the flying insect to the warm-blooded animal, which then hatch upon feeling the temperature increase. Adult females can also attach their eggs directly onto the hairs of mammal hosts. Egg hatching and larvae movement may cause the mammal to bite or scratch at the area.
It's a Grub Life
The mammal may consume some of the first instar larvae by licking them. Alternatively, the larvae may travel down hair follicles or through bite wounds and burrow into the mammal's skin. From here, the larvae undergo their final two instars, or molt periods, in the skin of the mammal or in the digestive tract during the winter. Larvae developing in the digestive tract attach to the system's walls and feed on tissue. In early spring, they detach as third instars and are expelled through the mammal's feces. Third instar larvae growing in the skin drop from the mammal host after a period of 30 days.
Rest and Renewal
Mature larvae expelled through feces or dropped down from skin in early spring burrow into soil and begin to pupate within two or three days. Pupae do not feed. Instead, they use this time to transform into adults. For a period of one month, the pupae develop adult features, such as wings and antennae. Once fully transformed, sexually mature adult botflies emerge and begin the life cycle over again.
Life Cycle Completion
Like pupae, adult botflies do not feed. Newly emerged from their pupal cases, the adult botflies have sensitive antennae to make up for their poor vision. Male and female adults depend on their sensitive antennae to find each other and mate. During summer and fall, adult females seek hosts for their eggs, whether they catch a fly or mosquito and transfer their eggs to them, or directly attach their eggs to warm-blooded mammals such as cattle, rabbits, sheep and horses.



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