Symbiosis

Symbiosis - Biotic relationships

Today's agenda:

Review:

Density Dependent (biotic) limiting factors

Learn: (symbiosis) Are bacteria bad?

Multiple Select

Warm-Up: What are two types of density dependent limiting factors? (pick 2)

Calentamiento: ¿Cuáles son los dos tipos de factores limitantes dependientes de la densidad? (elige 2)

• Weather

  
  

  Clima

• Competition

  
  

  Competencia

• Predation

  
  

  Depredacion

• Disasters

  
  

  Desastres

Multiple Select

Which two of these is a decomposer?

¿Cuál de estos dos es un descomponedor?

Apple (organism) + Decomposer (organism) = Decomposition (rotten waste)

Types of decomposers

• Mushrooms and molds - Fungi

• Bacteria

Poll

Bacteria are decomposers. Are bacteria bad?

Las bacterias son descomponedoras. ¿Son malas las bacterias?

• Yes / si

• No

• Sometimes

  
  

  A veces

Poll

What was the number 1 reason soldiers died the the American Civil war?

¿Cuál fue la razón número 1 por la que los soldados murieron en la guerra civil estadounidense?

• Battles and shootings

  
  

  Batallas y tiroteos

• Bacteria

  
  

  Bacterias

Gangrene

Doctors with dirty hands infected soliers with a bacteria called gangrene. It eats away at the body but can be stopped with antibiotics. During the American Civil War antibiotics weren't invented yet.

Symbiosis

Sym - together

bio - life

sis - process of

Sym-bio-sis

Symbiosis is the process of organisms living together

Every organism has a role to play in the ecosystem

Review: Ecosystem Organization

• Least complex - Organism

• Most complex - Biosphere

Review: Food Webs

• Show where organisms get energy in their ecosystem

Multiple Choice

This an example of

• A Community

• A Population

Humans and Bacteria

• A Symbiotic Relationship

What are bacteria?

• Small single-celled organism

• Found almost everywhere on earth

• Can live in extreme conditions

• Most are harmless. Some are helpful

• Some can make us sick

• They are decomposers

• They are really good at adapting

When can bacteria be "good"?

• As they breakdown organic material, we benefit

• Food production

• Soil production

When can bacteria be "bad"?

• As bacteria breakdown material, we are harmed by it

• Infection

• Poison or toxicity

Multiple Select

Where are bacteria found on the human body?

• Skin

• Armpits

• Feet

• Mouth

• Intestines

Mutualism - Benefit both organisms

• Benefits Bacteria and benefits Humans

• Help us digest our food

• Make vitamins (vitamin K)

• Ferment foods (mmmm cheese)

Commensalism - Benefits one, doesn't hurt the other

• benefits bacteria and doesn't harm or help Humans

• Bacteria live on our skin and in our respiratory tract and our intestines

• Our body gives these bacteria an environment they can thrive without causing us harm

Parasitic - Hurts one, benefits the other

• Benefits the bacteria, hurts humans

  Cause Disease \ Illness in host

• Overcome the hosts defenses

• Grow at the expense of the host

• Produce toxins (poison)

Bacterial Infections

• We are infected with a bacteria

• The bacteria grow exponentially

• A limiting factor is introduced (antibiotic, fever, immune system)

• Growth is limited

• Host starts to recover, "bad" bacteria dies (best outcome)

• Host isn't able to overcome bacteria, host dies (worst outcome)

Open Ended

Antibiotics are used to limit the growth of "bad" bacteria until our immune systems can fight it. Unfortunately, the bad bacteria are becoming resistant to antibiotics because of overuse. What is a danger of bacteria becoming resistant to antibiotics?