Big idea 2 d growth and dynamic homeostasis are influenced by changes in the environment
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Homeostasis in a Changing Environment. Big Idea 2.D: Growth and dynamic homeostasis are influenced by changes in the environment. Essential Knowledge.

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Big idea 2 d growth and dynamic homeostasis are influenced by changes in the environment

Homeostasis in a Changing Environment

Big Idea 2.D: Growth and dynamic homeostasis are influenced by changes in the environment


Essential knowledge
Essential Knowledge

  • 2D1: All biological systems from cells to organisms to populations, communities, and ecosystems are affected by complex biotic and abiotic interactions involving exchange of matter and free energy.

  • 2D2: Homeostatic mechanisms reflect both common ancestry and divergence due to adaptation in different environments.

  • 2D3: Biological systems are affected by disruptions to their dynamic homeostasis.



External Environment

Made up of Biotic Things: Living


External Environment

And Abiotic Things: Not Living


TPS: With your partner, make a list of 4 other biotic and 4 other abiotic factors that may affect organisms in an environment.


Case study biofilms
Case Study: Biofilms other abiotic factors that may affect organisms in an environment.

  • Bacterial cells attach to each other to form biofilms (a protective protein matrix cover)

  • Communal group for protection and shared nutrients

  • Grow with limited nutrients.


Cells interact with biotic abiotic factors
Cells Interact with Biotic/Abiotic Factors other abiotic factors that may affect organisms in an environment.


Organisms interact with biotic abiotic factors
Organisms Interact with Biotic/ other abiotic factors that may affect organisms in an environment. Abiotic Factors

  • Organisms access to nutrients is affected by other factors

  • i.e. symbiosis, predator-prey, nutrient availability etc


Interactions among organisms
Interactions Among Organisms other abiotic factors that may affect organisms in an environment.

  • Symbiosis: relationship b/t 2 species

  • Mutualism (+,+)

  • Commensalism (+,0)

  • Parasitism (+,-)


Mutualism
Mutualism other abiotic factors that may affect organisms in an environment.

  • Both Species Benefit

  • Rhinos and oxpeckers


Commensalism
Commensalism other abiotic factors that may affect organisms in an environment.

  • One member is helped, the other neither benefits or is harmed

  • Cows and Cattle Egrets


Parasitism
Parasitism other abiotic factors that may affect organisms in an environment.

  • + and - relationship

  • parasite benefits, host loses

  • parasite usually smaller than host

Leech Bite, Thailand

Lamprey



Evolution of homeostatic mechanisms
Evolution of Homeostatic Mechanisms or abiotic factors

  • Some mechanisms are conserved- showing common ancestry

  • Others have changed, demonstrating divergent evolution (due to changing envs)


Case study nitrogenous waste removal
Case Study: Nitrogenous Waste Removal or abiotic factors

  • All animals produce N byproducts

  • Animals in diff. envs. have evolved different mechanisms for excreting these wastes


Ammonia nh 3
Ammonia, NH or abiotic factors3

  • Toxic byproduct of protein degradation

  • In dilute concentrations is no big deal, so aquatic orgs can excrete it into water


Urea or abiotic factors

  • Mammals convert NH3 into urea  travels through blood to kidneys and is excreted w/ water and other substances as urine


Solid uric acid
Solid Uric Acid or abiotic factors

  • In birds and reptiles (and some desert mammals) N waste is excreted as a solid

  • Prevents H2O loss and buildup of H2O waste in shell of an egg




Disruptions at the molecular cellular level affect organisms homeostasis
Disruptions at the Molecular/Cellular Level Affect Organisms Homeostasis

  • Exs: viral infection of a cell, allergies, or dehydration in Willis’s body ;)


Disruptions to ecosystems affect homeostasis
Disruptions to Ecosystems Affect Homeostasis Homeostasis

  • Exs: food chain disruptions, natural disasters, salination (adding salt)


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