B4.1  Adaptation to Environment

Theme:  Form and Function

Ecosystem structure determines organism form through environmental constraints that shape adaptations, while organism functions collectively create ecosystem properties.

• Geographical location, physical conditions, and ecosystem type directly determine the structural adaptations organisms need to survive and function in specific environments.
• Adaptations demonstrate form-function relationships where organism structure matches environmental demands.
• Abiotic variables create structural constraints that determine where species can survive, with each species having tolerance ranges that reflect their physiological and structural limitations.
• Limiting factors shape community structure by excluding organisms whose form cannot function within environmental constraints, creating predictable patterns of species distribution.
• Biome distribution follows predictable patterns based on temperature and rainfall, where similar abiotic conditions create similar ecosystem structures and functions regardless of geographic location.
• Biome characteristics can lead to convergent evolution where unrelated organisms develop similar structural adaptations to function in similar environments.
• Desert and rainforest adaptations exemplify extreme form; function relationships: desert organisms develop water conservation structures while rainforest organisms develop light competition and nutrient acquisition adaptations.

Guiding Questions:  
Guiding questions help students view the content of the syllabus through the conceptual lenses of both the themes and the levels of biological organization.

• How are the adaptations and habitats of species related?
• What causes the similarities between ecosystems within a terrestrial biome?

​​Linking Questions:  
Linking questions strengthen students’ understanding by making connections between topics.  The ideal outcome of the linking questions is networked knowledge.

• What are the properties of the components of biological systems?
• Is light essential for life?​

Key Terms to Know: 

Abiotic
Adaptation
Biome
Clarity
Climate
Community
Convergent Evolution
Coral Reef
Ecosystem
Grassland

Habitat
Hot Desert
Light Intensity
Limiting Factor
Mangrove Swamp
Marine Ecosystem
Organism
pH
Population
Range of Tolerance

Salinity
Sand Dune
Semi-Natural Habitat
Species
Temperate Forest
Temperature
Terrestrial
Taiga
Transect
Tropical Forest
Tundra

B4.1.1— Habitat as the place in which a community, species, population or organism lives.

• Define habitat.
• List characteristics that can be used to describe a habitat.​

B4.1.2— Adaptations of organisms to the abiotic environment of their habitat.

• Define adaptation. 
• Explain how natural selection can lead to adaptations of organisms to the abiotic environment of their habitat.
• Outline the physiological, morphological and/or behavioral adaptations of Marram grass to live in sand dune environments.
• Outline the physiological, morphological and/or behavioral adaptations of a mangrove tree that lives in a coastal intertidal zone.​

B4.1.3— Abiotic variables affecting species distribution.

• List abiotic variables that affect plant species distribution.
• Outline an example of an abiotic variable that affects an animal species distribution.​

B4.1.4— Range of tolerance of a limiting factor.

• Define “range of tolerance.”
• Discuss the relationship between adaptations, a species distribution and its range of tolerance for an abiotic factor.
• Describe methods for ethically determining the range of tolerance of a species. ​​
• Sketch a graph to illustrate the range of tolerance of an organism to an abiotic variable.

B4.1.5— Conditions required for coral reef formation.

• List abiotic conditions required for the formation of coral reefs.
• Discuss the relationship between the distribution of coral reefs and the coral’s range of tolerance to abiotic variables. ​

B4.1.6- Abiotic factors as the determinants of terrestrial biome distribution.

• Define biome.
• State the two abiotic factors that are the principal determinants of biome distribution. 
• Interpret a graph depicting the relationship between temperature, rainfall and most likely biome.

B4.1.7— Biomes as groups of ecosystems with similar communities due to similar abiotic conditions and convergent evolution.

• Outline climate conditions that characterize the tropical forest, temperate forest, taiga, grassland, tundra and hot desert biomes.
• Describe how the process of convergent evolution will lead to development of similar adaptations in a biome even if they are widely separated.
• Describe an example of convergent evolution in two widely separated ecosystems of the same biome.
  

B4.1.8- Adaptations to life in hot deserts and tropical rainforest.

• Outline the physiological, morphological and/or behavioral adaptations of an animal living in a hot desert.
• Outline the physiological, morphological and/or behavioral adaptations of a plant living in a hot desert.
• Outline the physiological, morphological and/or behavioral adaptations of an animal living in a tropical rainforest.
• Outline the physiological, morphological and/or behavioral adaptations of a plant living in a tropical rainforest.