BIO121: Biospheres

Purpose of Meeting: Discuss group assignments and class logistics.
Group Assignments:
  - A running index of students who have submitted project titles.
  - Several students (6-7) are not on any team.
  - Students without teams are encouraged to raise their hands.
  - Remaining students will receive an email after class assigning them to teams.
  - Presentations are scheduled for Thursday.
  - Teams must communicate with each other to prepare.
  - In cases where team members cannot present due to travel, alternative presentation arrangements will be made (e.g., via Teams link or solo presentations in the instructor's office).

Presentation Scheduling:
- A schedule will be posted on Canvas to specify the sequence of presentations.
Class Absence on Review Day: No class will be held on the review day; materials will be posted on Canvas.
Office Hours: Available on Wednesday for any student needing support before the semester ends. Must email to schedule, except from 2-3 PM.
Extra Credit:
- An additional percentage point will be awarded if over 50% of the class fills out the course evaluations.
- Evaluations are important for program viability and resources.
Grading Clarifications:
- Traditional rounding rules will apply (e.g., minimum of 89.5 for an A).
- Presentation grades will be available by the following Tuesday, with feedback given.

Homework: Available online covering invertebrates, vertebrates, and mammals. Recommended for exam preparation.
Final Exam:
- Scheduled for April 23rd, all multiple-choice format.
- If students cannot attend, they may reschedule for finals week via administrative arrangements.
Late Submission of Final Projects: Projects can be submitted until the 29th with penalties for late submission:
- 10% off if submitted on the 28th.
- 20% off if submitted on the 29th.
Extra Credit Question on Final Exam: Feedback on the class will be solicited for improvement purposes.

Definition:
- Ecology is the scientific study of interactions between living organisms (biotic factors) and their environment (abiotic factors).
Types of Ecology:
  - Organismal Ecology: Focuses on individual organisms and their adaptations.
  - Population Ecology: Studies populations of organisms and how they change over time with environmental pressures.
  - Community Ecology: Investigates how various populations interact within specific ecosystems.
  - Ecosystem Ecology: Examines the interactions between living organisms and their environment at a larger ecological scale.
  - Landscape Ecology: Analyzes how human activities affect the environment.
  - Global Ecology: Studies ecological processes on a global scale.
  - Conservation Ecology: Addresses methods for maintaining biodiversity and reducing human impact on ecosystems.

Hierarchy of Ecology:
  - Biotic Components: Living organisms, categorized as producers, consumers, and decomposers.
    - Producers: Organisms like plants that convert sunlight into chemical energy through photosynthesis.
    - Consumers: Organisms that eat producers or other consumers. Includes herbivores (primary consumers) and carnivores (secondary consumers).
    - Decomposers: Organisms such as fungi and bacteria that break down waste materials, returning nutrients back to the environment.
Abiotic Components: Non-living factors that affect ecosystems, such as sunlight, temperature, water, and soil composition.
Ecosystem Definition: A self-regulating system composed of biotic communities (species) interacting with abiotic components, exchanging energy and matter.
- Open Ecosystem: Exchange of energy and matter occurs with the outside environment.
- Closed Ecosystem: Resource-limited and does not allow exchange of matter.

Energy Flow: Unidirectional, starting from the sun and flowing through producers to consumers and decomposers.
- Lindemann's 10% Law: Only approximately 10% of energy is passed on to the next trophic level in the food chain.
- Example Calculation: If plants convert 1000 units of solar energy, consumers only receive about 100 units.
Nutrient Cycling: Unlike energy flow, nutrients move in cycles between biotic and abiotic components. This is known as biogeochemical cycling.
- Example: Decomposed leaves return nutrients to the soil, promoting plant growth.

Ecological Succession Definition: The process through which communities in an ecosystem change over time following disturbances.
  - Primary Succession: Initiated in lifeless areas where soil has not yet formed (e.g., new volcanic islands, glacial retreats). Progresses through stages from pioneer species to a climax community.
    - Stages of Primary Succession: Introduction of lichens, followed by annual plants, then perennial plants, and finally hardwood trees.
  - Secondary Succession: Follows disturbances that do not eliminate all life (e.g., forest fires, floods). Faster than primary due to remaining soil and nutrients.
    - Replacement communities may consist of species different from those present before the disturbance.

Population Size and Density: Study of how these characteristics change over time and their relationship with the environment.
Example of Environmental Perturbation: The impact of human activity on the population dynamics of species, like flamingos in Florida due to habitat destruction.