Marine Ecology

Introduction to Ecology

Shift from talking about individual animals to a broader focus on ecology and ecosystems, highlighting interdependencies in the natural world.
Marine ecology course updates include a renaming from marine biology to emphasize ecological principles. Course content retains relevant topics from marine biology courses with a strong foundation in environmental science.
Students should check the syllabus for exam dates and material coverage; the instructor will maintain a steady pace throughout the module to ensure comprehension and engagement.

A poll is conducted on marine ecology class enrollment and student experiences to gauge interest and tailor the course effectively.
There is an effort to link the marine biotechnology program with the marine ecology curriculum, promoting interdisciplinary learning and career pathways.

Ecology: The scientific study of interactions among organisms and between organisms and their physical environment, vital for understanding biodiversity and ecosystem functioning.
Habitat vs. Niche:
- Habitat: The specific physical location inhabited by an organism, including the environmental and geographical features, such as the kelp forests where sea otters thrive.
- Niche: The role or job that a species performs within its habitat, which includes how it obtains resources, interacts with other organisms, and contributes to the ecosystem.
Transient vs. Resident Species:
- Transients are species that move through habitats, often during migration or breeding, such as migratory birds.
- Residents are species that occupy a specific habitat permanently, playing crucial roles in the habitat’s dynamics and stability.

Abiotic Factors: Non-living components of ecosystems that affect organisms, including:
- Weather conditions, such as storms and seasonal changes.
- Climate variations over time, influencing species distribution and behavior.
- Chemical factors, including soil pH and water salinity, essential for organism survival in specific environments.
Biotic Factors: Interactions between living organisms, including:
- Mutualism: Both species benefit, such as the relationship between clownfish and sea anemones, where they provide protection and anemones receive nutrients.
- Predation: One species (predator) hunts and consumes another (prey), critical for maintaining population balances.
- Competition: Organisms vie for limited resources, which can lead to diverse community structures and species adaptations.

Various Ecosystems to Explore:
- Intertidal communities, coral reefs, estuaries, and polar environments, each with unique biodiversity and ecological roles.
- Habitat diversity is directly correlated with species diversity; transient species may forage in rich environments while breeding in safer locations, contributing to overall ecosystem vitality.

Spatial Niche: The physical space an organism occupies, impacting local resource access and competition.
Trophic Niche: Relates to an organism’s feeding behavior, crucial in determining food web structures and energy flow.
Multidimensional Niche: Incorporates various environmental conditions necessary for survival and reproduction, emphasizing the complexity of ecological interactions.

Adaptation: Refers to short-term, reversible changes at the phenotypic level occurring within individuals in response to environmental pressures.
Evolution: Represents long-term genetic changes occurring across generations in populations due to natural selection, genetic drift, or mutation.
Example: The elongation of giraffes’ necks over generations, better equipping them to reach food sources high in trees, showcases natural selection at work.

Population: A defined group of individuals of the same species within a specific area, crucial for assessing species health and viability, such as the dense populations of sea urchins along rocky shores.
Community: The complex interactions among multiple species sharing a habitat, exemplified by the interdependence of oysters, crabs, and various fish species.

Exponential Growth: Describes populations that grow rapidly when resources are abundant; however, such growth is unsustainable long-term due to limited resources, often leading to ecological phenomena such as red tide events caused by algal blooms.
Logistic Growth: Represents population growth that stabilizes as it nears the environment's carrying capacity, balancing resource availability and population size.

Resource limits, including food, nutrients, and space, are critical factors restricting population growth and stability.
Carrying Capacity: The maximum population size that an environment can sustainably support, where overshooting can lead to population crashes and ecological collapse, exemplified in the interactions between sea otters and kelp forests.

Micronutrients such as iron play vital roles in phytoplankton growth; their presence can influence the entire base of marine food webs and productivity.
Current research focuses on projects assessing carbon sequestration potential through ocean fertilization with nutrients like nitrogen or phosphorus, balancing ecological benefits with potential risks such as eutrophication and disruptions to established species interactions.

Intraspecific Competition: Competition occurring within the same species for limited resources, exemplified by sea urchins fighting for space on rocky substrates.
Interspecific Competition: Competition between different species, which can lead to competitive exclusion (one species outcompeting another) or resource partitioning (species dividing resources to reduce competition).

Mutualism: Interaction where both species gain advantage, vital for ecosystem functioning.
Commensalism: One species gains benefits while the other remains unaffected, such as barnacles attaching to a whale.
Parasitism: One species, the parasite, benefits at the expense of another, exemplified by pea crabs residing within oyster gills, often detrimentally impacting their host.

The next session will deepen the investigation into species interactions and overarching ecosystem dynamics, further enriching students' understanding of ecological complexity.
There is an optional virtual lab introduction planned for students, providing hands-on exploration of interspecies relationships fundamental to ecology.