Enter a kelp forest and explore the various threads that connect species together in food webs.
How do changes in the ecosystem effect the community? Enter an underwater forest of kelp and explore the various threads that connect species together that help maintain diversity and balance in food webs.
In addition to showcasing live footage from a unique ecosystem, each of the three videos in the Exploring Ecosystems series features an opportunity for students to actively participate in a problem-solving scenario based on an ongoing research project of Academy scientist Peter Roopnarine.
As you watch the video, be prepared to pause at key points to participate fully! Explore food webs through the kelp forest featuring sea otters (Enhydra lutris), sea urchins (Echinoidea), sea stars (Asteroidea), sunflower seastars (Pycnopodia helianthoides), abalone (Haliotidae), and other marine animals.
The Coastal Food Web video investigates the following questions:
How do you predict the effects of a change in the community’s populations on the community as a whole?
How will a change in an ecosystem affect energy flow, nutrient cycling, population growth, or community structure?
How will loss of an organism from a food chain or web affect flow of energy?
Check for Understanding
Describe two concrete examples of community interactions, being sure to describe the relationships between species.
Key Scientific Terms
community: two or more different species occupying the same geographical area and interacting in some way
ecosystem: the community of different species in a particular geographic area and all of their interactions with each other and the physical environment; ecosystems are also called ecological networks
herbivore: an animal that eats plants; also called a primary consumer
population: all the individuals of a particular species that live in a specific geographic area; a species may be made up of one or more populations
predator: an organism that hunts, catches, kills, and eats other animals
prey: an organism that is caught, killed and eaten by a predator
species: a distinct type of organism
Connections to High School Standards
LO 4.13: The student is able to predict the effects of a change in the community’s populations on the community.
(1) Interpreting graphs and other quantitative data that represent community and ecosystem interactions.
(2) Reading curves that represent community interactions (e.g., predator-prey) and using them to infer relationships between species.
(1) Working with ecological models and using them to predict how a change in an ecosystem will affect energy flow, nutrient cycling, population growth, or community structure.
(2) Predicting how loss of an organism from a food chain or web will affect flow of energy.
Next Generation Science Standards
DCI: LS2.C: Ecosystem Dynamics, Functioning, and Resilience
Crosscutting Concepts: Energy and Matter; Stability and Change; Systems and System Models
Science and Engineering Practices: Using Mathematics and Computational Thinking; Using Models
Food Webs Before the Impact http://www.calacademy.org/explore-science/food-webs-before-the-impact
In this Science News article, explore what killed the dinosaurs 65 million years ago. Could it have been the health of ecosystems from 13 million to 2 million years prior to the impact?
Healthy Ecosystems Limit Disease in Humans and Wildlife https://www.calacademy.org/explore-science/healthy-ecosystems-limit-disease-in-humans-and-wildlife
Ecosystem services in the form of food, water, shelter, and even medicines are key to our lives, but furthermore, studies have determined that diseases emerge from damaged environments. In this article learn how our human health depends on a healthy environment.
More from the Exploring Ecosystems Series
In this video series, students participate in problem-solving exercises as they explore how species interact with one another and their environment. While the coastal food web video covered kelp forests, the below tutorials discuss biodiversity and mutualistic relationships, respectively.
Exploring Ecosystems: Tropical Rainforest Diversity https://youtu.be/LHPuo0rwM1w
Trek through a tropical rainforest and explore the incredible diversity of species that call it home.
Exploring Ecosystems: Coral Reef Symbiosis https://youtu.be/-EUUEPinEcQ
Dive beneath the ocean waves and explore the unique and diverse relationships found on a coral reef.
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From least greatest (10) to greatest greatest (1), the poems in this list are limited to ones originally written in the English language and which are under 50 lines, excluding poems like Homer’s Iliad and Edgar Allan Poe’s “Raven.” Each poem is followed by some brief analysis. Many good poems and poets had to be left off of this list. In the comments section below, feel free to make additions or construct your own lists. You can also submit analyses of classic poetry to [email protected] They will be considered for publication on this website.
10. “The Road Not Taken” by Robert Frost (1874-1963)
Two roads diverged in a yellow wood, And sorry I could not travel both And be one traveler, long I stood And looked down one as far as I could To where it bent in the undergrowth;
Then took the other, as just as fair, And having perhaps the better claim, Because it was grassy and wanted wear; Though as for that the passing there Had worn them really about the same,
And both that morning equally lay In leaves no step had trodden black. Oh, I kept the first for another day! Yet knowing how way leads on to way, I doubted if I should ever come back.
I shall be telling this with a sigh Somewhere ages and ages hence: Two roads diverged in a wood, and I— I took the one less traveled by, And that has made all the difference.
Meaning of the Poem.
This poem deals with that big noble question of “How to make a difference in the world?” On first reading, it tells us that the choice one makes really does matter, ending: “I took the one less traveled by, / And that has made all the difference.”