MODULE 1- Introduction to the Salth Marshes Learning Outcome: HS-LS2-2&4 Preparation: ~45 minutes Classroom Time: 3 – 50-minute lessons Day 1: Salt Marsh Plant Adaptations & Photosynthetic Strategies Objective Students will explore plant adaptations in salt marshes and correctly classify plants by marsh zone (low, middle, high, and upland), photosynthetic pathway (C3 or C4), and salt adaptations (hydrophyte or halophyte), using evidence to justify their placement. Materials Plant profile cards (include species name, image, root system, photosynthetic type, habitat) Salt marsh map of zones Chart paper or digital template for sorting plant types. Water potential worksheet Activities Time Activity 0-10 minutes Engage – Quick brainstorm: What do you know about salt marshes? Show photos. Ask: “What kind of plants can survive here?” Go over the different salt marsh zones. 10-25 minutes Explore – Pass out salt marsh plant cards. Students work in pairs to identify plants by marsh zones- low, mid and high- and discuss how these adaptations help plants survive in salt marshes. 25-35 minutes Explain – Discuss differences in root systems, photosynthesis types, and how water potential influences absorption. Link back to card characteristics. ADD LINK FOR CANVA HERE 35-45 minutes Elaborate – Use a chart to sort plants into groups (C3/C4; halophyte/hydrophyte). Discuss adaptations that allow survival in high-salt or submerged areas. Place the plant type in the correct zone. 45-50 minutes Exit Ticket – Students answer: Why are C4 grasses more efficient in salt marshes? or What is one way a halophyte survives high salinity? Teacher Prompts and Answers Engage Prompts Q: What comes to mind when you hear ‘salt marsh’? Have you ever seen one? A: Answers may include wetlands, grasses, water, crabs, fish, birds, or yes/no to personal experiences. Q: Why do you think only certain plants grow in saltwater areas? A: Because most plants can't tolerate high salt levels, salt marsh plants have special adaptations. Q: What challenges might plants face living in salty, waterlogged environments? A: Salt stress, low oxygen in the soil, and changing water levels. Explore Prompts Q: What do you notice about the root systems of these plants? A: They are often fibrous and dense, sometimes with air spaces to help them survive waterlogged soils. Q: Which traits might help this plant survive in salty water? A: Thick leaves, salt glands, specialized root systems. Explain Prompts Q: How does being a halophyte give an advantage in a salt marsh? A: Halophytes can tolerate or remove salt, allowing them to live where other plants can't. Q: Why might C4 photosynthesis be more efficient in high-salinity or high-light areas? A: C4 plants lose less water and are more photosynthetically efficient in those conditions. Q: How does water potential affect how plants take up water in a salty environment? A: High salt reduces water potential, making it harder for roots to draw in water without special adaptations. Elaborate / Exit Prompts Q: If you were designing a plant for a salt marsh, what features would you give it? A: Salt tolerance, deep or spreading roots, and the ability to store water. Q: Why might a hydrophyte not survive in a salt marsh? A: Because it lacks adaptations to deal with salt and may absorb too much saltwater. Q: What’s one question you still have about plant survival in coastal ecosystems? A: Student-dependent; may include questions about tides, salinity changes, or temperature effects. Teacher notes Adaptations of plants in salt marshes Salt tolerance: Many plants have adaptations, such as salt glands or succulent tissues, that help them tolerate high salt levels that would kill most land plants. Water management: Tidal flooding means plants must tolerate being submerged and then exposed. Grasses like Spartina have root systems that help anchor them through strong tides and waves. Stabilizing Soil: The dense roots of marsh grasses capture sediment and help prevent erosion, protecting the shoreline and creating habitat for fish, crabs, and birds. Low Marsh (Tidal Creek Zone) Location: Closest to tidal creeks and open water Flooding: Flooded twice daily by tides Conditions: High salinity and sediment movement, low oxygen in soils Root System: Dense, shallow, fibrous root with rhizomes. Dominant plants: Spartina alterniflora (smooth cordgrass) Salicornia virginica (Glasswort/Pickleweed) Bulboschoenus robustus (Saltmarsh bulrush) Ecological role: Provides habitat for fish, crabs, and invertebrates High primary productivity (primary pathway for nutrients and organisms) Middle Marsh (sometimes called “intermediate marsh”) Flooded: Regularly, but not every tide Conditions: Moderate salinity Less waterlogged than the low marsh Root System: Fine roots and diverse rhizome networks Common plants: Spartina patens (saltmeadow hay) Distichlis spicata (salt grass) Limonium carolinianum (Sea Lavender) Juncus roemerianus (black needlerush) Why it matters: Transition zone where plant diversity increases Great example of abiotic stress gradients (differences in zones abiotic factors cause changes in plants) High Marsh Location: Slightly higher elevation than the low marsh Flooding: Flooded only during high tides or storms Conditions: Less saline than low marsh but still stressful, better oxygenated soils. Dominant plants: Spartina patens (saltmeadow cordgrass) Distichlis spicata (salt grass) Iva frutenses (Marsh elder) Ecological role: Nesting habitat for birds Supports insects and small mammals Marsh–Upland (Transition Zone) Location: Border between marsh and upland Flooding: Rarely flooded Conditions: Lower salinity, more diverse soils Dominant plants: Salt-tolerant grasses mixed with upland species Ecological role: Buffer zone that reduces erosion High plant diversity Adaptations per Zone Low Marsh Challenges- Flooded daily, high salinity, low oxygen and wave action Aerenchyma tissue (air channels)- large internal air spaces in stems and roots that transport oxygen from leaves to roots and prevent root suffocation in waterlogged soils. Salt tolerance mechanisms Salt excretion through specialized glands (cordgrass) and salt storage in vacuoles (pickleweed). Leaves die and fall off to remove excess salt. Flexible stems Bend with tidal flow instead of breaking, reducing damage from waves and currents. Shallow, spreading roots Anchor plants in soft mud and hold waterlogged sediment together, reducing erosion. Horizontal rhizomes allow the plant to spread quickly and withstand high-energy waves. Middle Marsh Challenges- Flooded irregularly, moderate salinity and competition for space Moderate Salt Tolerance- Can survive salt exposure but not constant flooding. Balance between salt exclusion and storage Dense growth- Outcompetes neighbors for space, traps sediment and organic matter. Highly efficient at absorbing nutrients. Narrow or waxy leaves- reduce water loss during dry periods and protect from salt spray. Seasonal flowering- Flowers bloom when flooding is lowest, maximizing pollinator access. High Marsh Challenges: rare flooding, lower salinity, drier, sometimes compact soil, transition to upland competition. Lower salt tolerance: Still salt-adapted but outcompeted in low marsh, thrive where flooding stress is reduced. Drought tolerance: deeper root systems and reduced leaf surface area Rhizomes and runners: allow plants to spread horizontally and stabilize soil. Woody stems: provide structural support and compete with upland plants for light. Vocabulary Hydrophyte: a plant that grows only in or on water. Halophyte: a plant adapted to grow in a saline condition. Xenophyte: a plant that grows in dry soil. C3: Most common photosynthetic pathway. Uses the enzyme Rubisco. C4: an adaptation to reduce photorespiration in hot climates and conserve water. Uses the enzyme PEP carboxylase first. https://www.pioneer.com/us/agronomy/c3-c4-photosynthesis-crop-production.html Water potential in high salinity environments (REVIEW) Water moves from higher water potential (less negative) to lower water potential (more negative). Water potential is affected by solute and pressure potential. When soil has a high salt concentration, the soil water potential becomes very negative lowering the water potential compared to the plant root cells. Therefore, water moves out of the plant roots and the plant will experience physiological drought. Even water is present the plant cannot absorb it easily. How do halophytes survive? Plants will lower their internal water potential by storing ions (Na+ and Cl-) as well as organic osmolytes (help maintain cell volume) in vacuoles. This makes their internal potential even more negative than the soil. They can also excrete salt through leaves or pump salt out of roots. Day 2: Food Web Construction & Keystone Species Objective Students will build a food web of a salt marsh ecosystem and identify keystone species. Materials Animal and plant cards Food web building template or table markers Student Handout Activities Time Activity 0-10 minutes Engage – Show a short clip or image of a coastal marsh. Ask: What types of animals live here, and who eats whom? https://youtu.be/BarkpicNAGw?si=5GBbDIvtiYhZFuw6 10-30 minutes Explore – In small groups, students use cards to build a salt marsh food web, drawing connections with arrows. Include producers, primary/secondary/tertiary consumers, and decomposers. 30–40 minutes Explain – Introduce the concept of keystone species. Guide students in identifying which species have the greatest effect on the ecosystem if removed. 40-47 minutes Elaborate – Groups present and explain their food web. Compare different group keystone species. 47-50 minutes Exit Ticket – Quick Write – Students write a paragraph: What role does a keystone species play in a salt marsh, and what might happen if it's lost? Teacher prompts and answers Engage Prompts Q: Who eats who in a salt marsh? How do you know? A: Producers (like grasses) are eaten by herbivores (e.g., snails), which are eaten by carnivores (e.g., birds). Arrow show direction of energy flow. Q: What would happen if one important species disappeared? A: The food web could collapse or shift, affecting many other organisms. Explore Prompts (as students build food webs) Q: Which species seems to connect to the most others? A: Likely a keystone species or mid-level consumer; depends on food web layout. Q: Are there more producers or consumers in your web? A: Usually more producers to support the energy needs of all the consumers. Q: Do you see any decomposers or detritivores in your system? A: Yes- bacteria, fungi and crabs or worms that break down dead material. Explain Prompts Q: What is a keystone species? Can it be small? Why? A: A species with a big impact on the ecosystem’s structure. Yes, even small organisms can be keystone species. Q: What makes one species more ‘influential’ than others in your food web? A: Its role in supporting or regulating many other species. Q: What happens to the ecosystem if your keystone species is removed? A: It may collapse or become less diverse and stable. Elaborate / Exit Prompts Q: How might human activity affect one or more levels of your food web? A: Pollution, overfishing, habitat destruction can remove key species or reduce biodiversity. Q: Which organism would cause the biggest collapse if it disappeared? A: Usually the keystone species or major producer like marsh grasses. Q: Why is biodiversity important in food webs like this? A: It provides stability, resilience and more interactions to support the ecosystem. Vocabulary Producer- An organism that makes its own food using sunlight (photosynthesis). Primary Consumer- An organism that eats producers (herbivore). Secondary Consumer- An organism that eats primary consumers. Tertiary Consumer- An organism that eats secondary consumers; often a top predator. Decomposer- An organism that breaks down dead plants and animals, recycling nutrients back into the ecosystem. Food Chain- A simple line that shows who eats whom in an ecosystem. Food Web- A network of connected food chains showing many feeding relationships. Energy Flow- The movement of energy from the sun to producers and then to consumers. Ecosystem- A community of living organisms interacting with each other and their physical environment. Predator- An animal that hunts and eats other animals. Prey- An animal that is hunted and eaten by another animal. Keystone Species- A species that has a very large impact on its ecosystem. If it is removed, the ecosystem changes dramatically. Biodiversity- The variety of different living organisms in an ecosystem. Habitat- The natural home or environment of a plant or animal. York River Salt Marsh Food Web (Teacher Reference) PRODUCERS Salt Marsh Cordgrass (Spartina) Saltmeadow Hay Algae / Phytoplankton PRIMARY CONSUMERS Salt Marsh Cordgrass → Marsh Periwinkle Snail Salt Marsh Cordgrass (detritus) → Fiddler Crab Algae / Phytoplankton → Eastern Oyster Algae → Grass Shrimp Algae / Plant Material → Mummichog PRIMARY CONSUMERS Salt Marsh Cordgrass → Marsh Periwinkle Snail Salt Marsh Cordgrass (detritus) → Fiddler Crab Algae / Phytoplankton → Eastern Oyster Algae → Grass Shrimp Algae / Plant Material → Mummichog SECONDARY CONSUMERS Marsh Periwinkle → Blue Crab Fiddler Crab → Blue Crab Grass Shrimp → Striped Killifish Mummichog → White Perch Eastern Oyster (larvae) → Atlantic Croaker TERTIARY CONSUMERS / TOP PREDATORS Blue Crab → Great Blue Heron Blue Crab → Diamondback Terrapin Striped Killifish → Snowy Egret White Perch → Osprey Atlantic Croaker → Bald Eagle ADDITIONAL WEB CONNECTIONS Blue Crab → River Otter Fish (Perch, Croaker, Killifish) → Osprey Fish → Bald Eagle Fiddler Crab → Raccoon DECOMPOSERS Dead Plants & Animals → Bacteria & Fungi → Nutrients → Plants KEYSTONE SPECIES Blue Crab (Most Common Keystone Example) Why it is a keystone species in the York River salt marsh? Feeds on snails, small crabs, shrimp, and small fish Is a major food source for birds, terrapins, otters, and humans Controls populations of marsh grazers (like periwinkles) What might happen if Blue Crabs were removed? Periwinkle and fiddler crab populations increase Overgrazing of marsh grasses Loss of marsh plants Habitat decline for fish and birds Entire food web becomes unbalanced Salt Marsh Food Web – Answer Key (Teacher Reference) Part 1: Understanding the Food Web What are the producers in your food web? Salt marsh cordgrass (Spartina) Saltmeadow hay Algae / phytoplankton Why are producers important in an ecosystem? They make their own food using sunlight. They are the base of the food web. All other organisms depend on them for energy. Choose one primary consumer. What does it eat? Examples: Marsh periwinkle eats cordgrass Fiddler crab eats detritus (dead plant material) Grass shrimp eats algae Eastern oyster filters phytoplankton Choose one secondary consumer. What does it eat? Examples: Blue crab eats snails, shrimp, small crabs Striped killifish eats shrimp White perch eats small fish Which organisms are the top predators? Great blue heron Snowy egret Osprey Bald eagle River otter Diamondback terrapin Part 2: Energy Flow Original source of energy? The Sun Example energy pathway: Sun → Cordgrass → Marsh periwinkle → Blue crab → Great blue heron (Other correct pathways acceptable.) Why do food webs have arrows? What do they show? Arrows show the direction of energy flow. They show who eats whom. Energy moves from the organism being eaten to the eater. Part 3: Keystone Species Thinking Likely keystone species: Blue crab (most common answer) Why? Eats many organisms (controls populations). Is eaten by many predators. Connects multiple trophic levels. What might happen if it disappeared? Snail and crab populations increase. Overgrazing of marsh grasses. Marsh habitat declines. Birds and fish lose a food source. Ecosystem becomes unbalanced. Part 4: Decomposers Role of decomposers: Break down dead plants and animals. Return nutrients to the soil and water. Support plant growth. If there were no decomposers: Dead material would build up. Nutrients would not be recycled. Plant growth would decrease. Food web would eventually collapse. Challenge Question If fish populations decreased: Birds like osprey and herons would have less food. Crabs might increase (less predation). Smaller organisms eaten by fish might increase. The food web would shift and become unbalanced. Day 3: Biomass & Biodiversity Calculations Objective Students will use sample data to calculate biomass and Simpson’s Diversity Index to compare two coastal ecosystems. Materials Data sets for 2 ecosystems (species counts & population sizes) worksheet Calculators or spreadsheets Biomass conversion factor chart Simpson’s Index formula reference Activities Time Activity 0-10 minutes Engage – Ask: How can we tell which ecosystem is healthier or more diverse? Show images of two coastal zones (dense vs. degraded). 10-25 minutes Explore – Students use data sets to calculate biomass for two ecosystems (using dry mass data or conversion factors). Compare total biomass. 25-40 minutes Explain – Teach how to calculate Simpson’s Diversity Index:Ds = 1- Σ (n/N)2 40-47 minutes Elaborate – Analyze results: Which ecosystem is more diverse? Does biomass align with diversity? Why or why not? 47-50 minutes Exit Ticket – Students summarize: Which ecosystem is more resilient based on your data, and why? Teacher Prompts and Answers Engage Prompts Q: How can we measure the health of an ecosystem without being there? A: By looking at biodiversity data, biomass, water quality, or satellite images. Q: Do you think high biomass always means high biodiversity? Why or why not? A: No, a few large species can make up lots of biomass but not much biodiversity. Explore Prompts (while calculating) Q: What do you notice about the populations in Ecosystem A vs. Ecosystem B? A: One may have more species, or more even distribution: the other may have dominant species. Q: Which species contributes the most to biomass? The least? A: Depends on species size and number. Often producers contribute the most. Q: Are any species dominant in number? How does that affect diversity? A: Dominance lowers diversity if one species outcompetes others. Explain Prompts Q: What does the Simpson Diversity Index tell us that biomass does not? A: It measures species richness and evenness, not just mass. Q: Why might two ecosystems with the same number of species have different diversity scores? A: Because one may have more balanced populations; the other may be dominated by one species. Q: How do these measures help conservationists? A: They guide protection efforts by identifying healthy, diverse systems or those at risk. Elaborate / Exit Prompts Q: Which ecosystem would you prioritize for protection and why? A: The one with higher biodiversity, keystone species, or more ecosystem services. Q: How could a low diversity index affect food web stability? A: It makes the system more fragile, fewer options if one species is lost. Q: What do your data say about resilience in these environments? A: Mor diverse ecosystems are usually more resilient to change or disturbance. TEACHER NOTES Part I- Biomass calculations Dataset A total biomass= 3,300 g/m² Dataset B total biomass- 1,780 g/m² Biomass Analysis Questions Which ecosystem has greater total biomass? The Healthy Salt Marsh (3,300 g/m²) has greater total biomass than the Degraded Marsh (1,780 g/m²). Which species dominates the degraded marsh? Common Reed (Phragmites) with 900 g/m² biomass, more than half of the total biomass. How might dominance by one species affect food web stability? Dominance by one species can reduce biodiversity and food web complexity. It can make the ecosystem less stable and resilient to changes (e.g., disease, climate impacts). Other species may decline due to competition or lack of resources. Part II- Simpson Diversity Index Dataset C Index- .8077 Dataset D Index- .6357 Diversity Analysis Questions Which ecosystem has a lower D value? The Degraded Salt Marsh has a lower diversity index (0.636) compared to the Healthy Marsh (0.808). What does this tell you about biodiversity? The degraded marsh has lower biodiversity and is less evenly distributed among species. The healthy marsh has higher biodiversity with a more balanced distribution of individuals. How does biodiversity relate to ecosystem resilience? Higher biodiversity usually increases ecosystem resilience to changes or disturbances. Ecosystems with low biodiversity may be more vulnerable to collapse. PART III: Graphing Prompts Graph 1: Biomass Comparison Bar Graph Graph Title: Biomass Comparison of Plant Species in Healthy vs. Degraded Salt Marshes Conclusion: The Healthy Salt Marsh shows more evenly distributed biomass across several species. The Degraded Marsh shows dominance by Common Reed (Phragmites), causing uneven biomass distribution. Graph 2: Species Dominance Pie Chart (Degraded Marsh) Analysis: The pie chart shows that Phragmites dominates the degraded marsh biomass. This dominance explains the lower Simpson’s Index, indicating less species evenness.

Please make this an authentic project.

I want to design a project about the rocky shore that incorporates NGSS standards. It will blend math, science, and literacy, with students working together in groups to explore key concepts. My students love Pokemon this year. We want to visit the Birch Aquarium.

Unsure at this moment

Different types of fossils and how they are made

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AP Environmental Science Unit 9 with learning targets and success criteria 5 day lesson plan