• Genetic diversity in seagrass can help plants recover from disturbances, similar to how having different species helps ecosystems.

• This 2-year field experiment tested how seagrass with different genetics responds to various levels of disruption.

• The scientists found that having diverse genetics helped seagrass recover from the most severe disturbance, though single-type plots did better when left undisturbed.

• When an unexpected algae bloom damaged their plots, the genetically diverse plots lost fewer plants and maintained this advantage for a year, ending with more plants and biomass. This benefit came from both different plant types using resources differently and one particularly successful plant type thriving in all conditions.

• The study concludes that genetic diversity affects recovery from disturbances through multiple mechanisms that depend on specific plant traits and what you're measuring.

• Scientists studied seagrass wasting disease (caused by the parasite Labyrinthula zosterae) across a wide geographic range in both the Atlantic and Pacific oceans to understand what causes it to spread.

• In the Pacific Ocean, seagrass size and nitrogen content were the most important factors affecting disease prevalence, while in the Atlantic Ocean, seagrass size and density mattered most.

• Temperature was also an important factor influencing disease levels, especially in the Pacific Ocean.

• The study found that the relationships between disease and various factors sometimes differed from what smaller lab experiments had shown, suggesting that local conditions can change how disease spreads.

• This research helps us understand that both the characteristics of the host plant and environmental conditions affect how diseases interact with seagrass, which is important for conservation efforts.

Materials:
popsicle sticks or pipecleaners
coloring pencils or crayons
seagrass bed coloring sheet (linked online here)

For the youngest students, use a coloring sheet and a miniature quadrat (pipecleaners or popsicle sticks glued together). Students can color their sheet, learn the species listed, and then use their miniquadrat to 'sample' areas of the sheet. Who will find a flounder in their quadrat? Who will find 2 species of crabs?

Materials:

clipboards & pencils
ruler or transect
printed seagrass quadrats: (linked online here)
OR:
student worksheets: (linked online here)

Students will learn how scientists monitor seagrass habitats and track percentage cover overtime, and will practice using a quadrat to measure percentage cover of seagrass.

After learning about endangered eelgrass in their own community, a group of Swampscott high schoolers started a campaign to establish eelgrass as the official marine flora of the Commonwealth.
Learn more and sign their petition: linked online here

Division of Marine Fisheries is working with boating and fishing communities to encourage moorings that are less damaging to seagrass beds offshore.

DMF Literature: linked online here