Native SpeciesKnotted kelp

Ascophyllum nodosum
ID Confirmed
Quality checked by chotaling
Peer reviewed by Golden Barbarians of Mexico 1
Field Notes
It was a misty and blustery afternoon and the Eagle crew was on their way to Town Landing. All of the groups had just eaten lunch, yet we were still hungry for adventure. Our groups' particular bucket was placed on the edge of the rocky low tide line. The water was chilled with winter on its mind. Our group was very excited to find different invasive and native species, yet we only had one question on our minds: "Are there non-native species in Falmouth, Maine that are affecting the biodiversity of our ecosystems?"
A sketch of our study site.
Supporting Evidence
Photo of my evidence.
On the field card that we got, it said that the knotted kelp could be an olivish-green color. Also in our quadrat was a purple-colored kelp. Since the knotted kelp could not be purple, we knew that this was not the knotted kelp (also called the knotted wrack). We guessed that since this species is native to Maine, it is used to the cold, Maine waters.
Photo of my evidence.
On our species card, it said that the knotted kelp's structure was an axial pattern. In our quadrat was a different species of kelp, but we knew it was not the knotted kelp because it had more of a dichotomous growth. We also observed that since the knotted kelp was native to Maine, that it was adapted to Maine waters.
Photo of my evidence.
On our species card, it said that the knotted kelp had fairly small egg-shaped air bubbles. In the quadrat, there was a different species but the egg-shaped air bubbles were fairly large. That is how we knew that this plant was the knotted kelp. We also thought that since this species of kelp was native to Maine, that it must be accommodated to the cold, Maine waters.
Species Observation: Species Looked For
Did you find it?: 
I think I found it
Scientific name:
Ascophyllum nodosum
Common name:
Knotted kelp
Is it alive?: 
Count of individuals: 
Between 1/4 and 1/2
Vegetative structures (plants)
How big is it?: 
Greater than 10 cm
Is it male or female?: 
Can't tell
Sampling method: 
Quadrat (user-placement)
Photo of our sampling method.
Place Studied
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Map this species
N 43.732840 °
W -70.204120 °
Observation Site Information
A photo of our study site.
Coastal - Rocky intertidal
Trip Information
Falmouth Town Landing
Trip date: 
Wed, 2012-10-10 11:30
Town or city: 
Type of investigation: 
Species and Habitat Survey
Time of low tide: 
Wed, 2012-10-10 00:31
Habitat Observations
Species diversity: 
5 different species
Evidence of vectors: 
Boat ramp
Paved road
Water temperature: 
Dissolved oxygen: 


Your group took fantastic photos! We could easily tell it was Knotted kelp. Oh heck, it was one of the best observations we have seen on the Vital Signs website. I liked how you took close ups so we could see the shape and textures of the Knotted Kelp, and the backed up photos of the Knotted Kelp so you could see the area around it!


Hello Team Bird 1!

You submitted some good photo evidence and descriptions of the specimens found in your sample space. It sounds like there were several species of seaweeds present, but you were able to determine which of them were and which of them were not your target species, Ascophyllum nodosum. Great job!