Invasive SpeciesHydrilla verticillata was FOUND

on 2009-10-01 in Jefferson
Submitted by iSpyaSign on Wed, 2009-12-02 at 08:50 pm
ID was Confirmed by a Vital Signs Expert Reviewer
This observation was Quality Checked by vitalsleuth
This observation was Peer Reviewed by DataTrooper
Field Notes

For years we've been on the lookout for Maine's 10 most unwanted aquatic nuisance species, and alas, it appears we have a sighting of the most aggressive of them all - hydrilla. Thanks to the efforts of volunteer lake monitors, this particular area of infestation was detected early, and is believed to be contained within a small lagoon area. This area has been cordoned off by DEP personnel to prevent spread, while a decision is being made on a longer term course of action. Sampling of a nearby similar lagoon provides initial confirmation that this sighting may be the only area of infestation, but more sampling of the entire lake will be needed, now and again in the next year(s). See second observation for comparison habitat characteristics and photos for the lagoon that appears hydrilla-free, located less than 300 yards away from this site.

Supporting evidence
Photo of my evidence.

The lake's lagoon looked like it had a carpet of weeds just below the surface of the water.

Photo of my evidence.

The plants that blanket the bottom of the lake have 5 leaves per segment. They grow around a fleshy stem.

Species Observation:
Species Looked For
Common name:
Hydrilla
Scientific name:
Hydrilla verticillata
Was found?
I think I found it
Count of individuals?
50+
Coverage?
3/4 - Completely covered
Dead or alive?
Size:
Greater than 10 cm
Sex:
Can't tell
Evidence of reproduction:
  • Vegetative structures (plants)
Sampling method:
  • Just looking around
Place studied
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Latitude:
44.163060 ° N
Longitude:
-69.489170 ° W
Observation Site Information
A photo of our study site.
Name:
iSpyaSign's visit to Damariscotta Lake
Habitat:
Freshwater - In a pond or lake
Trip Information
Trip name:
Damariscotta Lake
Trip date:
2009-10-01
Nearest town:
Jefferson
Type of investigation:
Species and Habitat Survey
Ecosystem:
Freshwater
MIDAS number:
5400
Watershed:
Other
Nearest waterbody:
Damariscotta Lake
Photo of our sampling method.
Habitat Observations
Diversity:
6 different species
Water temperature:
16.1 ° C
pH:
9.0
Dissolved oxygen:
6.0 mg/L
Salinity:
0.0 ppt
Vectors:
  • Boats

Comments

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good job!

good pictures they are clear and support the good details and field notes you made

cool...

nice photos and notes!!!

You had great field notes,

You had great field notes, and great details. But I wished that you had a couple more close up pictures of the species.

Covered!

They are so many of this species in the wetland you studied. I enjoyed looking at your few pictures, but I wished there were more. Some advise would be to maybe draw a sketch to help us understand your species thoroughly.

Hi iSpyaSign, You did a very

Hi iSpyaSign,
You did a very good job on you topic. The pictures really showed what the habitat looked like. Your information was put together very well to. Good Job!

The BumbleBee Team

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Community Suggestions:
Rosa multiflora
Suggested ID
SALSES thinks this is Rosa multiflora

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