Observation: Photuris tremulans
Primary Observer:
Katie Hietala-Henschell
Event Date:
2026-06-19
Status:
Survey
Site Name:
Chase Cabin
Province/State:
Michigan
Event Date:
2026-06-19
Time of Day:
Night-Time
Start Time:
21:52
End Time:
23:04
Number of Observers:
2
Primary Observer:
Katie Hietala-Henschell
Additional Observers:
Mirralle Bennett
target_species_genus:
photinus
target_species_species:
aquilonius
Location and Habitat
Location Accuracy (meters):
0-25
Habitat Type:
Forested Wetland - Swamp, cedar bog, mangrove
Habitat Type Notes:
Small 0.5 hectare wetland with cattails, tall grass, ferns, milkweed, and nettle. Little to no standing water. Bordered by mixed forest with aspen, cottonwood, cedar, hemlock, ash, white pine, oak, and birch. Small cedar swamp pockets in area and survey site adjacent to the Middle Branch Pere Marquette River.
Elevation (meters):
135
Area Searched (hectares):
0.5
Artificial Light Sources
Vehicles: No
Street Lights: No
Buildings: Yes
Street Lights: No
Buildings: Yes
Artificial Light Types
Sky Glow (diffuse illumination in the sky): No
Light Trespass (light cast on surfaces beyond its intended target): Yes
Glare (bright light causing visual discomfort): Yes
Light Trespass (light cast on surfaces beyond its intended target): Yes
Glare (bright light causing visual discomfort): Yes
Artificial Light Notes:
Exterior lights at house on property.
Observation
Observation Type:
With Flash Data
Number Observed:
11-50
genus:
photuris
Species:
tremulans
Observation Notes:
13 mm. Flashing continued beyond survey end time.
Specimen Voucher Number:
Flash Behavior
First Flash Time:
22:00
Last Flash Time:
23:04
First Flash Temp (F):
65
Last Flash Temp (F):
60
Flashes in Pattern:
1
Flash Color:
Green
Flash Pattern Period:
0.5
Flash Duration:
2.5
Flash Interval:
2.75
Male Height Zone:
Flash Location:
Flying low to moderately high in wetland habitat and along forest edge.
Male Flash Behavior:
Typical single flash repeated every 2-3 seconds. Earlier in the survey a single flash was given every 4-5 seconds (potentially warming up).
