Melibe swim with simultaneous intracellular
recording.
Lobster treadmill.
Lobster racetrack.
This video shows the cardiac
response of lobsters to low salinity water.
The lobster is in a plexiglass
chamber that can be perfused with low salinity water. The heart
activity is recorded with an impedance device and displayed on the
oscilloscope insert. The top trace on the oscilloscope is a monitor
of conductivity, or salinity. A hand will quickly pass in front of
the tank when we start to lower the salinity. You will be able to see
the water, which we have colored blue for this demo, entering the
right-hand side of the tank. In response to the drop in salinity the
lobster will stop its heart, which we call bradycardia. Shortly
thereafter the lobster will become agitated and begin to move
around.
Lobster Trap
Video
Below is a sequence of 3 videos. The first shows a large
lobster entering a trap. The second shows how that lobster defends
the trap and prevents other smaller lobsters from entering. The final
clip shows the lobster leaving.
Clip One---Lobster
Enters
Clip Two--Lobster Defends
Trap
Clip Three--Lobster Exits the
Trap
Melibe swimming in an eelgrass
bed.
Melibe swimming in the
lab.
Melibe swimming along with a
simultaneous recording from a swim motoneuron.
Lobster walking on a
treadmill.
Top two traces show heart and
ventilation rates during walking, third trace is a moniter of
treadmill rotations.
Several segments have been spliced
together to produce this movie. Note the close correlation between
walking, ventilation and heart rates.
Lobster
racetrack.
Sensors are located in the
shelters. In this timelapse video the lobster walks 1/2way around the
track.
