Admittedly, this remark is referring to most big, well-fed terrestrial
tardigrades. But we shouldn't forget that some marine tardigrades are actually
grazing continuously on sand grain surface areas, thus collecting tiny algae within a time schedule
coming close to a 24/7 shift working style.
On the other hand, a big terrestrial tardigrade is well able to shred one
of those large, moon-shaped green Closterium algae within seconds. The target is ending
up as a bunch of green debris and there is definitely no need for a second dish course.
When watching through the microscope on a regular basis we will also come across
tardigrades which spend more time on devouring a single victim. This may take
several minutes, in some cases even many minutes. And it is quite interesting to note that
the feeding on larger prey can cause problem for the tardigrade.
When trying to incorporate a long algal thread the tardigrade is encountering difficulties
as it is not able to cut the thread. Instead it tries to suck
it in like long spaghetti. This takes time and is posing a potential risk
in case an other predator is attacking the tardigrade during the process.
Macrobiotus richtersi appears to have solved this kind of longitudinal
problem. When attacking a lengthy nematode it is able to grasp it sideways,
as shown in the image below:
|