Would you please be able to tell me what the difference between kinesis and
taxis. Thanks - Johanna
A taxis is a directional response to a stimulus - towards or away from
the stimulus eg woodlice move directly away from bright light.
kinesis is a non-directional (ie not towards or away from the
stimulus) response to a stimulus - this means the response is usually shown
as in increase or decrease in activity level - eg woodlice move faster in
low humidity conditions (and move slower in higher humidity conditions)
I was wondering how are young cared for
what do they look like? Also what kind of body parts or regions do they have? Thanks
The young are raised in a brood pouch located on the lower side of the abdomen
in female woodlice. After hatching they spend a few days in the brood pouch
before escaping into the external habitat.
It is reported that at first they only have 6 segments in their thoracic
region and only 6 pairs of legs. After their first moult the segments number
increases to 7 and after the 2nd moult the number of legs increases to 7
pairs. (Sutton, (1980), Woodlice)
I have raised young woodlice in plastic 1.5 litre ice cream container. I added a few dried leaves, a small amount of soil
litter (about 1-2 tablespoons), some pieces of bark and twigs, a few teaspoons
of water, a couple of pieces of carrot and some potato (about 1-2 cubic cm of
food in total).
When the young were born they move into the soil where they remain hidden from
view. When they next become visible they are white in
color and about 1mm long. After 3 weeks they are about 2-3 mm long and a light tan
I think the secret is to make sure that you get
a gravid (pregnant) female - you can recognize this condition by turning them
upside down and looking for a yellowish swollen region on the under side of the
Make sure that the habitat is kept damp so they
don't get desiccated. Check them each day and remove any dead ones. If you keep
a regular check then you will also see them moulting and will sometimes find
half an empty exoskeleton (they only moult half their exoskeleton at a
Please could you send me any information you have on woodlice, especially their turn
alternation patterns and why this occurs.
Remember that woodlice generally lack any cuticle on their exoskeleton and are
therefore likely to become dehydrated relatively readily when they are in hot and/or dry
If a woodlouse is travelling across an open dry (or hot, or low humidity) region then
it would be in its best interests to minimise the amount of time it spends in those
conditions - if there were no obstacles then all it would need to do is to travel in a
straight line until it reached the other side.
If the woodlouse meets an obstacle then things are not so easy - if it had a rule that
it always turned left at an obstacle then it would end up going around in circles. By
showing a short term alternation of direction of turning then it is more likely to travel
in a relatively straight line - of course the best strategy and the best distance for
alternation to operate over will vary with the density of the obstacles in the environment
- the greater the number of obstacles then the greater the more likely it is that
alternation will result in the woodlouse travelling in a relatively straight line across
the area. You might like to think about what could happen if alternation always occured
even if it happened a long time after the last turn....
Hi, I was just wondering, how fast do slaters reproduce?
Woodlice probably only mate once a year (in spring). The female woodlice (at least for
Porcellio scaber and Armadillidium valgare) are able to store sperm for some time and so
may be able to produce a 2nd brood without having to mate a second time.
After fertilisation of the eggs has occurred they are released into the brood pouch which
appears as a yellowish growth on the lower side of the thoracic region. The eggs develop
over about a 4 week period. Towards the end of this time the young hatch. They will remain
in the brood pouch for a few days after which they will crawl out between the plates of
the brood pouch. If you drop a gravid female into water this may stimulate liberation of
Just out of interest, are you planning to observe development of the young? If so then
there is a description of such an experiment in Sutton's book "Woodlice",
published by Pergamon on page 115. My edition is dated 1980.
1) What do woodlice eat?
2) Why do they like the dark?
3) Do they have any preference to light intensity and why?
The answers to all these are mentioned or implied on my woodlouse pages so this will be
1) Mostly plant matter. They can survive just by eating paper and digesting
the cellulose in that - not ideal though
2) Dark areas are cool and tend to be more humid. Both of these factors
will result in reduced water loss and therefore increased chances of
survival in the terrestrial habitat. They have no waterproof cuticle to
reduce water loss so this behvioural adaptation will help prevent desiccation.
3) There preference does seem to change depending on the conditions in
which they have been previously. Woodlice which are water saturated from
living in high humidity conditions don't always show the same preference
for dark conditions shown by woodlice which have come from drier
conditions. So the answer is yes but it depends on the conditions they have
been living in.
I am studying the behavior of woodlice. I would like to see whether woodlice
'learn' a route through a maze and therefore complete the maze faster in subsequent runs.
I would be very grateful if you could E-mail me any information that could be useful
I only know of one other student who carried out research on this topic. She found that
most of the woodlice that she used did not show any signs of learning a route through a
From observations that I have made in the course of other maze experiments it often
appears that woodlice are remembering a route - but if new woodlice are used they also
tend to follow the same route used by the 1st woodlice. It seems likely that they are
following an odour trail or gradient. They may also/instead by responding to some other
environmetal variable (eg temperature or light intensity). This means that your experiment
should be carried out in such a way so as to eliminate external stimuli and also to remove
any odour traces from previous runs of the experiment. Also remember that previous forced
turns may cause an alternation response so if the woodlouse is kept in a flask between
runs then its direction of movement may be enough to influence which way they turn if they
are given a free choice turn instead of a forced turn when they are 1st introduced into
We have several of these Pill bugs getting into our house. What
can I do to stop this? Should the house be treated out side as well as in, and what can we
use to do so? Thank You - Greg C.
To prevent entry of woodlice you need two things:
Make sure there is no vegetation or dead plant matter near the house
Make sure that the house is kept dry. Woodlice can't survive for long in
dry conditions. You may need to make sure that water is not getting under the house
(foundations or basement) from a leaking pipe or other source.
You could try poisoning them.Patrick Dale suggests in his book (A
Houseful of Strangers) that a good bait can be made by mixing the following:
200g of bran
200g blood and bone manure
200g maldison at 50% concentration
Mix with enough water so it is just damp
Place in heaps under shelter near where the woodlice are found
Some URLs with more information about controlling woodlice are:
Sutton, S.L. (1980) Woodlice.Pergamon
Dale, P.S. (1992) A Houseful of Strangers: living with the
common creatures of the New Zealand house and garden, Harper Collins,
Auckland (New Zealand)