350
THE BIOLOGY OF EUPHAUSIIDS
evidence in the Clyde that this happens to individual Meqanyctiphanes
norveqica. A pre-spawning aggregation takes place in the deeper waters
and is probably brought about by luminescent behaviour. A small subpopulation is often resident in another shallower area a t this time and
present evidence suggests that their luminescent behaviour is different
from that of animals taken from the main population. Consequently,
as Sir Alister Hardy suggested many years ago, the possibility that
social behaviour of these animals plays a considerable role in maintaining populations cannot be excluded, not only in coastal areas but
also in the open ocean. The general area of occurrence is apparently
defined by the water masses but many species occur in two water masses
and so scope for social mechanisms of population maintenance is
obviously present.
THE BIOLOGY OF EUPHAUSIIDS
evidence in the Clyde that this happens to individual Meqanyctiphanes
norveqica. A pre-spawning aggregation takes place in the deeper waters
and is probably brought about by luminescent behaviour. A small subpopulation is often resident in another shallower area a t this time and
present evidence suggests that their luminescent behaviour is different
from that of animals taken from the main population. Consequently,
as Sir Alister Hardy suggested many years ago, the possibility that
social behaviour of these animals plays a considerable role in maintaining populations cannot be excluded, not only in coastal areas but
also in the open ocean. The general area of occurrence is apparently
defined by the water masses but many species occur in two water masses
and so scope for social mechanisms of population maintenance is
obviously present.