The book deals with Diel Vertical Migration (DVM) of zooplankton
in oceans and lakes and is the first critical discussion of the
literature in 100 years of research. The accent is on
photo-response experiments that revealed the physiological
fundament unifying migration behaviour in both biotopes.
Accelerations in relative changes in light intensity of dawn and
dusk are the stimuli that trigger a PhotoBehaviour Mechanisms (PBM)
evolved to realise predator evasion and starvation prevention.
Physiology and behaviour are tuned to these adaptive goals. A "set
of ecological factors" is necessary and an algorithm shows the
operation of the "set." However, not only the kinetic component of
behaviour is based on light, also orientation but now the angular
light distribution is responsible. Contrast orientation as in
Daphnia may also hold for other animals, for example, Euphausia.The
application of the PBM in lakes and oceans is demonstrated amongst
other for the vertical movements of Sound Scattering Layers. These
layers move faster, slower or as fast as an isolume which was a
problem for the decennia long explanation that migrating animals
followed an optimal light intensity. The enigma was solved. Using
time series of changes in population size, egg ratios, development
times and death rates due to predation by juvenile fish, the
influence of DVM on population dynamics was analysed. Finally,
covering the flow of matter in the traditional food web by a
network of information transitions illustrates the controlling
function of infochemicals, such as fish kairomones.
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