Hydrostatic pressure affects selective tidal stream transport in the North Sea brown shrimp (Crangon crangon).
The brown shrimp (Crangon crangon) is a highly abundant invertebrate in the North Sea, with its life cycle stages ranging from deep offshore spawning to shallow onshore nursery areas. To overcome the long distances between these two habitats, brown shrimp are suspected to use selective tidal stream transport (STST), moving with the cyclic tide currents towards their preferred water depths. However, it is not known which stimulus actually triggers STST behavior in brown shrimp. In this work, we determined the influence of different hyperbaric pressures on STST behavior of juvenile brown shrimp. Brown shrimp activity was recorded in a hyperbaric pressure chamber that supplied constant and dynamic pressure conditions simulating different depths, with and without a tidal cycle. Subsequent wavelet and Fourier analysis were performed to determine the periodicity in the activity data. The results of the experiments show that STST behavior in brown shrimp varies with pressure and therefore with depth. We further show that STST behavior can be initiated by cyclic pressure changes. However, an interaction with one or more other environmental triggers remains possible. Furthermore, a security ebb-tide activity was identified that may serve to avoid potential stranding in shallow waters and is 'remembered' by shrimp for about 1.5 days without contact with tidal triggers.
University of Hamburg, Institute for Hydrobiology and Fisheries Science, Olbersweg 24, Hamburg 22769, Germany Gesellschaft für Marine Aquakultur, Hafentörn 3, Büsum 25761, Germany tielmann@gma-buesum.de.
Moritz
M
Tielmann
University of Hamburg, Institute for Hydrobiology and Fisheries Science, Olbersweg 24, Hamburg 22769, Germany Thünen Institute of Fisheries Ecology, Palmaille 9, Hamburg 22767, Germany.
Stefan
S
Reiser
University of Hamburg, Institute for Hydrobiology and Fisheries Science, Olbersweg 24, Hamburg 22769, Germany.
Marc
M
Hufnagl
University of Hamburg, Institute for Hydrobiology and Fisheries Science, Olbersweg 24, Hamburg 22769, Germany.
Jens-Peter
JP
Herrmann
University of Hamburg, Institute for Hydrobiology and Fisheries Science, Olbersweg 24, Hamburg 22769, Germany.
André
A
Eckardt
University of Hamburg, Institute for Hydrobiology and Fisheries Science, Olbersweg 24, Hamburg 22769, Germany.
Axel
A
Temming
D025041:Animal Migration; D000818:Animals; D001522:Behavior, Animal / Q000502:physiology; D033501:Crangonidae / Q000502:physiology*; D006874:Hydrostatic Pressure; D009659:North Sea; D055871:Tidal Waves; D014872:Water Movements
North Sea; STST; Tidal trigger; Zeitgeber