Basking sharks are much more canny predators than previously thought, ecologists have discovered. According to new research published online by the British Ecological Societys Journal of Animal Ecology, basking sharks are able to reverse their normal pattern of diving at dawn and surfacing at dusk in order to foil the attempts of zooplankton trying to evade capture. As well as shedding new light on basking behaviour, the results have important implications for the conservation of shark species.
Dr David Sims of the Marine Biological Association and colleagues examined diving behaviour of four basking sharks (Cetorhinus maximus) - two in the shallow sea off Plymouth and two in the deep water off the shelf-edge southwest of Ireland and in northern Clyde Sea in Scotland - using pop-up tags that measure swimming depth, water temperature and light levels. The tags were programmed to detach themselves from the sharks at a set time, float to the surface and then drift with the currents like a “electronic messages in bottles”, before being washed up on beaches and found by the public.
Sims found that while the sharks in deep waters exhibited normal diving behaviour, tracking the zooplankton Calanus up to the surface at dusk and then downward at dawn, sharks in the western English Channel did the reverse. This is the first time this behaviour has been observed among plankton-eating sharks, the authors say, and shows that shark diving behaviour differs predictably between deep waters and in shallow seas close to plankton-rich boundaries in water temperature.
Becky Allen | alfa
Dispersal of Fish Eggs by Water Birds – Just a Myth?
19.02.2018 | Universität Basel
Removing fossil fuel subsidies will not reduce CO2 emissions as much as hoped
08.02.2018 | International Institute for Applied Systems Analysis (IIASA)
For the first time, a team of researchers at the Max-Planck Institute (MPI) for Polymer Research in Mainz, Germany, has succeeded in making an integrated circuit (IC) from just a monolayer of a semiconducting polymer via a bottom-up, self-assembly approach.
In the self-assembly process, the semiconducting polymer arranges itself into an ordered monolayer in a transistor. The transistors are binary switches used...
Breakthrough provides a new concept of the design of molecular motors, sensors and electricity generators at nanoscale
Researchers from the Institute of Organic Chemistry and Biochemistry of the CAS (IOCB Prague), Institute of Physics of the CAS (IP CAS) and Palacký University...
For photographers and scientists, lenses are lifesavers. They reflect and refract light, making possible the imaging systems that drive discovery through the microscope and preserve history through cameras.
But today's glass-based lenses are bulky and resist miniaturization. Next-generation technologies, such as ultrathin cameras or tiny microscopes, require...
Scientists from the University of Zurich have succeeded for the first time in tracking individual stem cells and their neuronal progeny over months within the intact adult brain. This study sheds light on how new neurons are produced throughout life.
The generation of new nerve cells was once thought to taper off at the end of embryonic development. However, recent research has shown that the adult brain...
Theoretical physicists propose to use negative interference to control heat flow in quantum devices. Study published in Physical Review Letters
Quantum computer parts are sensitive and need to be cooled to very low temperatures. Their tiny size makes them particularly susceptible to a temperature...
15.02.2018 | Event News
13.02.2018 | Event News
12.02.2018 | Event News
21.02.2018 | Life Sciences
21.02.2018 | Life Sciences
21.02.2018 | Materials Sciences