The gastrointestinal system in fish is much more sensitive to temperature changes than previously believed and may even be a limiting factor for the distribution of species, a thesis from the University of Gothenburg shows.
By looking at how gut function in various fish species is affected by both rapid and slow changes in water temperature, we can better understand what will happen to different species when the climate changes.
“When the temperature of the water rises, the fish’s body temperature climbs, activity in the gut increases, and more energy is needed to stay healthy,” says researcher Albin Gräns,who has studied various species in both saltwater and freshwater environments in western Sweden, California and Greenland.
“Since changes in body temperature affect virtually all of a fish’s organs, it’s surprising that we know so little about how temperature changes impact on their physiology,” says Gräns.Winners and losers
His research shows that some species may find it harder to absorb nutrients as water temperatures rise, while others could profit from the new climate.
“If the water temperature in the Arctic rises further, some sedentary species, such as various types of sculpin, will probably struggle to maintain blood flow in the gut during the summer months, which will affect their health,” he explains.
Other fish, such as those currently living at the lower extremes of their possible distribution, could instead benefit from a slightly higher temperature. The effects of a rise in water temperature will therefore vary between species, and many of the changes are difficult to predict.
“Our work is largely about trying to identify the physiological bottlenecks, in other words which parts of the body will fail first – whether the heart or the gut is the most sensitive part of the system.”Exploiting temperature differences
“By eating at one temperature and then swimming off to another temperature to digest the food, fish can exploit areas that might otherwise be harmful to them,” says Gräns.
The thesis has been successfully defended.For more information, please contact: Albin Gräns
Surface clean-up technology won't solve ocean plastic problem
04.08.2020 | University of Exeter
Improving the monitoring of ship emissions
03.08.2020 | Carl von Ossietzky-Universität Oldenburg
Scientists at the Fraunhofer Institute for Laser Technology ILT have come up with a striking new addition to contact stamping technologies in the ERDF research project ScanCut. In collaboration with industry partners from North Rhine-Westphalia, the Aachen-based team of researchers developed a hybrid manufacturing process for the laser cutting of thin-walled metal strips. This new process makes it possible to fabricate even the tiniest details of contact parts in an eco-friendly, high-precision and efficient manner.
Plug connectors are tiny and, at first glance, unremarkable – yet modern vehicles would be unable to function without them. Several thousand plug connectors...
An international research team has found a new approach that may be able to reduce bone loss in osteoporosis and maintain bone health.
Osteoporosis is the most common age-related bone disease which affects hundreds of millions of individuals worldwide. It is estimated that one in three women...
Traditional single-cell sequencing methods help to reveal insights about cellular differences and functions - but they do this with static snapshots only...
“Core-shell” clusters pave the way for new efficient nanomaterials that make catalysts, magnetic and laser sensors or measuring devices for detecting electromagnetic radiation more efficient.
Whether in innovative high-tech materials, more powerful computer chips, pharmaceuticals or in the field of renewable energies, nanoparticles – smallest...
An international research team with Prof. Cornelia Denz from the Institute of Applied Physics at the University of Münster develop for the first time light fields using caustics that do not change during propagation. With the new method, the physicists cleverly exploit light structures that can be seen in rainbows or when light is transmitted through drinking glasses.
Modern applications as high resolution microsopy or micro- or nanoscale material processing require customized laser beams that do not change during...
23.07.2020 | Event News
21.07.2020 | Event News
07.07.2020 | Event News
06.08.2020 | Earth Sciences
06.08.2020 | Power and Electrical Engineering
06.08.2020 | Life Sciences