Dr Rodolphe Gozlan from Bournemouth's Centre for Conservation Ecology & Environmental Change, believes that too much is made of the small risks associated with these introductions.
Dr Gozlan’s study - "Introduction of non-native freshwater fish: Is it all bad?" - published in the March issue of the journal 'Fish and Fisheries', reveals that more than half of the 103 non-native freshwater species introduced worldwide were reported to have no adverse ecological impact on their environment.
His analysis of data from the Food and Agriculture Organisation (FAO) and FishBase found that the risk of ecological impact after the introduction of non-native freshwater fish was less than 10% for a large majority (84%) of the species analysed.
The research, funded by the European Commission, foresees an increase in the number of non-native freshwater fish introductions. Dr Gozlan believes that environmental changes to freshwater ecosystems will inevitably have implications on the distribution of native freshwater fish with a growing reality that we will increasingly depend upon non-native introductions, especially as aquaculture production increases.
To support his work, Dr Gozlan cites the introduction of non-native rainbow trout from North America, catfish from Africa and carp from Asia to Europe as having numerous benefits. Even non-native species that are considered as detrimental to ecosystems – such as the zebra mussel in the Great Lakes of North America or the Nile perch in Africa’s Lake Victoria – are not evaluated against other environmental pressure (i.e. habitat destruction, overfishing etc.)
Dr Gozlan advises that a more realistic, though controversial, attitude is needed in assessing future risks and calls for a critical debate to be opened on the real threats posed by non-native fish.
"This would mean protecting some introductions that present beneficial outcomes for biodiversity alongside a more systematic ban of species or families of fish presenting a higher historical ecological risk,” says Dr Gozlan. “The public perception of risk is something which cannot be ignored by any government or ruling body, but in order to gain public support in the fight for conservation of freshwater fish biodiversity, the message needs to be clear, detailed and educational."
Dr Gozlan also observes that over-assessing the risks attributed to the introduction of non-native freshwater fish has lead to a public perception that all similar introductions are harmful. This perception, he believes, overshadows the measurable benefits to be gained to the ecology and economy by the appropriate introduction of non-native species.
“It is the over-assessment of the small risks associated with introducing non-native freshwater fish that has led to the common perception that such introductions pose a threat to biodiversity,” he says.
Charles Elder | alfa
Deep decarbonization of industry is possible with innovations
25.03.2019 | Fraunhofer-Institut für System- und Innovationsforschung (ISI)
Five-point plan to integrate recreational fishers into fisheries and nature conservation policy
20.03.2019 | Leibniz-Institut für Gewässerökologie und Binnenfischerei (IGB)
Cancers that display a specific combination of sugars, called T-antigen, are more likely to spread through the body and kill a patient. However, what regulates...
DESY and MPSD scientists create high-order harmonics from solids with controlled polarization states, taking advantage of both crystal symmetry and attosecond electronic dynamics. The newly demonstrated technique might find intriguing applications in petahertz electronics and for spectroscopic studies of novel quantum materials.
The nonlinear process of high-order harmonic generation (HHG) in gases is one of the cornerstones of attosecond science (an attosecond is a billionth of a...
Nano- and microtechnology are promising candidates not only for medical applications such as drug delivery but also for the creation of little robots or flexible integrated sensors. Scientists from the Max Planck Institute for Polymer Research (MPI-P) have created magnetic microparticles, with a newly developed method, that could pave the way for building micro-motors or guiding drugs in the human body to a target, like a tumor. The preparation of such structures as well as their remote-control can be regulated using magnetic fields and therefore can find application in an array of domains.
The magnetic properties of a material control how this material responds to the presence of a magnetic field. Iron oxide is the main component of rust but also...
Due to the special arrangement of its molecules, a new coating made of corn starch is able to repair small scratches by itself through heat: The cross-linking via ring-shaped molecules makes the material mobile, so that it compensates for the scratches and these disappear again.
Superficial micro-scratches on the car body or on other high-gloss surfaces are harmless, but annoying. Especially in the luxury segment such surfaces are...
The Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) at the Large Binocular Telescope (LBT) in Arizona released its first image of the surface magnetic field of another star. In a paper in the European journal Astronomy & Astrophysics, the PEPSI team presents a Zeeman- Doppler-Image of the surface of the magnetically active star II Pegasi.
A special technique allows astronomers to resolve the surfaces of faraway stars. Those are otherwise only seen as point sources, even in the largest telescopes...
11.03.2019 | Event News
01.03.2019 | Event News
28.02.2019 | Event News
26.03.2019 | Physics and Astronomy
26.03.2019 | Earth Sciences
26.03.2019 | Earth Sciences