Browsing All Posts filed under »physiology«

Rapid advancement depends on schooling

March 30, 2019

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  Research suggests that, as well as reducing the risks of predator attack, schooling behaviour can help fish to improve their swimming efficiency.  However, because most studies of swimming performance have been carried out on individual fish, the swimming abilities of schooling species may have been underestimated.  Typically, swimming performance experiments are carried out in […]

Aquatic plants neutralize insecticides

January 14, 2019

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sThere’s increasing evidence that submerged aquatic plants can dramatically reduce concentrations of polluting insecticides in freshwater systems and thus mitigate the impacts of these chemicals on aquatic animals.  They are thought to do this in at least two ways.  The best known method is by binding hydrophobic pesticides onto and into plant tissues, and a […]

Turbulent times for freshwater plants

January 14, 2019

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Water movement is one of the most important factors affecting the distribution of aquatic plants, and has a beneficial or detrimental impact  depending on the magnitude of flow.  Japanese researchers compared the effects of steady flow and turbulence on three plant species with different types of morphology: western waterweed (Elodea nuttallii) with whorled leaves, curly-leaved […]

What drives regional differences in streamflow?

October 8, 2018

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Typically, large-scale models of stream flow take into account the interaction between climate and vegetation (which determines evapotranspiration) and landscape features that dictate how non-evaporated water is diverted to soil, groundwater and overland flow.  However, there are often strong spatial variations in streamflow drivers, which can limit the usefulness of global models.  Researchers drew on […]

Research on insect emergence warms up

October 8, 2018

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Long-term data show that climate change affects ecosystem functioning and the body size distributions of animal species, but more information is needed to understand the mechanisms underlying these changes.  There’s a need for experimental studies that take account of linkages between the aquatic and terrestrial environment and that simulate changes in the intensity and frequency […]

Small fish species are more at risk

October 8, 2018

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Large-bodied animal species tend to have relatively low fecundity, long generation times and slow growth rates, which makes for low population turnover and a heightened risk of extinction.  This trend seems to be true for vertebrates such as mammals and marine fish, but not, it seems, for freshwater fish.  Australian ecologists explored the relationship between […]

Fish life histories: filling in the gaps

July 5, 2018

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Estimates of life history parameters such as age at maturity, maximum body size and rates of growth and mortality play a crucial role in understanding and managing animal populations, but in the case of many species they’re lacking or poorly measured.  Fortunately however, compilations of existing estimates now exist, and these databases open up opportunities […]