Browsing All Posts filed under »behaviour«

Getting the message across

October 8, 2018

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Since recreational boaters can unintentionally spread invasive aquatic species while transporting boats and equipment from one body of water to another, it’s important that management agencies communicate the need for boaters to clean, drain and dry their gear after use.  Researchers used a questionnaire-based approach to find out if the way the “clean, drain and […]

Facing up to fish recognition

October 8, 2018

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Although it’s been shown that fish can visually discriminate between other members of their species, the traits used for recognition aren’t well understood.  Working with masked julie  (Julidochromis transcriptus), a Tanganyikan cichlid with stripe patterns from head to tail,  Japanese scientists  investigated the relative importance of  face and body markings in individual recognition.  They kept […]

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 […]

Lakes are good for river species

October 8, 2018

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While it’s known that terrestrial landscape features, such as soil type, topography and land use, influence the abundance and distribution of stream fish, only a few studies have considered the possible effects of lakes on stream fish populations.  Biologists carried out a three-year study on native brook trout (Salvelinus fontinalis) in 36 streams in the […]

Worms, midges and the greenhouse effect

July 5, 2018

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Severely impacted aquatic environments such as urban wetlands and wastewater treatment ponds are designed to treat large amounts of carbon and nitrogen, which raises concerns about their potential greenhouse gas emissions.  Because pollution-tolerant worms (oligochaetes) and insects (midges) can reach very high densities in such systems, it’s possible that their activities influence  the flux of […]

Embryos learn about future predators

July 5, 2018

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Because anti-predator strategies are highly adaptive, many prey species have evolved the ability to assess future predation risk and respond accordingly.  It’s been discovered that this capacity extends to embryos, which can use environmental cues, such as odours from predators and injured fellow prey, to learn about predators that will pose a threat for them […]

Guppies know their way around

March 25, 2018

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Rats, mice and other rodents can quickly learn to solve complex spatial problems such as mazes consisting of sequences of left-right turns. Although the spatial abilities of rodents may be the result of their burrow-dwelling existence, it’s also possible that such abilities are widely shared by other vertebrates. Fish are known to have well-developed spatial […]