Sentences with phrase «of damselflies»

In the absence of mortality threat, growth rates of damselflies increased with warming until about 23.5 °C and then began to decline, a typical unimodal response to changes in temperature.

To ensure their experiments were relevant to fruit flies» real - world experiences, Card teamed with fellow Janelia group leader Anthony Leonardo to record and analyze the trajectories and acceleration of damselflies — natural predators of the fruit fly — as they attacked.

The conspicuous wing coloration is used in color communication between the sexes and between different species of damselflies.

In the new paper the researchers studied the conspicuous wing coloration of two species of damselflies, which are predated by birds and prey on small flies.

A new study from a group of researchers at Uppsala University has studied the conspicuous wing coloration of two species of damselflies.

Not exact matches

Better yet, on the dust - jacket of David Attenborough's splendid Life in the Undergrowth, a creature that turns out to be a damselfly appears to be sizing up the reader as it pauses, front legs arrested in a judo - like stance, perhaps interrupted at tea.

Based on this effective model, the Dragonfly Monitoring Network was created with the aim of gaining a greater knowledge of the distribution and abundance of dragonfly and damselfly species in the Chicago region and, eventually, to expand the network across Illinois and beyond.

Other wildlife found here include a variety of amphibians, reptiles, and mammals such as painted turtles, Fowler's toads, red fox, river otters, and at least 24 species of dragonflies and damselflies.

Also, naturalists discover 60 new species of dragonfly and damselfly in Africa, the National Institutes of Health reveals its first agency - wide strategic plan in more than 20 years, and the U.S. National Science Foundation plans a massive overhaul of its McMurdo research station in Antarctica.

So a team at the University of Toronto tested whether a warmer world would also be a damselfly - eat - damselfly one.

Using damselfly nymphs (Lestes congener) hatched in the lab, researchers put nymphs of various sizes in two different temperature environments, one a balmy 18 ° Celsius and the other a toastier 24 ° Celsius.

The researchers, who release their findings in the Proceedings of the National Academy of Sciences, did not see a similar reduction in trematode infections in the presence of larval damselflies, which are intraguild predators, meaning they attacked and killed not only the parasites but also the tadpole hosts.

Observations revealed that D. villosus took a far greater toll on the other species in its tank than did G. duebeni, killing and mangling large numbers of blue - tailed damselflies, water boatmen, fish leeches and water hoglice.

This implies that males, but not females, pay a high cost when they use color to communicate with other damselflies, both in terms of predation risk and visibility to prey.

Researchers from the Universities of Turku and Helsinki, Finland, are the first in the world to discover which species adult dragonflies and damselflies prey upon, as modern laboratory techniques enabled the study of the insects» diet.

Damselflies gravitated to the spot of the screen just on the other side of the fruit fly cluster, providing the first evidence that scents guide damselfly and dragonfly behavior, the team reports this month in the Journal of Insect Physiology.

Once believed to lack a sense of smell, dragonflies and damselflies, such as Ischnura elegans (pictured), possess olfactory bulbs in their antennae that may help them track prey.

Groups of cockroaches have consistently shy and bold members, whereas damselflies have shown differences in risk tolerance that stay the same from grubhood to adulthood.

Surprisingly, however, when a fish predator was looming, the damselflies ate about the same amount of food but grew much more slowly.

Reeves says it is possible that they are evading the damselflies by building decoys of larger, less appetising spiders.

404 Southeast aquatic species: The southeastern United States contains the richest freshwater biodiversity in the nation, harboring 62 percent of the country's fish species (493 species), 91 percent of its mussels (269 species) and 48 percent of its dragonflies and damselflies (241 species).

I remember how the sun reflected from the damselflies hovering over the canals, and the beauty of nature is what inspired me to become a scientist.

We measured and evaluated how temperature and predation risk affected growth rates of predaceous damselfly nymphs (Enallagma vesperum, Odonata: Coenagrionidae).

First, we conducted growth trials at five temperatures crossed with two levels of predation risk (fish predator present versus absent) and measured growth rates, consumption rates, assimilation efficiencies, and production efficiencies of 107 individual damselflies.

Scientists added 1,360 dragonflies and damselflies, bringing the total to 1,989, of which 261 are threatened.