Sentences with phrase «damselflies in»

Researchers have seen other species resort to parthenogenesis when isolated, such as damselflies in the Azores.

Damselflies in the hotter setting displayed bigger differences in body size, higher activity levels and increased cannibalism rates.

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.

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.

Dragonflies and damselflies may mate while flying together in mid air in «tandem flights.»

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.

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.

We hypothesize that females use this to reduce male harassment, which is very intense in damselflies.

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.

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

As a result, it is rare to find more than one larva in a single tree hole, says damselfly expert Viola Clausnitzer.

Damselflies live in coastal forests that once formed a continuous belt in east Africa but are now fragmented, forcing the creatures into small, vulnerable populations.

All the other giant damselflies live in South America.

When her team took a closer look at dragonfly and damselfly antennae with an electron microscope, they spotted tiny bulbs in pits that resembled olfactory sensilla.

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.

Because dragonflies and their close cousins, damselflies, don't possess glomeruli or any higher order smell centers in their brains, most scientists believed these insects were unable to smell anything at all.

They used an experimental setup in which a damselfly was floated in a glass vial and exposed visually and chemically to a fish predator.

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).

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 temperaturIn 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 temperaturin temperature.