Researcher Daniel Gustafsson has studied chewing lice on sandpipers around the world and investigated how host birds' migration patterns affect louse distribution and reationships.
With no wings and very small eyes, chewing lice are, by and large, helpless away from their host.
Daniel Gustafsson has studied species of chewing lice that live on the birds' wings and compared them with species that live on their body feathers.
"Given that chewing lice are almost totally dependent on direct contact between two birds to spread, lice that sit on birds' wings should find it easier to use occasional contact between two hosts to spread than those that sit closer to birds' bodies," Daniel Gustafsson says.Unexpected results
"This is surprising as body lice should be more limited to one particular species of bird," Daniel Gustafsson says. "The real opportunities for spreading should be between parents and their offspring in the nest, or between adult birds during mating."
Genetic and morphological data from two different genera show complicated patterns.
"Wing lice from small bird host species are found on more host species than those that parasitize larger bird host species," Daniel Gustafsson says.Genetically almost identical
"Sandpipers are incredibly mobile," Daniel Gustafsson says. "They breed around the Polar Circle but fly to the tropics during the Arctic winter, following specific migration routes known as flyways."
He has studied sandpipers in Sweden, Japan, Australia, and Canada.
When sandpipers migrate, they do so in enormous flocks, often tens of thousands strong and containing several different species. These winter flocks should offer excellent opportunities for the lice to spread as the birds often stand in tight groups at high tide and at night.
"But it would appear that several factors other than geography play a role, including the size of the host bird," Daniel Gustafsson explains. "Specific rest and wintering environments probably play a role, too, as some of the host birds that generally winter in fresh water localities carry species of wing lice that differ from those that live on bird species that are mainly found on the seashore."Common on mammals
Other chewing lice have been seen to switch between host ducks by walking on the water surface.
Chewing lice are common in birds and most groups of mammals. There are two species that live on humans: pubic lice and head lice.
The thesis has been successfully defended.Bibliographic data:
Closing in on advanced prostate cancer
13.12.2017 | Institute for Research in Biomedicine (IRB Barcelona)
Visualizing single molecules in whole cells with a new spin
13.12.2017 | Wyss Institute for Biologically Inspired Engineering at Harvard
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
13.12.2017 | Health and Medicine
13.12.2017 | Physics and Astronomy
13.12.2017 | Life Sciences