Insights into birds’ migration routes

Date:July 21, 2014Source:WileySummary:By tracking hybrids between songbird species, investigators have found that migration routes are under genetic control and could be preventing interbreeding. The research was conducted using geolocators that, like GPS, record the position of a bird and allow its long distance movement to be tracked.By tracking hybrids between songbird species, investigators have found that migration routes are under genetic control and could be preventing interbreeding. The research, which is published in Ecology Letters, was conducted using geolocators that, like GPS, record the position of a bird and allow its long distance movement to be tracked.Compared with their parents, hybrids exhibited increased variability in their migratory routes: some used intermediate routes across less suitable areas, while others used the same routes as one parental group on fall migration and the other on spring migration.”This is the first time we’ve been able to track songbirds over the entire annual cycle, and the data we collected support a longstanding hypothesis in ecological speciation, that differences in migratory behavior could be acting as postmating reproductive isolating barriers,” said lead author Kira Delmore.Story Source:The above story is based on materials provided by Wiley. Note: Materials may be edited for content and length.Journal Reference:Kira E. Delmore, Darren E. Irwin. Hybrid songbirds employ intermediate routes in a migratory divide. Ecology Letters, 2014; DOI: 10.1111/ele.12326 Cite This Page:MLA APA Chicago Wiley. “Insights into birds’ migration routes.” ScienceDaily. ScienceDaily, 21 July 2014. …

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Software uses cyborg swarm to map unknown environs

Oct. 16, 2013 — Researchers from North Carolina State University have developed software that allows them to map unknown environments — such as collapsed buildings — based on the movement of a swarm of insect cyborgs, or “biobots.””We focused on how to map areas where you have little or no precise information on where each biobot is, such as a collapsed building where you can’t use GPS technology,” says Dr. Edgar Lobaton, an assistant professor of electrical and computer engineering at NC State and senior author of a paper on the research.”One characteristic of biobots is that their movement can be somewhat random,” Lobaton says. “We’re exploiting that random movement to work in our favor.”Here’s how the process would work in the field. A swarm of biobots, such as remotely controlled cockroaches, would be equipped with electronic sensors and released into a collapsed building or other hard-to-reach area. The biobots would initially be allowed to move about randomly. Because the biobots couldn’t be tracked by GPS, their precise locations would be unknown. However, the sensors would signal researchers via radio waves whenever biobots got close to each other.Once the swarm has had a chance to spread out, the researchers would send a signal commanding the biobots to keep moving until they find a wall or other unbroken surface — and then continue moving along the wall. This is called “wall following.”The researchers repeat this cycle of random movement and “wall following” several times, continually collecting data from the sensors whenever the biobots are near each other. The new software then uses an algorithm to translate the biobot sensor data into a rough map of the unknown environment.”This would give first responders a good idea of the layout in a previously unmapped area,” Lobaton says.The software would also allow public safety officials to determine the location of radioactive or chemical threats, if the biobots have been equipped with the relevant sensors.The researchers have tested the software using computer simulations and are currently testing the program with robots. …

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White Mountains hikers often underprepared

May 28, 2013 — In a new study based on surveys of hikers in New Hampshire’s White Mountain National Forest, Brown University researchers find that many people hit the trails without essential equipment, often because they don’t think it’s needed for short hikes. Young, inexperienced hikers were most likely to lack essential gear.

Hikers in New Hampshire’s White Mountain National Forest often hit the trail less prepared than they should be, according to a study that gauged readiness by how many of 10 essential items the hikers brought along.

Young and inexperienced hikers were most likely to lack multiple items recommended by the State of New Hampshire’s HikeSafe program, according to a paper in press at the journal Wilderness & Environmental Medicine. Hikers were also less likely to prepare fully if they were planning a short hike, even though those can quickly become dangerous.

HikeSafe’s list of 10 essential items, which are needed on any hike of any duration, are a map, a compass, extra clothes, rain gear, a fire starter, a flashlight, extra food and water, a knife, a first aid kit, and a whistle. Each year, scores of imperiled hikers require search and rescue missions in the state, but little quantitative research exists on how and why they end up in trouble.

“One of the goals of this paper was to figure out where are the gaps, what are people missing, and what are people good at,” said Ryan Mason, a rising fourth-year student in the Warren Alpert Medical School of Brown University. Mason is lead author of the study that appeared online May 17 in advance of publication.

Mason did the research as part of his scholarly concentration during medical school, with advising from co-authors and emergency medicine doctors Selim Suner and Kenneth Williams of the Alpert Medical School and Rhode Island Hospital.

To compile the data, Mason surveyed 199 hikers in the summer of 2011 at the heads of three trails of varying difficulty in the national forest. Mason, who before medical school worked for several summers to maintain hiking trails in parks around the country, asked the hikers 22 questions about what gear they were packing, whether they had told others of their hiking plans and checked the weather, and why they packed or omitted what they did.

Overall, Mason found, three out of five hikers brought seven or fewer items, his cut-off point for preparedness. Only 18 percent of hikers packed all 10 items.

Mason said he found it encouraging that two out of five hikers were prepared in that they brought more than seven of the 10 items, but some kinds of hikers were clearly less prepared than others.

The young and the compassless

Among the 57 hikers in the 20 to 29 age group, only 17 were prepared, while among the 51 hikers aged 50-59, 29 were prepared. Among hikers who reported having “a lot of experience,” 54 percent proved to be prepared, while among hikers with some, little or no experience, only 29 percent were prepared.

Mason, Suner and Williams made several other findings:

vast majorities of hikers did check weather and inform a third party of their travel plans in advance;
among the 150 people who planned to hike for less than 12 hours, only 39.3 percent were prepared, but among the 41 who planned to hike for more than 12 hours, 48.8 percent were prepared;
the most common reasons for leaving out equipment was that the hike was considered a short trip or that the hiker forgot. Only nine of 167 hikers offering reasons said they didn’t own the needed equipment;
the most commonly omitted items from the list were whistle (57 percent omitted one), compass (54 percent), and a fire starter (48 percent).

While many hikers did not bring a compass, 122 out of 199 brought GPS technology. But most of those hikers (95 out of 122) brought GPS-enabled cell phones, which have little or no reception within the park (even dedicated GPS receivers can sometimes fail there).

In other regions of the country, different equipment might be needed for a safe hike, Mason noted. While this study only examines New Hampshire, Mason said that rescue organizations often perceive most hikers as underprepared.

In Rhode Island, Suner said, he has seen emergency department cases involving wilderness bikers who weren’t fully prepared, and suggested that the overall principle of properly equipping oneself applies to all outdoor adventures, including boating.

With a better understanding now of where the gaps in hiker preparedness are, Mason said, further education could help the numbers improve and keep unfortunate injuries and costly search and rescue missions to a minimum.

The Alpert Medical School funded the research.

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