Iberian Lynx Doomed by Climate Change?

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The lynx of Southern Europe is in trouble, and those trying to save them are missing the boat, say researchers who predict climate change will finish what the drop in the lynx’s food supply started, unless there’s a new plan.

The lynx, to Americans, is a kind of bobcat. Iberian lynx numbers have been in freefall largely because humans have been over hunting their primary food, which is rabbits.

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But that might not be what pushes the Iberian lynx to extinction, said Miguel Araújo of the National Museum of Natural Sciences in Madrid, Spain. Climate change could be the death knell for the lynx in the second half of this century. If so, the current conservation efforts will not help them, but only slow their demise.

A new plan is needed to help the rare cats overcome the food scarcity, as well as anticipated climate changes to their habitat in southern Europe, the researchers say.

Araújo and his colleagues used ecological models that included anticipated climate change to investigate the combined effects on prey and conservation efforts for the survival of the Iberian lynx.

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“We show that anticipated climate change will rapidly and severely decrease lynx abundance and probably lead to its extinction in the wild within 50 years, even with strong global efforts to mitigate greenhouse gas emissions,” wrote Araújo and his colleagues in the July 21 edition of the journal Nature Climate Change.

Baddass Shrew Lifts Logs, Can't Be Stomped

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A new species of hero shrew, recently found in Africa, is now known to be one of the strongest, sturdiest mammals in the animal kingdom.

The shrew, Scutisorex thori, measures less than a foot long and weighs only 1.7 ounces, and yet it can lift heavy logs. The appropriately named new “hero,” found in the Democratic Republic of the Congo and described in the latest Royal Society Biology Letters, can also often survive attempted squishing.

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Lead author William Stanley, of the Field Museum of Natural History, explained to Discovery News that locals used to demonstrate the sturdiness of these tiny mammals to scientists. When researchers first documented the genus back in the early 1900s, locals immediately recognized the furry shrew.

“'Oh, that’s the hero shrew,' they said,” Stanley explained. “'We use it as a talisman. It renders us invincible to bullets and spears.'”

“At that point,” Stanley continued, “one of the men stood on the tiny mammal for 5 minutes. The shrew walked away unscathed.”

The new shrew, which sports thick, dark hair, appears to be just as strong.

Stanley and his team collected some of the mammals near the village of Baleko in the Congo. Detailed analysis of their body structure revealed that they are similar, yet distinctly different, from the other known hero shrew, Scutisorex somereni.

The most noteworthy feature that the shrews share in common is their unique spine.

“It’s massively reinforced, resulting in tremendous strength,” Stanley said.

Climate Change 10,000 Times Faster Than Evolution

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Evolution can be fast, but not fast enough to keep up with the rate of human-caused climate change, say two researchers who have studied the evolution rates of hundreds of species in the past.

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In fact, many vertebrate species would have to speed up their evolution rate 10,000 times to match today's pedal-to-the-metal rate of global warming, according to John Wiens, an ecology and evolutionary biology professor at the University of Arizona, and Ignacio Quintero, a postgraduate research assistant at Yale University.

"A big question is 'Can some species adapt quickly enough to survive?'" said Wiens. “So we looked at 17 groups of animals” comprising 540 species that included amphibians, birds, reptile and mammals, to see how they adapted to temperature changes in the past. “We estimated the rate of climate change for these species.”

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Specifically, they looked at when these species split into new species based on genetic data, which is a measure of their rate of evolution, and compared that to climate changes in the niches where those animals lived at those same times in geological history. What they found was that the species could handle a global temperature change of about one degree centigrade per million years. Their results appear in a paper in the latest issue of the journal Ecology Letters.

The problem, of course, is that humans are un-sequestering and burning millions of years worth of carbon-rich fossil fuels and releasing their heat-retaining gases into the atmosphere at a rate that's causing a temperature rise of perhaps 4 degrees Celsius by the year 2100. So if a species can't move to a nearby cooler habitat, it will be unlikely to evolve out of its predicament and survive.

All this seems to fly in the face of a variety of special cases of rapid evolution that have been documented in birds, reptiles and amphibians. But that's not quite so, explained evolutionary biologist Robert Holt of the University of Florida.

The rate of evolution of a particular group of animals probably has a lot to do with how big a set of genetic tools, or flexibility to develop new traits, a species has to work with. Some species have more than others, Holt said.

Dogs Remember as Well as Humans

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The memory of dogs is more human-like than previously thought, allowing our furry pals to copy our actions, even after delays.

The discovery, outlined in the latest issue of Animal Cognition, means that dogs possess what’s known as “declarative memory,” which refers to memories which can be consciously recalled, such as facts or knowledge.

Humans, of course, have this ability, as anyone playing a trivia game demonstrates. But it had never fully been scientifically proven in dogs before, although dog owners and canine aficionados have likely witnessed the skill first-hand for years.

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Claudia Fugazza and Adám Miklósi of Eötvös Loránd University in Hungary conducted the study. A LOT of dog studies happen in Hungary, where people really love their pooches and some of the world’s leading canine researchers live.

The team investigated if dogs could defer imitation, which in this case meant copying what their owners were doing. Eight adult pet dogs were trained using the “Do As I Do” method. (Fugazza is a leading expert on this training method for dogs.) The tasks included copying their owners walking around a bucket and ringing a bell. Can dogs then successfully replicate what they learned after a 10 or so minute distracting break?

Fugazza described what happened next with one owner-dog pair:

The owner, Valentina, got her dog Adila to pay attention to her. She then demonstrated an activity, like ringing a bell with her hand.

Valentina and Adila then took a break, with both doing whatever they wanted to do. Sometimes they played together with a ball, or relaxed on a lawn. Adila happily sniffed around and barked at passers by.

After the break, Valentina went to her original starting position and gave the command “Do it!” Adila knew exactly what came next. The attentive dog rang the bell. Adila even did this when a human stranger, who didn’t even know what the prior activity (bell ringing) was, gave the same command.