Observation Of The Week, 3/9/16

Customer: So seeing a whale is guaranteed, right?

Me: Well, it is the open ocean and they are wild animals so we cannot control when and where they are-

Customer: Yeah, but I’m paying to see a whale. How long until we see one?

Me: 

Brain guardians remove dying neurons

By adolescence, your brain already contains most of the neurons that you’ll have for the rest of your life. But a few regions continue to grow new nerve cells—and require the services of cellular sentinels, specialized immune cells that keep the brain safe by getting rid of dead or dysfunctional cells.          

Now, Salk scientists have uncovered the surprising extent to which both dying and dead neurons are cleared away, and have identified specific cellular switches that are key to this process. The work was detailed in Nature on April 6, 2016.

“We discovered that receptors on immune cells in the brain are vital for both healthy and injured states,” says Greg Lemke, senior author of the work, a Salk professor of molecular neurobiology and the holder of the Françoise Gilot-Salk Chair. “These receptors could be potential therapeutic targets for neurodegenerative conditions or inflammation-related disorders, such as Parkinson’s disease.”

Salk scientists show that two immune cell receptors, called Mer and Axl, are responsible for consuming dead or dysfunctional brain cells. An accumulation of dead cells (green spots) is seen in the subventricular zone (SVZ) – a neurogenic region – of the brain in a mouse lacking the receptors Mer and Axl. (Blue staining marks all cells.) No green spots are seen in the SVZ from a normal mouse. Credit: Salk Institute    

Quoll Returns to the Australian Mainland After 50 Years

On March 1st, Fourteen eastern quolls were released into Australia’s mainland to rebuild their population because of a team’s effort from Australian National University. Since the 1770′s, quoll numbers have been declining due to many dangers such as habitat loss and predators that include foxes, wild dogs, and cats.

The quoll is carnivorous and feeds on smaller mammals, small birds, lizards, and insects. Until now, it has inhabited inland parts of Australia. There are six current species(pictured is the tiger quoll). The larger of which live longer than the smaller, with an average life span of two to five years.

So, whats the point of this translocation? Well, quolls are important to the functioning of the mainland ecosystem where they regulate the prey species. The released quolls will have radio tracking collars to be monitored.

Fact about the quoll: Male and female quolls only meet for mating, and male den territories often overlap female territories. However, they have communal toilets where they may have up to 100 droppings in them.

Photo by:  joshua cunningham via Flickr

Scientists need your help looking at photos of adorable penguins. Seriously

"We can't do this work on our own."

Guys, this is not a drill. Antarctic scientists need you to study photos of penguins to help them figure out how climate change is affecting these stumpy little flightless birds.

Scientists from the UK have installed a series of 75 cameras near penguin territories in Antarctica and its surrounding islands to figure out what’s happening with local populations. But with each of those cameras taking hourly photos, they simply can’t get through all the adorable images without your help.

“We can’t do this work on our own,” lead researcher Tom Hart from the University of Oxford told the BBC, “and every penguin that people click on and count on the website - that’s all information that tells us what’s happening at each nest, and what’s happening over time.”

The citizen science project is pretty simple - known as PenguinWatch 2.0, all you need to do is log on, look at photos, and identify adult penguins, chicks, and eggs in each image. Each photo requires just a few clicks to identify, and you can chat about your results in the website’s ‘Discuss’ page with other volunteers.

Continue Reading.

While many of the reconstructions leave something to be desired (so many wings that end, inexplicably, at the wrists?!!) the mission of this exhibit - and the ultimate message - is top notch. 

Source

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Meet the orchid mantis.

Orchid mantises—particularly juveniles—seem aptly named. They’re predominantly white with pink or yellow accents, similar to some orchids and other flowers, and their four hind legs are lobed, like petals. But if you search for an exact floral counterpart, as behavioral ecologist James O’Hanlon did, you probably won’t find one. “I spent forever looking for a flower that they look just like,” he says, to no avail.

As it turns out, rather than mimicking one floral species, the insect instead may embody a “generic or an average type of flower” in order to attract bees and other pollinating insects as prey.

What’s more, as far as O’Hanlon can tell, it’s the only animal on record that “takes on the guise of a whole flower blossom” as a predatory strategy. 

Learn more here.

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First U.S. Climate Refugees Forced to Leave Their Vanishing Island Home

Isle de Jean Charles in Louisiana is vanishing into the sea and its residents must relocate. 

The U.S. Department of Housing and Urban Development (HUD) awarded $48 million to the Biloxi-Chitimacha-Choctaw tribe who lives on this sinking island 80 miles southwest of New Orleans so that they may reestablish community further north. 

Their home — or what was once a 22,000-acre island — has been reduced to a 320-acre strip where only 25 houses remain. 

This makes members of the Louisiana tribe the first official climate refugees in the United States as rising sea levels have swallowed 98% of their land. 

Find out more in this Huffington Post piece. 

(Map via Google Maps. Sinking house photo by Karen Apricot via Flickr.) 

Taphonomy