See rare planet Venus transit


This video is called ScienceCasts: The 2012 Transit of Venus.

By Andrew Fazekas for National Geographic News:

Transit of Venus 2012—Sun Show Will Be Last for a Century

How to see rare planetary lineup that may unlock puzzles of alien worlds.

Published June 4, 2012

Early this week sky-watchers around the world will be able to witness a transit of Venus—a celestial event that won’t be seen again for more than a century.

Visible either Tuesday or Wednesday, depending on where you live, the transit will offer astronomers a chance to refine our understanding of Venus as well as to tweak models for searching for planets around other stars.

Transits happen when a planet crosses between Earth and the sun. Only Mercury and Venus, which are closer to the sun than our planet, can undergo this unusual alignment.

With its relatively tight orbit, Mercury circles the sun fast enough that we see the innermost planet transit every 13 to 14 years. But transits of Venus are exceedingly rare, due to that world’s tilted orbit: After the 2012 Venus transit, we won’t see another until 2117.

During the upcoming transit, Venus will look like a black dot gliding across the face of the sun over the course of about six hours.

“Venus’s diameter will appear only about a 30th the diameter of the sun, so it will be … like a pea in front of a watermelon,” said Jay Pasachoff, an astronomer at Williams College in Massachusetts. (Read a Q&A with Pasachoff about Venus transits.)

Venus transit 2012: Take care while stargazing to see Venus’ transit of the sun: here.

Three hundred years of adventures and misadventures to see the Transit of Venus helped us measure the heavens: here.

English adders, new study


This is a video about adders in Norway.

From Wildlife Extra:

Adders need corridors through the woods

Wildlife routes through forests could help rare adder

June 2012. A new study is helping the Forestry Commission plan a brighter future for the increasingly rare adder in the North York Moors. The creature is one of the world’s most studied snakes, but mysteries still remain, especially why it is found in some areas, but not others. Reptile expert James Stroud, 25, pulled on his walking boots and set out to shed light on the subject.

Adders are thought to be on the decline due to habitat loss, but the Forestry Commission’s North Yorkshire woods are a stronghold. Working with forest rangers he delved into the creature’s secret world in Dalby and Langdale Forests, near Pickering, and Harwood Dale, Wykeham and Broxa Forests, near Scarborough.

Causes

As part of his Master’s Degree at the University of Hull’s Scarborough Campus, James probed why the snake preferred some areas over others. He looked at factors like the availability of food like small mammals and the age of trees. He also investigated the threat posed by predators like birds of prey and crows by deploying 250 plastercine [sic; plasticine] adders – some of which showed signs of being attacked.

Food less important than predators

What he found was that young conifer plantations were adder hotspots and surprisingly the abundance of food seemed less important than the threat from potential foes in determining whether the creature frequented a forest haunt. But he also concluded that linking together adder breeding colonies with snake friendly corridors could give the species a big boost.

James Stroud, originally from Amersham, in Buckinghamshire, said: “Young forest plantations are an important refuge, offering a place to bask and with shelter from potential predators. My data suggests that linking together such areas could be a real help to adder populations. That would allow them to spread more easily and not become isolated by denser forestry, which is not such a good snake habitat. There is something intriguing and unknown about snakes. Very encouragingly, I found that there are quite a lot in local forests, but you need to know where to look.”

Before stomping through local forests, James did two years of reptile fieldwork in the forests of Sulawesi, Indonesia. He has also worked with the London Zoological Society on breeding programs for endangered reptiles and helped in the first recorded breeding of Komodo dragons through parthenogenesis – a natural phenomenon where eggs are self-fertilised by the female.

Wildlife corridors

Brian Walker, Wildlife Officer with the Forestry Commission, added. “James’ work is really important – it reinforces the value of creating wildlife corridors throughout the forest, not just for snakes, but other animals too. Adder colonies are particularly vulnerable to becoming fragmented, which is bad news. They are cold blooded and need to sun bathe to keep up their body temperature. That means they may find it hard to travel long distances under denser forest canopies which block out the sun’s warming rays.”

Forestry Commission design plans could be tailored to create adder “corridors” in woods where possible – breeding sites are already plotted on a hi-tech mapping systems. The University of Hull also want to do more research. Projects could include could DNA testing of adder colonies to discover whether they intermix. Dr Phil Wheeler, Head of the Centre for Environmental and Marine Sciences at the University, supervised James’ research. He added:

“James’ work has increased our understanding of adders. An important output from his study was a set of reliable methods for studying the snake – there is currently no standard approach and that makes identifying trends in their populations very difficult. There are many things we still don’t know about this elusive yet utterly fascinating creature.”

Blue tits, great tits


This video is called Blue Tit Singing.

This morning, a juvenile blue tit sitting on the fence between the balcony and the neighbours’ balcony.

Every now and then, its parent would fly to the house-shaped bird feeder, get some food, and fly to the youngster to feed it; like yesterday.

Apparently, the young blue tits are not good enough at flying yet to land themselves on the wobbly feeder.

Some great tits visited the balcony this morning as well.

UPDATE: the great tits now feed fledglings on the balcony as well.

A male blackbird managed again to land on and feed at the feeder. That would have been impossible if he would have been just a bit heavier.

Good Guatemalan amphibians and birds news


This video is called Carlos Vasquez Almazan – amphibian conservation in Guatemala.

After bad conservation news from Guatemala, today better news:

New reserve declared in Guatemala to protect indigenous frogs and Endangered birds

Sierra Caral Amphibian Reserve in Guatemala

May 2012. Conservationists are celebrating the establishment of the new 6,000-acre Sierra Caral Amphibian Reserve in Guatemala, which will protect some of the country’s most endangered wildlife. The reserve is home to a dozen globally threatened frogs and salamanders, five found nowhere else in the world, three species of threatened birds, and the recently discovered Merendon Palm-pitviper (Bothriechis thalassinus), an arboreal, blue-toned viper.

Isolated mountain range

Tucked away in the eastern corner of Guatemala near the Caribbean Sea, and running along the Honduran border, the Sierra Caral is an isolated mountain range that is home to numerous rare and endangered animals and plants.

New species

Exploration of these mountains has yielded several new discoveries of beetles, salamanders, frogs, and snakes over the past two decades.

Threatened birds

The site will offer protections for many birds including threatened species such as: the Highland Guan, Great Curassow and Keel-billed Motmot. Furthermore, the site is known as a haven for an abundance of migratory birds including the Canada Warbler, Kentucky Warbler, Wood Thrush, Painted Bunting, Worm-eating Warbler, and Louisiana Waterthrush.

Major stop for migratory birds

“The new Sierra Caral Reserve safeguards key stopover habitat for perhaps millions of migrating U.S. birds, making it an invaluable addition to Central America’s roster of protected areas and a real benefit to U.S. bird conservation efforts,” said Dr. George Fenwick, President of American Bird Conservancy (ABC).

The Sierra Caral forests are especially diverse due to the convergence of floras and faunas from North and South America, as well as many species unique to the region. Only a few Merendon Palm Pit Vipers have been found, most often in a palm native to the Sierra Caral. Guatemalan biologist Carlos Vasquez Almazan, one of the few individuals to find a Merendon Palm-pitviper in the wild, drew international scientific attention to the conservation importance of the Sierra Caral in recent years. He was recently awarded the prestigious Whitley Award for Conservation that recognizes outstanding nature conservationists around the world.

See also here.