Category Archives: Biological Sciences

Giraffes: The Massive Extinction that Nobody Knows

A Beloved Animal Lost Forever

Source: David Orgel, Giraffe, 2006. https://www.flickr.com/photos/orgel/2208083592/. All Creative Commons.

When most people think of the African Savanna, they imagine a beautiful grassland filled with lions, elephants, zebras, cheetahs, and, of course, giraffes. But what if I told you that giraffes are going extinct?

In the past three decades, the giraffe population has fallen by an enormous 40%. Currently, there are less than 100, 000 left in the world, and what few do remain, exist in vulnerable and fragmented herds, facing constant threats from habitat loss and poaching.

Giraffes overall are only categorised as a vulnerable species – meaning they are in threat of extinction for the not-immediate, but foreseeable future. However, scientists agree that giraffes are indeed endangered and face imminent extinction if nothing is done.

These numbers only get more daunting when looking at the individual subspecies. Two of the nine subspecies – Kordofan and Nubian giraffes –  are considered critically endangered with population decreases of 90% and 98%, respectively. Similarly, the Reticulated Giraffe is considered endangered – a step up from critically endangered but still facing immediate extinction. Startlingly, the West African Giraffe was saved from the brink of extinction with only 49 members still living in the 1990’s. Today the West African Giraffe has been moved to the vulnerable category despite only having 600 members total in its population.

The most heartbreaking part of this story is that the reason for this drastic decline is entirely man-made. Experts say that what is driving this beautiful species to extinction is the combined effects of habitat loss and poaching.

Source: Frapelo, Giraffe, 2009. https://www.flickr.com/photos/frapelo/3823053523/. All Creative Commons.

The encroachment of humans onto giraffe zones has begun to drive out the animals from their natural habitat, and this new contact between giraffes and humans has been harmful to both species. Giraffes have been known to die in car accidents or starve from loss of food sources.

On top of this, many poachers have been killing these protected animals for their hides, meat, and bones, making luxury crafts or medicines from the various parts. Some giraffes are even being killed for their tails alone, which are seen as a status symbol.

Thankfully, there is some hope. Conservationists have been working tirelessly to save each of these subspecies, and so far, they have been successful in this tiresome fight. However, education needs to be there.

Source: Lisa, Giraffe, 2005. https://www.flickr.com/photos/ljb/32340548/. All Creative Commons.

Most people are aware of the extinction faced by elephants, rhinoceroses, and other megafauna, largely due to the media attention those cases receive. Giraffes, on the other hand, have not received that same kind of media highlighting, resulting in what some are deeming a “silent extinction”. Experts say this is because of the common misconception that because an animal is often seen in zoos and sanctuaries, it must be under no threat in the wild. In fact, there are fewer giraffes than there are elephants.

Through awareness and understanding, groups like the Natural Resource Defense Council (NRDC) have managed to put in place policies protecting giraffes. Through more efforts, we may be able to see this species safe and stable.

 

Written by Kaitlyn Le

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The Science Behind The Polyphasic Sleep Schedule

Most people are monophasic sleepers, meaning we get our sleep all in one large chunk of the day. While there are some cultures that set time during the day for sleep , such as a siesta in Mediterranean cultures, most people (try to) get 6-8 hours of sleep at night, to stay alert during the day. To adapt to the busy schedule of school or work, polyphasic sleep schedules have become more and more popular with whole communities dedicated to the odd sleeping pattern.

Polyphasic sleep refers to any sleep schedule where you get more than 2 phases of sleep in a day.

Different types of sleep schedules

Source: http://polyphasicandexercise.blogspot.com/2012/06/polyphasic-sleep.html

By segmenting sleeping phases, polyphasic sleepers are able to sleep for much less in total, sometimes only 3 hours a day. This leaves more time to be productive during the day. There is a transition period from monophasic to polyphasic that takes a lot of dedication to change, and most say their alertness drops significantly during this time. Those who have successfully transitioned say that in general, they are just as alert as they were with a monophasic schedule, and they no longer need to sleep for more than 6 hours a day. Despite the anecdotal benefits, most people fail to transition, or return back to a monophasic sleep schedule shortly after a successful transition.

Most people will find it hard to transition and stay in a polyphasic sleep schedule, simply because their work and social culture doesn’t allow it. With everyone else being monophasic sleepers, it gets difficult to stay connected to others. It also gets difficult to find a place at work to nap during the day.

Aside from the mental difficulties people face with a polyphasic sleep schedule, sleep professionals find it difficult to recommend polyphasic sleep to people. As Dr. Avidan, director of the Sleep Disorder Center at UCLA, says, “There is very little data—none whatsoever in the medical literature—of carefully designed clinical studies demonstrating that polyphasic sleep has any advantage in human sleep medicine.”

Sleep is not like a bank account, it takes a full night of sleep to recover from just 1 hour of lost sleep. By shifting sleep schedules, you also end up shifting a lot of physiological functions that can cause adverse consequences for your endocrine and metabolic systems.

-Grant Li

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A robotic hug For Jellies

A robotic hug For Jellies

How does one capture a very delicate animal such as the jelly? The research conducted at Harvard University in Cambridge lead by Nina Sinatra has the answer.

They engineered a robot that mimics a human hand to capture delicate Jellies whose body is 95% water, slippery, and very soft. This robot, which they presented on August 28th, 2019, can capture a Jelly using its soft foamy fingers in a hug like motion. Before researchers were forced to use their own hands, which the jelly could slip from or use nets that could harm the incredibly delicate, and fragile tissue, or worse, robots made to capture other brittle sea animals such as sea cucumber would tear jellies apart.

The problem with capturing jellies without hurting them was an obstacle to fascinating scientific research. So far, Jellies have helped us learn vital information such as techniques to study microscopic organisms and macro-molecules with Green Fluorescence Tag microscopy. In this method, green fluorescence protein is extracted from jellies and used to dye parts of the cell and study vital information such as gene expression.

Jellies Have the potential to teach us far more, as they have many abilities that could be of assistance to us. For example, Jellies can reverse their aging process, and that is one of the things that humanity has been trying to reach since its beginning, leading to legends or stories such as “fountain of youth.”

Now this robot’s impressive structure can help open the door to opportunities that jellies hold for us. The machine incorporates a 3D printed palm that has the shape of a rectangular box with six fingers made of soft rubbery silicone attached. The fingers have a more rigid side made of nanofibers and channels of water that go through the fingers. When the jelly is in contact, the robot pumps water into the fingers, which causes them to bend on the more on, the stiffer side and close in the jelly.

This foamy robot is a step to further discoveries for a brighter future. The abilities of this robot can give scientists the opportunity to study more fragile and hard to capture marine animals. In addition,  using robots similar to this to collect specimen can reduce potential harm to animals and make research more friendly.

Zahra Ghodsi

Does eliminating plastic straws actually make a difference?

It has become a common trend for businesses to ban plastic straws in order to “save the oceans’. The real question is, how much do straws affect our planet?

In a recent study, it has been estimated that between 4.8- 12.7 million tons of plastic waste has entered the ocean. With the knowledge of there being great amounts of plastic in the oceans, we can now consider the effects they have on the ocean.

According to the Ocean Conservancy organization, there was over 9.3 million kilograms of trash picked up through the International Coastal Cleanup (ICC). Out of the ten most picked up items in the ocean, plastic straws was ranked 6th, with over 600,000 straws being picked up. This is an excessive amount of plastic that isn’t necessary for most people. This effect would  likely have detrimental impacts on the ecosystem.

The video called ‘Why plastic straws suck’, discusses some of the main problems with plastic straws that has the potential to have negative impacts. One problem with plastic straws is their size. They are often missed in modern recycling equipment and therefore end up in the trash.

 

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Plastic in the ocean system as discussed in another study, has potential risk to marine animals, from being poisoned due to digestion of the debris and entanglement in the plastic. It’s a known fact that marine animals are essential to our ecosystem, so humans should try to protect them from plastic pollutants.

The ban of plastic straws has the potential to greatly reduce the top 6th plastic pollutant, therefore making a positive impact on the marine ecosystem. Eliminating straws has been shown to make a difference to our planet,  but in order to ensure that we protect our planet, humans should focus on reducing all their wastes. There are many alternative options such as straw less lids, paper and metals straws are now a highly popular alternative to plastic straws. Humans should consider small steps they can take that will positively support the marine ecosystem and overall the planet itself.

 

Written by Jocelyn Benji

Missing Your Bed Time May be the Reason Behind the Extra Pounds

Image from MedicalNewsToday of a sleep deprived man

Almost everyone is guilty of saying that I’ll sleep early tonight, only for it to be midnight and having the regret of not coming to bed earlier. This bad habit may be the reason you gain weight according to many studies.

Sleep deprivation takes many tolls on the human body, including messing with hormone levels. In scientific terms, lack of sleep causes a decrease in leptin and an increase in ghrelin. Leptin works to supress your appetite and ghrelin stimulates your appetite. A study found that sleep deprived individuals had 16% less leptin and 15% more ghrelin compared to a well rested person. This is a recipe for disaster because a decrease in leptin means more eating and an increase in ghrelin means even more eating!

Image of excess body fat from MedicalNewsToday

Not only does sleep deprivation mess with hormones, the tiredness also plays a role in weight gain. As a result of being tired, individuals are more inclined to skip the gym, ditch the kitchen and buy fast food, and finally, and are more prone to indulge in sugary and fatty foods. When the brain is low on sleep, impulsive decisions are made, and the cravings are given in to. A study showed that people who had less sleep were eating 10 more grams of sugar compared to someone who had a full night of sleep! Fat and carbohydrate consumption also increased in the sleep deprived group. The longer you are out of bed, the more time you have to eat unnecessarily.

Stock photo of a sleeping man from shutter stock

Getting your sleep is very important as the frequency of diabetes, which is very closely linked to obesity, is directly related to a lack of sleep. Since individuals  with less shut-eye consumed more sugar, they were more prone to diabetes, and as a result of that, they put themselves on the path to obesity! Changes in metabolism, increased appetite and a decreased energy expenditure all directly relate to weight gain, and that can lead to more long term health problems.

Staying awake longer leads to a decline in physical activity due to being tired. More importantly, an increase in food consumption to provide more energy to stay awake longer. Sleep deprivation may be what you need to focus on in order to lose unwanted weight and get back into shape.

By Pawandeep Uppal