Author Archives: joanne kit

Change starts with communication: A look into species modelling

As we see rising global temperatures, shrinking glaciers, increased species extinction, and so much more, research in environmental conservation in the 21st century has become more important than ever. Dr. Nathalie Isabelle Chardon and her colleague’s research in Greenland, published on March 23, 2022, emphasizes the need for more attention to data collection for species prediction.

Predicting Species Distribution & Abundance

A vital part of environmental conservation is tracking and predicting where species will be as they are subject to changes in the environment. These predictions are generated by examining where species are located, in what amounts, the environmental conditions they are found in, as well as the interactions they have with other species in the area. Such models are called species distribution (SDM) and abundance (SAM) models.

Frame quadrant data collection in Greenland Source: Nathalie Isabelle Chardon

Based on these models, researchers can then predict whether or not a species would be expected to be found in another area with similar conditions. The ability to make predictions on species distribution and abundance is crucial in understanding how these species will be affected by things like human interference and climate change. Scientists can then use this information to determine what species are in need of conversation efforts and to what degree of urgency.

New Research in SDM/SAM Modeling

Models such as the SDM and SAM have existed and have been used by researchers to study conservation biogeography 2013. However, a big part of science is that it is constantly evolving, changing, and adapting to new information uncovered by scientists, and such change is seen in SDM and SAM models as well. A recent study conducted by Dr.Chardon found that while common models using only one location to collect data provide good model performance, that does not necessarily guarantee realistic results. The study found that although models that use multiple locations for data collection had an overall weaker model performance, the generated results were more realistic and applicable. Additionally, Dr.Chardon’s research also indicated that including interactions between species as a variable of these models can greatly improve the model’s performance. 

Importance of Science Communication in Environmental Research

The health of our planet and biodiversity is vital to our survival as human beings that rely solely on the environment for resources. Not only does this make research in environmental conservation important, but public awareness of this issue is also just as important. Effective public awareness comes down to effective science communication between scientists and the public. To this day, we continue to see a denial of the idea that climate change is real. Such conflict in climate change opinions often stems from mistrust and miscommunication between scientists and the audience, as well as personal beliefs regarding the topic. Thus, emphasizing the importance for scientists to share knowledge on how conclusions to scientific statements are made, as well as for the public to be open to new findings. 

Dr.Chardon and Colleague during their research in Greenland Source: Dr.Nathalie Isabelle Chardon

Written by: Group 2 – Irene Choi, Joanne Kit, Jonathan Hao, & Sicong He

Turn off the lights! Diabetes and heart disease could be on the line

You have probably heard it time after time — “put down your electronics before going to bed.” Falling asleep to late-night television seems like a harmless act, but what really is light doing to your body when it comes to sleep, and how much light is too much? A recent study shows that it’s more than just a good night’s worth of sleep at risk; diabetes, obesity, and other cardiovascular functions are on the line.

Light’s effect on “fight-or-flight” 

Previous studies found that light exposure during the day activates the sympathetic nervous system. This division of our nervous system is responsible for activating the body’s instinctive “fight-or-flight” responses to threatening situations and can act to increase heart rate and blood sugar levels for a boost of quick energy. Coupled with the sympathetic system, the parasympathetic system is associated with energy conservation and digestive processes crucial for the maintenance and restoration of the body. A recent study by the Northwestern University Feinberg School of Medicine found that even when the body was asleep, light exposure triggered “fight-or-flight” responses. Consequently, the two nervous system divisions became unbalanced and restoration processes were disrupted.

Source: Science Insider

 

Next morning insulin resistance

In this Northwestern University study, 20 healthy individuals spent 2 nights in a sleep lab while being monitored for a number of measures of sleep quality: brainwave activity, breathing, heart rate, and melatonin levels. For one night, half of the participants were exposed to light equivalent to streetlights coming through a window, while the other participants remained in a fully dark setting. In addition to “fight-or-flight” responses such as increased heart rates, researchers found a significant increase in insulin resistance the morning after in participants who slept in the dimly lit room. Insulin is a crucial hormone in our bloodstreams that signals cells to pick up sugars in the blood following the consumption of carbs to be used for energy. In the condition of insulin resistance, cells fail to properly respond to insulin, thus compromising the breakdown of sugar. In view of impaired heart and sugar regulation, the study further suggested that moderate exposure to light during sleep could increase risk factors for heart disease, stroke, and type 2 diabetes.

Source: Doctablet

 

City nights, bright lights

Surveys found that up to 40% of individuals sleep with lights on through things like phones, televisions, and table lamps. With the rise and growth of urban areas around the world, it has become even more common for individuals to experience some sort of artificial light exposure during sleep. Individuals living in the city are more susceptible to outdoor light sources such as streetlights, neon signs, and nearby buildings. Considering the light exposure we experience on a regular basis, one may wonder how much light is too much light.

Night lights in downtown Vancouver, B.C., Canada. Image Credit: Clayton Perry

In this study, only 5-10 % of the light exposed to participants went through the closed eyelids during sleep. Nevertheless, the low light exposure was enough to impact measures like heart rate and insulin resistance; emphasizing the need to be aware of even the dimmest lights during sleep.

Written by: Joanne Kit

The Fight Against NEOs: Near-Earth Objects

“Don’t Look Up”, directed by Adam McKay and released in December 2021, follows the story of 2 astronomers who discover an approaching comet that they believe will destroy the Earth. Upon its release resurfaced an unsettling question; what are the odds of an asteroid striking Earth leading to mass extinction, and what actions can we take?

Encountering NEOs: Near-Earth Objects

Near-Earth objects are what scientists identify as asteroids or comets that have been nudged from the main asteroid belt into the inner solar system. The NEOWISE project is one of many ongoing operations tracking and predicting the orbital paths of NEOs to determine if they have the potential to impact Earth. The spacecraft used in this project detects NEOs by the infrared wavelengths they emit as a result of being warmed by the Sun and gathers data regarding the objects’ size and compositions. 

Source: NASA Jet Propulsion Laboratory

Famously known for the Cretaceous extinction which wiped out the dinosaurs, asteroid collisions with the Earth are not uncommon. Harmless small rocks routinely enter Earth’s atmosphere and are burned up due to the immense heating caused by friction. However, complications arise when objects larger than roughly 25 meters strike Earth. In 2013, an asteroid about 20 meters in diameter entered Earth’s atmosphere above the city of Chelyabinsk, Russia. The asteroid exploded before reaching the Earth’s surface, releasing energy equivalent to 30 times that of a nuclear bomb. The event injured over 1600 people and caused estimated infrastructure damage of 33

Informative Image

Trail of Chelyabinsk meteor taken at a distance 200km away moments after the explosion. Image Credit: Alex Alishevskikh

million USD. While encounters with NEOs large enough to cause regional damage only occur every few centuries to millennials, and civilization-threatening objects once every few million years, the environmental and human endangerment of such impacts is great enough for scientists to push for planetary defence operations. 

Planetary Defence Strategies

Planetary defence strategies to prevent encounters with hazardous NEOs are still being developed and tested today. NASA’s Double Asteroid Redirection Test (DART), launched on November 24, 2021, is the world’s first demonstration of the kinetic impactor technique involving the deliberate crashing of the spacecraft into an object. Upon reaching the targeted moon of asteroid Didymos A in September 2022, the transfer of momentum generated from the impact of the spacecraft should change the moon’s orbit enough to redirect its path. If successful, scientists hope to implement this technique to divert threatening NEOs away from the Earth in the case of such future discoveries.

Source: JHU Applied Physics Laboratory

The use of a gravity tractor could act similarly to divert the path of a NEO. This theoretical spacecraft would steer close enough to a NEO where a small but significant attraction with the spacecraft would slowly pull and change the NEO’s orbital path. Other methods involving blowing up NEOs with a powerful laser or simply evacuating the predicted impact areas have also been discussed, however, further research is required.

Should We Be Concerned?

Ultimately, the chances of an asteroid wiping out the human race is arguably infinitesimal. Yet planetary defence remains crucial to protecting our planet as encounters like the Chelyabinsk meteor remind us that even relatively small NEOs can cause significant damage. 

Written by: Joanne Kit