Read issue #1 of Daily Digest, by Mailbrew Team.
24
Friday May, 2024
Why does North America continues to have such a large amount of deer despite high levels of urbanization and legalized hunting? And why do the reasons not apply to other regions with native deer species?

The Pampas Deer (Ozotoceros bezoarticus) used to be one of the most common mid-sized mammals in South America, with tens of millions of them across grasslands and savannas of the continent. However, centuries of excessive hunting and habitat fragmentation have drastically reduced their numbers to around one hundred thousand, reducing their distribution to the Pantanal, the Cerrado and some isolated spots. In fact, many Brazilians nowadays don't even know our country has deers, even though we have 8 species of them. The larger Marsh Deer (Blastocerus dichotomus) has also been impacted by the loss of its habitat, large wetlands. However, despite fragmentating as much of its open ecosystems and deer hunting being legalized to this day, the deer populations of the United States still have millions of individuals, to the point they may cause problems due to overpopulation. How did they manage to preserve their deer numbers so efficiently? And why did the reasons not apply to Brazil, Bolivia, Argentina and other countries with vulnerable deer species? Edit: sorry for the "continues" typo in the title, English is not my first language.

How do our bones know to grow to be the same length?

I was discussing this with a friend yesterday, and we were trying to work out how our bones know to grow to be the same length? We were thinking that it could be something about timing the growth, but might there would need to be some sort of feedback mechanism to control whether they are the same length? But then I could see this working in the legs but not the arms. This is all supposing that our bones do grow to be the same length though I suppose..

What are the possible effects of cosmic rays on the chemistry of seawater in the absence of the magnetosphere over a 20 million year period?

I recently saw something that explored the possible correlation between a loss of the magnetospehere and the Avalon explosion. This raised the question and I haven't found an easy answer for it. While I understand water is an effective barrier to cosmic rays, I wondered what kind of long term effect this exposure could have on the chemistry of seawater.

Biologists, how come different animal species can digest different types of food (meat, plants)?

Is this due to different stach acids, different gut biome/bacteria? Why?

How much does a hurricane cool off the ocean?

I am sure it is small but all the energy pulled from the warm water must make it cooler. Does where the hurricane travel get cooled water for a short time?

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