Questions tagged [environment]

The natural world, especially pertaining to the interactions of life therein.

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2answers
95 views

Is there a physiological reason why direct lightning strikes are not lethal for everyone or does it all come down to dumb luck?

Some people who get directly struck by lightning and some more than once (starts at 00:25) survive while others die instantly or later on due to complications/injuries. Looking at a wiki page for ...
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1answer
27 views

Best method to collect stream macroinvertebrates to assess diversity index

I am looking for a procedure to collect stream invertebrates to asses diversity index. I have used "kick and pick" techniques and have read about using a leaf ball to attract invertebrates, but have ...
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1answer
34 views

What are the negative consequences of a narrowed biodiversity to the planet?

In this question about the fires in the Amazon rainforest, a user responds with It [the Amazon] is still a part of nature and burning it can narrow the diversity of both plants and animals, which ...
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2answers
12k views

What is the maximum altitude where humans can survive?

What is the highest altitude that a human can survive without being pressurized? Let's assume that oxygen and heat/insulation are not the limiting factors? Why I asked.
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1answer
146 views

What is the meaning of “within-season variation”?

I am reading a paper about phenology and climate change for my assignment and I found this concept "within-season variation", can someone explain it to me? and how it is related to changes over time?
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Chickens and dust: Resistance and impacts on pulmonary function

A dusty, dry chicken is a happy chicken. Notably, the concept of dust-bathing, but also the dander they constantly produce which can lead to silicosis in humans where there is overexposure. (Photo: ...
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2answers
836 views

Why is Homo sapiens not categorized as an invasive species?

According to Invasive Species Advisory Committee (ISAC), the definition of the invasive species is “a species that is non-native to the ecosystem under consideration and whose introduction causes or ...
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0answers
22 views

Does the human body absorb any of the humidity in the environment when dehydrated?

I was walking in the rain and feeling thirsty, and I wondered if when the human body is dehydrated it does absorb any of the humidity in the environment by itself.
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1answer
56 views

How deep could a human swim with SCUBA apparatus?

Using normal SCUBA apparatus and wet suit, how much pressure can the human body withstand? This is assuming that they descend as gradually as necessary for their body to make adjustments. What would ...
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8answers
10k views

Why does evolution not make our life longer?

Why does evolution not make life longer for humans or any other species? Wouldn't evolution favour a long life?
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Have there been any efforts to release opossums as a biological control against ticks?

There's plenty of examples of people recognizing opossums as a great ally in controlling tick populations (here's one example). However, I can't find any examples of opossums being intentionally ...
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1answer
209 views

Using Canonical Correspondence Analysis on matrices with missing data

I have a matrix of sites where not all the environmental variables I want to assess were sampled. In other words, there are sites with the whole set of variables sampled, and there are other sites ...
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1answer
1k views

Mesophytic Climax community in succession?

My textbook says that in all cases of ecological succession (xerarch, hydrarch, etc.), the ultimate climax community, assuming constancy of environment, is a mesic community. Xeric or hydric pioneers ...
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40 views

What's the lowest temperature a tardigrade can remain active at?

There's a lot of information floating around the net about how tough they are & what they can survive, like "We now know that some tardigrades can tolerate being frozen to -272.8 °C". But any ...
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38 views

What's the lowest atmospheric pressure a tardigrade can remain active in?

I'm not asking what atmospheric pressures they can survive (we now they can survive the vacuum of space) I'm wondering at what point a deficit of atmospheric pressure would cause them to enter one of ...
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0answers
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What is the thickness of the biosphere?

In other words, what is the vertical distance between the deepest and highest point on Earth where life is found? Life has been discovered at the bottom of the Mariana Trench, 13 km below sea level. ...
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How different is breathing in wildfire smoke in urban areas compared to sitting by a campfire for a night?

The air quality in the Bay Area is currently the worst in the world, due to the devastating Butte County wildfires. I understand smoke inhalation can cause inflammation and respiratory issues, ...
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39 views

Firefly mating displays

I live in the northeast US, and really enjoy firefly displays at dusk in the summer. However, when paying attention this summer, I noticed that the fireflies were not displaying every night, but ...
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1answer
25 views

Environment requirement for human life [closed]

I was wondering, what are the humans needs to fulfill to achieve a human colonisation on mars ? Let me explain, this is for role play game in a futuristic world where humans colonized mars. That ...
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1answer
307 views

How do mushrooms react to being grown in a microgravity environment?

I'll use Agaricus Bisporus as an example mushroom. If cultured in potato dextrose yeast extract agar, will the resulting growth grow in a normal pattern? Will the sporocarps emerge from the surface (...
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1answer
543 views

Are there any animals that maintain white fur year round?

Besides examples of rare albino animals, it seems animals only have white fur during the winter. Additionally, and not coincidentally, the examples I've found live in the northern latitudes with ...
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1answer
128 views

How are epiphytes symbiotic?

I understand epiphytes are not parasitic. But how exactly are they helping the tree on which they grow?
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1answer
55 views

How is mankind important to nature? [closed]

Like mosquito eggs are important for fish, what’s our role in balancing the life on earth or its ecosystem. Please suggest if this question doesn't fit in this community. I am a mechanical engineer ...
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0answers
25 views

How do plastic containers and other thrash end up in the ocean [closed]

There are many photos of the ocean, which in some parts is littered with all sorts of waste, often plastic bags, containers etc. But I just wonder - how do such large amounts land in the ocean/sea? ...
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4answers
175 views

What causes plants in the prunus genus to reach anthesis?

In a related question, I ask how to trick fruit trees into flowering later in the spring by prolonging frozen ground conditions. However, I'm starting to realize that I don't actually understand what ...
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2answers
460 views

Trick fruit trees into flowering later in the spring

There is a common problem with fruit trees in temperate climates where the trees flower before the last frost. Generally speaking, if the tree has flowered, and the temperature drops below freezing, ...
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0answers
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How did hydrophilic plants become established on an isolated island with an arid coastal zone?

I find unconvincing the existing explanation of how several hydrophilic endemic plants became established at St Helena. This is one of the most isolated islands in the world, has an arid semi-desert ...
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3answers
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Are there any oxygen loving bacteria? [closed]

It seems we only found bacteria that hate oxygen. Are there any bacteria that love oxygen and would thrive in high oxygen environment? If it slowed down or stop multiplying in low (as in normal ...
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2answers
129 views

Have there ever been as many mammals as there are now?

I apologize for the weird question, but based on a Google search it looks like this topic hasn't been discussed before. I'm hoping that enough information about population biology is stored in the ...
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1answer
1k views

Which class of animals constitute the largest biomass?

I found here that species-wise it is cow. But, collectively, insects may exceed even mammals. So, which class of animals constitutes the largest biomass?
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Is an animal's body height dependent on its environment?

Imagine the follwing situation: a newly born animal is brought into a small room. This room has no windows, but artifical light to imitate the sunlight. Furthermore, this light behaves like the sun, ...
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0answers
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What is the effect of pesticides on worm growth?

As a new semester begins, we were asked to propose ideas for investigatory projects. Our idea revolves around the effects of pesticides on non-target organisms. Since frequent use of pesticides may ...
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1answer
170 views

How much cost would artificial pollination add to common products (fruits etc.)?

I've read about ecosystem services and their possible valuation - statements like "honeybee pollination service in the US is worth 1.6 billion dollars". Is data available on how this would affect the ...
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2answers
3k views

Does rainwater contain many fewer micro-organisms than river water?

From watching many documentaries on micro-organisms, I can tell water typically contains quite a lot of them. But what about rainwater? (before it hits the ground). I know nothing about any micro-...
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Does overfishing in one ocean hurt fishstock in another?

If there's overfishing in the Atlantic or North Sea - will this affect fish stocks in the Indian ocean? Are there papers on this? The question I'm trying to answer is whether overfishing by developed ...
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1answer
149 views

Can the characteristics of an offspring depend on the locality of its conception also?

Transfer of characteristics from a parent to its offspring is explained in biology. When an adult male and female (of humans) who are displaced from their local environment to another (say, a ...
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2answers
696 views

How does eutrophication yield lower levels of dissolved oxygen? [closed]

Where do the oxygen go? Is it consumed by a particular species? Is just not enough being made? Please explain.
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1answer
58 views

Why haven't environmentally-reactive bodies developed as an evolutionary advantage? [duplicate]

Regardless of region, earth's tilt results in yearly seasonal changes, which organisms deal with through processes like migration/hibernation. Both seem like attempts to avoid the extreme fluctuations....
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1answer
135 views

How quickly do estrogens break down in the environment?

Of all the synthetic hormones we use, estrogens are probably the most common. They are used for birth control as well as hormone replacement therapy. This researcher also shows that there is plenty ...
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3answers
464 views

How much carbon does a forest contain?

Trees in a forest, alongside the fungi, animals and plants that live there in, capture atmospheric carbon dioxide and store it inside their tissues and in the soil as humus. It is possible to ...
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1answer
513 views

Does the process of photosynthesis occur in insectivorous plants? [closed]

Does the process of photosynthesis occur in insectivorous plants? Can you please give me a clear answer and explain to me how? and also can you describe the environment in which they grow ? Thank you
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0answers
55 views

Could trees be engineered to produce rainfall-nucleators?

Scientists are using genetic engineering to make trees produce more terpenes. Is it possible to genetically engineer trees to produce more hygroscopic volatile organic compounds? These trees could be ...
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0answers
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How common is it for environmentally occurring bacillus strain to contain some sort of plasmid?

I am designing a method for testing whether two new bacillus isolates, that are ionic silver resistant, store the silver resistance mechanism on a plasmid or on the chromosome of the bacteria. In my ...
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4answers
28k views

Are trees the only source of large amounts of oxygen?

Trees use carbon dioxide and produce oxygen in the presence of sunlight. But is there any other source? If yes, are trees the most important source of oxygen, or is there any other source which ...
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1answer
103 views

In Darwinian evolutionary theory, does the environment has any role? [closed]

In Darwinian evolutionary theory, does the environment has any role? To state it clearly: Suppose I have an isolated system. First, I place several types of entities (organisms) in an environment. ...
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0answers
1k views

Is it possible to simulate the effects of high altitudes for plants?

Note- I considered asking this on gardening.stackexchange.com but i believe it is better suited for this site since it deals with more complicated material. As I understand it, certain plants (...
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0answers
316 views

Saturation vapor pressure effect on human body [closed]

I found this calculator: http://www.decatur.de/javascript/dew/ It calculates the dew point based on temperature and humidity. In the result it is mentioned the saturation vapor pressure. I barely ...
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1answer
2k views

Are there examples of animals that adapt to their environment very quickly? The phenomenon is called Phenoptic Plasticity [closed]

Evolution and speciation may take millions of years. This made me wonder if there is an animal that adapts itself relatively rapidly to its environment? I don't mean a simple adaptation like a change ...
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0answers
68 views

Birth control hormones in the water? Or not?

This prior question talks about natural estrogen (TL;DR: Months to years): How quickly do estrogens break down in the environment? Ref: http://dx.doi.org/10.1038/485441a A lot of media has said, "...
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1answer
50 views

What are ways to compare the “costs” and “gains” of food production systems?

I'm looking for methodologies to compare the costs a food production requires with the gains it delivers (not in economic terms). I'm aware of energy returned on investment. Are there other methods ...