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43 votes
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Why do diseases in the tap water of developing countries affect people from developed countries more?

You can expect that someone drinking from a water source regularly will develop immunity to the pathogens in that water source by being repeatedly exposed to them. However, it's not quite right to say ...
Bryan Krause's user avatar
  • 46.1k
18 votes
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Does human organism consume water or is it only used as solvent?

Humans and all other animals actually are net producers of water ("metabolic water") by oxidizing sources of energy including fats, proteins, and carbohydrates - effectively the opposite of the ...
Bryan Krause's user avatar
  • 46.1k
9 votes
Accepted

What are these tiny creatures swimming around my aquarium?

Hard to tell because of the poor picture/video quality, but almost immediately the body shape, distinct "face", size and behavior made me think of a small invertebrate animal called a ...
theforestecologist's user avatar
7 votes
Accepted

Nutrient limitation in terrestrial and freshwater ecosystems

The traditional explanation for this is that nitrogen compounds are more mobile than phosphorus compounds. As a result, nitrogen is more likely to flow through terrestrial ecosystems and accumulate in ...
Nathan's user avatar
  • 176
6 votes
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What terrestrial trait makes cetaceans so successful in an aquatic lifestyle?

Thermoregulation and echolocation both depend on evolutions that occurred on land and seem to be less accessible to fish than to the ancestors of mammals. The heat capacity of water is much greater ...
timeskull's user avatar
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6 votes
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Do electric eels produce current as they just move about, and how/why?

You are right - the 800 Watts are not constantly produced: There are three types of electrical discharge: (i) low voltage (ii) high voltage doublets or triplets and (iii) high voltage high frequency. (...
dtadres's user avatar
  • 666
6 votes
Accepted

What is a false crocodile?

If you keep reading the next sentence it makes clear what is meant (emphasis mine): Crocodiles (subfamily Crocodylinae) or true crocodiles are large semiaquatic reptiles that live throughout the ...
Bryan Krause's user avatar
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6 votes
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What is this plant/creature in my freshwater aquarium?

That is a hydra. They are a kind of jellyfish, and as such they do technically have stinging tentacles. However, they're also very small, so they're not a danger to most fish or shrimp. If you're ...
Resonating's user avatar
  • 4,078
6 votes

Land Shrimp Sighting (Western Europe): What is it?

The size (~2 inches), broad "quadrate" head, and long posterior abdomen leads me to believe this is a relatively large larva of a Predaceous Diving Beetle (family Dytiscidae). The larvae ...
theforestecologist's user avatar
5 votes
Accepted

Why are beavers not considered marine mammals?

Beavers are not Marine Mammals According to Wikipedia, Marine is an adjective meaning of or pertaining to the sea or ocean: as Beavers can be found in a number of freshwater habitats, such as rivers, ...
J..y B..y's user avatar
  • 224
5 votes
Accepted

What is (are) the species responsible for Lake Natron red waters?

As far as I can tell, no one has looked (at least not indexed on PubMed) in Lake Natron specifically for algal/bacterial/archaeal species. Lake Natron is a Soda Lake (high pH and high salinity) and is ...
bob1's user avatar
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4 votes
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Where does the mass come from when you grow plants in water?

Short answer Plants with storage compartments can grow for extended periods on water alone. Background It indeed seems the question is indeed different from the suspected dupe after all. According ...
AliceD's user avatar
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4 votes
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What kind of fish is this? Spotted or largemouth?

This looks like a spotted bass (Micropterus punctulatus). Here's an image showing some quick differences between some common bass species: Using the above photo and this source to guide our judgment ...
theforestecologist's user avatar
4 votes
Accepted

Which animal dug this 5 cm diameter hole deep into mud and build a large mound around it?

A crustacean (land crayfish). There are a lot to choose from. http://web.nchu.edu.tw/~htshih/crab_fw/fw-crabe.htm
Polypipe Wrangler's user avatar
4 votes

How many Watt-hours can an electric eel produce in a day?

This research states that an eel whose size is 90 cm can provide 6.05 mW, which is 145 mWh every day. They say you'd need 165 eels to be able to read for 24 hours using a 1W lightbulb like the one on ...
bandybabboon's user avatar
  • 10.4k
4 votes
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Looking for specific alga and a recently extinct (or rare) marine animal from the same region for novel

Yes, at least some of the genome has been sequenced for the Great Auk (Pinguinis impennis): Taxonomy browser @ NIH (click on the 45 next to the Genomic Sequences title). There appear to be 45 ...
bob1's user avatar
  • 12.5k
3 votes
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Are there any natural forms of aquatic vegetation which do not stand up in water?

Yes there are many aquatic plant species which do not stand up in water. You need to look at the lifeform of the plants, such as introduced by Raunkiaer ( https://en.wikipedia.org/wiki/Raunki%C3%...
botaflo's user avatar
  • 358
3 votes
Accepted

The effect of depth on net primary production in aquatic ecosystems

After a quick glance at the book "Light and Photosynthesis in Aquatic Ecosystems" by Kirk (2010), I think that the cause for the productivity dip towards the surface partially lies in photoinhibition, ...
fileunderwater's user avatar
2 votes

How does eutrophication yield lower levels of dissolved oxygen?

From Wikipedia: Eutrophication arises from the oversupply of nutrients, which leads to over growth of plants and algae. After such organisms die, the bacterial degradation of their biomass consumes ...
theforestecologist's user avatar
2 votes

Do unique communities of bacteria form inside water storage in plants?

As stated in Plant Signal Behav. 2010 Dec; 5(12): 1568–1570: Phytopathogenic bacteria do not enter plant host cells, but proliferate in the intracellular space. But as they can reach the apoplast,...
cako's user avatar
  • 141
2 votes

Can someone identify this creature?

This is a Burrowing Mayfly nymph (order Ephemeroptera), more than likely of the family Ephemeridae. The Bugguide site has very few photos of nymphs, but you'll find a near miss here (the species ...
user32396's user avatar
  • 548
2 votes

Did humans evolve the ability to swim? Or is it just luck that we are able to swim?

The Jane Goodall website says: "You’ll rarely see a chimp paddling about in the water as they don’t like to swim. Their low body fat ratio causes them to sink and their top heavy body composition ...
bandybabboon's user avatar
  • 10.4k
2 votes

What terrestrial trait makes cetaceans so successful in an aquatic lifestyle?

Advantages of air breathing over gills? Keeping in mind water-breathing animals could still evolve lungs. Not being vulnerable to parasites and diseases of the gills, which are obliged to have blood ...
Polypipe Wrangler's user avatar
2 votes

Are there adaptations in tropical fish to compensate for less oxygen in water?

Many can breath air directly ; examples - bettas, gouramis, paradise , some catfish . No doubt others that do not come to mind .
blacksmith37's user avatar
2 votes
Accepted

Are there adaptations in tropical fish to compensate for less oxygen in water?

Fish that live in cold water for most of the year actually have particularly strong hypoxia-tolerance adaptations, i.e. from summer heatwaves and algal blooms, compared to fish that are better ...
bandybabboon's user avatar
  • 10.4k
1 vote
Accepted

How many Watt-hours can an electric eel produce in a day?

I found some information on how much energy an electric eel can theoretically produce for an hour, but not per day. Thanks to this excellent answer from dtrades and my own research. Apparently, ...
Johnny's user avatar
  • 273
1 vote

How could a water boatman bug get in a place with no water?

In animals some species migrate, some hibernate and some aestivate to overcome the unfavorable conditions such as desiccation. Some aquatic organisms enters into diapause during unfavorable conditions....
Cohensius's user avatar
  • 111
1 vote

How can animals that rely on SONAR not see color?

Color is a characteristic of visible electromagnetic spectrum, see the graph here. Electromagnetic means here that it has the same nature as radio-waves, X-rays, and gamma radiation, whereas visible ...
Roger V.'s user avatar
  • 3,862
1 vote
Accepted

Will ammonia continue to accumulate in an aquarium tank if a strong antibacterial or chlorine is added to the water?

A very large part of the bacteria and fungi will die so very few biological processes will continue in the tank if you add chlorine or antibacterial chemicals. Ammonia will slowly outgas from the ...
trond hansen's user avatar
1 vote

Is this aquatic plant duckweed or something else?

That looks very much like a duckweed. The multiple roots rule out most genera within this group and so this is probably a Spirodela. The apparently relatively large size and red undersides are ...
tyersome's user avatar
  • 5,598

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