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Questions tagged [limnology]

The science of inland waters, posts on Biology SE should focus on the biological aspects of this discipline.

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What are these tiny creatures swimming around my aquarium?

I was checking out my aquarium today, and decided to scoop out a water sample and take a look at it more closely. What I discovered were numerous, very, very tiny white worms (?) swimming around in ...
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Why doesn't alum coagulate my cyanobacteria?

My collected rainwater has a pronounced blue-green tint which I believe to be due to the presence of cyanobacteria. I have been trying to remove the cyanobacteria using aluminium sulphate, but it ...
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1answer
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Do unique communities of bacteria form inside water storage in plants?

I assume that plants, like animals, have an ability to fight off bacteria that invade their cells (support: here and here. However, water often harbors quite a bit of bacteria in even unsuspecting ...
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Shrimp in rainwater puddles [duplicate]

After rain, we often find shrimp-like creatures in the puddles left on our concrete patio. We have also found them in the cat's water bowl (on the same patio). They are pink in color, and around 3mm ...
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0answers
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What is this trilobite-like creature?

This was found under a rock in a freshwater creek in Maryland. Stayed like this for while, then stretched out long, then contracted, and then JUMPED off the rock back into the water. Looks like a ...
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1answer
2k views

Does human organism consume water or is it only used as solvent?

Dune (novel) describes a body suit called Stillsuit: a stillsuit is a "body-enclosing garment" of Fremen design which performs the "functions of heat dissipation and filtering bodily wastes", ...
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Correlation between nitrogen excretion and fish diseases

I am curious whether if any fish disease will cause an increase or decrease a fish's nitrogen waste. If it increases, will this cause an increase in ammonia of the fish tank water?
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2answers
209 views

Where does the mass come from when you grow plants in water?

How do plants like green onions seem to grow forever when put in jar of water? I understand that plants get a lot of their carbon from the air (as per this question) but surely they need more than ...
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1answer
122 views

I want to know the name of this water plant?

Above is an image of an unknown plant. It grows without any care.
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1answer
66 views

Wondering if a Ichthyologist can identify this fish for me

This will be very simple for a lot of you! But I been getting mixed answers about his catch. Is this a chinook salmon or brown spotted trout? Caught in Angus, Ontario, Canada. (Hwy 90 Bridge) I ...
4
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1answer
226 views

What is this plant/creature in my freshwater aquarium?

I've been noticing these really small creatures (or plants, I'm unsure) in my tank recently. They measure less than 1cm in length and I've only seen them at the bottom of my tank; some attached to the ...
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0answers
66 views

Why do we drink clean water [duplicate]

Most of the street/feral animals (cats, dogs, cows, some wild animals too) drink tap water or dirty water, but it doesnt seem to affect them. So, why do humans drink pure water?
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Flower/Plant Identification

Could anyone please identify this flower/plant found on the semi-shaded banks of a river in East Ireland? It was located near Japanese Knotweed and looks quite similar to this.
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3answers
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Do lobsters possess a nervous system to feel pain?

I was reading an article, which it mentions that lobsters do not have a nervous system: Lobsters have very poor eyesight and no nervous system. They walk slowly on the sea floor but are capable ...
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1answer
160 views

What kind of bug or insect is this?

One of my friends has seen this insect-like species in water in the mountainous area in Iran (near Qom).
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1answer
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How effective is water purification by boiling?

Does boiling water kill all harmful bacteria, fungus etc from water, or it is just a myth and removes only few of microorganism?
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1answer
654 views

Why sea water fish can't survive in Fresh water?

Why the sea water fish can't survive in fresh water? What really happens to the fish if it get into fresh water from sea water. What are the possible reason... Does it really depends osmotic ...
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1answer
69 views

Aquatic forest insect identification [closed]

I found it in the forest but I've never seen anything like it so I took it home to see what it is. Does anyone know?
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2answers
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What kinds of bacteria live in water bottles?

I've always heard not to re-use disposable plastic water bottles. According to this Huffington Post article, the reason is because: everyday wear and tear from repeated washings and reuse can ...
12
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1answer
301 views

What is the non-local impact of a large-scale destruction of coral reefs?

I'm reading today that the "bleaching" of coral reefs is progressing with unanticipated speed. Bleaching is occurring at a scale which was previously believed to be decades in the future. Bleached ...
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0answers
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Oxygen supply in a trickling filter

I'm using a 300l/h trickling filter consisting of 4 round chambers in vertical alignment with 11cm diameter, 5cm height and 5cm distance for the trickling (100 to 500 holes per level) in a 15cm pipe. ...
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2answers
2k 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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1answer
204 views

What kind of fish is this? Spotted or largemouth?

I don't know if this is a weird looking largemouth bass or a spotted bass. It was caught in southern Oklahoma. Please help! Thanks.
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2answers
544 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
100 views

Staying underwater: would mutual rebreathing help?

If two people want to stay underwater for as long as possible, could they last longer if they exchange breaths in turns (ie: through a simple tube or mouth-to-mouth) than if they simply hold their ...
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1answer
1k views

Nutrient limitation in terrestrial and freshwater ecosystems

In terms of primary production, it is often described in textbooks that nitrogen is the most limiting nutrient in terrestrial ecosystems, while phosphorus is the most limiting nutrient in freshwater ...
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3answers
2k views

The effect of depth on net primary production in aquatic ecosystems

The figure shows the relationship between the water depth and net primary production (=P-R). I want to know why the production (P) initially increases with water depth near the surface? I have seen ...
2
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1answer
57 views

On the premise of crop rotation, is there similarly a plant or organism able to provide nutrients into its environment that exists in water biomes?

I know of the simple concept of crop rotation, and being able to use certain plants to replenish soil, and was wondering if there is a plant or organism that can or does function similarly but in ...
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1answer
1k views

What kind of fish is this?

What sort of fish is the big one in this picture? I saw it in an aquarium so I don't really know anything about its habitat.
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1answer
101 views

Why is flash light harmful to what aquatic life forms?

When visiting an aquarium, it's often not allowed to take photographs with a flashlight on. It is said that the flash light with very high intensity is harmful to the displayed life forms. I respect ...
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1answer
121 views

What are these curious cetaceans?

At the beginning of the superb documentary film “Un jardin d’Eden sous les mers” (“A garden of Eden under the seas”) [1], we see a group of curious cetaceans. At about 1 min. What are these ...
4
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1answer
618 views

What is the significance to life of the anomalous properties of water? [closed]

I have heard that the anomalous properties of water - e.g the fact its solid form is less dense than its liquid form - is extremely important. In fact, some people have gone so far as to tell me it ...
3
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1answer
214 views

What would be the impact of depositing limestone in the oceans (to reverse acidification) on ocean life forms and biodiversity?

This question asked: What is the evidence it is feasible to reverse ocean acidification by adding large quantities of a base (bicarb soda)? The result was: Danny Harvey of the University of ...
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2answers
1k views

Effect of extremely hard water on marine life?

When researching water quality standards, I found that a minimum and maximum was set for water hardness. Several sources also state that water can in fact be too hard. The question is how does hard ...
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1answer
44 views

Calculation of saturation of carbon in surface waters

I've been looking at some journals lately that look at carbon emission from lakes where some lakes act as sources and other act as sinks. The paper that I have been looking at is http://www3.nd.edu/~...
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2answers
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Do dolphins really sleep?

I have always wondered, if dolphins sleep with one eye opened, do they really sleep at all? According to this article dolphins indeed shut down their brains. I already googled it. No help from ...
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1answer
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Is it true that oxygen has a diffusion rate in air 10,000 times greater than in water? [closed]

According to the Wikipedia page on the design of gills, oxygen has a diffusion rate in air 10,000 times greater than in water. Is that true? The WP entry refers to: M.B.V. Roberts, Michael Reiss, ...