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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12
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1answer
444 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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2answers
6k views

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 ...
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1answer
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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", ...
9
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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-...
8
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1answer
2k 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.
8
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1answer
164 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).
8
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2answers
2k 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 ...
5
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3answers
6k views

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 ...
5
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1answer
596 views

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 ...
5
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3answers
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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 ...
4
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1answer
793 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 ...
4
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1answer
421 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 ...
4
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1answer
2k 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 ...
4
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1answer
96 views

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

I noticed the large structure below today at the edge of a very small pond in northern Taiwan lowlands. It is June and it has rained a bit the past few days, and this 15 cm mud dome with a 5 cm ...
4
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1answer
25 views

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 ...
4
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1answer
76 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?
4
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1answer
116 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 ...
3
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1answer
472 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.
3
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2answers
138 views

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 ...
3
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1answer
112 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 ...
3
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1answer
276 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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0answers
52 views

Strange planarian/leech like creatures found with California blackworms

I've been trying to ID these things myself but to no avail. They came with a shipment of California blackworms from Florida. I've heard so many ID's and apparently it's not uncommon to get these ...
3
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2answers
100 views

Is this aquatic plant duckweed or something else?

This plant has been growing in my pond for quite a time now. It multiplies in large numbers rapidly. Some told me it is duckweed or is it something else?
2
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1answer
65 views

What is a false crocodile?

On the wikipedia page about crocodiles crocodiles are called true crocodiles. Does this mean there are (or where) false crocodiles as well? Crocodiles (subfamily Crocodylinae) or true crocodiles ...
2
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2answers
314 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 ...
2
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1answer
72 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 ...
2
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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/~...
2
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0answers
75 views

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 ...
2
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0answers
67 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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1answer
129 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 ...
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1answer
62 views

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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1answer
74 views

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
966 views

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, ...
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1answer
111 views

Can an Ichthyologist identify this Canadian freshwater fish?

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 ...
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0answers
42 views

What does this skull belong to?

I was cleaning out my pool with a leaf scoop the other day and found a small object, which I assume to be a sort of skull or cartilaginous structure of something that had died. I live in Sydney, ...
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0answers
39 views

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
33 views

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. ...
0
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2answers
865 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.
0
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1answer
88 views

Can someone identify this creature?

I discovered a few of these while cleaning an outdoor fish pond north of Sacramemto California. What is this?
0
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1answer
69 views

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

Many animals like ducks have evolved features to be able to swim. Even not so aquatic animals like a tiger evolved so that its feet can act as paddles. In humans I don't see any direct feature that ...
0
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1answer
166 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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0answers
33 views

How do fish persist in the upper parts of mountainous rivers with waterfalls?

I was recently traveling in a remote mountain region and hiking alongside a very small river. What caught my attention was the fish in the small ponds under the waterfalls. These ponds were just a ...
0
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1answer
25 views

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

I've always wondered what would happen if dead plants and fecal matter lay in chlorinated waters and/or waters treated with strong antibacterials or antibiotics. I've heard that aquarium tanks ...
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0answers
39 views

Is there a peak of life in rivers and lake for ecospheres?

I was considering making an ecosphere. I was wondering if there is a study about when there is the most life in rivers and lakes (microorganisms, insects, plants, fish, etc). I'm in Québec, Canada. ...
0
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0answers
11 views

What strains of algae do freshwater fish, snails, and shrimp prefer?

After a deep clean, my aquarium is algae free for the moment. This is a problem for my algaephage fish, snails (mystery and especially nerites who apparently can't eat wafers), and amano and cherry ...
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0answers
15 views

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
890 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 ...