Questions tagged [limnology]

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

15 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
3
votes
0answers
86 views

Sediment Size and Mayfly (Explanation + Literature)

I am doing investigation into association of sediment size with the movement of mayfly nymphs in a choice chamber, sampling the organisms from a stream. I will be doing a chi square test to determine ...
3
votes
0answers
124 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 ...
2
votes
0answers
16 views

Are there taxonomic keys for members of the family poeciliidae in America?

I wish to know what are the taxonomic aspects necessary for the identification of certain species of poecilids, specifically what is the role in the counting of rays and spines and also the ...
2
votes
0answers
13 views

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

I built a pond in my backyard. Before I even topped it off, I started finding water boatman (Corixidae) swimming in there. Note that the nearest body of water from my home is 30 miles away, and its ...
2
votes
0answers
76 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 ...
1
vote
0answers
25 views

What species left these underwater eggs?

While inspecting some plants planted about 1.5 ft underwater in my pond, I noticed what appeared to be eggs on many of the plants. Note that the eggs are the white, oblong, opaque things. The clear ...
1
vote
0answers
66 views

What kind of animals are these little creatures?

I have 3 tanks. 1 with my fishes and 2 other are technical. The smallest one is 0.5l and I'm using it as trash bin where I put dead plants and algae from main aquarium and it has sand from the see at ...
1
vote
0answers
46 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, ...
1
vote
0answers
39 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
votes
0answers
29 views

Why is this giant water bug out of the water?

I recently took a picture of a giant water bug actually out the water. Every instance that I have seen these of critters they have always been in the water (sometimes even feasting on frogs), but ...
0
votes
0answers
17 views

Is an ephemeral stream in an unflowing state considered a lentic or lotic environment?

I ask this question because I would like to discuss attributes of streams, rivers, bayous, and etc. in a text I'm writing and would like to simply refer to them as "lotic" environments. ...
0
votes
0answers
39 views

WC small organisms ID?

I have reached the end of my Winogradsky Column experiment, but out of interest I have kept them for a little longer. I have noticed small bug- and worm-like organisms appearing in some of my columns. ...
0
votes
0answers
36 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
votes
0answers
16 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 ...
-1
votes
1answer
944 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 ...