Birds and their role in pond life

[Dennis]

I have two bird baths. When I get water samples it is noted each one will have a separate species and usually (unless we are getting really small) only one species-

Say one will have rotifers. Another time it will have something else. Yes I change the water is why.

I think bird droppings bring the eggs or whatever (or ones that just pass through or even are on the birds perhaps).

My brother who works at a waste water treatment plant and talks to an older guy at his work- The guy often says-

If you have a lake or pond totally isolated from all other water sources- someday there will be fish in it.

Any thoughts anyone?

-Dennis

[Crater Eddie]

When birds walk or bathe in the birdbath or other body of water, they can transfer organisms (or eggs or cysts) carried on their feet or feathers.
CE

[JimT]

Ditto to CE. That is how isolated waters get fish.