Travis Haas
Appleton, WI
"Hoover, Jan J ERDC-EL-MS" wrote:
>
> Bill F wrote:
> >>>A friend told me that ducks are good for Daphnia. Apparently the
> "fertilizer" they put into the water will give you a bloom of algal
> growth and as long as there is nothing in the pond to eat the daphnia
> they will thrive.<<<
>
> Jan writes:
> Last Saturday our nature center had its annual Nature Day celebration and I
> was working a "Life Under the Microscope" station. Mid-day, I took a group
> of kids out to a small (6 by 15 ft) puddle of water in the woods where I had
> set a light-trap the night before. It contained a sizable mass of Daphnia
> and other water fleas. Volume of the plankton (out of water) was
> approximately that of a a tennis ball. Its not uncommon to collect
> zooplankton in light-traps (sometimes numbering in 100s or 1000s), but I had
> never seen a mass of water fleas like this before. The kids were impressed.
> They looked at the water fleas in the trap, under the scopes, and then fed
> them to the sunfish and darters in the aquarium.
>
> Pond contained a few chironomids, some crawling water beetles (Haliplidae),
> and a few pond snails, but little else. It was on a moderately steep slope,
> was a foot deep and completely shaded. Nutrent source was a thick layer of
> leaf litter.
>
> Details on light-traps can be found in the latest (Winter 2003) issue of
> American Currents.
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