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Re: mail-order daphnia sources
Many thanks to all the folks who made various helpful suggestions re
Daphnia vendors. Turned out I had an obsolete URL for l.f.s.
The correct URL is: http://www.lfscultures.com/
Wright, I took up your challenge and located several interesting Daphnia
websites:
General biology or natural history of Daphnia:
http://it.stlawu.edu/~x7kgarv/
Excellent Canadian site about all the Cladocera (water fleas), including
Daphnia. Includes section with more than you ever wanted to know about
water flea taxonomy:
http://www.cladocera.uoguelph.ca/
website advertising a CD-ROM for distinguishing the 34 known species of
Daphnia in North America:
http://www.tangentscientific.com/producttext/5361daphnia.htm
A "Biology Classics Gallery" website with lots of info, including short
movies:
http://ebiomedia.com/gall/classics/Daphnia/feature_main.html
How daphnia (usually either D. magna or D. pulex) is used as a standard
freshwater bioassay test organism to check the toxicity of potential water
pollutants:
http://ei.cornell.edu/toxicology/bioassays/daphnia/
http://www.pollutech.com/papers/p2.htm
Ostracods (Cypris is a common genus) are bottom-living or
substrate-oriented crustaceans that move fairly smoothly along the bottom,
not jerkily, and are built something like a shrimp within two heavy
clamshell-like structures (which make it hard for some smaller fish to eat
them) and are often collected along with Daphnia. Copepods (Cyclops and
Calanus are common genera) are tiny tadpole-shaped crustaceans that move in
short darts along the sides of the collecting container or the aquarium.
Females have paired external egg sacs that hang off each side of the tail.
Good fish food, but although many types filter algae, bacteria, and other
particulate matter out of the water as Daphnia does, some types are
predaceous and can attack and kill recently-hatched fishes. Scuds (Gammarus
is a common genus) are somewhat shrimp-like and flattened from side to
side. They are also called amphipods, another type of crustacean, get up to
about a quarter inch in size, and tend to swim about intermittently but
spend most of their lives living and feeding on the bottom or in aquatic
vegetation.
--Neal
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>Date: Wed, 06 Sep 2000 09:19:03 -0700
>From: Wright Huntley <huntley1 at home_com>
>Subject: Re: mail-order daphnia sources
>neal foster wrote:
>>
>> The l.f.s. website seems to have disappeared. Where are people getting
>> their live Daphnia starter cultures these days? Interested in D. pulex,
>> especially.
>>
>I don't think I have *pulex* but how am I to know? Neal, could you do us a
>favor and give a brief note on how to tell Daphnia from Ostracods, etc. and
>how to tell the major species apart within Daphnia?
>
>Is there a site that gives definitive pictures, sizes, etc.?
>
>Wright
>
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