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Abstract
<p class="first" id="d4033938e69">A procedure for determining dry weights has been
standardized and applied to a number
of Cladocera, Copepoda and Rotatoria. In most of the Cladocera, regression equations
of the exponential type, relating dry weight to body length, were computed. In the
Copepoda, one equation per suborder was computed, and suggestions for future refinements
are made. In both groups, a fairly satisfactory agreement was found with literature
data where these exist. In both groups, the egg and embryo weight proved to be considerable,
relative to the weight of the adult female. In Rotatoria, 4 species could be dealt
with in size-classes, and their weight increment per unit length was found to be lower
than in the Cladocera and Copepoda. A large number of species were weighed as adults
only. A conclusion applicable to the 3 groups is that, as a rule, limnetic species
weigh relatively less than littoral, periphytic or benthic species. Even within a
species, populations with a more pronounced limnetic way of life weigh less than populations
of littoral nature.
</p>