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| nitrofen   | R Documentation   |
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Toxicity of Nitrofen in Aquatic Systems
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Description
~~~~~~~~~~~

The ``nitrofen`` data frame has 50 rows and 5 columns.

Nitrofen is a herbicide that was used extensively for the control of
broad-leaved and grass weeds in cereals and rice. Although it is
relatively non-toxic to adult mammals, nitrofen is a significant
tetragen and mutagen. It is also acutely toxic and reproductively toxic
to cladoceran zooplankton. Nitrofen is no longer in commercial use in
the U.S., having been the first pesticide to be withdrawn due to
tetragenic effects.

The data here come from an experiment to measure the reproductive
toxicity of nitrofen on a species of zooplankton (*Ceriodaphnia dubia*).
50 animals were randomized into batches of 10 and each batch was put in
a solution with a measured concentration of nitrofen. Then the number of
live offspring in each of the three broods to each animal was recorded.

Usage
~~~~~

::

    nitrofen

Format
~~~~~~

This data frame contains the following columns:

``conc``
    The nitrofen concentration in the solution (mug/litre).

``brood1``
    The number of live offspring in the first brood.

``brood2``
    The number of live offspring in the second brood.

``brood3``
    The number of live offspring in the third brood.

``total``
    The total number of live offspring in the first three broods.

Source
~~~~~~

The data were obtained from

Bailer, A.J. and Oris, J.T. (1994) Assessing toxicity of pollutants in
aquatic systems. In *Case Studies in Biometry*. N. Lange, L. Ryan, L.
Billard, D. Brillinger, L. Conquest and J. Greenhouse (editors), 25â€“40.
John Wiley.

References
~~~~~~~~~~

Davison, A.C. and Hinkley, D.V. (1997) *Bootstrap Methods and Their
Application*. Cambridge University Press.
