Zar, in Biostatistical Analysis, has a Tukey-like test that is highly 
recommended. You may need to do it by hand, but it is quite easy.

>Message: 5
>Date: Wed, 23 Nov 2011 18:21:54 +0100
>From: "Jakub Szymkowiak" <qbaszym@tlen.pl>
>To: <r-sig-ecology@r-project.org>
>Subject: [R-sig-eco]  post hoc in Kruskal Wallis
>Message-ID: <C8041F4B78EB487C8707E72114C3F4CF@komp>
>Content-Type: text/plain; format=flowed; charset="iso-8859-1";
>	reply-type=original
>
>Hi,
>does anyone know, how can I perform post-hoc tests (especially Least
>Significant Difference and Sheffe Test) for results from Kruskal-Wallis
>test? In KruskaI-Wallis test I found some significant differences between
>tested groups, but I want to know between which groups this difference is
>really signifficant.
>
>Cheers,
>Jakub

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