Description:
<p>The two invertebrate predators Chaoborus obscuripes and Glaenocorisa p. propinqua become abundant in lakes when fish disappear because of acidification or experimental means. They both consume zooplankton, predominantly cladocerans, which may lead to an increased abundance of copepods relative cladocerans. This development was shown in enclosure experiments where natural zooplankton populations were exposed to these predators. The change in the numerical balance between cladocerans and copepods which takes place in many Swedish lakes during the acidification process may partly result from the increased number of invertebrate predator species consuming zooplankton.</p>