J. H. Johnson
1995
<p><span>Aspects of the diel feeding ecology of the odonate nymphs </span><i>Anax Junius</i><span> and </span><i>Ischnura verticalis</i><span> and the ephemeropteran </span><i>Callibaetis fluctuans</i><span> were examined over a 24-h period in a small pond. Detrital material was the primary food of both </span><i>A. Junius</i><span> and </span><i>I. verticalis.</i><span> Aquatic insects (mainly </span><i>C. fluctuans</i><span>) were the second ranking prey in the diel diet of </span><i>A. Junius</i><span>, whereas ostracods were the second most important prey consumed by </span><i>I. verticalis.</i><span> Diet overlap between </span><i>A. Junius</i><span> and </span><i>I. verticalis</i><span> was high ([xbar] = 0.76) when detritus was considered but fell to 0.25 when detrital material was omitted. Food consumption by the odonate nymphs was highest at 0800 h and was generally lowest from 2400 h to 0400 h. Conversely, feeding activity by </span><i>C. fluctuans</i><span> peaked between 2400 h and 0400 h with the least feeding occurring at 0800 h. Differences in diel feeding patterns between the ephemeropteran and odonate species may reflect predator avoidance behavior by </span><i>C. fluctuans.</i></p>
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10.1080/02705060.1995.9663433
en
Taylor & Francis
Diel feeding ecology of three species of aquatic insects
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