EEB202H1 Study Guide - Midterm Guide: Aquatic Insect, Megaloptera, Odonata
25 Nov 2014
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What makes an insect aquatic: requires aquatic habitat for at least one life stage. 11 insect orders: ephemeroptera, odonata, plecotera, megaloptera ,tichoptera = terrestrial adults, aquatic larva, hemiptera, coleoptera ,lepidoptera =terrestrial adult and immature, aquatic adults and immature, neuropteran, diptera =terrestrial adults ,both terrestrial and aquatic immature. Allochthonous: energy in aquatic systems derived from external sources (leaves, woody debris) Autochthonous: energy in aquatic systems derived from internal sources (primary production) Have to deal with oxygen concentrations-demands of oxygen are the same as other air breathers. Depends on type of aquatic environment lenthic = lower levels ,anoxia can occur, lotic=higher levels. Diffusion of oxygen through water is difficult need appropriate mechanisms o2 is 15 ppm in water. Closed tracheal systems: apnuestic spiracles are not functional: cutaneous respiration, tracheal gills, respiratory pigments. Ventillation behaviours: body undulations, gill beating, habitat preference, rectal pump. Adaptations for movement: streamline bodies , suction cups, anal hooks, silk anchors.
