Effect of seasonality and pond permanence on aquatic insect emergence from grassland pondsShow full item record
|Title||Effect of seasonality and pond permanence on aquatic insect emergence from grassland ponds|
|Degree||Master of Science|
|Abstract||The objectives of this study were to examine the effects of seasonality and pond permanence on aquatic insect emergence. Pond permanence is based on 3 pond types: permanent ponds that continuously hold water, semi-permanent ponds that dried and refilled with water, and temporary ponds. We conducted the present study in 14 human-made farm ponds at the Lyndon B. Johnson (LBJ) Grasslands in North Texas. Emergent insects were collected on 9 dates from March through July in 14 ponds. Nine taxonomic groups of aquatic insects were captured in adequate numbers for analysis: Odonata: Anisoptera (dragonflies) and Zygoptera (damselflies); Ephemeroptera (mayflies); Trichoptera (caddisflies); and Dipterans: Tipulidae (crane flies); Chaoboridae (phantom midges); Chironomidae: Tanypodinae (predatory chironomids) and Chironominae/Orthocladinae (herbivorous and detritivorous chironomids); and Ceratopogonidae (biting midges). We found both a seasonal effect and effect of pond type in several taxa, with seasonal flux dependent on emergent insect size and pond permanence.|
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