1/30/2024 0 Comments Pitfall trap arthropod![]() If there is water in the cup (from rain or landscape watering), a piece of plankton netting is used to filter out the water. Sometimes the pipes get dug out of the ground by animals or humans and need to be replaced.ĭo not set traps when it is raining, when heavy rain is expected, or when flood irrigation is due. Take a few extra 4" sewer pipes into the field each time. ![]() It does not matter in what order the pitfall sites are visited but the sites are grouped geographically. Traps are set (opened) on Day 1 and collected (closed) on Day 4 each quarter (January, April, July, and October). During a given collection cycle, a maximum of two ag sites can be disregarded if the collection is not successful (due to irrigation, tilling, or other disturbance). Plastic cups are doubled-up and placed in each hole, flush with the ground, and then removed after collection. For each visit, a fresh trap line is dug into the dirt. Agricultural Sites (currently there are none):Īt agricultural sites, there are no pipes in the ground. Lids are spray-painted green for traps located in lawns. When not set, traps are covered with a 4" sewer pipe cap (lid). Traps are usually ~5 meters apart on a straight line, except at residential sites. If the number drops below this, please let the CAP LTER Site Manager know. The trap lining and the plastic cup should be flush with the ground. Traps are lined with 4" PVC sewer pipe cut to a length of 5 inches, which will accept an 18oz plastic cup. Pitfall trap holes can be cored using a small soil corer or an auger, usually in turf, or dug out using a pick or a soil knife along with a sledge hammer and a small spade, in more difficult-to-excavate soil such as desert hardpan.
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