US Long-Term Ecological Research Network

LTREB Terrestrial data 2012 - current

Pitfall traps measure the activity density of ground-dwelling arthropod communities;Infall traps measure the deposition of flying insectsSticky Cards measure the amount of flying insects with distance from the shoreline.Emergence traps measure the quantity of emerging chironomids
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Pitfall trapsSETUP1. Locate hole and rock from pitfall in previous years near infall rebar2. If necessary remove dirt with trowel or widen hole with bread knife such that 12oz sample cup fits snugly inside with rim even with ground3. With fresh cup, fill with approximately two inches of 50percent ethylene glycol (as above)4. Add a drop of fragrance-free dish soap and swirl5. Place cup in hole6. Break two bamboo skewers in half7. Arrange skewers around cup to support deli lid 0.5 inch from the ground to keep out rainwater8. Place small rock on lid to secure (dont use soil, as it can make counting samples dirty work)FIELD COLLECTION1. Remove rock and lid2. Remove cup and pour through a sieve into another cup (keeping sample in the center of sieve)3. Invert sieve over plastic sample cup and spray into cup with 70percent ethanol squeeze bottle4. Add label and secure lid tightly5. Pour ethylene glycol back into pitfall cup and reset with lid and rock6. Add ethylene glycol until the pitfall container is 1/4 fullCOUTING AND PROCESSING1. Pour sample into clear plastic counting tray with grid2. Count taxa, referring to terrestrial arthropod guide Only Araneae, Opiliones, Trombidiidae, and Coleoptera are counted in pitfalls3. Record counts on pitfall data sheet4. Transfer sample to 20mL scintillation vial using plastic funnel and pipette with mesh tip5. Place the label into the vial6. Record sample information on lid with sharpie7. Archive sample
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Biocomplexity Project: Sparkling Lake Crayfish Trapping

Two approaches for trapping were used in the initial phase of this study: removal trapping and "standardized surveys". Traps set for removal of rusty crayfish were concentrated in areas of the lake to maximize catch rates. In 2001, removals began on 14 August 2001 and traps were emptied daily during the last 2 weeks of August. From 2002 on, crayfish are trapped and removed from mid to late June through late August. Traps are wire mesh minnow traps with openings widened to 3.5-cm diameter.
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