Lizard Trapping Data from NPP Sites on the Jornada Basin, 1989-2006

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In conjunction with net primary production studies, consumer and faunal studies were conducted at or near NPP sites using pitfall traps. We used live traps, not employing ethylene glycol or other killing/preservative agents, with traps checked once a week at the minimum. Sampling-with-replacement was used with the lizards. Variables measured included species, sex, recapture status, snout-vent length, total length, weight, and whether tail was broken or whole. This study is complete.

Data sources: 

lizard code list


--Methods of recording (field data sheets, instrumental, etc.):

field data sheets


A grid of 16 pitfall traps was located at each consumer plot. Each trap was 40 cm deep and contained an inner plastic container and funnel. A ceramic tile was placed over each trap. For a 2-week period each sample period, the tiles were raised on one side, and the traps were checked every 3 days in summer and once a week in winter. Individual lizards were taken from the traps, identified, sexed, measured, and weighed. Each lizard was clipped with a unique number using the codes on the diagram on the field data sheets. Toe clipping was done from 1989 to 1995. Starting in March 1995 toe clipping was terminated and lizards were instead marked with a black sharpie marking pen to provide a temporary mark to determine recapture status over a particular 2-week trapping period. A black mark was made posterior to the cloaca on the ventral base of the tail. Trapping grid is a 4x4 with 15 meter interval between trapsw were established in 1995 for LTER-III).

Lizard pitfall studies were conducted quarterly over a period of two weeks: in February-March (following winter NPP), in May-June (following spring NPP), in August, and in October-November (following fall NPP). A. LOCATION: Pitfall grids consisted of sixteen stations (four rows of four traps) located at the following ll sites (the old code, no longer used, is given in parentheses following each site*): T-WEST (TBA), T-EAST (TBB), M-RABB-A (MDA), M-NORT (formerly M-RABB-C (MDC), moved to M-NORT in 1995), M-WELL (MDB), G-IBPE-C (GLC), G-SUMM (formerly G-IBPE-A (GLA), moved to G-SUMM in 1995) G-BASN (GLB), C-SAND-B (CBB), C-CALI (CBA), and C-GRAV (CBD). No pitfalls are directly associated with the following NPP sites: P-COLL, P-SMAL, P-TOBO (because of flooding potential), T-TAYL, or G-SUMM.

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Treatment of data
Data was entered from field data sheets using LOTUS 123 spreadsheet add-in, D.A.V.E., which is a data entry and verification program, prior to 03/16/1995. Beginning 03/16/2000, data was entered and validated from field data sheets using a QuickBasic v4.5 data entry program.


16JUN89 - 23AUG91: 2-week period every month Post-August 1991: 2-week period quarterly (Feb, May, Aug, Oct). This study is complete.

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