Objectives. Desertification is hypothesized to have altered the spatial and temporal availability of resources required by the biota. Results of desertification on the Jornada include changes to shrub dominated communities and major soil changes. We hypothesize that these shifts in vegetation have changed resources temporally for many of the consumers.
If grassland systems respond to rainfall without significant lags, but shrub systems do not, then consumer species should reflect these differences. In addition, shifts from grassland to shrubland results in greater structural heterogeneity of the habitats. We have hypothesized that consumer populations, diversity, and densities of some consumers will be higher in grasslands than in shrublands. Diversity and/or densities are hypothesized to be related to the NPP of the sites. Data will be collected for the duration of the LTER program in order to provide data to test these hypotheses. Data for arthropods captured in pitfall traps on LTER III consumer plots at 2 month intervals. Data includes order, family, genus, species, and number.
Data file information for the following Jornada data set: Arthropod Pitfall Traps-III in 5x1 grid at LTER II NPP sites
Data for arthropods captured in pitfall traps on LTER II consumer plots. Data includes order, family, genus, species, and number.
Data file information for the following Jornada data set: Arthropod Pitfall Traps-II in 4x4 grid at LTER II NPP sites
In conjunction with net primary production studies, consumer and faunal studies are conducted at or near NPP sites using pitfall traps. We use live traps, not employing ethylene glycol or other killing/preservative agents, with traps checked once a week at the minimum. Sampling-with-replacement is used with the lizards.
Variables measured include species, sex, recapture status, snout-vent length, total length, weight, and whether tail is broken or whole.
Data file information for the following Jornada data set: Lizard pitfall trap data (LTER-II, LTER-III)