Bob Schooley, University of Illinois, Jornada LTER Brandon Bestelmeyer, USDA-ARS, Jornada LTER Andrea Campanella, Sierra Nevada Research Institute John.

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Presentation transcript:

Bob Schooley, University of Illinois, Jornada LTER Brandon Bestelmeyer, USDA-ARS, Jornada LTER Andrea Campanella, Sierra Nevada Research Institute John Anderson and LTER Field Crew Temporal Dynamics of Animals across Ecological States

Consequences of grassland-to-shrubland state transitions on abundance, biomass, and energy flux of important consumer group—desert rodents. Importance of bottom-up (precipitation, ANPP) and top-down (predators) effects and potential role of time lags and legacies.

Does Portal generalize to other North American arid ecosystems?

The Ecotone Study: design and sampling Grassland Ecotone Mesquite Shrubland Grassland Ecotone Mesquite Shrubland Grassland Ecotone Mesquite Shrubland 3-ha livetrapping grid on each plot; sampled once per year in October Continuous data from 2004 to present Data set includes captures of 3,685 individuals

Shrub cover alters species biomass and community composition

Strong temporal variation in overall rodent abundance and biomass consistent across ecological states Habitat x Year p = Habitat x Year p = 0.963

Granivores Herbivores Temporal dynamics of trophic groups Periodic colonization by hispid cotton rat

Rodent abundance related to lagged summer precipitation

Habitat p = Summer rain (lag 1) p < Summer rain (lag 1) 2 p < Winter rain p < Rodent abundance related to lagged summer precipitation

Negative effects of winter rain on rodent abundance differ by trophic group Herbivores Habitat p = Summer rain (lag 1) p < Summer rain (lag 1) 2 p < Winter rain p = Habitat p = Summer rain (lag 1) p < Winter rain p = Granivores

Habitat p = ANPP (lag 1) p = ANPP (lag 1) x Habitat p = Primary Production and Rodent Biomass: Legacies and Lags Habitat p = Summer rain p = Winter rain p = Models for predicting ANPP Habitat p = Summer rain p < Winter rain p = ANPP (lag 1) p = Legacy effects sensu Sala et al (g/m 2 )

Year (t-2) Year (t – 1) Year (t) ANPP Rodent abundance and biomass Summer precipitation Winter precipitation Current model of bottom-up effects on desert rodents across ecological states

Future Plans 1.Extend long-term data set on desert rodent communities across mesquite shrub gradients and further explore complexities of bottom-up effects. 2.Determine if considerable unexplained variance is related to top-down effects due to predator distribution and activity. In 2014, established array of camera traps to non-invasively sample carnivores (and lagomorphs). Camera traps deployed on 24 sites representing shrub gradient including 9 sites on the Ecotone study. Two cameras per site (48 total cameras) are operated for 2 months each year from July to September. Response variables: site occupancy probability and photo-activity rate