Stephen H. Jenkins

Learn More
Behavioural syndromes, correlations of behaviours conceptually analogous to personalities, have been a topic of recent attention due to their potential to explain trade-offs in behavioural responses, apparently maladaptive behaviour and limits to plasticity. Using Merriam's kangaroo rats (Dipodomys merriami), we assessed the explanatory power and generality(More)
In many plant communities, there is remarkable variation in seed mass among co-existing species. Plant ecologists have focused on explaining the evolution of this variation but have directed relatively little attention towards examining its significance for species coexistence. This study represents the first empirical attempt to link variation in seed mass(More)
Many models of selection predict that populations will lose variation in traits that affect fitness. Nonetheless, phenotypic variation is commonly observed in natural populations. We tested the influences of competition and spatial heterogeneity on behavioral variation within and among populations of Merriam's kangaroo rats (Dipodomys merriami) and tested(More)
Multidimensional contingency tables provide a powerful new statistical tool for analyzing interactions among several variables in an ecological study. This technique is applied to a study of selectivity in tree-cutting by two colonies of beavers in central Massachusetts.At the Blue Heron Cove colony, selection depends jointly on genus and diamter. Beavers(More)
Granivorous rodent populations in deserts are primarily regulated through precipitation-driven resource pulses rather than pulses associated with mast-seeding, a pattern more common in mesic habitats. We studied heteromyid responses to mast-seeding in the desert shrub blackbrush (Coleogyne ramosissima), a regionally dominant species in the Mojave-Great(More)
(FWS/OBS-82/10), which provides habitat information useful for impact assessment and habitat management. Several types of habitat information are provided. The Habitat Use Information Section is largely constrained to those data that can be used to derive quantitative relationships between key environmental variables and habitat suitability. The habitat use(More)
(Oryzopsis hymenoides) is a perennial bunchgrass found throughout western North America. It is often associated with loose substrates such as the sand typical of sand dunes and other arid habitats (Jones 1990). It shares this habitat affinity with heteromyid rodents (family Heteromyidae), such as kangaroo rats (Dipodomys) and pocket mice (Chae-todipus and(More)
  • 1