2,568 results — type: Journal Article ·
Progressive sensitivity of trophic levels to warming underlies an elevational gradient in ant–aphid mutualism strength
Although species interactions are often proposed to be stronger at lower latitudes and elevations, few studies have evaluated the mechanisms driving such patterns. In this study, we assessed whether, and by which mechanisms, abiotic changes associated with elevation altered the outcome of an ant–aph
Phenotypic plasticity and selection on leaf traits in response to snowmelt timing and summer precipitation
Summary Vegetative traits of plants can respond directly to changes in the environment, such as those occurring under climate change. That phenotypic plasticity could be adaptive, maladaptive, or neutral. We manipulated the timing of spring snowmelt and amount of summer precipitation in factorial co
No evidence that gut microbiota impose a net cost on their butterfly host
Gut microbes are believed to play a critical role in most animal life, yet fitness effects and cost-benefit trade-offs incurred by the host are poorly understood. Unlike most hosts studied to date, butterflies largely acquire their nutrients from larval feeding, leaving relatively little opportunity
Progressive deterioration of pollination service detected in a 17-year study vanishes in a 26-year study
Cannibalism among yellow-bellied marmots
Sixty-five years of change in montane plant communities in Western Colorado, USA
Documenting and predicting patterns of vegetation change over time are challenging due to a lack of sufficiently detailed historical data for comparison. Montane plant communities are expected to respond to anthropogenic disturbance, including climate change, in complex ways dependent on component s
Variation in generation time in Frasera speciosa (Gentianaceae), a long-lived perennial monocarp
Staggered reproduction by an individual's offspring has the effect of insuring survival in an environment with high variability in pollinator effectiveness, germination, and seedling establishment.
Diet and a developmental time constraint alter life-history trade-offs in a caddis fly (Trichoptera: Limnephilidae)
Environmental factors influence variation in life histories by affecting growth, development, and reproduction. We conducted an experiment in outdoor mesocosms to examine how diet and a time constraint on juvenile development (pond-drying) influence life-history trade-offs (growth, development, adul
Is Plant Fitness Proportional to Seed Set? An Experiment and a Spatial Model
Individual differences in fecundity often serve as proxies for differences in overall fitness, especially when it is difficult to track the fate of an individual's offspring to reproductive maturity. Using fecundity may be biased, however, if density-dependent interactions between siblings affect su
Variation in pollen size, fertilization ability and postfertilization siring ability in Erythronium grandiflorum
Effect of Keystone Mine effluent on colonization of stream benthos
Journal Article Effect of Keystone Mine Effluent on Colonization of Stream Benthos Get access Barbara L. Peckarsky, Barbara L. Peckarsky 2 Rocky Mountain Biological Laboratory, Crested Butte, Colorado 81224 2 Present address: Entomology Department, Cornell University, Ithaca, NY 14853. Search for ot
Leaf physiology reflects environmental differences and cytoplasmic background in <i>Ipomopsis</i> hybrids
Natural hybridization can produce individuals that vary widely in fitness, depending upon the performance of particular genotypes in a given environment. In a hybrid zone with habitat heterogeneity, differences in physiological responses to abiotic conditions could influence the fitness and spatial
Plant chemical mediation of ant behavior
Ants are ecologically dominant members of terrestrial communities. Ant foraging is often strongly associated with plants and depends upon associative learning of chemicals in the environment. As a result, plant chemicals can affect ant behaviors and, in so doing, have strong multi-trophic indirect e
Are white-crowned sparrow badges reliable signals?
The petrology and geochemistry of the Handkerchief Mesa mixed magma complex, San Juan Mountains, Colorado
Integrating macroecological metrics and community taxonomic structure
John Harte,1* Andrew Rominger2 We extend macroecological theory based on the maximum entropy principle from species level to and Wenyu Zhang3 higher taxonomic categories, thereby predicting distributions of species richness across genera or families and the dependence of abundance and metabolic rate
Constraining Bedrock Groundwater Residence Times in a Mountain System With Environmental Tracer Observations and Bayesian Uncertainty Quantification
Abstract Groundwater residence time distributions provide fundamental insights on the hydrological processes within watersheds. Yet, observations that can constrain groundwater residence times over broad timescales remain scarce in mountain catchment studies. We use environmental tracers (CFC‐12, SF
Costs and benefits of alternative food handling tactics help explain facultative exploitation of pollination mutualisms
AbstractMany mutualisms are taken advantage of by organisms that take rewards from their partners but provide no benefit in return. In the absence of traits that limit exploitation, facultative exploiters (partners that can either exploit or cooperate) are widely predicted by mutualism theory to cho
Removing flowers of a generalist plant changes pollinator visitation, composition, and interaction network structure
Abstract Pollination is essential for ecosystem functioning, yet our understanding of the empirical consequences of species loss for plant–pollinator interactions remains limited. It is hypothesized that the loss of abundant and generalized (well‐connected) species from a pollination network will ha