Abstract Leaf temperature (Tleaf) influences rates of respiration, photosynthesis, and transpiration. The local slope of the relationship between Tleaf and Tair, β, describes leaf thermal responses. A range of values have been observed, with β β = 1 indicating poikilothermy where Tleaf tracks Tair,

Surveys in 1974 of bumble bee species distributions along elevational gradients (Pyke 1982) were revisited to reevaluate the original conclusion that coexistence of bumble bee species can be ascribed to niche differentiation, primarily on the basis of proboscis lengths and the associated corolla len

White adipose tissue biopsies and plasma samples were obtained from hibernating yellow-bellied marmots (Marmota flaviventris) maintained in the laboratory. In addition, biopsies and plasma samples were obtained from normothermic animals in the field and laboratory. Measurement of plasma free fatty a

Seed set after selfing in E. grandiflorum is often reduced relative to seed set after crossing; however, the compatibility patterns seen are not due to genes of major effect (i.e., S alleles). There is quantitative variation in the proportion of pollen tubes reaching the base of the style after both

Abstract Despite a global footprint of shifts in flowering phenology in response to climate change, the reproductive consequences of these shifts are poorly understood. Furthermore, it is unknown whether altered flowering times affect plant population viability. We examine whether climate change‐ind

AbstractGenetically based trait variation across environmental gradients can reflect adaptation to local environments. However, natural populations that appear well-adapted often exhibit directional, not stabilizing, selection on ecologically relevant traits. Temporal variation in the direction of s

AbstractAnimals must allocate some proportion of their time to detecting predators. In birds and mammals, such anti‐predator vigilance has been well studied, and we know that it may be influenced by a variety of intrinsic and extrinsic factors. Despite hundreds of studies focusing on vigilance and s

The phototrophic flagellate, Colacium vesiculosum (Euglenophyceae), lives externally on freshwater zooplankton. In experimental tanks with supplemental nutrients, epibiotic prevalence (% zooplankters infested with epibionts) was not consistently different from control. Experimental reduction of the

D. M. Theobald, H. Gosnell, W. E. Riebsame, Land Use and Landscape Change in the Colorado Mountains II: A Case Study of the East River Valley, Mountain Research and Development, Vol. 16, No. 4 (Nov., 1996), pp. 407-418

AbstractTo understand how redox processes influence carbon, nitrogen, and iron cycling within the intrameander hyporheic zone, we developed a biotic and abiotic reaction network and incorporated it into the reactive transport simulator PFLOTRAN. Two‐dimensional reactive flow and transport simulation

We determined the distance travelled by drifting nymphs of the mayflies Baetis and Cinygmula to add to existing knowledge of factors influencing drift distance, and to investigate the influence of drift-exiting behavior upon drift magnitude and periodicity. Individuals were released into the water c

This datasheet on Marmota flaviventris covers Identity, Distribution.

Abstract: To investigate possible biological effects of acidic deposition in the western United States, we performed population censuses and dose‐response experiments at a subalpine watershed in the Rocky Mountains of Colorado, An adult tiger salamander (Ambystoma tigrinum nebulosum) population decl

Global change drivers, in particular climate change, exotic species introduction, and habitat alteration, affect insect pollinators in numerous ways. In response, insect pollinators show shifts in range and phenology, interactions with plants and other taxa are altered, and in some cases pollination

Scientists vigorously debate the degree to which rock varnish is formed through the actions of microorganisms. To investigate this enigma, we utilized a three‐pronged approach that combined (1) culture‐independent molecular methods to characterize bacterial communities associated with varnish that c

The breeding systems and stationary spatial distributions of animal-pollinated flowering plants are consistent with Wright's models and such systems have proved excellent for the study of neighborhood size, because gene dispersal can be estimated directly by measuring pollinator movements and seed d

Two sets of hypotheses based on sodium limitation have been proposed to explain the sexual dimorphism in puddling hchaviour, which suggested that males have a greater need for sodium in neuroniuscular activity because they spend a larger time in flight than females.

The evidence did not support the acoustic adaptation hypothesis for these marmot species, and factors other than maximizing long-distance transmission through the environment may be important in the evolution of species-specific marmot alarm calls.