2,568 results — type: Journal Article ·
Natural selection on floral volatiles and other traits can change with snowmelt timing and summer precipitation
Climate change is disrupting floral traits that mediate mutualistic and antagonistic species interactions. Plastic responses of these traits to multiple shifting conditions may be adaptive, depending on natural selection in new environments. We manipulated snowmelt date over three seasons (3-11 d ea
Immersive Co-production to Inform Ranch Management in Gunnison, Colorado, USA
On the Ground To be successful, producers must interpret environmental stimuli and respond with management actions that help match their production operations to the ecosystem services they depend on. Climate change, and the increased variability that will likely result, may lessen the relevance of
Consequences of pollen defense compounds for pollinators and antagonists in a pollen rewarding plant
Plants produce an array of defensive compounds with toxic or deterrent effects on insect herbivores. Pollen can contain relatively high concentrations of such defense compounds, but the causes and consequences of this enigmatic phenomenon remain mostly unknown. These compounds could potentially prot
Do Stream Mayflies Exhibit Trade-Offs Between Food Acquisition and Predator Avoidance Behaviors?
Organisms often experience trade-offs between behaviors necessary for food acquisition and predator avoidance. In mesocosms and microcosms, we manipulated the risk and resource environments of grazing mayflies (Baetis bicaudatus) common in streams near the Rocky Mountain Biological Laboratory (RMBL)
Biogeochemical characteristics and hydroperiod affect carbon dioxide flux rates from exposed high-elevation pond sediments
While inundated, small ponds (< 1000 m2 area) account for disproportionately large contributions of CO2 efflux to the global carbon budget and also store carbon in anoxic sediments. However, pond hydrology is shifting toward increasingly dry conditions in alpine and temperate zones, which might lead
Captive-breeding of captive and wild-reared Gunnison sage-grouse
Gunnison sage-grouse (Centrocercus minimus) distribution in North America has decreased over historical accounts and has received federal protection under the Endangered Species Act. We investigated captive-breeding of a captive-flock of Gunnison sage-grouse created from individuals reared in captiv
X-ray chemical imaging for assessing redox microsites within soils and sediments
Redox reactions underlie several biogeochemical processes and are typically spatiotemporally heterogeneous in soils and sediments. However, redox heterogeneity has yet to be incorporated into mainstream conceptualizations and modeling of soil biogeochemistry. Anoxic microsites, a defining feature of
Maternal survival costs in an asocial mammal
Maternal characteristics, social dynamics, and environmental factors can all influence reproduction and survival and shape trade-offs that might arise between these components of fitness. Short-lived mammals like the golden-mantled ground squirrel (GMGS; Callospermophilus lateralis ) tend to maximiz
Complex population differentiation in checkerspot butterflies (<i>Euphydryas</i> spp.)
Gel electrophoresis was used to obtain an estimate of the genetic similarity among populations of Euphydryas anicia, Euphydryas chalcedona, and Euphydryas colon in an effort to determine whether they should be considered separate species or arbitrary groupings of populations in a single polytypic sp
Animal-Driven Nutrient Supply Declines Relative to Ecosystem Nutrient Demand Along a Pond Hydroperiod Gradient
New age constraints on the Late Cretaceous lower Williams Fork Formation, Coal Canyon, Colorado
The precise age of terrestrial sediments in the Late Cretaceous Williams Fork Formation of western Colorado is poorly constrained due to a paucity of radiometric data. Sanidine and zircon dating of a volcanic ash encased in coal (i.e., the Coal Canyon ash) within the Cameo-Wheeler coal zone of the l
Colorado River chronostratigraphy at Lee's Ferry, Arizona, and the Colorado Plateau bull's-eye of incision: REPLY
Karlstrom et al. (2013) raise two issues in their Comment related to aspects of the discussion in our paper (Pederson et al., 2013) about the Lee’s Ferry record and incision in the Colorado Plateau. We synthesize evidence for the bull’s-eye pattern of incision over the past 105 yr, finding that it d
Controls from above and below: Snow, soil, and steepness drive diverging trends of subsurface water and streamflow dynamics
Habitat selection in a fluctuating ground squirrel population: Density - dependence and fitness consequences
Investigating individual-based habitat settlement decisions is a central theme in ecology, yet studies that quantify density-dependent habitat selection or tie fitness to resource selection decisions remain rare. We quantified habitat selection in golden-mantled ground squirrels ( Callospermophilus
The dispersal of microbes among and within flowers by butterflies
Abstract Floral microbes, including bacteria and fungi, alter nectar quality, thus changing pollinator visitation. Conversely, pollinator visitation can change the floral microbial community. Most studies on dispersal of floral microbes have focused on bees, ants or hummingbirds, yet Lepidoptera are
The Romance of the Colorado River
Survival of Gunnison sage‐grouse <i>Centrocercus minimus</i> in Colorado, USA
Gunnison sage‐grouse Centrocercus minimus has declined from their historic range and recent monitoring has provided evidence that some populations are continuing to decline. The evaluation of long‐term, population‐specific survival rates is important to assess population stability, and is necessary
Discovery of sexual reproduction in an unusual new species of Stachylina (Trichomycetes)
The shifting importance of abiotic and biotic factors across the life cycles of wild pollinators
Abstract Organisms living in seasonal environments are exposed to different environmental conditions as they transition from one life stage to the next across their life cycle. How different life stages respond to these varying conditions is a fundamental aspect of biology and is critical for unders
PENGARUH EKUITAS MEREK TERHADAP MINAT BELI ULANG PADA KEDAI KOPI BLACK CANYON MALL JAMTOS
Penelitian ini bertujuan untuk mengetahui Pengaruh Ekuitas Merek Terhadap Minat Beli Ulang Pada Kedai Kopi Black Canyon Mall Jamtos Penelitian ini dilaksanakan di Pada Kedai Kopi Black Canyon Mall Jamtos . Model penelitian yang digunakan yakni dengan metode observasi, wawancara, kuesioner dan studi