Dispersal affects a wide array of ecological and evolutionary processes, but has been difficult to estimate empirically. A 15 Nitrogen stable isotope enrichment technique was used to passively mark all developing Callibaetis ferrugineus hageni (Eaton) mayfly larvae in a beaver pond that had previous

1. In streams, mayflies (Order Ephemeroptera) are at risk from fish feeding visually in the water column. The effect of fish odour on the behaviour of Baetis bicaudatus from a fishless stream and a trout stream was investigated in four large oval tanks supplied with water from the fishless stream.2.

Anaerobic methane oxidation exerts a key control on greenhouse gas emissions 1 , yet factors that modulate the activity of microorganisms performing this function remain poorly understood. Here we discovered extraordinarily large, diverse DNA sequences that primarily encode hypothetical proteins thr

We investigated the effects of prey size and type (sedentary vs mobile) on prey preference in a predaceous stonefly, based on choice experiments and observations of the predator-prey interaction. We presented three size classes of black fly larvae (Prosimulium) to various sizes of the perlid stonefl

Climate warming-induced plant species loss is likely to be nonrandom and based on species-specific susceptibility to changing climate. We examined the ecological consequences of losing shallow-rooted forbs, a group of species we predict to be adversely affected by climate change based on their respo

Book Review| April 01 1982 A River No More: The Colorado River and the West A River No More: The Colorado River and the West, Philip L. Fradkin. Melvin T. Smith Melvin T. Smith Search for other works by this author on: This Site Google Utah Historical Quarterly (1982) 50 (2): 203–204. https://doi.or

Climate in subalpine meadows of the Rocky growing season drought conditions. Manipulating Mountains can be characterized by an early (fore- the strength of the foresummer drought by watering summer) drought that occurs after snowmelt (May) revealed that the timing of growing season pre- and lasts un

Movements of Colorado squawfish Ptychocheilus lucius were studied by radio-tracking and recapturing tagged fish in the Green River basin of Colorado and Utah, 1980–1988. Of 153 fish tracked, 63% were highly mobile: 41% migrated to known spawning sites, 11% migrated to suspected spawning sites, and 1

This study addresses the field-scale architecture and static connectivity of fluvial sandstones of the lower Williams Fork Formation through analysis and reservoir modeling of analogous outcrop data from Coal Canyon, Piceance Basin, Colorado. The Upper Cretaceous lower Williams Fork Formation is a r

Seed set in the perennial larkspur Delphinium nelsonii is greater in crosses between plants growing an intermediate distance apart than in shorter and longer crosses. Since crossing distance is an attribute of a specific combination of parents, its effect on seed set represents an interaction of the

A. tigrinum larvae from two ponds in the Elk Mountains of western Colorado were found to eat a wide variety of foods, including a total of 42 classes, mostly of various littoral, benthic, and planktonic arthropods. Most common animals (between 0.5 and 20 mm in length) in these ponds were eaten in pr

Upper Cenozoic terrestrial basin-fill sedimentary and basic volcanic rocks are common in the 20,700 km2 Basalt area, which includes parts of the Gore, Sawatch, and southern Park Ranges, Elk Mountains, Grand Mesa, and White River Plateau. Principally on the basis of whole-rock K-Ar ages from basalt f

Spatiotemporal variation in age-specific survival rates can profoundly influence population dynamics, but few studies of vertebrates have thoroughly investigated both spatial and temporal variability in age-specific survival rates. We used 28 years (1976-2003) of capture-mark-recapture (CMR) data fr

The slow-fast continuum is a commonly used framework to describe variation in life-history strategies across species. Individual life histories have also been assumed to follow a similar pattern, especially in the pace-of-life syndrome literature. However, whether a slow-fast continuum commonly expl

AbstractGlobal models project impending climate changes that could significantly alter plant species composition in ecosystems. Climate manipulation experiments provide an opportunity to investigate such effects. Here we describe and apply a method for extracting the age‐detrended growth rate of sag

The circannual cycle of MR is suggested as the driving force underlying the cycles of food consumption and Bm in marmots, which corresponds well with observed differences in above-ground activity between the two populations.

• Premise of the study: Numerous long‐term studies in seasonal habitats have tracked interannual variation in first flowering date (FFD) in relation to climate, documenting the effect of warming on the FFD of many species. Despite these efforts, long‐term phenological observations are still lacking

Abstract Understanding the time water takes as it moves from rain or snowmelt through the terrestrial system to arrive as stream discharge, or evapotranspiration (ET) is an important hydrologic quantity. We develop a Lagrangian particle tracking method to capture transient residence times from sourc

AbstractParasites can cause a loss of fitness for their hosts, potentially influencing social behaviour patterns of the host that promote or hinder parasite transmission. I studied yellow‐bellied marmots (Marmota flaviventris) and their ectoparasites to determine if ectoparasites reduce the fitness

The claim that temperature, rather than food abundance, determines the alternative life history sequences followed by high elevation populations of A. tigrinum is substantiated.