These data were compiled to explore the foraging ecology of Rainbow Trout (Oncorhynchus mykiss) in the Colorado River, Grand Canyon, Arizona. These data represent samples characterizing the availability of drifting invertebrate prey (hereafter, drift) and use of these invertebrate prey by rainbow tr

These data were compiled to explore the foraging ecology of Rainbow Trout (Oncorhynchus mykiss) in the Colorado River, Grand Canyon, Arizona. These data represent samples characterizing the availability of drifting invertebrate prey (hereafter, drift) and use of these invertebrate prey by rainbow tr

It is concluded that predation alone cannot explain variation in population dynamics of either mayfly species; and the relative importance of predation is species- and environment-specific compared to non-predatory losses, such as other agents of mortality and non-consumptive effects of predators.

Abstract The contribution of indirect fitness to inclusive fitness is expected to increase as the reproductive skew increases, with indirect fitness being the only component of inclusive fitness of sterile individuals in eusocial species. However, the relative contribution of indirect fitness to inc

The effects of an accidentally introduced beetle Brachypterolus pulicarius on the growth and reproduction of its host, the invasive plant Linaria vulgaris, growing under field conditions across multiple years and sites in western Colorado, USA are studied.

Variation in vital demographic (e.g., survival) rates of males can influence population dynamics, but the male segment of the population is frequently ignored in ecological studies of mammals. Using a multistate capturemark-recapture model and 44 years of data from 17 habitat patches, we investigate

An examination of nonlinearities in vocalizations of other species suggests that non linearities may be an honest indicator of arousal, and this honesty elicits heightened responses in receivers.

AbstractThe mechanism underlying olfactory predator identification may be relatively experience‐independent, or it may rely on specific experience with predators. A mechanism by which prey might identify novel predators relies on the inevitable creation of sulfurous metabolites that are then excrete

The purpose of this study was to describe and determine the prevalence of decision-making characteristics of recreational backcountry groups when making a decision of where to travel and ride in avalanche terrain from the perspective of individuals. Decision-making characteristics encompassed commun

Age effects on maximum running speed (MRS) in yellow-bellied marmots (Marmota flaviventris) were examined to see whether this performance trait varied with age. Individuals were trapped in Tomahawk livetraps, then released and encouraged to run to burrows by yelling and chasing over varying distance

Several prey species have demonstrated a response to predator odors by altering their behavior, but few studies have explored the abilities of prey to discriminate between predator odors or to recognize novel predators. The olfactory abilities of yellow-bellied marmots (Marmota flaviventris) were st

Abstract Drosophila montana, a species of the Drosophila virilis group, has distributed around the northern hemisphere. Phylogeographic analyses of two North American and one Eurasian population of this species offer a good background for the studies on the extent of variation in phenotypic traits b

In studies of refuge use as a form of antipredator behavior, where prey hide in response to a predator's approach, factors such as foraging costs and the perceived risk in a predator's approach have been shown to influence the hiding behavior of prey. Because few studies of waiting games have focuse