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.

Pollen movement within and among plants affects levels of inbreeding and plant fitness as well as the spatial scale of genetic differentiation. Pollen movement has primarily been studied as a function of the direct relationships between plants and pollinators; however, nonpollinating floral visitors

Teleseismic traveltime data are inverted for mantle Vp and Vs variations beneath a 1400 km long line of broadband seismometers extending from eastern New Mexico to western Utah. The model spans 600 km beneath the moho with resolution of ∼50 km. Inversions show a sharp, large‐magnitude velocity contr

Population dynamics and social behavior of 5 populations were studied for 10 yr. Agonistic behavior characterized social interactions among adult females and yearlings who were subordinate. Rates of amicable and of agonistic behavior varied widely within a harem from year to year and among harems in

AbstractPlant species can influence the pollination and reproductive success of coflowering neighbors that share pollinators. Because some individual pollinators habitually forage in particular areas, it is also possible that plant species could influence the pollination of neighbors that bloom late

Soil microbial biomass can reach its annual maximum pool size beneath the winter snowpack and is known to decline abruptly following snowmelt in seasonally snow-covered ecosystems. Observed differences in winter versus summer microbial taxonomic composition also suggests that phylogenetically conser

Accepted Article Point 1: In recent years the availability of airborne imaging spectroscopy (hyperspectral) data has expanded dramatically. The high spatial and spectral resolution of these data uniquely enable spatially explicit ecological studies including species mapping, assessment of drought mo

It is often assumed that genetic diversity contributes to reduced disease incidence in natural plant populations. However, little is known about the genetic structure of natural populations affected by disease. Here I present data from three apomictic (asexual) populations of Arabis holboellii infec

Stainless steel screen cages were buried in the substrate of Otter Creek, Wisconsin, during spring 1976 and 1977 and the East River, Colorado, during summer 1977 and stocked with known densities of benthos, Cages were retrieved after 3 days of colonization and attrition from a given direction and sp

Although kin selection has been suggested as the mechanism underlying the formation of mammalian societies, many species act as if they attempt to maximize the direct fitness component of their inclusive fitness.

We compared patterns of growth in juvenile yellow-bellied marmots (Marmota flaviventris) between 2 years in which precipitation differed, and we determined if mass at entry into hibernation affects over-winter survival. Juveniles exhibited an asymptotic growth pattern with mass gain for a mean of 60

The balance of heat gain from sunlight versus heat loss from convection and radiation does not appear to change by more than a few percent between the wings-closed basking posture and the variable opening of wings in flight, although several aspects require further study.

Climate change is causing many plants to flower earlier in spring, exposing them to novel selection pressures, including—potentially—pollinator shortages. Over 2 years that contrasted in timing of flowering onset, we studied reproductive strategies, pollen limitation, and selection on flowering time

Journal Article Nonrandom Orientation of Entrance Holes to Woodpecker Nests in Aspen Trees Get access D. W. Inouye D. W. Inouye Department of Zoology, University of North Carolina, Chapel Hill, North Carolina 27614 Search for other works by this author on: Oxford Academic Google Scholar The Condor,

AbstractThe selective use of seasonal precipitation by vegetation is critical to understanding the residence time and flow path of water in watersheds, yet there are limited datasets to test how climate alters these dynamics. Here, we use measurements of the seasonal cycle of tree ring O for two wid

The interactions between ants and certain sap-feeding insects in the order Hemiptera are classic examples of food-for-protection mutualisms. In these associations, herbivorous hemipterans use a highly specialized, straw-like mouthpart to consume sap directly from plant phloem and xylem and, as a res

Abstract Continuous exposure to humans causes wildlife to either habituate or sensitize. Although increased tolerance may play an important role in coexistence with humans, the mechanisms and fitness outcomes of long-term changes of tolerance are not fully understood because only a few studies have

Journal Article Nesting Behavior of the American Dipper in Colorado Get access Harry W. Hann Harry W. Hann Department of Zoology and Rackham School of Graduate Studies, University of Michigan, Ann Arbor, Michigan Search for other works by this author on: Oxford Academic Google Scholar The Condor, Vo