Michael Stemkovski,1,2* Climate change is shifting the environmental cues that determine the phenology of interacting spe- William D. Pearse,1,3 cies. Plant–pollinator systems may be susceptible to temporal mismatch if bees and flowering Sean R. Griffin,2,4 plants differ in their phenological response

Five populations of marmots were studied in Colorado from 1962 through 1972. Males are classified by age as yearlings, two‐year olds, and adults. Socially, marmots are colonial, peripheral, or transient. Each population was divided into four age‐sex classes, male yearlings, female yearlings, male ad

Focusing on the physiological and behavioral factors that enable a species to live in a harsh seasonal environment, this book places the social biology of marmots in an environmental context. It draws on the results of a forty-year empirical study of the population biology of the yellow-bellied marm

1. A knowledge of how individual behaviour affects populations in nature is needed to understand many ecologically important processes, such as the dispersal of larval insects in streams. The influence of chemical cues from drift‐feeding fish on the drift dispersal of mayflies has been documented in

We investigated the genetic background of intraspecific variation in wing color across an elevational gradient in the butterfly Colias philodice eriphyle. The degree of wing melanization was an accelerating function of elevation, and differences in wing melanization persisted in a common environment

A comparison of blood values of American goldfinches during summer and winter in Michigan reveals an increase in blood characteristics of winter individuals similar in extent to that of winter pine siskins, raising the possibility that the blood parameters of high altitude birds reflect adjustments

Yellow-bellied marmots Marmota ¯aviventris in the East River Valley of Colorado were live-trapped and individually marked annually from 1962 through 1993. These pooled data were used to produce a demography and life table for these years. Females had signi®cantly better survivorship than males beyon

Abstract Predicting the structure and dynamics of communities is difficult. Approaches linking functional traits to niche boundaries, species co‐occurrence and demography are promising, but have so far had limited success. We hypothesized that predictability in community ecology could be improved by

Ecosystem responses to climate change can exert positive or negative feedbacks on climate, mediated in part by slow- moving factors such as shifts in vegetation community composition. Long-term experimental manipulations can be used to examine such ecosystem responses, but they also present another

We examined patterns of genetic differentiation at isozyme loci in natural populations of Ipomopsis aggregata, for which distances of gene flow had been previously estimated. Using genetic neighborhood areas based on direct estimates of gene flow to define subpopulations, we found that FST values (t

AbstractTime series have played a critical role in documenting how phenology responds to climate change. However, regressing phenological responses against climatic predictors involves the risk of finding potentially spurious climate–phenology relationships simply because both variables also change

This chapter discusses the evolution, function, and meaning of marmot alarm communication, a system in which one can study the dynamics of altruism and the specific acoustic cues that marmots use, which enable them to respond to novel predators.

Most aspects of the bumblebees' rule of departure from an inflorescence of Aconitum columbianum are qualitatively what would be expected if the bumblebees maximize their net rate of energy gain. Flower revisitation increases with increases in the number of flowers already probed on an inflorescence

In nature, both similar and disparate sizes of Libellula lydia and L. luctuosa larvae frequently co—occur in time and space. To determine if these larvae interact as competitors, and/or predators and prey, I used artificial ponds to manipulate density, species composition, and size range of co—occur

The relationship between female reproductive success and both spring food and hibernacula resources was examined in a high—altitude population of yellow—bellied marmots (Marmota flaviventris). The number of offspring a female weaned was significantly associated with the estimated number she could po

Sympatric plant species can compete for pollination services in several ways. For example, pollinators may move between species and deposit heterospecific pollen on stigmas, which in turn may reduce the efficacy of conspecific pollen. We explored this possibility by determining the effect of Delphin

Directional and stabilizing selection tend to deplete additive genetic variance. On the other hand, genetic variance in traits related to fitness could be retained through polygenic mutation, spatially varying selection, genotype-environment interaction, or antagonistic pleiotropy. Most estimates of