The feeding ecology of predaceous stoneflies was investigated over 18 mo in Cement Creek, Colorado, USA. Three species were studied at each of three sites over their entire life cycles to elucidate any differences due to species and site. Diet typically changed, over the course of development, from

Equations are derived for the calculation of the rate of net energy intake of a foraging bumblebee and the assumptions that form the basis of these energy equations are discussed.

Experiments in Colorado and New York streams assessed the effects of predaceous stoneflies on benthic invertebrate community establishment in enclosures providing uncolonized habitat. Aspects of prey community structure measured were density, species richness, relative species abundance, and body si

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Abstract Measures of the seasonal timing of biological events are key to addressing questions about how phenology evolves, modifies species interactions, and mediates biological responses to climate change. Phenology is often characterized in terms of discrete events, such as a date of first floweri

Although predators affect prey both via consumption and by changing prey migration behavior, the interplay between these two effects is rarely incorporated into spatial models of predator–prey dynamics and competition among prey. We develop a model where generalist predators have consumptive effects

Research Article| June 01, 2008 Mantle convection and the recent evolution of the Colorado Plateau and the Rio Grande Rift valley Robert Moucha; Robert Moucha 1GEOTOP, Université du Québec à Montréal, Montréal, Québec H3C 3P8, Canada Search for other works by this author on: GSW Google Scholar Aless

The utility of considering multiple dimensions when measuring the structure and functional consequences of social behavior is highlighted, and the relationship between an individual’s social attributes and several performance measures is examined.

We hypothesize that somatic mutations may be the cause of variability among branches within individual trees, and that this variation is sufficient to deter herbivores. We discuss two single-locus genetic models of somatic mutation and consider how the organization of meristems affects somatic mutat

It is shown that B. flavifrons is using the resource distribution to direct its movements, and a large percentage of all movements are to nearest neighbors with maximal foraging efficiency gained through minimization of flight distances.

The first continuous recordings of natural hypothermia, and the only evidences of hypothermia during incubation, were obtained from temperature sensors embedded in synthetic hummingbird eggs placed in the nests. Resorting to this energy-conserving process was infrequent and could be correlated with

The yellow-bellied marmot ( Marmota flaviventris ) is a social, ground-dwelling squirrel that lives either individually or in kin groups of from two to five adult females. Philopatry and daughter recruitment lead to the formation and persistence of matrilines at habitat sites. By using 37 years of d

John Harte, Sarah McCarthy, Kevin Taylor, Ann Kinzig, Marc L. Fischer, Estimating Species-Area Relationships from Plot to Landscape Scale Using Species Spatial-Turnover Data, Oikos, Vol. 86, No. 1 (Jul., 1999), pp. 45-54

Using pairs of pollen donors, I analyzed the growth of pollen tubes growing in different channels of the same style in Erythronium grandiflorum. After 24 hr the length of pollen tubes of randomly selected pollen donors was affected by the presence of other donors. The mean pollen tube lengths of don

AbstractHost‐restricted lineages of gut bacteria often include many closely related strains, but this fine‐scale diversity is rarely investigated. The specialized gut symbiont Snodgrassella alvi has codiversified with honeybees (Apis mellifera) and bumblebees (Bombus) for millions of years. Snodgras

The study of plant secondary chemistry has been essential in understanding plant consumption by herbivores. There is growing evidence that secondary compounds also occur in floral rewards, including nectar and pollen. Many pollinators are generalist nectar and pollen foragers and thus are exposed to

Standard measurements of water vapor conductance in units of mg of H 2 O · day -1 · torr -1 (SI equivalent is mg of H 2 O · day -1 · pascal -1 ) of fresh eggs of the red-winged blackbird ( Agelaius phoeniceus ) and the native chicken of India ( Gallus gallus ) collected at altitude are significantly

By setting out arrays of potted plants of Penstemon strictus, I tested whether freely foraging bumblebee (Bombus spp.) workers would establish regular foraging routes that reflected the geometry of the array. They did, passing through an asymmetrical array in a pattern that minimized interplant flig

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