Impacts of Variation in Food Availability on Spatial Habitat Use in Breeding and Non-Breeding Red Crossbills (\u3c/i\u3eLoxia curvirostra\u3c/i\u3e)

Movement patterns, habitat use, and reproductive behavior are among many attributes impacted by the distribution of resources within habitats. Our study used radio telemetry to investigate the relationship between food availability and movement patterns of breeding and non-breeding red crossbills (Loxia curvirostra). Crossbills were captured and tracked in different seasons and under conifer seed mast and nonmast conditions. Telemetry data were used to generate statistical models to analyze spatial habitat use. Total linear distance traveled per total area of the home range was used as a comparative measure of activity within home ranges across specimens. We found a significant increase in within- home range activity during mast years. Birds rearing young exhibited greater within-home range activity than non-breeding birds. Total distance traveled was significantly greater in summer than in winter. Our results suggest greater activity under high food conditions

Impacts of Variation in Food Availability on Spatial Habitat Use in Breeding and Non-Breeding Red Crossbills (\u3c/i\u3eLoxia curvirostra\u3c/i\u3e)

Movement patterns, habitat use, and reproductive behavior are among many attributes impacted by the distribution of resources within habitats. Our study used radio telemetry to investigate the relationship between food availability and movement patterns of breeding and non-breeding red crossbills (Loxia curvirostra). Crossbills were captured and tracked in different seasons and under conifer seed mast and nonmast conditions. Telemetry data were used to generate statistical models to analyze spatial habitat use. Total linear distance traveled per total area of the home range was used as a comparative measure of activity within home ranges across specimens. We found a significant increase in within- home range activity during mast years. Birds rearing young exhibited greater within-home range activity than non-breeding birds. Total distance traveled was significantly greater in summer than in winter. Our results suggest greater activity under high food conditions

Long-Term (9-Year) Response of Two Semiarid Grasslands to Prescribed Fire in the Southwestern USA

Historically, arid grasslands of SW USA experienced fire return intervals of 5-10 years. During the last 100 years, however, fire has been a rare event. Recent expansion of woody plants in arid grasslands has prompted managers to re-introduce fire as a tool to reduce abundance of woody plants and maintain perennial grass cover. The use of fire in desert grasslands poses unique challenges, however, due to extreme variability in rainfall patterns. Our research examines vegetation response to repeat fire in 2 desert grassland ecotones near Albuquerque, New Mexico (35.05o N 106.60o W)

Time Dependent Clustering Analysis of the Second BATSE Gamma-Ray Burst Catalog

A time dependent two-point correlation-function analysis of the BATSE 2B catalog finds no evidence of burst repetition. As part of this analysis, we discuss the effects of sky exposure on the observability of burst repetition and present the equation describing the signature of burst repetition in the data. For a model of all burst repetition from a source occurring in less than five days we derive upper limits on the number of bursts in the catalog from repeaters and model-dependent upper limits on the fraction of burst sources that produce multiple outbursts.Comment: To appear in the Astrophysical Journal Letters, uuencoded compressed PostScript, 11 pages with 4 embedded figure

Engaging Hashima: Memory Work, Site-Based Affects, and the Possibilities of Interruption

How is memory embodied, narrated, interrupted, and reworked? Here, we take a postphenomenological approach to memory work that is attentive to how site-based affects prompt and ossify, but also transmogrify, memory of place. With reference to an intensely traumatized, but also domesticated and entropied, environment—the island of Hashima, off the coast from Nagasaki City in Japan—we demonstrate the relevance and explanatory reach of culturally specific accounts of memory, time, and place; how an attentiveness to cultural context in the making of meaning helps mark out the epistemological violences that accrue around sites such as Hashima as objects of analysis in and of themselves; and the affective capacities of the materialities and forces that compose such sites, which can present a welter of surfaces and interiorities that are sensuously “felt” as memory