• Energy Research
• Open Access close
• Open Source close
• English close
• University of Michigan–Flint close

Mode of access: Internet.

Cover title. ; Mode of access: Internet.

Variation in evolutionary rates among species is a defining characteristic of the tree of life and may be an important predictor of species’ capacities to adapt to rapid environmental change. It is broadly assumed that generation length is an important determinant of microevolutionary rates, and body size is often used as a proxy for generation length. However, body size has myriad biological correlates that could affect evolutionary rates independently from generation length. We leverage two large, independently collected datasets on recent morphological change in birds (52 migratory species breeding in North America and 77 South American resident species) to test how body size and generation length are related to rates of contemporary morphological change. Both datasets show that birds have declined in body size and increased in wing length over the past 40 years. We found, in both systems, a consistent pattern wherein smaller species declined proportionally faster in body size and increased proportionally faster in wing length. By contrast, generation length explained less variation in evolutionary rates than did body size. Although the mechanisms warrant further investigation, our study demonstrates that body size is an important predictor of contemporary variation in morphological rates of change. Given the correlations between body size and a breadth of morphological, physiological, and ecological traits predicted to mediate phenotypic responses to environmental change, the relationship between body size and rates of phenotypic change should be considered when testing hypotheses about variation in adaptive responses to climate change. For information on data collection see https://doi.org/10.5061/dryad.8pk0p2nhw and https://doi.org/10.5061/dryad.fqz612jsp.

At head of title: Federal Energy Administration Project Independence blueprint final task force report. ; Cover title. ; Mode of access: Internet.

Mode of access: Internet.

"February 26, 1991"--Pts. 2 and 3. ; "February 21, 1991"--Pt. 1. ; Shipping list no.: 91-300-P (pt. 1); 91-290-P (pt. 2); 91-295-P (pt. 3). ; Distributed to some depository libraries in microfiche. ; Pt. 3 subtitle: Subtitle C of Title IV and Section 10003 of Title X. ; Pt. 2 subtitle: Title III and Subtitles A and B of Title IV. ; Includes bibliographical references. ; Mode of access: Internet.

"Prepared for the Conference Board's 'Atomic energy course for management.'" ; Cover title. ; Bibliography: p.67-70. ; Mode of access: Internet.

Includes bibliographical references (p. 31-32). ; Mode of access: Internet.

Mode of access: Internet.

Mode of access: Internet.