3 Works

Data from: Geographical barriers and climate influence demographic history in narrowleaf cottonwoods

Luke M. Evans, Gerard J. Allan, Stephen P. DiFazio, Gancho T. Slavov, Jason A. Wilder, Kevin D. Floate, Stewart B. Rood & Thomas G. Whitham
Studies of genetic variation can clarify the role of geography and spatio-temporal variation of climate in shaping demography, particularly in temperate zone tree species with large latitudinal ranges. Here, we examined genetic variation in narrowleaf cottonwood, Populus angustifolia, a dominant riparian tree. Using multi-locus surveys of polymorphism in 363 individuals across the species’ 1800 km latitudinal range, we found that, first, P. angustifolia has stronger neutral genetic structure than many forest trees (simple sequence repeat...

Data from: Influence of ecological and geological features on rangewide patterns of genetic structure in a widespread passerine.

Rachael V. Adams & Theresa M. Burg
Geological and ecological features restrict dispersal and gene flow, leading to isolated populations. Dispersal barriers can be obvious physical structures in the landscape; however microgeographic differences can also lead to genetic isolation. Our study examined dispersal barriers at both macro- and micro-geographical scales in the black-capped chickadee, a resident North American songbird. Although birds have high dispersal potential, evidence suggests dispersal is restricted by barriers. The chickadee’s range encompasses a number of physiological features which...

Data from: Senescence in duckweed: age-related declines in survival, reproduction, and offspring quality

Patrick M. Barks & Robert A. Laird
1. As they grow old, most organisms experience progressive physiological deterioration resulting in declining rates of survival and reproduction – a seemingly maladaptive phenomenon known as senescence. 2. Although senescence is usually defined with respect only to survival and reproduction, a third component of fitness, offspring quality, may also decline with age. Few studies, however, have assessed age-related changes in offspring quality using measures that truly reflect fitness. 3. In a controlled environment, we tested...

Registration Year

  • 2014
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  • Dataset
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Affiliations

  • University of Lethbridge
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  • West Virginia University
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  • University of Arizona
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  • Institute of Biological, Environmental and Rural Sciences
    1