3 Works

Data from: Among-strain consistency in the pace and shape of senescence in duckweed

Patrick M. Barks, Zach W. Dempsey, Theresa M. Burg & Robert A. Laird
1.Comparative studies have demonstrated extensive variation in age-trajectories of mortality and fecundity, both within and among species, with many taxa exhibiting a general pattern of age-related demographic decline referred to as senescence. Whereas a considerable body of theory is devoted to explaining the origin and persistence of senescence, the evolutionary forces underlying variation in demographic trajectories more generally remain poorly understood. 2.Studying variation in demographic trajectories is complicated by the fact that different species (or...

Data from: Demographic senescence in the aquatic plant Lemna gibba L. (Araceae)

Suzanne L. Chmilar & Robert A. Laird
Senescence is progressive, age-related bodily deterioration, accompanied at the population level by declines in average survival and fecundity (i.e., ‘demographic senescence’). Demographic senescence of plants has been investigated in only a few species, including small, floating macrophytes in the genus Lemna (family Araceae, subfamily Lemnoideae – the ‘duckweeds’). Unlike most plant species, Lemna ramets exhibit determinate growth, potentially rendering them more likely to experience demographic senescence. Here, our objective was to investigate senescence in a...

Data from: Population genetics and speciation of yellow-bellied, red-naped, and red-breasted sapsuckers (Sphyrapicus varius, S. nuchalis, and S. ruber)

Libby Natola & Theresa M. Burg
The root of understanding speciation lies in determining the forces which drive it. In many closely-related species, including Sphyrapicus varius, S. nuchalis, and S. ruber, it is assumed that speciation occurred due to isolation in multiple Pleistocene refugia. We used genetic data from 457 samples at the control region, COI, and CHD1Z to examine rangewide population genetic structure and differentiation amongst these three species across each species’ breeding range. In addition, we modelled these species’...

Registration Year

  • 2018

Resource Types

  • Dataset


  • University of Lethbridge