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

被引:15
作者
Barks, Patrick M. [1 ,2 ]
Dempsey, Zach W. [1 ]
Burg, Theresa M. [1 ]
Laird, Robert A. [1 ]
机构
[1] Univ Lethbridge, Dept Biol Sci, Lethbridge, AB, Canada
[2] Univ Southern Denmark, Dept Biol, DK-5230 Odense M, Denmark
基金
加拿大自然科学与工程研究理事会;
关键词
ageing; biodemography; lemnoideae; life-history tradeoff; pace-shape; senescence; LIFE-HISTORY VARIATION; FAST-SLOW CONTINUUM; EXTRINSIC MORTALITY; RANGE EXPANSION; LEMNA-MINOR; TRADE-OFFS; EVOLUTION; AGE; INHERITANCE; STRATEGIES;
D O I
10.1111/1365-2745.12937
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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 even different populations of a given species) may live and reproduce on different time-scales, which, for comparative purposes, can make it challenging to disentangle patterns of age-related demographic change (the shape of demographic age trajectories) from the time-scale on which those changes happen (the pace of demographic age trajectories). 3. Here, we examine variation in the pace and shape of demographic trajectories among strains of the aquatic plant Lemna turionifera Landolt from 24 sites across Alberta, Canada. Our main objectives were to describe the shape of demographic trajectories in L. turionifera, and test for among-strain variation in pace and shape. We also tested whether potential variation in pace and shape is (1) constrained by trade-offs with other life-history traits, and (2) consistent with local adaptation to environmental characteristics at the sites of strain origin. 4. The strains we examined were overwhelmingly subject to age-related increases in mortality and declines in fecundity, with increases in mortality tending to decelerate and plateau at advanced ages. Despite substantial among-strain variation in cumulative fecundity and plant size, measures of pace and shape did not in themselves vary significantly among strains. Both within and among strains, we observed a negative relationship between plant size and the shape of fecundity trajectories, but we found no other evidence for life-history trade-offs involving pace or shape, nor for local adaptation. 5. Synthesis. Angiosperms display remarkable demographic variation. Our results suggest that the pace and shape of demographic trajectories are highly conserved within one particular angiosperm species (Lemna turionifera), despite substantial among-strain variation in other life-history traits.
引用
收藏
页码:2132 / 2145
页数:14
相关论文
共 93 条
[1]  
ABRAMS PA, 1993, EVOLUTION, V47, P877, DOI 10.1111/j.1558-5646.1993.tb01241.x
[2]  
Aguilaniu H, 2003, YEAST, V20, pS303
[3]   Aging in a Long-Lived Clonal Tree [J].
Ally, Dilara ;
Ritland, Kermit ;
Otto, Sarah P. .
PLOS BIOLOGY, 2010, 8 (08) :19-20
[4]  
[Anonymous], 2017, EVOLUTION SENESCENCE
[5]  
[Anonymous], 2017, R LANG ENV STAT COMP
[6]  
[Anonymous], 1983, Journal of the Japanese Statistical Society
[7]  
[Anonymous], 1949, Factors of evolution: the theory of stabilizing selection
[8]   SEXUAL SELECTION AFFECTS THE EVOLUTION OF LIFESPAN AND AGEING IN THE DECORATED CRICKET GRYLLODES SIGILLATUS [J].
Archer, C. R. ;
Zajitschek, F. ;
Sakaluk, S. K. ;
Royle, N. J. ;
Hunt, J. .
EVOLUTION, 2012, 66 (10) :3088-3100
[9]   STUDIES IN THE MORPHOGENESIS OF LEAVES .3. PRELIMINARY OBSERVATIONS ON VEGETATIVE GROWTH IN LEMNA-MINOR [J].
ASHBY, E ;
WANGERMANN, E ;
WINTER, EJ .
NEW PHYTOLOGIST, 1949, 48 (03) :374-381
[10]   A multigenerational effect of parental age on offspring size but not fitness in common duckweed (Lemna minor) [J].
Barks, P. M. ;
Laird, R. A. .
JOURNAL OF EVOLUTIONARY BIOLOGY, 2016, 29 (04) :748-756