globalchange  > 气候变化事实与影响
DOI: 10.1098/rstb.2018.0177
WOS记录号: WOS:000460485900003
论文题名:
Trait variation in extreme thermal environments under constant and fluctuating temperatures
作者: Salinas, Santiago1; Irvine, Shannon E.1; Schertzing, Claire L.1; Golden, Shelby Q.1; Munch, Stephan B.2,3
通讯作者: Salinas, Santiago
刊名: PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES
ISSN: 0962-8436
EISSN: 1471-2970
出版年: 2019
卷: 374, 期:1768
语种: 英语
英文关键词: cryptic ; hidden ; temperature ; fathead minnow
WOS关键词: CRYPTIC GENETIC-VARIATION ; LIFE-HISTORY TRAITS ; HEAT-SHOCK PROTEINS ; CLIMATE-CHANGE ; PHENOTYPIC PLASTICITY ; STRESSFUL ENVIRONMENTS ; REACTION NORMS ; EVOLUTION ; ADAPTATION ; ACCLIMATION
WOS学科分类: Biology
WOS研究方向: Life Sciences & Biomedicine - Other Topics
英文摘要:

Climate change is increasingly exposing populations to rare and novel environmental conditions. Theory suggests that extreme conditions will expose cryptic phenotypes, with a concomitant increase in trait variation. Although some empirical support for this exists, it is also well established that physiological mechanisms (e.g. heat shock protein expression) change when organisms are exposed to constant versus fluctuating temperatures. To determine the effect of common, rare and novel temperatures on the release of hidden variation, we exposed fathead minnows, Pimephales promelas, to five fluctuating and four constant temperature regimes (constant treatments: 23.5, 25, 28.5 and 31 degrees C; all fluctuating treatments shared a minimum temperature of 22 degrees C at 00.00 and a maximum of 25, 28, 31, 34 or 37 degrees C at 12.00). We measured each individual's length weekly over 60 days, critical thermal maximum (CTmax), five morphometric traits (eye anterior-posterior distance, pelvic fin length, pectoral fin length, pelvic fin ray count and pectoral fin ray count) and fluctuating asymmetry (FA, absolute difference between left and right morphometric measurements; FA is typically associated with stress). Length-at-age in both constant and fluctuating conditions decreased with temperature, and this trait's variance decreased with temperature under fluctuating conditions but increased and then decreased in constant temperatures. CTmax in both treatments increased with increasing water temperature, while its variance decreased in warmer waters. No consistent pattern in mean or variance was found across morphometric traits or FA. Our results suggest that, for fathead minnows, variance can decrease in important traits (e.g. length-at-age and CTmax) as the environment becomes more stressful, so it may be difficult to establish comprehensive rules for the effects of rarer or stressful environments on trait variation.


This article is part of the theme issue 'The role of plasticity in phenotypic adaptation to rapid environmental change'.


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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/132166
Appears in Collections:气候变化事实与影响

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作者单位: 1.Kalamazoo Coll, Dept Biol, 1200 Acad St, Kalamazoo, MI 49006 USA
2.NOAA, Natl Marine Fisheries Serv, 110 Shaffer Rd, Santa Cruz, CA 95060 USA
3.Univ Calif Santa Cruz, Ctr Stock Assessment Res, Santa Cruz, CA 95064 USA

Recommended Citation:
Salinas, Santiago,Irvine, Shannon E.,Schertzing, Claire L.,et al. Trait variation in extreme thermal environments under constant and fluctuating temperatures[J]. PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY B-BIOLOGICAL SCIENCES,2019-01-01,374(1768)
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