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Size-mediated priority effects are trait-dependent and consistent across latitudes in a damselfly
Oikos ( IF 3.4 ) Pub Date : 2021-06-24 , DOI: 10.1111/oik.08353
Mateusz Raczyński 1 , Robby Stoks 2 , Frank Johansson 3 , Szymon Sniegula 1
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Variation in hatching time (phenology) might cause size differences within populations resulting in size-mediated priority effects (SMPEs) shaping intraspecific interactions. These phenology-driven effects potentially can be strengthened by seasonal time constraints caused by a short growth season, and depend on latitude. Here the single and combined effects of phenology and latitude-associated time constraints on SMPEs in larvae of an aquatic insect, the damselfly Lestes sponsa, are studied. We did so by rearing larvae in groups of 16 individuals with different phenology (hatching date) thereby imposing strong intraspecific competition, resulting in cannibalism. We thereby manipulated in a fully crossed way time constraints (combination of temperature and photoperiod: thermo-photoperiod) in larvae from low-latitude and more time constrained high-latitude populations, and examined effects on life history (survival, development, growth) and physiology (fat and protein contents, and phenoloxidase activity as a measure of immune function). Phenology, time constraints and latitude of origin had strong effects on life history, but only the time constraint affected the physiology. We detected a SMPE for survival that, however, was not stronger under time constraints and was consistent in strength between latitudes. Phenology and time constraints interacted for development and growth in a direction suggesting adaptive responses to time constraints but these life history traits did not show SMPEs. We provided important insights in the study of SMPEs thereby showing these to be trait-dependent and not more pronounced under experimentally manipulated or latitude-associated time constraints. Our study thereby makes an important addition to geographic variation in SMPEs, a largely neglected topic.

中文翻译:

大小介导的优先效应依赖于性状,并且在豆娘中跨纬度一致

孵化时间(物候)的变化可能会导致种群内的体型差异,从而导致体型介导的优先效应 (SMPE) 形成种内相互作用。这些物候驱动的影响可能会因生长季节短引起的季节性时间限制而得到加强,并且取决于纬度。在这里,物候学和纬度相关的时间限制对水生昆虫幼虫 SMPE 的单一和综合影响,豆娘Lestes sponsa,被研究。我们通过在具有不同物候(孵化日期)的 16 只个体中饲养幼虫来做到这一点,从而强加了强烈的种内竞争,导致自相残杀。因此,我们以完全交叉的方式操纵来自低纬度和更多时间约束高纬度种群的幼虫的时间限制(温度和光周期的组合:热光周期),并检查对生活史(生存、发育、生长)和生理学(脂肪和蛋白质含量,以及酚氧化酶活性作为衡量免疫功能的指标)。物候、时间限制和起源纬度对生活史有很强的影响,但只有时间限制影响生理。我们检测到生存的 SMPE,然而,在时间限制下它并不强,而且纬度之间的强度是一致的。物候和时间限制在一个方向上相互作用促进发育和生长,表明对时间限制的适应性反应,但这些生活史特征没有显示 SMPE。我们在 SMPE 的研究中提供了重要的见解,从而表明这些是依赖于性状的,并且在实验操作或与纬度相关的时间限制下不会更明显。因此,我们的研究为 SMPE 的地理变化做出了重要补充,这是一个在很大程度上被忽视的话题。
更新日期:2021-09-01
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