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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Duration of temperature exposure controls growth of Zostera japonica: Implications for zonation and colonization
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Duration of temperature exposure controls growth of Zostera japonica: Implications for zonation and colonization

机译：暴露在温度下的持续时间控制了日本带菌的生长：对带状和定殖的影响

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At least two seagrass congeners in the genus Zostera are found along the Pacific Coast of North America: native Zostera marina L. and the non-native Zosterajaponica Aschers. & Graebn. Efforts to understand the drivers behind the expanding colonization of Zjaponica have led to interest in the biology and ecology of this species. In most locations where they co-occur, these species exhibit a disjunct vertical zonation. We experimentally consider the influence of pulsed temperature effects on Zjaponica growth as a driver of vertical zonation. In mesocosm tanks seagrass planting units were cycled from ambient to treatment temperatures (8,20,32 ℃) of variable duration (2, 6,12,24 h) each day for 10 d and then growth was assessed. Leaf elongation and growth rates exhibited strong, statistically significant relationships with increasing duration of exposure to 20 ℃. Plants exposed to continuous 20 ℃ temperatures grew 25 times faster than plants exposed to 20 ℃ for 2 h. Likewise, plants exposed to continuous 8 ℃ temperatures grew 25 times slower than plants at 8 ℃ for 2 h. Plants exposed to 32 ℃ maintained fairly constant growth and elongation rates regardless of the duration of exposure. Field data indicate that Z. japonica and Z. marina experience different thermal regimes in the same estuary. We suggest that intertidal zonation patterns of Z. japonica in North America are predominantly driven by seagrass temperature responses; increased duration of exposure to cold water temperatures appears to limit expansion of the Z. japonica bed lower boundary to the mid-intertidal. Additionally, we recognize characteristics that may be useful to identifying systems susceptible to colonization.
机译：在北美太平洋沿岸发现至少两个Zostera属海草同源物：本地Zostera滨海L.和非本地Zosterajaponica Aschers。 ＆Graebn。努力了解Zjaponica不断扩大的殖民化背后的驱动力，引起了人们对该物种的生物学和生态学的兴趣。在大多数同时发生的地方，这些物种表现出不同的垂直分区。我们实验性地考虑了脉冲温度效应对Zjaponica生长的影响，将其作为垂直分区的驱动力。在中观容器中，每天将海草种植单元从环境温度切换到处理温度（8、20、32℃），并进行可变持续时间（2、6、12、24 h），持续10 d，然后评估其生长。叶片伸长率和生长速率与暴露于20℃的持续时间呈显着的统计学相关性。暴露于20℃连续温度下的植物比暴露于20℃2小时的植物生长快25倍。同样，暴露于8℃连续温度下的植物生长2小时的速度比8℃下的植物慢25倍。无论暴露时间长短，暴露于32℃的植物均保持相当恒定的生长和伸长率。野外数据表明，在相同的河口中，Z。japonica和Z. marina经历了不同的热态。我们认为，北美Z. japonica的潮间带分区模式主要是由海草温度响应驱动的。暴露于冷水温度下持续时间的增加似乎限制了Z. japonica床下部边界向潮间中期的扩展。此外，我们认识到可能有助于识别易于定植的系统的特征。

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