• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Seasonal acclimation in metabolism reduces light requirements of eelgrass (Zostera marina)
【24h】

Seasonal acclimation in metabolism reduces light requirements of eelgrass (Zostera marina)

机译：新陈代谢的季节性适应减少了鳗el（Zostera marina）的光照需求

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We investigated the ability of eelgrass (Zostera marina) to adjust light requirements to seasonal changes in temperature, light and nutrient conditions through changes in metabolism, pigment and nutrient content In agreement with expectations we found that rates of respiration and light saturated photosynthesis of summer acclimated plants peaked at higher temperatures (5 ℃ and 2 ℃ higher, respectively), and were lower than of winter acclimated plants, both at sub- and supra-optimal temperatures. Moreover respiration rates were generally more sensitive to increasing temperatures than photosynthetic rates, especially so for cold acclimated plants in February (36% higher Q_(10)-values). These changes were accompanied by a reduction in chlorophyll a and nitrogen concentrations in leaves by 35% and 60% respectively from February to August The critical light requirement (E_C) of Z. marina to maintain a positive carbon balance increased exponentially with increasing temperature but less so for summer-acclimated than for winter-acclimated plants. However, combining E_C vs temperature models for whole-plants with data on daily light availability showed that seasonal acclimation in metabolism increased the annual period, when light requirements were meet at the 2-5 m depth interval, by 32-66 days. Hence, acclimation is an important mechanism allowing eelgrass to grow faster and penetrate to deeper waters. Critical depth limits estimated for different combinations of summer temperatures and water clarity in a future climate scenario, suggested that expected increases in temperature and nutrient run-off have synergistic negative effects, especially in clear waters, stressing the importance of continued efforts to improve water clarity of coastal waters.
机译：我们研究了鳗草（Zostera marina）通过代谢，色素和营养素含量变化来适应温度，光照和养分状况季节性变化的光照需求的能力。与预期相符，我们发现夏季的呼吸速率和光饱和光合作用得以适应在最高和最高温度下，植物在较高温度（分别高5℃和2℃）达到峰值，并且比冬季适应的植物低。此外，呼吸速率通常比光合作用速率对温度升高更为敏感，尤其是对于2月的冷驯化植物（Q_（10）值高36％）而言。这些变化伴随着从2月到8月叶片中叶绿素a和氮浓度分别降低35％和60％。滨海链球菌维持正碳平衡的临界光需求（E_C）随着温度的升高呈指数增加，但降低因此，夏季适应的植物要多于冬季适应的植物。但是，将整株植物的E_C对温度模型与每日可用光量的数据结合起来显示，当在2-5 m深度间隔处满足光需求时，新陈代谢的季节性适应增加了32-66天的年限。因此，驯化是使鳗草生长更快并渗透到更深水域的重要机制。在未来的气候情景中，估计了夏季温度和水的清澈度的不同组合的临界深度极限，这表明温度和养分径流的预期增加具有协同的负面影响，尤其是在清澈的水域中，强调了继续努力以改善水的清澈度的重要性沿海水域。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号