High water temperature tolerance in photosynthetic activity of Zostera japonica Ascherson & Graebner seedlings from Ago Bay, Mie Prefecture, central Japan
High water temperature tolerance in photosynthetic activity of Zostera japonica Ascherson & Graebner seedlings from Ago Bay, Mie Prefecture, central Japan
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DOI：
10.1007/s12562-009-0141-x
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发表时间：
2009-09-01
影响因子：
1.9
通讯作者：
Maegawa, Miyuki
中科院分区：
文献类型：
--
作者：
Abe, Mahiko;Yokota, Keigo;Maegawa, Miyuki
用气体容积仪测定了结缕草幼苗在8种光照(0-800亩摩尔光子/m(2)/S)和10种水温(5-35A℃)条件下培养0天和6天的光合作用活性。取自米耶县阿古湾的苗木，在每个试验温度下精确控制的培养箱中培养1周。1周后，最大光合作用(P(Max))出现在29A℃，在30-35A℃培养的幼苗大部分漂白和枯萎。同时，在培养期间，光补偿点(I(C))仅在30A℃时增加。结果表明，日本对虾幼苗存活的最高临界水温为29A℃，这与日本沿海日本对虾的南界水温基本一致。有必要监测这一边界附近的这种物种，作为海水变暖的生物指示器。
Photosynthetic activity of Zostera japonica seedlings was measured using a gas volumeter at 0 and 6 days in culture under eight light (0-800 mu mol photons/m(2)/s) and ten water temperature conditions (5-35A degrees C). Seedlings from Ago Bay, Mie Prefecture were cultured in incubators accurately controlled at each test temperature for 1 week. After 1 week, maximum gross photosynthesis (P (maxg)) appeared at 29A degrees C and most seedlings cultured at 30-35A degrees C bleached and withered. At the same time, the light compensation point (I (c)) increased only at 30A degrees C during the culture period. As a result, the upper critical water temperature for survival was 29A degrees C in Z. japonica seedlings, which agrees well with that for the southern boundary of Z. japonica around Japanese coast. It is necessary to monitor this species around this boundary as a bio-indicator for seawater warming.