A high resolution study of the platelet ice ecosystem in McMurdo Sound, Antarctica photosynthetic and bio-optical characteristics of a dense microalgal bloom
A high resolution study of the platelet ice ecosystem in McMurdo Sound, Antarctica photosynthetic and bio-optical characteristics of a dense microalgal bloom
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南极洲麦克默多湾血小板冰生态系统的高分辨率研究密集微藻华的光合和生物光学特征
DOI：
10.3354/meps098173
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发表时间：
1993
影响因子：
2.5
通讯作者：
C. Sullivan
中科院分区：
文献类型：
--
作者：
K. Arrigo;D. H. Robinson;C. Sullivan
在麦克默多海峡的低层冰和板状冰层中，结合光合有效辐射和光谱辐射的垂直衰减，监测了微藻的吸收、生物量和光合生理。1989年的南极洲藻类生物量的89%至99%位于0.68 m厚的片状层内，其中以叶绿素a（CMa）测量。在10月26日至12月3日期间从280增加到1090 mg m-2。藻类生物量是高度分层内的血小板冰层。一个越来越大的分数。38%~ 90%的叶绿素a是从血小板层上部0.125 m处收集的，靠近血小板底部。藻类色素占该层内总光衰减（冰+颗粒）的> 95%。海冰微藻表现出与极端遮荫适应相一致的光合特性，包括较低的平均色素特异性吸收（ii '，0.0074 ~ 0.0040 m2（mgchla）'）和较低的同化数（i0.032 ~ 0.180 mgC（mgchla）' h-'），两者均随深度而下降。垂直分布揭示了片状冰集合体的低量子产额不是低温的函数。如先前所怀疑的，但随深度变化（因此光级）从0.033-0.051 m01 C（吸收）-（一个吸收）--”（接近理论最大值）在0.31m深度，冰板表面的微藻具有光合作用特征，表明它们对环境光场有很好的适应性，而深层的微藻则具有光合作用特征，似乎保留了过剩的光合能力。海冰微藻表现出的低δ ′和补偿强度允许积累超过理论最大值0.4 g m-1的活性叶绿素a（建议用于质子和原子），这得到海冰下可用irrahance的支持。精细尺度的光合参数的垂直配置文件意味着来自密集，分层微藻种群的过程中采样的值不可靠地反映率在原位。
Microalgal absorption, biomass, and photophysiology were monitored in conjunction w t h the vertical attenuation of photosynthetically active radiation and spectral ~rradiance within the lower congelation ice and the platelet ice layer in McMurdo Sound. Antarctica in 1989. Between 89 and 99 % of the algal biomass was located within the 0.68 m thick platelet layer where standing crop, measured as chlorophyll a (CM a). increased from 280 to 1090 mg m-2 between October 26 and December 3. Algal biomass was highly stratified within the platelet ice layer. An increasing fraction. 38 to 90 %, of integrated chl a was collected from the upper 0.125 m of the platelet layer, near the base of the congelation ice. Algal pigments accounted for >95 % of total light attenuation (ice + particles) within this layer. Sea ice microalgae exhibited photosynthetic properties consistent with extreme shade adaptation, including low mean pigment-specific absorption, ii', [0.0074 to 0.0040 m2 (mg chl a ) ' ] and low assimilation numbers i0.032 to 0.180 mg C (mg chl a ) ' h-'], both of which declined with depth. Vertical prof~les revealed that low quantum yields for platelet ice assemblages were not a function of low temperature. as had previously been suspected, but vary with depth (and hence light level) from 0.033-0.051 m01 C (Ein absorbed)-' just beneath the base of the congelation ice to 0.086-0.113 m01 C (Ein absorbed)-' (approaching the theoretical maximum) at a depth of 0.31 m Microalgae at the platelet ice surface exhibited photosynthetic charactenstics which suggested that they were well adapted to the ambient light field while algae at depth appeared to retain excess photosynthetic capacity. The low 8' and compensation intensity exhibited by sea ice microalgae allowed accumulation of viable chl a in excess of the theoretical maximum of 0.4 g m-' (proposed for planktonic &atoms) to be supported by the available irrahance beneath sea ice. Fine-scale vertical profiles of photosynthetic parameters implied that values derived from course sampling of dense, stratified microalgal populations do not reliably reflect rates in situ.
南极洲洛措-霍尔姆湾海冰变化与生物过程的关系
DOI：
--
发表时间：
2006
期刊：
Proceedings of International Symposium on Long-term Variations in the Coastal Environments and Ecosystems
影响因子：
--
作者：
Odate;T
通讯作者：
T