Functional Responses Associated with Growth Form in Stream Algae
Functional Responses Associated with Growth Form in Stream Algae
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与溪流藻类生长形式相关的功能反应
DOI：
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发表时间：
1992
影响因子：
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通讯作者：
W. Hill
中科院分区：
文献类型：
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作者：
A. Steinman;P. Mulholland;W. Hill
在溪流藻类中测试了生长形式与磷吸收、碳固定和对放牧敏感性的关系。我们假设，具有高表面积：体积（SA：V）比的藻类物种将有更高的生物量比的营养吸收和光合作用比低SA：V比的物种。我们还预测，凝胶状或匍匐生长形式的藻类物种对放牧的敏感性较低。使用十个分类群进行生理测量，所述分类群包括在流动沃茨中常见的五种不同的藻类生长形式（无分支丝状;分支丝状;凝胶状，分支丝状;凝胶状，菌落;和匍匐）。SA：V与磷吸收、SA：V与碳固定在强光（200 μmol quanta m-2 s-1）下呈显著正相关，但仅在两个无关类群从分析中删除后才出现。在低光（20 μ molquantamm-2s-1）条件下，SA：V与固碳量之间存在显著的回归关系。草食动物对不同生长形式的偏好在短期实验中进行了评估，比较了蜗牛粪便中的藻类数量与基质上的藻类数量。最不优选到最优选的生长形式的排序是：凝胶状（菌落）=无分支丝状（鞘藻属）<匍匐<无分支丝状（脆杆藻属）。总体结果与浮游藻类的功能属性与其生长形态有关的假设是一致的。然而，除了生长形式之外，其他因素也会影响功能性能，并由此推断，在自然界中的分布。
The relationship of growth form to phosphorus uptake, carbon fixation, and susceptibility to grazing was tested in stream algae. We hypothesized that algal species with high surface area: volume (SA:V) ratios would have higher biomass-specific rates of nutrient uptake and photosynthesis than species with low SA:V ratios. We also predicted that algal species with gelatinous or prostrate growth forms would have low susceptibility to grazing. Physiological measurements were made using ten taxa comprising five different algal growth forms commonly found in flowing waters (unbranched filamentous; branched filamentous; gelatinous, branched filamentous; gelatinous, colonial; and prostrate). Significant positive relationships were obtained between SA:V and phosphorus uptake, and SA:V and carbon fixation at high light (200 μmol quanta m-2 s-1), but only after two outlying taxa were deleted from the analysis. A significant regression was obtained between SA:V and carbon fixation at low light (20 μmol quanta m-2 s-1) when all ten taxa were included. Herbivore preference for different growth forms was assessed in a short-term experiment which compared the amount of algae in snail feces vs. that on substrates. The ranking for least preferred to most preferred growth form was: gelatinous (colonial) = unbranched filamentous (Oedogonium) < prostrate < unbranched filamentous (Fragilaria). The overall results are consistent with the hypothesis that the functional attributes of lotic algae are related to their growth form. However, other factors beside growth form also can influence the functional performance and, by inference, the distribution of lotic algae in nature.