Plankton community respiration: relationships with size distribution and lake trophy
Plankton community respiration: relationships with size distribution and lake trophy
复制标题
浮游生物群落呼吸：与大小分布和湖泊奖杯的关系
作者：
M. Ahrens;R. Peters
对群落大小结构的异速生长解释通常假设生理速率和体型之间的实验室关系适用于该领域，但这种假设很少受到严格检验。因此，我们测试了浮游生物群落呼吸速率是平均体型的可预测函数的假设，并将这些函数与实验室关系进行了比较。在广泛的营养条件范围内（6.5 ≤ [TP] ≤ 130 μg I−1；1.2≤ [chl-a] ≤ 29 μg 1−1 ），超微型浮游生物、超微浮游生物和净浮游生物组合的每个生物体的平均呼吸速率是平均生物体大小的幂函数，指数为 0.73。当呼吸 (R) 和生物体积 (B) 标准化为当量碳单位时，R/B 比率是平均生物体大小的幂函数，指数为 -0.30。这些结果为尺寸分布可用于构建群落生理学综合模型的论点提供了实证支持。总表湖磷浓度与浮游生物群落的生物体积和呼吸速率以及三个浮游生物大小类别的呼吸速率相关；因此这些方面的群落功能也可能是湖泊营养状态的可预测功能。
Allometric interpretations of community size structure often assume that laboratory relations between physiological rates and body size apply in the field, but this assumption is rarely examined critically. We therefore tested the hypothesis that limnoplankton community respiration rates are predictable functions of mean body size, and compared these functions to laboratory relations. Over a broad range of trophic conditions (6.5 ≤ [TP] ≤ 130 μg I−1; 1.2≤ [chl-a] ≤ 29 μg 1−1 ), the mean respiration rate per organism for picoplankton, nannoplankton, and net plankton assemblages was a power function of mean organism size, with an exponent of 0.73. When respiration (R) and biovolume (B) are standardized to equivalent carbon units, the R/B ratio was a power function of mean organism size, with an exponent of −0.30. These results provide empirical support for the contention that size distributions may be used to construct comprehensive models of community physiology. The total epilimnetic phosphorus concentration was correlated with both the biovolume and respiration rate of the plankton community, as well as with the respiration rates of the three plankton size classes; so these aspects of community function may also be predictable functions of lake trophic state.