Dynamic relationships between body size, species richness, abundance, and energy use in a shallow marine epibenthic faunal community
Dynamic relationships between body size, species richness, abundance, and energy use in a shallow marine epibenthic faunal community
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浅海表底栖动物群落体型大小、物种丰富度、丰度和能量利用之间的动态关系
作者：
Fabio A. Labra;E. Hernández;R. Quiñones
我们研究了智利Coliumo湾浅海底栖动物群落中个体大小（S）、物种丰富度（R）和丰度（A）之间经验关系的时间变化。我们还通过计算个人能源使用（E）和测试其与S和R的二元和三元关系是否与能量等效规则的预期一致，扩展了以前的分析。代表超过95%的样本丰度和生物量的食肉和清道夫物种进行了研究。对于每个个体，测量身体大小（g），并根据已发表的异速生长关系估计E。每个样本的数据制成表格，指数体大小箱，比较物种的平均值与个人为基础的估计，使物种可能占据多个大小类。对于以个体为基础的数据，个体和物种的数量跨越身体大小类拟合威布尔函数，而不是幂律缩放。物种丰富度也是个体数量的幂律。能源的使用显示了分段缩放关系与身体大小，与精力充沛的等价持有真正的大小类以上的模态丰度类。基于物种的数据显示弱线性或无显著模式，可能是由于体型类别的数据点数量减少。因此，个人为基础的大小谱，SRA的关系似乎是一般的，尽管季节性强迫和强烈的扰动Coliumo湾。单峰丰度分布导致分段能量标度关系，小个体显示正标度，大个体显示能量等效。因此，严格的能量等效不应该期望单峰丰度分布。另一方面，虽然基于物种的数据没有显示单峰SRA关系，但不同体型类别的能量使用没有显示出显著的趋势，支持能量等效性。
We study the temporal variation in the empirical relationships among body size (S), species richness (R), and abundance (A) in a shallow marine epibenthic faunal community in Coliumo Bay, Chile. We also extend previous analyses by calculating individual energy use (E) and test whether its bivariate and trivariate relationships with S and R are in agreement with expectations derived from the energetic equivalence rule. Carnivorous and scavenger species representing over 95% of sample abundance and biomass were studied. For each individual, body size (g) was measured and E was estimated following published allometric relationships. Data for each sample were tabulated into exponential body size bins, comparing species-averaged values with individual-based estimates which allow species to potentially occupy multiple size classes. For individual-based data, both the number of individuals and species across body size classes are fit by a Weibull function rather than by a power law scaling. Species richness is also a power law of the number of individuals. Energy use shows a piecewise scaling relationship with body size, with energetic equivalence holding true only for size classes above the modal abundance class. Species-based data showed either weak linear or no significant patterns, likely due to the decrease in the number of data points across body size classes. Hence, for individual-based size spectra, the SRA relationship seems to be general despite seasonal forcing and strong disturbances in Coliumo Bay. The unimodal abundance distribution results in a piecewise energy scaling relationship, with small individuals showing a positive scaling and large individuals showing energetic equivalence. Hence, strict energetic equivalence should not be expected for unimodal abundance distributions. On the other hand, while species-based data do not show unimodal SRA relationships, energy use across body size classes did not show significant trends, supporting energetic equivalence.