EFFECTS OF SAMPLING EFFORT ON CHARACTERIZATION OF FOOD-WEB STRUCTURE
EFFECTS OF SAMPLING EFFORT ON CHARACTERIZATION OF FOOD-WEB STRUCTURE
复制标题
采样工作对食物网结构特征的影响
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
B. P. Feifarek
中科院分区：
文献类型：
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作者：
Neo D. Martinez;B. Hawkins;H. Dawah;B. P. Feifarek
食物网理论的一个重要而又知之甚少的方面是，变量观察的努力，如调查人员之间广泛不同的采样强度，混淆了结构食物网模式。我们评估了这种可能性，通过模拟变量的观察努力的结构上的食物网，包括77种昆虫的茎内发现的10种草的影响。一个非常详细的描述，这个社区的营养结构提供了一个详尽的抽样计划，涉及解剖164 215草茎超过12年。 最重要的是，这些数据描述了每一个消费者和他们的126个不同的营养链被观察到的频率。在模拟增加采样，一致的趋势，观察到营养物种网的物种丰富度增加到最大的73个营养物种。连接保持惊人的恒定，而顶部和底部的物种的分数下降，和。
A critical and poorly understood aspect of food-web theory concerns the possibility that variable observation effort, such as widely different sampling intensities among investigators, confounds structural food-web patterns. We evaluated this possibility by simulating the effects of variable observation effort on the structure of a food web including 77 insect species found inside the stems of 10 species of grasses. A highly detailed description of the trophic structure of this community was provided by an exhaustive sampling program involving dissection of 164 215 grass stems over 12 yr. Most significantly, the data describe the frequency at which each of the consumers and their 126 different trophic links were observed. During the simulated increase in sampling, consistent trends were observed among trophic-species webs as the species richness of these webs increased to a maximum of 73 trophic species. Connectance remained surprisingly constant, while the fractions of top and basal species decreased, an...