Sampling procedures and species estimation: testing the effectiveness of herbarium data against vegetation sampling in an oceanic island
Sampling procedures and species estimation: testing the effectiveness of herbarium data against vegetation sampling in an oceanic island
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DOI：
10.1111/j.1654-1103.2010.01247.x
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发表时间：
2011-04-01
影响因子：
2.8
通讯作者：
Ezcurra, Exequiel
中科院分区：
文献类型：
--
作者：
Garcillan, Pedro P.;Ezcurra, Exequiel
植物标本馆中的物种组合与野外物种丰度之间的关系是什么？植物标本馆的数据在植被科学中的可信度如何？LocationGuadalpine Island，下加利福尼亚，Mexico.MethodsWe比较了110个植被样地中的物种多度分布和均匀度，并与4个标本库的数据进行了比较。我们测试是否来自植物标本馆标本的相对频率显着不同的物种在外地的频率。我们比较了两个领域和植物标本数据集的稀疏曲线，并测试是否分类收集器积累了新的物种在更高的速度比观察到的生态图sampling.ResultsAt任何给定的采样努力，观察到的物种总数较高的植物标本数据。野外常见种的相对多度高于植物标本馆数据，而分布的均匀度低于植物标本馆数据。在野外和标本库中的物种丰度之间没有显着的相关性。通过选择性地针对稀有物种，收藏家积累以前看不见的物种比通过ecological sampling.ConclusionsBecause收藏家的目标是稀有物种，避免更常见的，植物标本馆收藏的物种的相对丰度不能被解释为预测其真正的丰富领域。任何统计程序，要求样本是真正的丰度分布的代表是可能显示错误时，应用于植物标本馆的数据。然而，由于采集者积极寻找稀有物种，其物种积累率更高，其植物区系列表比通过生态实地采样获得的更完整。
QuestionsWhat is the relationship between species assemblages in herbarium collections and species abundances in the field, and how trustworthy are herbarium data in vegetation science?LocationGuadalupe Island, Baja California, Mexico.MethodsWe compared species-abundance distribution and evenness in 110 vegetation plots in Guadalupe Island against data from four herbaria. We tested whether the relative frequencies derived from herbarium specimens differed significantly from species frequencies in the field. We compared the rarefaction curves for both field and herbarium data sets, and tested whether taxonomic collectors accumulated new species at a higher rate than that observed in ecological plot sampling.ResultsAt any given sampling effort, the total number of observed species was higher in herbarium data. The relative abundance of common species in the field was higher, and the evenness of the distribution was lower, than in herbarium data. There was no significant correlation between species abundances in the field and in the herbaria. By selectively targeting rare species, collectors accumulate previously unseen species much faster than through ecological sampling.ConclusionsBecause collectors aim for the rarer species and avoid the more common ones, the relative abundance of species in herbarium collections cannot be interpreted as a predictor of their true abundance in the field. Any statistical procedure that requires the sample to be representative of the true abundance distribution is likely to show errors when applied to herbarium data. However, because collectors actively search for rare species their rate of species accumulation is higher and their floristic lists are more complete than those obtained through ecological field sampling.