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首页> 外文期刊>Conservation Biology >Predictors of species richness in northwest Florida longleaf pine sandhills
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Predictors of species richness in northwest Florida longleaf pine sandhills

机译：佛罗里达西北长叶松树沙丘物种丰富度的预测因子

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Soil characteristics, disturbance histories, and species richness among distinct groups of plants and animals may be useful predictors of important conservation areas when data are limited. We used multivariate analysis of covariance to test the hypothesis that the species richness of plants, arthropods, herpetofauna, and breeding birds are correlated and increase with soil fertility (silt and clay content in sandy soils), soil variability, and hardwood midstory reduction in subxeric, nutrient-poor longleaf pine sandhills at Eglin Air Force Base in northwest Florida. During 1994-1995 and 1998-1999, we sampled 30 81-ha plots with varying fire-exclusion histories and at two spatial scales of resolution (10 x 40 m and 81 ha). The relationship between the number of plant species and percent silt and clay and its coefficient of variation was significant and positive at the plot level (81 ha) but not at the subplot level (10 x 40 m). Herpetofaunal species richness was the only faunal variable that increased with silt and clay content, but the coefficient of variation did not. Multivariate effects of hardwood reduction were significant in 1998-1999 but not in 1994-1995, which suggests that the reintroduction of fire increased species richness across taxa. Univariate effects of hardwood reduction were marginally significant for plant species richness at the subplot level and not significant for herpetofaunal species richness at either scale. Plant and arthropod species richness were not correlated. Herpetofaunal species richness was not correlated with that of other taxa (plant and animal). The species richness of plants and arthropods were each significantly positively correlated with the richness of breeding bird species at the subplot level during 1994-1995, whereas only arthropod species richness was positively correlated with bird species richness at the plot level in either year. Our results suggest that the restoration of fire regime may be the most effective tool with which to increase diversity in pyrogenic areas considered for conservation protection. [References: 50]
机译：当数据有限时，不同动植物组之间的土壤特征，干扰历史和物种丰富度可能是重要保护区的有用预测指标。我们使用协方差的多元分析来检验以下假设：植物，节肢动物，爬虫类和繁殖鸟类的物种丰富度与土壤肥力（沙质土壤中的泥沙和黏土含量），土壤变异性和硬木在次生干旱中的减少有关，位于佛罗里达西北部埃格林空军基地的营养不良的长叶松沙丘。在1994-1995年和1998-1999年期间，我们对30个81公顷的样地进行了采样，这些地块具有不同的防火记录，并且分辨率为两个空间尺度（10 x 40 m和81公顷）。在样地水平（81公顷）上，植物物种数量与粉尘和黏土百分比及其变异系数之间的关系是显着且为正的，而在子样地水平（10 x 40 m）则不是。爬虫类物种丰富度是唯一随泥沙和粘土含量增加而增加的动物变量，但变异系数却没有。硬木减少的多重影响在1998-1999年很明显，但在1994-1995年却没有，这表明重新引入火种增加了整个分类群的物种丰富度。硬木减少的单变量效应在亚样地水平上对于植物物种丰富度仅具有显着意义，而在任一规模上对于草本植物型植物物种丰富度均不显着。植物和节肢动物的物种丰富度不相关。爬虫的物种丰富度与其他类群（动植物）的丰富度不相关。在1994-1995年期间，植物和节肢动物的物种丰富度与繁殖鸟类物种的丰富度均呈显着正相关，而在任一年份中，节肢动物物种的丰富度与鸟类物种丰富度均呈正相关。我们的结果表明，恢复火势可能是最有效的工具，可用来增加被视为保护性保护的热源地区的多样性。 [参考：50]

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