Habitat heterogeneity overrides the species-area relationship
Habitat heterogeneity overrides the species-area relationship
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DOI：
10.1111/j.1365-2699.2007.01825.x
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发表时间：
2008-04-01
影响因子：
3.9
通讯作者：
Baldi, Andras
中科院分区：
文献类型：
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作者：
Baldi, Andras
目的最明显的，但不是唯一的，物种丰富度的增加与样本面积（种面积关系）的解释是，物种丰富度最终与基于面积的增加栖息地异质性。本文的目的是研究在确定自然保护区物种丰富度的面积和栖息地异质性的相对重要性。具体而言，这项工作测试的假设，物种面积的关系是不积极的，如果栖息地异质性不增加与area.Location十六个自然保护区（面积范围89- 11030公顷）在匈牙利中部。70名野外工作者和65名分类学家。CORINE 50,000土地覆盖图被用来计算保护区景观的异质性（栖息地类型的数量，栖息地斑块的数量和总长度的边缘）。结果大储备比小储备的异质性较低，可能是因为大储备建立在大块的非生产性土地，而小储备往往是在更肥沃的土地。共有3975种节肢动物被纳入分析。种-面积关系的斜率仅为脉翅目和毛翅目。其他9个类群（弹尾目、阿卡里、直翅目、缨翅目、鞘翅目、蜘蛛目、倍足目、唇足目、双翅目）之间没有明显的亲缘关系。所有物种的密度（物种数公顷（-1）），然而，表现出正相关与heterogeneity.Main结论一般缺乏适合的种-面积关系在这项研究中是不一致的，与大多数以前发表的研究。重要的是，与许多其他研究不同，栖息地异质性与研究系统中的保留区不相关。在没有这种来源的协变，更强的关系被确定，这表明物种丰富度和栖息地异质性之间的根本联系。结果表明，生境异质性，而不是本身的面积是最重要的预测物种丰富度在所研究的系统。
Aim The most obvious, although not exclusive, explanation for the increase of species richness with increasing sample area (the species-area relationship) is that species richness is ultimately linked to area-based increases in habitat heterogeneity. The aim of this paper is to examine the relative importance of area and habitat heterogeneity in determining species richness in nature reserves. Specifically, the work tests the hypothesis that species-area relationships are not positive if habitat heterogeneity does not increase with area.Location Sixteen nature reserves (area range 89-11,030 ha) in central Hungary.Methods Four-year faunistic inventories were conducted in the reserves involving c. 70 fieldworkers and 65 taxonomists. CORINE 50,000 land-cover maps were used for calculating the heterogeneity of the reserve landscape (number of habitat types, number of habitat patches and total length of edges).Results Large reserves were less heterogeneous than small reserves, probably because large reserves were established in large blocks of unproductive land whereas small reserves tended to be in more fertile land. In total, 3975 arthropod species were included in the analysis. The slope of the species-area relationship was positive only for Neuroptera and Trichoptera. There was no significant relationship in the other nine taxa examined (Collembola, Acari, Orthoptera, Thysanoptera, Coleoptera, Araneae, Diplopoda, Chilopoda, Diptera). The density (number of species ha(-1)) of all species, however, showed a positive correlation with heterogeneity.Main conclusions The general lack of fit of species-area relationships in this study is inconsistent with most previous published studies. Importantly, and unlike many other studies, habitat heterogeneity was not correlated with reserve area in the studied system. In the absence of this source of covariation, stronger relationships were identified that suggested a fundamental link between species richness and habitat heterogeneity. The results indicate that habitat heterogeneity rather than area per se is the most important predictor of species richness in the studied system.