Biodiversity inventories, indicator taxa and effects of habitat modification in tropical forest
Biodiversity inventories, indicator taxa and effects of habitat modification in tropical forest
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作者：
Lawton, JH;Bignell, DE;Watt, AD
尽管人们对热带森林干扰和清除对生物多样性的影响表示关切（1、2），但有关影响的数据，特别是对无脊椎动物的影响的数据仍然很少（3-8）。在这里，我们报告了一个分类上不同的清单在一个地方的热带森林改造的影响，我们研究了一个梯度，从近小学，通过古老的生长次生林和种植园林完成清除，八个动物群体（鸟类，蝴蝶，飞甲虫，冠层甲虫，冠层蚂蚁，落叶蚂蚁，白蚁和土壤线虫）在Mbalmayo森林保护区，喀麦隆中南部。虽然物种丰富度一般随干扰的增加而下降，但没有一个类群可以作为其他类群物种丰富度变化的良好指示类群（9-12）。不同地点的物种更替（周转）沿着梯度在分类学组之间也不同，不能指定为命名种的“形态种”的比例和处理样品所需的“科学家小时”的数量对于较小的个体分类群都显着增加，来自这八个组的数据表明提供热带多样性清单所需的巨大规模的生物努力，并衡量热带森林改造和砍伐的影响。
Despite concern about the effects of tropical forest disturbance and clearance on biodiversity(1,2), data on impacts, particularly on invertebrates, remain scarce(3-8). Here we report a taxonomically diverse inventory on the impacts of tropical forest modification at one locality, We examined a gradient from near-primary, through old-growth secondary and plantation forests to complete clearance, for eight animal groups (birds, butterflies, flying beetles, canopy beetles, canopy ants, leaf-litter ants, termites and soil nematodes) in the Mbalmayo Forest Reserve, south-central Cameroon. Although species richness generally declined with increasing disturbance, no one group sen es as a good indicator taxon(9-12) for changes in the species richness of other groups. Species replacement from site to site (turnover) along the gradient also differs between taxonomic groups, The proportion of 'morphospecies' that cannot be assigned to named species and the number of 'scientist-hours' required to process samples both increase dramatically for smaller-bodied taxa, Data from these eight groups indicate the huge scale of the biological effort required to provide inventories of tropical diversity, and to measure the impacts of tropical forest modification and clearance.