Biodiversity and Conservation ( IF 3.0 ) Pub Date : 2023-03-10 , DOI: 10.1007/s10531-023-02574-2 Aileen C van der Mescht , James S Pryke , René Gaigher , Michael J Samways
Species present in transformed landscapes utilise resources from either the transformed patches, natural patches, or both. Depending on the degree to which species are specialised, species-specific responses to landscape transformation is both varied and dynamic. Understanding species-specific responses across a landscape is therefore essential to make informed conservation decisions. We investigate how spillover of stenotopic, cultural, and ubiquitous insect species respond to the different edge combinations present in a timber plantation mosaic. We use a multi-taxon approach, sampling two distinct insect assemblages (ground and foliage) across four different biotopes in a grassland-forest-plantation landscape in the Midlands of KwaZulu-Natal, South Africa, which forms part of the Maputaland-Pondoland-Albany biodiversity hotspot. We show that in this landscape, ecological networks consisting of natural grassland and forest supported high insect diversity in both ground and foliage assemblages. The foliage assemblage displayed stronger responses to the different biotope combinations than the ground assemblage. There was remarkably little spillover of habitat specialist species of either the ground or foliage assemblages from grassland or forest into the plantation stands. The few species associated with plantation stands (cultural species) had consistent levels of spillover across different types of plantation blocks, but not into the natural areas. Natural biotopes in this landscape conserved many habitat specialists, whereas plantations maintained low levels of diversity. Thus, we recommend that conservation practitioners consider the fidelity and spillover of the species present in the local landscape before designing conservation plans in these dynamic production landscapes.
中文翻译:
残余栖息地斑块为木材种植园马赛克中的各种昆虫物种提供了高价值
改造景观中存在的物种利用来自改造斑块、自然斑块或两者的资源。根据物种的专业化程度,特定物种对景观转变的反应既多样又动态。因此,了解整个景观中特定物种的反应对于做出明智的保护决策至关重要。我们调查了狭窄的、文化的和无处不在的昆虫物种的溢出如何对木材种植园马赛克中存在的不同边缘组合做出反应。我们使用多分类方法,在南非夸祖鲁-纳塔尔中部地区的草原-森林-人工林景观中的四个不同生境中对两种不同的昆虫组合(地面和树叶)进行采样,该景观构成了马普塔兰-庞多兰-奥尔巴尼生物多样性热点。我们表明,在这个景观中,由天然草地和森林组成的生态网络支持地面和树叶组合中的高度昆虫多样性。与地面组合相比,叶子组合对不同生境组合表现出更强的反应。草地或森林的地面或树叶组合的栖息地专家物种几乎没有溢出到人工林中。与人工林相关的少数物种(栽培种)在不同类型的人工林地块中具有一致的溢出水平,但没有进入自然区域。该景观中的自然生境保存了许多栖息地专家,而种植园则保持了低水平的多样性。因此,