Biogeographic Implications of Biodiversity Shortfalls in a Mid-Altitude Desert Ecotone of the Arabian Peninsula

IF 4.6 2区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION
André Vicente Liz, Fulvio Licata, Bárbara Santos, Duarte Vasconcelos Gonçalves, Margareta Lakušić, Myrto Roumelioti, Nina Serén, Pedro Tarroso, Ayman Abdulkareem, Patkó László, José Carlos Brito
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Abstract

Aim

Macroscale biodiversity inferences are critical for spatial conservation planning, yet they are affected by the limitations of global datasets and the paucity of genetic data. In this study, we conducted a comprehensive sampling campaign and explored how biodiversity shortfalls impact spatial diversity metrics across a mid-altitude desert ecotone, where mega conservation and restoration projects are underway.

Location

AlUla region (NW Arabian Peninsula).

Taxa

Terrestrial reptiles.

Methods

We generated a DNA barcode library including 580 field-collected samples to investigate species distributions, candidate species and intraspecific diversity. Species distributions were mapped using climatic envelopes, while candidate species and intraspecific diversity were assessed with phylogenetic methods. Patterns of α and β diversity were mapped based on IUCN and GARD expert maps (expected diversity) and on an integrative assessment combining field and bibliographic occurrences (observed diversity). Topographic drivers of nucleotide diversity were tested using Generalised Linear Mixed Models.

Results

Over one-third of the verified species in the region (n = 58) experienced Linnean, Wallacean or Darwinian shortfalls, including 6 candidate species, 11 new to the region and 7 harbouring significant intraspecific diversity. Additionally, 13 species predicted by expert maps were absent. Both IUCN and GARD projections showed significant mismatches with observed α and β diversity, though GARD provided α-diversity estimates closer to observed patterns. Nucleotide diversity increased with absolute altitude.

Main Conclusions

Field and genetic-based data significantly enhance biodiversity knowledge and conservation tools for this rapidly developing desert region. By addressing the critical limitations of macroscale approaches in undersampled yet diverse landscapes, we demonstrate how global databases often overlook local community turnovers, misleading diversity estimates. Thereby, we highlight the need for fine-scale integrative research to inform conservation strategies and the power of DNA barcoding for inter- and intraspecific biodiversity assessments.

Abstract Image

阿拉伯半岛中海拔荒漠交错带生物多样性缺失的生物地理学意义
目的宏观尺度生物多样性推断对空间保护规划至关重要,但受到全球数据集的限制和遗传数据的缺乏的影响。在这项研究中,我们进行了全面的采样活动,并探讨了生物多样性短缺如何影响中等海拔沙漠过渡带的空间多样性指标,在那里正在进行大型保护和恢复项目。位置:AlUla地区(阿拉伯半岛西北部)。分类群陆生爬行动物。方法建立了580份野外采集标本的DNA条形码文库,分析了物种分布、候选物种和种内多样性。利用气候包络图绘制物种分布图,利用系统发育方法评估候选物种和种内多样性。α和β的多样性模式是基于IUCN和GARD专家图(预期多样性)和结合野外和文献发生的综合评估(观察多样性)绘制的。使用广义线性混合模型测试了核苷酸多样性的地形驱动因素。结果超过三分之一的物种(n = 58)经历了林奈式、华莱士式或达尔文式的不足,包括6个候选物种、11个新物种和7个种内多样性显著的物种。此外,专家地图预测的13个物种缺失。尽管GARD提供的α-多样性估计值更接近于观测模式,但IUCN和GARD的预测结果与观测到的α和β多样性存在显著的不匹配。核苷酸多样性随绝对海拔增加而增加。野外和遗传数据显著增强了这一快速发展的沙漠地区的生物多样性知识和保护工具。通过解决宏观尺度方法在样本不足但多样性景观中的关键局限性,我们展示了全球数据库如何经常忽略当地社区的流动率,误导多样性估计。因此,我们强调需要进行精细尺度的综合研究,为保护策略提供信息,并利用DNA条形码进行种间和种内生物多样性评估。
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来源期刊
Diversity and Distributions
Diversity and Distributions 环境科学-生态学
CiteScore
8.90
自引率
4.30%
发文量
195
审稿时长
8-16 weeks
期刊介绍: Diversity and Distributions is a journal of conservation biogeography. We publish papers that deal with the application of biogeographical principles, theories, and analyses (being those concerned with the distributional dynamics of taxa and assemblages) to problems concerning the conservation of biodiversity. We no longer consider papers the sole aim of which is to describe or analyze patterns of biodiversity or to elucidate processes that generate biodiversity.
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