New widow spider record of Latrodectus dahli Levi (Araneae: Theridiidae) extends known range in Northern Saudi Arabia

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  Image Credit: iNaturalist Photo 400937400, (c) Kian, some rights reserved (CC BY), uploaded by Kian, https://www.inaturalist.org/photos/400937400 New widow spider record of Latrodectus dahli Levi (Araneae: Theridiidae) extends known range in Northern Saudi Arabia ABSTRACT Researchers have documented the first confirmed occurrence of Dahl’s widow spider ( Latrodectus dahli vn Saudi Arabia’s Ha’il Region, extending the species’ known range into the country’s north. The finding fills an important gap in the spider’s Middle Eastern distribution and highlights how even medically important species remain under-documented in parts of the Arabian Peninsula. L. dahli Levi is a medically significant widow spider that is found in North Africa, Cyprus, Turkey, Azerbaijan, Kazakhstan, the Middle East, Iran and Central Asia. Prior to our work, there had been no records of it in northern Saudi Arabia although it had been found in central regions of Saudi Arabia such as Al Duwadimi, Riyadh and ...

Wildflower Strips Promote Spider Diversity and Biological Control Potential in a Semi-Arid Agroecosystem: Preliminary Insights from a Single Growing Season

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Wildflower Strips Promote Spider Diversity and Biological Control Potential in a Semi-Arid Agroecosystem: Preliminary Insights from a Single Growing Season

Abstract

Agricultural intensification degrades farmland biodiversity, prompting the use of wildflower strips to restore natural enemy populations. However, their spatio-temporal effects on predators in arid agroecosystems remain unclear. Therefore, we investigated ground-dwelling spiders in sown wildflower strips versus natural margins across four cropping systems in arid northwestern China using pitfall traps along a spatial gradient throughout the growing season. While the overall diversity did not differ significantly between treatments, three key patterns emerged: First, spider abundance remained stable across the spatial gradient, whereas taxonomic diversity increased significantly toward the crop interior. Second, while communities in natural margins peaked early and declined during the hot, dry mid-summer, wildflower strips maintained large populations, acting as crucial temporal refuges. Third, wildflower strips reorganized species co-occurrence networks, fostering more resilient community structures. We conclude that in water-limited environments, wildflower strips stabilize predator populations during harsh weather and enhance community resilience. These findings highlight the value of incorporating these strips when designing sustainable ecological pest management strategies for arid agroecosystems.

Tuo, M., Hu, W., Wu, D., Liu, W., Wang, S., Long, X., & Jin, Y. (2026). Wildflower Strips Promote Spider Diversity and Biological Control Potential in a Semi-Arid Agroecosystem: Preliminary Insights from a Single Growing Season. Insects, 17(7), 722. https://doi.org/10.3390/insects17070722