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Oral Presentation
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Poster Display

Systematics, Evolution, and Biodiversity

Poster: SysEB, Phylogenetics, Morphology, and Evolution

Unraveling the webs of time: Hawaiian spider biodiversity discovery from DNA metabarcoding

Tuesday, November 11, 2025
9:00 AM - 5:00 PM Pacific
Location: Exhibit Hall A-A1, OCC
Poster Display
Hawaiian spiders often exemplify adaptive radiation, evolving across the archipelago into diverse ecological niches. Their evolutionary trajectories underscore the specialness of Hawaii’s endemic araneofauna, shaped by environmental pressures and spatio-temporal isolation. However, habitat changes and the infiltration of invasive predators threaten the erosion of ecological niches, making timely molecular assessments critical for understanding and conserving these remarkable species. To investigate these evolutionary dynamics, we’ve employed DNA metabarcoding from bulk arthropod samples to generate molecular phylogenies that show a snapshot of the richness of spider lineages and highlight biogeographic patterns. Additionally, we’ve used DNA metabarcoding from spider guts and webs to provide insights into diet composition and trophic interactions, shedding light on ecological specialization and adaptive shifts. These methods allow us to assess habitat specialization, and uncover hidden biodiversity, highlighting the fragility and uniqueness of these species. The timely application of molecular tools enhances our ability to detect endemism and ecosystem dynamics, reinforcing the urgency of conservation measures to protect Hawaii’s rich arthropod heritage.