Unraveling dark diversity patterns of freshwater fish to identify new conservation priorities
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2026
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| author | anonymity, anonymity |
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| contents | <p>Understanding dark biodiversity (species absent from suitable habitats) patterns and drivers beyond that of observed biodiversity is promising for developing conservation strategies. However, most research focuses on terrestrial taxa, while aquatic studies, particularly for freshwater fish, often rely on site-scale frameworks overlooking hydrological connectivity and catchment boundaries, which can lead to biased potential species pool estimates. By employing a subbasin-scale framework that explicitly respects major catchment barriers, this study quantified how functional traits and environmental gradients shape native freshwater fish dark diversity at the species and subbasin levels in a biodiversity hotspot (Yunnan, China) and assessed conservation gaps. We found that the patterns and drivers of dark and observed diversity were often inconsistent. Species-level dark diversity probability (DDPspecies) was negatively associated with body lateral shape and oral gape position but positively linked to maximum body length and relative eye size. Higher habitat variability and human disturbances significantly reduced the community incompleteness index (CII) and subbasin-level dark diversity probability (DDPsubbasin), whereas historical climate instability increased them, and the effects of current climate and energy were index-dependent. Additionally, high-priority conservation areas for dark diversity and observed diversity exhibited no spatial overlap and were inadequately protected, with only 13.30–27.44% coverage by existing protected areas. This study exemplifies a framework for illustrating the patterns and drivers of dark biodiversity in freshwater taxa and highlights the mismatch between conservation priorities based on observed versus dark biodiversity, both of which should be considered in conservation planning to ensure ecosystem integrity and sustainability.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_18517178 |
| institution | Zenodo |
| language | |
| publishDate | 2026 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Unraveling dark diversity patterns of freshwater fish to identify new conservation priorities anonymity, anonymity <p>Understanding dark biodiversity (species absent from suitable habitats) patterns and drivers beyond that of observed biodiversity is promising for developing conservation strategies. However, most research focuses on terrestrial taxa, while aquatic studies, particularly for freshwater fish, often rely on site-scale frameworks overlooking hydrological connectivity and catchment boundaries, which can lead to biased potential species pool estimates. By employing a subbasin-scale framework that explicitly respects major catchment barriers, this study quantified how functional traits and environmental gradients shape native freshwater fish dark diversity at the species and subbasin levels in a biodiversity hotspot (Yunnan, China) and assessed conservation gaps. We found that the patterns and drivers of dark and observed diversity were often inconsistent. Species-level dark diversity probability (DDPspecies) was negatively associated with body lateral shape and oral gape position but positively linked to maximum body length and relative eye size. Higher habitat variability and human disturbances significantly reduced the community incompleteness index (CII) and subbasin-level dark diversity probability (DDPsubbasin), whereas historical climate instability increased them, and the effects of current climate and energy were index-dependent. Additionally, high-priority conservation areas for dark diversity and observed diversity exhibited no spatial overlap and were inadequately protected, with only 13.30–27.44% coverage by existing protected areas. This study exemplifies a framework for illustrating the patterns and drivers of dark biodiversity in freshwater taxa and highlights the mismatch between conservation priorities based on observed versus dark biodiversity, both of which should be considered in conservation planning to ensure ecosystem integrity and sustainability.</p> |
| title | Unraveling dark diversity patterns of freshwater fish to identify new conservation priorities |
| url | https://doi.org/10.5281/zenodo.18517178 |