Giraffes living in the South Sudan’s war-torn savannas are genetically healthy and connected to nearby giraffe populations by gene flow, despite decades of conflict, recent research suggests. These findings show that “regions of the world that have been affected by conflict can maintain a lot of biodiversity and should therefore not be overlooked by genetic studies and conservation efforts,” Sam van Giessen, study lead author and a conservation genomics researcher from the University of Amsterdam, Netherlands, told Mongabay by email. The IUCN, the global wildlife conservation authority, currently recognizes four species and seven subspecies of giraffes. South Sudan is home to two subspecies of the critically endangered northern giraffe (Giraffa camelopardalis): the Nubian giraffe (G. c. camelopardalis) and the Kordofan giraffe (G. c. antiquorum). Between the conflict years of 1985 and 2025, Nubian giraffes in Ethiopia and South Sudan declined by 95%. By 2025, researchers estimated roughly 235 Nubian giraffe survived across South Sudan in isolated pockets, down from an estimate of 15,000 individuals in 1995. To find out the genetic health of these giraffe populations, researchers from the South Sudan government, the Giraffe Conservation Foundation (GCF), and conservation NGO African Parks analyzed DNA from skin biopsies collected from 30 Nubian giraffes in Boma and Badingilo national parks, run by African Parks. As the giraffe population in the region is small, there was some concern that inbreeding could be a problem for the subspecies’ long-term conservation. However, their analysis showed the South Sudan Nubian giraffe population has relatively high levels…This article was originally published on Mongabay

Plastic pollution could disrupt the bioluminescent light produced by deep-sea organisms, researchers warn in a letter in the journal Cambridge Prisms: Plastics. When deep-sea organisms ingest plastics, it could disrupt the chemical pathways that create bioluminescence and damage the tissues in their bodies, impairing their ability to find food and a mate, the authors said. In the deep sea, up to 80% of organisms with complex cells are believed to be bioluminescent, the only source of light in the darkest parts of the ocean. The light these organisms create is essential for their survival and reproduction, the letter notes. Disruption of their bioluminescence could negatively impact food webs and ecosystem functions in the deep sea, the largest and least-explored biome on Earth, the letter says. In an email to Mongabay, co-author Renjith VishnuRadhan of Amity University in India offered the example of an anglerfish. “It is widely recognizable from documentaries and films such as Finding Nemo,” he said. “Female deep-sea anglerfish have a modified dorsal spine ending in a luminous lure called the esca. Light produced by symbiotic bacteria helps attract prey and may also assist with recognition or communication in darkness.” It’s well-established that bacterial bioluminescence can be affected by pollutants, VishnuRadhan said, and ingestion of toxic plastic additives by anglerfish could disrupt the bacterial symbiosis in the lure, theoretically affecting its luminous signaling. The authors note there’s some evidence of plastic pollution impacts on deep-sea ecosystems, but scientists lack the high-quality data and observations needed to understand the…This article was originally published on Mongabay