Endangered Guadalupe fur seals (GFS) occupy a colony on the San Benito Archipelago, a group of small islands in the Pacific. During the 2024 breeding season, researchers in Mexico and Canada examined causes of neonatal GFS morbidity and mortality and assessed potential threats to species conservation associated with entanglement, alopecia syndrome, and marine pollution. They published their results in Frontiers in Marine Science. For alopecia syndrome – a condition characterized by the loss of guard hair and damage to the underfur – they found high prevalence (21% to 26%), especially among young seals. The cause of alopecia among GFS is currently unknown.

A new, consolidated checklist of diatoms—a major group of photosynthetic microalgae—has been compiled for the Salish Sea, northeast Pacific, by a team of Canadian scientists. Integrating historical records with new reports, this first comprehensive baseline establishes a foundation for assessing diatom diversity in the region. As primary producers at the base of marine food webs, diatoms are key indicators of environmental change, providing critical insight into the health and resilience of the Salish Sea bioregion. The checklist is now published in the open-access Biodiversity Data Journal.

Researchers have discovered a new spider species in the Indian Himalayas, Theridion himalayana, which displays a striking "happy-face" pattern and polymorphic color variations nearly identical to its famous Hawaiian relative. Despite the physical resemblance, DNA analysis confirms it is a distinct lineage that evolved independently, prompting new questions about the evolutionary purpose of these patterns and the spider's specific association with ginger plants.

Sequencing environmental DNA in seawater shows the local presence or absence of species, but until now could give little information about those measures of biodiversity that are the most useful in conservation. As a proof-of-principle, scientists in the US have now shown that mitochondrial DNA in water sampled near schools of dolphins contains enough information to measure their local effective population size and monitor the health of these populations.

Neurons in the visual brain undergo quick, dynamic structural changes from hibernation that may eventually inform treatment strategies for conditions in which neuron function is lost or hindered, such as poststroke.