Key Highlights
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A new study around Southampton Island, Nunavut, reveals that Arctic marine food webs can be completely restructured over short distances: the deeper north relies on phytoplankton and supports four trophic levels, while the shallower south is driven by ice algae and is heavily controlled by walruses, which limit the food web to just three levels. This finding is crucial because it shows that small-scale variations in depth and ice cover can have dramatic effects on ecosystem structure, with implications for how Arctic food webs will respond to rapidly changing sea ice conditions.
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A new study on locust trees found that populations living outside their native range, such as invasive populations in Europe, use different resource allocation strategies to survive drought better than native populations. This matters because it helps explain how some invasive plants can thrive and spread in new environments, especially as droughts become more frequent and severe due to climate change.
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Scientists have discovered a “reciprocal glial circuit” in the brain where astrocytes and microglia talk to each other to calibrate the response to injury, with microglia releasing IL-1β to put a brake on excessive ATP release from astrocytes. This discovery is significant because it identifies a new, balanced control mechanism that prevents damage from an overactive brain injury response while still allowing repair, opening up potential new targets for treating brain injuries.
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