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New study finds variation in climate conditions impact krill production in Antarctica
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Shrinking Krill Population Threatens Antarctic Ecosystem | Earth And The Environment
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Building back Miami s Biscayne Bay: Do natural solutions hold hope?
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Reef sharks do not stick to the same area throughout their lifetime, but use different habitats when they mature. This is shown by research by Wageningen University & Research (WUR) in the Caribbean Netherlands on 2 species of reef sharks, that has been published in the journal Marine Ecology Progress Series. These findings have potential implications for effectively managing and protecting these endangered species.
Scientists have used cameras at 376 locations on reefs in the waters of Saba and St. Eustatius. It turns out that mainly juvenile nurse sharks and Caribbean reef sharks swim around there: young sharks that are not yet sexually mature. ‘We have hardly observed any adult sharks,’ says researcher Twan Stoffers. ‘We think the animals mainly use these reefs as a nursery and later migrate to other habitats.’
Credit: Dione Deaker
Coral are not completely defenceless against attacking juvenile crown of thorns starfish and can fight back to inflict at times lethal damage, new research has found.
This occurs during a period of the crown of thorns starfish life cycle, where small juveniles shift from a vegetarian diet of algae to coral prey. But this change in diet makes the juveniles more vulnerable to attack by coral.
Population outbreaks of adult crown of thorns starfish, alongside coral bleaching is one of the greatest threats to tropical reef habitats.
Video footage shows when the tube feet (small tube-like projections on the underside of a starfish s arm used for movement) of juvenile crown of thorns starfish reaches out to touch the coral, the entire arm curls back to avoid the corals defensive stinging cells. To protect themselves, coral polyps have stinging cells in their sweeper tentacles and outer tissue called nematocysts, that are also used to capture food.