"Now the black sea urchin disappeared from all the areas I surveyed north of Hurghada to south of Marsa Alam. I could not find a single specimen." He says this suggests the species is disappearing ...

which was identified last year as the cause of a mass mortality event in the urchin species Diadema antillarum, is the same ...

Common name: English - Black (sea) urchin, German - Mittelmeerseeigel, Schwarzer Seeigel, Italian - Riccio maschio, French - Oursin noir, Spanish - Erizo negro Systematics: Arbaciidae, Arbacioida ...

1993). There are a number of other well-described examples where keystone species act as determinate predators. Sea otters (i) regulate sea urchin populations, which in turn feed upon kelp and ...

Scientists have been looking for ways to combat the spread of sea urchins. Ensuring healthy populations of predators is one ...