The die-off of the long-spined sea urchin Diadema antillarum in the 1980s highlighted its crucial role as a primary grazer in tropical western Atlantic coral reefs. However, natural recovery has been slow, exacerbated by a new die-off in 2022. Interest in actively restoring D. antillarum populations …

Zee-egels spelen een cruciale rol bij het behoud van de gezondheid van Caribische koraalriffen, omdat ze grazen op algen die anders koraal zouden kunnen overgroeien. In de jaren '80 stierven zee-egels massaal, met alle gevolgen van dien. De populatie is nog altijd niet op peil, hoewel de gemiddelde zee-egel …

The Dutch Caribbean is making significant strides in coral reef restoration through innovative approaches to restoring invertebrate herbivores, as presented by Alwin Hylkema of Van Hall Larenstein University of Applied Sciences and Wageningen University during the DCNA Reef Restoration Workshop. Hylkema …

Gesprek met Alwin Hylkema, marine ecoloog aan de Hogeschool Van Hall Larenstein en de Wageningen universiteit (WUR). Hij is hoofdonderzoeker en projectleider van het Diadema II project op het Caribisch eiland Saba. Daarbij herstellen ze de populatie zee-egels om het koraalrif-ecosysteem te herstellen …

That coral reefs are in decline worldwide, particularly in the Caribbean, will come as no surprise. This decades-long decline has reached a potential tipping point as the weight of the effects of climate change have come decidedly to bear on the planet’s most diverse marine ecosystem. Whether coral reefs …

Tropical western Atlantic reefs have gradually shifted from being dominated by corals to being mainly covered by macroalgae. The mass-mortality of the sea urchin Diadema antillarum in the 80s and the slow to non-existent recovery exacerbated this shift. Chemical cues associated with these reefs are expected …

With increasing activities of multiple sectors in marine spaces, management of marine social–ecological systems requires more holistic approaches. Adopting such an approach, however, presents difficult institutional and disciplinary challenges. Here, we use the International Council for the Exploration …

Echinoderm mass mortality events shape marine ecosystems by altering the dynamics among major benthic groups. The sea urchin Diadema antillarum, virtually extirpated in the Caribbean in the early 1980s by an unknown cause, recently experienced another mass mortality beginning in January 2022. We investigated …

Wat is de invloed van licht op vissen? Dat proberen onderzoekers van de Universiteit Leiden en hogeschool Van Hall Larenstein uit te zoeken. Bij het gemaal van Roptasyl wordt een proef gedaan.

The objective of this chapter is to give insight in marine governance challenges, illustrated by Arctic shipping. To do this, this chapter presents a theory of marine governance as reflexive institutionalization, in which the structural properties of marine governance arrangements are (re)produced in …