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 …

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 …

De vangst grootte van vissen en de omvang van het visbestand op de Saba Bank zijnonderwerpen van zorg in verschillende studies (Brunel et al., 2021; Dilrosun, 2000;Meesters et al., 1996; Toller & Lundval, 2008). Gegevens over de levensgeschiedenis,zoals lengte, gewicht en levensfase, zijn cruciaal om …

In this research there was looked at the connection between the Zeta potential and the pressure sensitivity of a chloroprene dispersion in order to gain insight in dispersion stability. This was done by varying the pH and ionic strength of the chloroprene dispersion. There was also looked at whether …

Western cities are rapidly densifying, and new building typologies are being invented to mitigate high-rise and balance residential, commercial and recreational functions. This vertical urbanization requires rethinking the traditional design of public space to promote citizens’ well-being. While the …

Built environments are increasingly vulnerable to the impacts of climate change. Most European towns and cities have developed horizontally over time but are currently in the process of further densification. High-rise developments are being built within city boundaries at an unprecedented rate to accommodate …

Donderdag bezocht de koninklijke familie Saba. Ze gingen langs bij een project van Nederlandse wetenschappers van hogeschool Van Hall Larenstein die door middel van zee-egels het afstervende koraalrif helpen herstellen.

The 1983-1984 die-off of the long-spined sea urchin Diadema antillarum stands out as a catastrophic marine event because of its detrimental effects on Caribbean coral reefs. Without the grazing activities of this key herbivore, turf and macroalgae became the dominant benthic group, inhibiting coral recruitment …

Diadema sea urchins (Diadema antillarum) are important algae grazers, but restoration attempts often record low survival of restocked individuals. This article sheds light on one of the causes for unsuccessful restocking. Restocked sea urchins were monitored with time-lapse cameras for 10 days. There …