Native European flat oyster (Ostrea edulis) reefs have strongly declined in the Dutch Delta, motivating restoration efforts that use engineered substrates to support settlement and early reef development. In Lake Veere, Project Asta tests the Mother Reef concept: biodegradable clay blocks that are conditioned …

The restoration of native flat oyster (Ostrea edulis) reefs in Lake Veere is a key ecological goal of the Oyster Heaven project. However, successful reef development may be hindered by predation. The European green crab *(Carcinus maenas),* a known bivalve predator in Lake Veere. This study investigated …

Gili Ketapang is a small island located in East Java, Indonesia. The island is currently experiencing environmental changes due to coastal erosion and the decline of its coral reef ecosystem. At the same time, the population is growing, and economic activities centred around fishing and tourism are expanding. …

Oyster reefs were once abundant in European waters, but they are now rare. In Zeeland, the wild population of the native flat oyster (Ostrea edulis) has declined significantly in recent decades, with serious implications for coastal water health in relation to biodiversity and water quality (Colsoul …

Climate change is a major threat for the Hawksbill turtle (Eretmochelys imbricata). A lot of research has been done on the possible effects, but a clear overview is still lacking. This literature review aims to provide an overview of the effects of climate change on the nesting success, sex ratio and …

Al jaren bestaat er discussie en onduidelijk over de kwalificatie van de arbeidsovereenkomst en de overeenkomst van opdracht voor zzp’ers. Zzp’ers worden namelijk in sommige gevallen onterecht onder een overeenkomst van opdracht geplaatst terwijl er in de praktijk sprake zou zijn van een arbeidsovereenkomst …

The Netherlands is a densely populated and economically developed country. Coastal areas are important for aquaculture, agriculture, harbors, and urban development. Coastal habitats mainly exist on the south Delta coast and the north Wadden sea, hosting a great biological diversity. The Netherlands had …

Coral reefs are of great importance for social, biological and economical purposes. However, due to global and local threats they are declining rapidly. One of the ways to sustain coral reefs is sexual coral propagation. While the sexual propagation of corals for reef rehabilitation has been successful …

The coral reef ecosystem provides important services such as tourism revenue, food, pharmaceutical products and coastal defence. Coral reefs are under a severe amount of threats such as pollution, overfishing and climate change. These threats result in a decrease of coral reefs and so a decrease in three- …

For multiple reasons, such as changing ocean temperatures, overfishing and unsustainable tourism coral reefs are declining worldwide. A negative feedback loop is created by the loss of three-dimensional structures that the coral reefs create. These three-dimensional structures provide shelters for grazing …