Areal extent of native mangroves, Avicennia marina , has doubled in Bay of Islands since 1951. This expansion is widely attributed to deforestation and poor land‐use practices beginning in the late 1800s to early 1900s, and led to greatly transformed intertidal and supratidal habitats. One example has been the ecological isolation and crowding (sometimes, colonisation) by mangroves of shelly beaches, together with their associ...