Abundance and biomass of the Invasive Kelp Undaria pinnatifida (Harvey) Suringar, 1873 Along Artificial and Natural Habitats in North Portugal

The kelp Undaria pinnatifida is considered one of the 100 worst invasive species in the world. The presence of Undaria in Portugal was reported more than 20 years ago, but there is not recent detailed information about its distribution and impacts. The aim of this dataset is to provide updated data about the abundance and biomass of Undaria in marinas and natural habitats along the north Portuguese coast. This data can provide valuable insights about Undaria impacts and distribution both in natural and artificial habitats.