La Concepción is a unique area for flora and birdlife.

In the coastal area, where the influence of the sea is stronger, reed beds and salt marshes predominate. Here, the species are adapted to the wind and salinity, and there is a great abundance of endemic or rare species, both in rocky areas (socarrell, sea cake, margalideta, thyme border, etc.) and in flooded and humid areas (salson revulledo or Triglochin barrelieri, among others). In addition, in the submerged area there are communities of Alguero and Cymodocea nodosa.

The silicicolous marine vegetation of the southern salt flats thrives largely on humid sandy substrates and favours the presence of communities of Isoetes that include rare small annual species (Solenopsis Laurenti, Lotus parviflorus or Radiola linoides), and endemics such as the tongues (Serapias nurrica).

The salt marshes are a paradise for birds, precisely because of the presence of salt marshes. It is an important wintering area for herons, flamingos, great cormorants, various species of ducks, such as the white pochard, and numerous waders. The group of waders has a special place during the migration season, when they form the majority of the species that can be seen on the island. During the breeding season, the small black-footed passerine (gravelot) nests here.