Early steps in the primary succession of seaweed communities at the Tagogaite volcano lava flows (Canary Islands, Spain)

1. Carlos Sangil
2. Daniel Álvarez-Canal ¹
3. Javier Reyes
4. Julián Rodríguez
5. Sabin Liulea
6. Julio Afonso-Carrillo
7. Yesica Concepción
8. Nereida M. Rancel Rodríguez ¹
9. Marta Sansón ¹

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Abstract

On September 19 of 2021 the Cumbre Vieja volcano ridge (La Palma Island) erupted. The lava flowedfrom 1100 m height to the sea generating several lava deltas and new and sterile rocky reefs. Two monthsafter the eruption ended, we started to monitor these new habitats with the aim of describe the primarysuccession of the seaweed communities. Samplings were performed in the intertidal as well as in thesubtidal from 5 to 20 m depth at 2, 4.5, 7, 9 and 13 months. In addition, the study design included acontrol zone, the lava deltas of the San Juan volcano (1949) to contrast the succession with stable-stagecommunities.The total seaweed cover was high in the lava flows and similar to the control zone from the beginningof the monitoring. In both in the intertidal and in the subtidal habitats, the substrate was almostcompletely covered by algae. Richness and species composition of communities was different in the twostudied habitats. The number species in lava flows was initially low but gradually increased after 2months, however after 13 months many species in the control zone had not yet colonized the deltas.Communities in the primary succession had similar structure in both habitats, and initially weredominated in terms of cover by fast-growing species such as filamentous brown algae and diatoms. Overtime, perennial species have gradually been incorporated, but even after 13 months the communities inthe deltas were still different from those in the control zone. However, in the intertidal the successionhas been faster than in the subtidal due to the larger incorporation of perennial species, and thereforethese communities have begun to resemble those of a climax community.