Abstract
This bionomic study of the detritic bottoms dominated by macroalgae from the south of Mallorca (Balearic Islands, Western Mediterranean) includes a quantitative description of the algal communities found in the area, as well as their bathymetric and geographical distribution. The results presented here are based on data collected in two oceanographic campaigns conducted in July 2012 and September 2014, using a Jennings beam trawl. A hierarchical group average agglomerative clustering, accompanied by the SIMPROF test, allowed the identification of seven different macroalgal communities, of which two are described here for the first time: the Cryptonemia longiarticulata fields and the Maërl beds of indeterminate rhodoliths. Depth and rhodolith abundance were the two main features driving the distribution of these communities. We found that seven species contributed 70% of the similarity between samples (SIMPER test), with the indeterminate species of rhodoliths (23.6%) and the encrusting fleshy red alga, Agissea inamoena (15.6%) being the most important. The methodology used for the sample selection and quantification processes turned out to be very efficient and faster than other methods used for the characterization of macroalgal communities from detritic bottoms, suggesting that this study could serve as a baseline for similar studies and for future management and conservation actions.
Funding source: Conselleria d’Agricultura, Medi Ambient i Territori de les Illes Balears
Funding source: CN Instituto Español de Oceanografía (IEO-CSIC)
About the authors
Sergi Joher has a degree in Biology and a doctorate from the University of Girona (UdG). With other members of the UdG’s Algues Bentòniques Marines research group, he participated in several oceanographic campaigns of the Centre Oceanogràfic de les Balears (COB-IEO-CSIC) describing the deep-water macroalgal seabeds off the Mallorca and Menorca continental shelf. He is currently working in the COB-IEO-CSIC’s ECOBRED research group within the framework of the PESCAMED CINCO project, linked to the Plan Nacional de Datos Pesqueros del sector Pesquero Español (PNDB).
Sergi Martínez holds degrees in Biology at the University of Girona (UdG, 2014). He completed a Master’s degree in Environmental Impacts (UdG, 2015), with a study of detritic bototms of Balearic Islands, and a Master’s degree in Secondary School at the International University of La Rioja (2017). He’s currently a biology teacher in a secondary school.
Conxi Rodríguez-Prieto is full professor of Botany at the University of Girona (UdG) and curator of the algae section of the Herbarium of the University of Girona (HGI). Her research focuses mainly on taxonomy of red algae, but she works too on ecophysiology and ecology of marine macroalgae.
Acknowledgments
We thank all the scientific staff and the crew participating in the sampling at sea. We thank Marc Verlaque, Kike Ballesteros, Giovanni Furnari and Julio Afonso Carrillo for taxonomic help. The editor and reviewers are thanked for their comments that have clearly helped to improve the manuscript.
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Author contributions: Sergi Joher: data analysis, writing; Sergi Martínez: sampling, processing of samples, writing; Conxi Rodríguez-Prieto: conceived and designed the study, sampling, processing of samples, data analysis, writing.
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Research funding: Surveys at sea in 2012 and 2014 were carried out within the project DRAGONSAL (Caracterización del Ecosistema Bentónico de la Plataforma costera del area comprendida entre Sa Dragonera, Cap Ses Salines y Cala Figuera, Mallorca), co-funded by the Conselleria d’Agricultura, Medi Ambient i Territori de les Illes Balears and the CN Instituto Español de Oceanografía (IEO-CSIC).
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Conflict of interest statement: The authors declare that they have no conflicts of interest regarding this article.
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