Caracterización de Macroalgas presentes en los parches coralinos de la isla Santa Cruz, Galápagos

Abstract

CONDITION FOR PUBLICATION OF PROJECT. Coral patches in the Galápagos Islands are highly biodiverse ecosystems but face increasing threats from anthropogenic and natural factors that favor the proliferation of macroalgae, compromising coral survival. This study aims to characterize the composition and abundance of macroalgae associated with coral patches in Santa Cruz Island, providing valuable information for the conservation of coral reef ecosystems in the Galápagos. Sampling was conducted at four sites: Bahía Conway, Bahía Borrero, Bahía La Academia, and Punta Estrada. Transects and quadrats were used to assess benthic cover, along with photographic records and sample collection for taxonomic identification using morphological keys. A total of 30 macroalgal taxa were identified, with filamentous genera such as Cladophora, Ceramium, and Polysiphonia dominating the assemblages. Results revealed high “turf” algal cover and low coral presence at most sites, with Bahía Conway showing the highest proportion of live coral. Moreover, “turf” macroalgae exhibited a negative effect on coral health, whereas crustose coralline algae had a positive impact. These findings provide key insights into local benthic dynamics and support management and conservation strategies for the Galápagos Marine Reserve. Keywords: benthic cover, algal-coral interaction, hermatypic corals, coral reefs, macroalgae