Moluscos e invertebrados marinos más comunes en cinco islas del Archipiélago de Galápagos, durante el primer crucero insular del B/I Orión

Abstract

Este trabajo es el resultado de la macrofauna encontrada, que de ninguna manera refleja la totalidad de su biodiversidad, solo es el inicio de futuras investigaciones que se necesitan realizar en nuestro país y constituye una "guía" preliminar de orientación que no incluye la meiofauna y la microfauna las que son motivo de futuras investigaciones.

Eleven sediments samples were obtained from 3 bays and two ports that were plot of five islands of the Galapagos Islands (Fig.1bb), they are: San Cristobal (Bahia Naufragio), Floreana(Pto. Velasco Ibarra), Isabela (Pto. General Villamil), Genovesa (Bahia Darwin), and Santa Cruz ( Bahía Academica), (Fig.2bb). There were 109 organisms (Table 1), which are represented for 8 phylum: Porifera, Coelenterata, Annelida (Polichaeta), Mollusca (Bivalves, Gastropod and Poliplacofora), Arthoropod (Pycnogónida, Crustacean), Briozoa. Echinodermata (Holothuroidea, Equinoidea) and Chordate (Hemichordata, CEphalochordata). In the interdinal zone of the Isabela island there were 12 species of invertebrates of which the gastropod Thais melones and the marine cucumber Holothuaria theeli were the most abundace. It was observed that the organic or biogenic sediments between 5 to 25 mt of depth, are compound for more less the 90% of broken shell of mollusks and there is a low abundace and diversity of organisms. The polichaetes are the most dominants, although, on the submerge rock or stone are the major biodiversity of the marine invertebrates. In the Velasco Ibarra Bay, from Floreana island, between 5 to 10 mt depth on a small rock obtained with a Van Veen dredge a great biodiversity of species were found.