Please use this identifier to cite or link to this item:
Title: Some like it fat: Comparative ultraestructure of the embryo in two demo sponges of the genus Mycale (Order Poecilosclerida): Mycale acerata from Antarctica and Mycale laevis from the Caribbean
Author: Riesgo Gil, Ana
Taboada, Sergi
Sánchez Vila, Laura.
Solà Peracaula, Joan
Bertrán, Andrea.
Ávila Escartín, Conxita
Keywords: Embriologia
Issue Date: 18-Mar-2015
Publisher: Public Library of Science (PLoS)
Abstract: During embryogenesis, organisms with lecithotrophic indirect development usually accu- mulate large quantities of energetic reserves in the form of yolk that are necessary for larval survival. Since all sponges have lecithotrophic development, yolk formation is an ineludible step of their embryogenesis. Sponge yolk platelets have a wide range of morphological forms, from entirely lipid or protein platelets to a combined platelet showing both lipids and proteins and even glycogen. So far, there are no comparative studies on the nature and content of yolk in congeneric species of sponges inhabiting contrasting environments, which could have putative effects on the larval adaptation to environmental conditions. Here, we have taken advantage of the worldwide distribution of the sponge genus Mycale, in order to compare the embryogenesis and yolk formation in two species inhabiting con- trasting latitudinal areas: M. acerata from Antarctic waters and M. laevis from the Caribbean. We have compared their brooded embryos and larvae using scanning and transmission electron microscopy, and calculated their energetic signatures based on the nature of their yolk. While the general morphological feature of embryos and larvae of both species were very similar, the main difference resided in the yolk nature. The Antarctic species, M. acer- ata, showed exclusively lipid yolk, whereas the Caribbean species, M. laevis, showed com- bined platelets of lipids and proteins and less frequently protein yolk platelets. The larvae of M. acerata were estimated to possess a two-fold energetic signature compared to that of M. laevis, which may have important ecological implications for their survival and for maintain- ing large population densities in the cold waters of the Southern Ocean.
Note: Reproducció del document publicat a:
It is part of: PLoS One, 2015, vol. 10, num. 3, p. e0118805
Related resource:
ISSN: 1932-6203
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

Files in This Item:
File Description SizeFormat 
647850.pdf12.11 MBAdobe PDFView/Open

This item is licensed under a Creative Commons License Creative Commons