Ontogenetic allometry of the bluemouth, <Emphasis Type="Italic">Helicolenus dactylopterus dactylopterus</Emphasis> (Teleostei: Scorpaenidae), in the Northeast Atlantic and Mediterranean based on geometric morphometrics |
| |
Authors: | Rebeca Rodríguez-Mendoza Marta Muñoz Fran Saborido-Rey |
| |
Institution: | 1.LMGE, Laboratoire Microorganismes: Génome & Environnement, UMR CNRS 6023,Université Blaise Pascal,Aubière Cedex,France;2.School of Biological Sciences A12,University of Sydney,Sydney,Australia;3.Biology Department,The University of Alabama,Tuscaloosa,USA |
| |
Abstract: | Since the emergence of the ‘microbial loop’ concept, heterotrophic flagellates have received particular attention as grazers
in aquatic ecosystems. These microbes have historically been regarded incorrectly as a homogeneous group of bacterivorous
protists in aquatic systems. More recently, environmental rDNA surveys of small heterotrophic flagellates in the pelagic zone
of freshwater ecosystems have provided new insights. (i) The dominant phyla found by molecular studies differed significantly
from those known from morphological studies with the light microscope, (ii) the retrieved phylotypes generally belong to well-established
eukaryotic clades, but there is a very large diversity within these clades and (iii) a substantial part of the retrieved sequences
cannot be assigned to bacterivorous but can be assigned instead to parasitic and saprophytic organisms, such as zoosporic
true fungi (chytrids), fungus-like organisms (stramenopiles), or virulent alveolate parasites (Perkinsozoa and Amoebophrya sp.). All these microorganisms are able to produce small zoospores to assure dispersal in water during their life-cycles.
Based on the existing literature on true fungi and fungus-like organisms, and on the more recently published eukaryotic rDNA
environmental studies and morphological observations, we conclude that previously overlooked microbial diversity and related
ecological potentials require intensive investigation (i) for an improved understanding of the roles of heterotrophic flagellates
in pelagic ecosystems and (ii) to properly integrate the concept of ‘the microbial loop’ into modern pelagic microbial ecology. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|