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  • Books
  • Articles  (3)
  • Zooplankton  (2)
  • GIY-YIG endonuclease  (1)
  • Oxford University Press  (2)
  • Instituto Oceanográfico de la Armada  (1)
  • MDPI Publishing
  • 2005-2009  (3)
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  • Books
  • Articles  (3)
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  • 1
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    Measurements of acoustic scattering from zooplankton and oceanic microstructure using a broadband echosounder (2009)
    Oxford University Press
    Details
    Publication Date: 2022-05-25
    Description: © 2009 The Authors. This article is distributed under the terms of the Creative Commons Attribution Non-Commercial License. The definitive version was published in ICES Journal of Marine Science: Journal du Conseil 67 (2010): 379-394, doi:10.1093/icesjms/fsp242.
    Description: In principle, measurements of high-frequency acoustic scattering from oceanic microstructure and zooplankton across a broad range of frequencies can reduce the ambiguities typically associated with the interpretation of acoustic scattering at a single frequency or a limited number of discrete narrowband frequencies. With this motivation, a high-frequency broadband scattering system has been developed for investigating zooplankton and microstructure, involving custom modifications of a commercially available system, with almost complete acoustic coverage spanning the frequency range 150–600 kHz. This frequency range spans the Rayleigh-to-geometric scattering transition for some zooplankton, as well as the diffusive roll-off in the spectrum for scattering from turbulent temperature microstructure. The system has been used to measure scattering from zooplankton and microstructure in regions of non-linear internal waves. The broadband capabilities of the system provide a continuous frequency response of the scattering over a wide frequency band, and improved range resolution and signal-to-noise ratios through pulse-compression signal-processing techniques. System specifications and calibration procedures are outlined and the system performance is assessed. The results point to the utility of high-frequency broadband scattering techniques in the detection, classification, and under certain circumstances, quantification of zooplankton and microstructure.
    Description: The work was supported by the US Office of Naval Research (Grant # N000140210359).
    Keywords: Broadband acoustic scattering ; Internal waves ; Oceanic microstructure ; Zooplankton
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 2
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    Distribution and phylogeny of Penelope-like elements in eukaryotes (2009)
    Oxford University Press
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Society of Systematic Biologists, 2006. This article is posted here by permission of Oxford University Press for personal use, not for redistribution. The definitive version was published in Systematic Biology 55 (2006): 875-885, doi:10.1080/10635150601077683.
    Description: Penelope-like elements (PLEs) are a relatively little studied class of eukaryotic retroelements, distinguished by the presence of the GIY-YIG endonuclease domain, the ability of some representatives to retain introns, and the similarity of PLE-encoded reverse transcriptases to telomerases. Although these retrotransposons are abundant in many animal genomes, the reverse transcriptase moiety can also be found in several protists, fungi, and plants, indicating its ancient origin. A comprehensive phylogenetic analysis of PLEs was conducted, based on extended sequence alignments and a considerably expanded data set. PLEs exhibit the pattern of evolution similar to that of non-LTR retrotransposons, which form deep-branching clades dating back to the Precambrian era. However, PLEs seem to have experienced a much higher degree of lineage losses than non-LTR retrotransposons. It is suggested that PLEs and non-LTR retrotransposons are included into a larger eTPRT (eukaryotic target-primed) group of retroelements, characterized by 5' truncation, variable target-site duplication, and the potential of the 3' end to participate in formation of non-autonomous derivatives.
    Description: This work was supported by the U.S. National Science Foundation (MCB 0614142).
    Keywords: Penelope-like elements ; Retrotransposons ; Reverse transcriptase ; GIY-YIG endonuclease
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 3
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    Relación fitoplancton-zooplancton en el Pacífico Ecuatorial (Ecuador), durante septiembre 2001 (2008)
    Instituto Oceanográfico de la Armada
    Details
    Publication Date: 2021-05-19
    Description: El presente trabajo es una contribución al conocimiento de la bio-oceanografía del mar ecuatoriano, forma parte del Proyecto de Monitoreo de las condiciones oceanográficas en el mar ecuatoriano y su relación con eventos de El Niño, realizadas en el B/I ORION del Instituto Oceanográfico de la Armada (INOCAR) en septiembre-octubre 2001, como un aporte a la comunidad.
    Description: The present research corresponds to the cruise carried out by the Oceanographic Institute of the Ecuadorian Navy in september 2001, between 89°W - 81°1W and 1°N - 3°3S. The distribution of plankton populations associated with upwelling areas of the coastal brunch of the Humboldt Current in the Gulf of Guayaquil, and toward the Galapagos, upwelling of the Cromwell Current, forming patches in the central region and toward the Gulf of Guayaquil, is described. Increased phytoplankton (diatoms) production was found south of the equatorial region, coincident with the presence of dinoflagellates species of warm-oceanic waters allowing slight mixed areas. The higher abundance of zooplankton (copepods) were found to the east of the Galapagos Islands, decreasing toward the continent. These bio-geographic conditions point to higher productivity areas to the south and lower productivity areas to the north of the studied area, characterized by the position of the Equatorial Front. A patch the high biological productivity was also evidenced in the oceanic region, atypical condition associated to the global cooling of the La Niña event, and/or advances of upwelling waters toward the continent, processes of great importance for the pelagic resources of Ecuador.
    Description: Incluye ref.bibl., grafs.
    Description: Published
    Keywords: Phytoplankton ; Zooplankton ; Distribution ; Biogeography ; Chlorophylls ; Phytoplankton ; Zooplankton ; Biogeography ; Abundance ; Equatorial upwelling ; El Nino phenomena ; Distribution ; Chlorophylls
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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