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Videos de Conceptos Relacionados

Types of Selection01:46

Types of Selection

Natural selection influences the frequencies of particular alleles and phenotypes within populations in several different ways. Primarily, natural selection can be directional, stabilizing, or disruptive. Directional selection favors one extreme trait and shifts the population towards that phenotype while selecting against individuals displaying alternate traits. Stabilizing selection favors an intermediate trait with a narrow range of variation. Deviation from the optimal phenotype towards an...
Predator-Prey Interactions02:39

Predator-Prey Interactions

Predators consume prey for energy. Predators that acquire prey and prey that avoid predation both increase their chances of survival and reproduction (i.e., fitness). Routine predator-prey interactions elicit mutual adaptations that improve predator offenses, such as claws, teeth, and speed, as well as prey defenses, including crypsis, aposematism, and mimicry. Thus, predator-prey interactions resemble an evolutionary arms race.Although predation is commonly associated with carnivory, for...
Limits to Natural Selection01:38

Limits to Natural Selection

Organisms that are well-adapted to their environment are more likely to survive and reproduce. However, natural selection does not lead to perfectly adapted organisms. Several factors constrain natural selection.For one, natural selection can only act upon existing genetic variation. Hypothetically, redtusks may enhance elephant survival by deterring ivory-seeking poachers. However, if there are no gene variants—or alleles—for redtusks, natural selection cannot increase the prevalence of...
Hybrid Zones02:29

Hybrid Zones

Hybrid zones are narrow regions where two closely related species interact, mate, and produce hybrids. Relative to either parent species, hybrids may possess distinct phenotypic or genetic differences that impact their survival and reproductive success. The genetic variances introduced by hybridization influence species diversity and speciation processes within the hybrid zone.Gene flow and natural selection are evolutionary mechanisms that shape the outcome of a hybrid zone. Gene flow...
Diversity of Protists II01:27

Diversity of Protists II

Alveolates are a group of organisms recognized by the presence of alveoli, which are cytoplasmic sacs located beneath the cell membrane. While their function remains uncertain, alveoli may help regulate water balance by controlling how much water enters and leaves the cell. In dinoflagellates, these structures may serve as armor plates. There are three major types of alveolates: ciliates, which move using cilia; dinoflagellates, which use flagella for movement; and apicomplexans, which are...
Diversity of Protists III01:27

Diversity of Protists III

Rhizaria are a diverse group of unicellular protists characterized by their threadlike cytoplasmic extensions known as pseudopodia. These structures aid in both locomotion and feeding, giving Rhizaria an amoeboid appearance. Their amoeboid morphology once led to taxonomic confusion, but molecular phylogenetics has clarified their evolutionary placement and emphasized their shared use of pseudopodia despite divergent lineages.This clade comprises diverse lineages such as Chlorarachniophyta,...

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Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

Selectivity in phagocytosis and persistence of symbiotic algae in the scyphistoma stage of the jellyfish Cassiopeia xamachana.

Proceedings of the Royal Society of London. Series B, Biological sciences·2012
Same author

Cellular events in the reestablishment of a symbiosis between a marine dinoflagellate and a coelenterate.

Cell and tissue research·2012
Same author

Ultraviolet sunscreens in dinoflagellates.

Protist·2001
Same author

Morphology of the symbiosis between Corculum cardissa (Mollusca: Bivalvia) and Symbiodinium corculorum (Dinophyceae).

The Biological bulletin·2001
Same author

Biogeography of two species of Symbiodinium (Freudenthal) inhabiting the intertidal sea anemone Anthopleura elegantissima (Brandt).

The Biological bulletin·2000
Same author

Calcification rates in corals.

Science (New York, N.Y.)·1996

Video Experimental Relacionado

Updated: Jun 24, 2026

Cultivation of the Marine Pelagic Tunicate Dolioletta gegenbauri (Uljanin 1884) for Experimental Studies
09:39

Cultivation of the Marine Pelagic Tunicate Dolioletta gegenbauri (Uljanin 1884) for Experimental Studies

Published on: August 9, 2019

La especiación y los dinoflagelados simbióticos.

R J Blank, R K Trench

    Science (New York, N.Y.)
    |August 16, 1985
    PubMed
    Resumen

    Los cromosomas en dinoflagelados simbióticos Symbiodinium microadriaticum muestran variaciones significativas en número y volumen. Estas diferencias sugieren especies distintas en lugar de variaciones dentro de una sola especie.

    Área de la Ciencia:

    • Biología marina Biología marina.
    • Microbiología Microbiología.
    • Genética La genética.

    Sus antecedentes:

    • Symbiodinium microadriaticum es un dinoflagelado simbiótico crucial para la salud de los arrecifes de coral.
    • Estas algas forman asociaciones vitales con los invertebrados marinos como los corales y las almejas gigantes.
    • Comprender la diversidad de Symbiodinium es clave para la investigación de los ecosistemas marinos.

    Objetivo del estudio:

    • Para investigar la morfología nuclear de las diferentes cepas de Symbiodinium microadriaticum.
    • Para determinar si las variaciones observadas representan diferentes especies o niveles de ploidia.
    • Contribuir a la aclaración taxonómica del Symbiodinium.

    Principales métodos:

    • Reconstrucción tridimensional de los núcleos de las algas.

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  • Análisis morfométrico detallado del número y volumen de cromosomas.
  • Análisis comparativo a través de cuatro cepas distintas de Symbiodinium.

    • Principales resultados:

    • Se observaron diferencias significativas en el número de cromosomas entre las cepas.
    • Se identificaron variaciones marcadas en el volumen cromosómico.
    • Las diferencias nucleares observadas fueron inconsistentes con los diferentes estados de ploidia.

    Conclusiones:

    • Los datos morfométricos sugieren fuertemente que las cepas analizadas representan especies distintas.
    • Este hallazgo tiene implicaciones para la taxonomía y la comprensión de la diversidad de Symbiodinium.
    • Se necesitan más investigaciones para confirmar el estado de las especies y explorar los roles ecológicos.