Video Experimental Relacionado

Updated: May 6, 2026

Mass Isolation and In Vitro Cultivation of Intramolluscan Stages of the Human Blood Fluke Schistosoma Mansoni

Mass Isolation and In Vitro Cultivation of Intramolluscan Stages of the Human Blood Fluke Schistosoma Mansoni

Published on: January 14, 2018

Evolución de los complejos ciclos de vida de los parásitos de los helmintos

Geoff A Parker¹, Jimmy C Chubb, Michael A Ball

¹Population and Evolutionary Biology Research Group, School of Biological Sciences, University of Liverpool, Liverpool L69 7ZB, UK. gap@liverpool.ac.uk

|October 3, 2003

Resumen

Los complejos ciclos de vida en los helmintos parásitos evolucionan a través de dos vías principales: incorporación ascendente de un nuevo huésped depredador o incorporación descendente de un nuevo huésped intermedio. Estos procesos optimizan la supervivencia y transmisión de los parásitos.

Área de la Ciencia:

Parasitología Parasitología.
Biología evolutiva Biología evolutiva.
Ecología Ecología Ecología.

Sus antecedentes:

La evolución de los complejos ciclos de vida en los sistemas huésped-parásito es poco conocida.
Los helmintos a menudo exhiben ciclos de vida complejos que involucran a múltiples huéspedes.

Objetivo del estudio:

Proponer dos procesos evolutivos distintos para los complejos ciclos de vida de los helmintos sin etapas infecciosas penetrantes.
Para explicar cómo los nuevos huéspedes se incorporan a los ciclos de vida de los parásitos existentes.

Principales métodos:

Modelado teórico de las interacciones huésped-parásito.
Análisis de las estrategias de incorporación de huéspedes en los ciclos de vida de los helmintos.

Principales resultados:

La "incorporación ascendente" implica agregar un depredador como un nuevo huésped definitivo, aumentando el tamaño y la fecundidad del parásito.
La "incorporación descendente" agrega un nuevo huésped intermedio a un nivel trófico inferior, reduciendo la mortalidad y ayudando a la transmisión.
Se supone que estos procesos también se aplican a los helmintos con etapas infecciosas penetrantes.

Conclusiones:

Los complejos ciclos de vida de los helmintos evolucionan a través de distintos mecanismos de incorporación del huésped "hacia arriba" y "hacia abajo".
Estas estrategias mejoran la supervivencia, la reproducción y la eficiencia de transmisión de los parásitos.
El marco propuesto ofrece información sobre la diversificación de las historias de vida de parásitos.

Más Videos Relacionados

Ultrastructural Expansion Microscopy in Three In Vitro Life Cycle Stages of Trypanosoma cruzi

Ultrastructural Expansion Microscopy in Three In Vitro Life Cycle Stages of Trypanosoma cruzi

Published on: May 12, 2023

Exploring Life History Choices: Using Temperature and Substrate Type as Interacting Factors for Blowfly Larval and Female Preferences

Exploring Life History Choices: Using Temperature and Substrate Type as Interacting Factors for Blowfly Larval and Female Preferences

Published on: November 17, 2023

Videos de Conceptos Relacionados

Retrovirus Life Cycles

Retrovirus Life Cycles

Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...

Life Histories

Life Histories

Symbiosis

Symbiosis

Symbiotic relationships are long-term, close interactions between individuals of different species that affect the distribution and abundance of those species. When a relationship is beneficial to both species, this is called mutualism. When the relationship is beneficial to one species but neither beneficial nor harmful to the other species, this is called commensalism. When one organism is harmed to benefit another, the relationship is known as parasitism. These types of relationships often...

Diversity of Protists I

Diversity of Protists I

Excavata is a diverse group of protists that includes both chemoorganotrophic and phototrophic species, with some thriving in anaerobic environments. Among the key groups within Excavata are diplomonads and parabasalids, which are flagellated protists that lack mitochondria and chloroplasts. These microorganisms typically inhabit anoxic environments, such as the intestines of animals, where they exist either symbiotically or as parasites, relying on fermentation for energy production. Some...

Diversity of Protists II

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...

Microbial Interactions: Parasitism

Microbial Interactions: Parasitism

Parasitism is a form of microbial interaction in which parasitic microbes exploit a host organism for nutrients and shelter, often at the host's expense. Unlike mutualistic relationships, where both organisms benefit, parasitism benefits only the parasite and harms the host.Classification of ParasitesMicrobial parasites are broadly classified based on their location relative to the host.Ectoparasites remain on the host’s surface, such as the skin or outer tissues, drawing nutrients...