Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Parental Care00:55

Parental Care

11.7K
Many animals exhibit parental care behavior, including feeding, grooming, and protecting young offspring. Parental care is universal in mammals and birds, which often have young that are born relatively helpless. Several species of insects and fish, as well as some amphibians, also care for their young.
11.7K
Types of Genetic Transfer Between Organisms02:18

Types of Genetic Transfer Between Organisms

24.8K
Genetic transfer occurs when genetic information is passed from one organism to another. It occurs via two mechanisms: vertical gene transfer and horizontal gene transfer. Vertical gene transfer occurs when genetic information is transferred from one generation to the next, which happens much more frequently than horizontal gene transfer. Both sexual and asexual reproduction are forms of vertical gene transfer, where one or more organisms pass some or all of their genome onto their progeny.
24.8K
Diversity of Protists I01:15

Diversity of Protists I

2.3K
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...
2.3K
Diversity of Protists II01:27

Diversity of Protists II

2.3K
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...
2.3K
Diversity of Protists III01:27

Diversity of Protists III

2.1K
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,...
2.1K
Diversity of Protists IV01:27

Diversity of Protists IV

2.1K
Amoebozoa represent a diverse group of terrestrial and aquatic protists that utilize lobe-shaped pseudopodia for locomotion and feeding. This characteristic differentiates them from the Rhizaria, which possess threadlike pseudopodia. The primary classifications within Amoebozoa include gymnamoebas, entamoebas, and the plasmodial and cellular slime molds. Phylogenetic evidence indicates that Amoebozoa diverged from a lineage that ultimately gave rise to fungi and animals.Gymnamoebas and...
2.1K

También podría leer

Artículos Relacionados

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

Ordenar por
Same author

Indirect genomic effects shape cancer risk across species.

bioRxiv : the preprint server for biology·2026
Same author

The Vertebrate Genomes Project Phase I: A global reference genome resource.

bioRxiv : the preprint server for biology·2026
Same author

Competing models of hominin body size evolution.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same author

Bipedalism and brain expansion explain human handedness.

PLoS biology·2026
Same author

Faster speciating cacti have faster evolving flowers.

Biology letters·2026
Same author

CactEcoDB: Trait, spatial, environmental, phylogenetic and diversification data for the cactus family.

Scientific data·2026

Video Experimental Relacionado

Updated: May 2, 2026

Milk Collection Methods for Mice and Reeves' Muntjac Deer
07:34

Milk Collection Methods for Mice and Reeves' Muntjac Deer

Published on: July 19, 2014

19.8K

Múltiples rutas hacia la diversidad de mamíferos.

Chris Venditti1, Andrew Meade, Mark Pagel

  • 1Department of Biological Sciences, University of Hull, Hull HU6 7RX, UK. c.venditti@hull.ac.uk

Nature
|October 21, 2011
PubMed
Resumen

La evolución de los mamíferos muestra que las especies no siempre llenan nichos ecológicos gradualmente. En cambio, las ráfagas rápidas de aumento de la tasa evolutiva, seguidas de la estabilización, dan forma a la diversidad de los mamíferos.

Más Videos Relacionados

Intranasal Immunization and Milk Collection in Studies of Maternal Immunization in New Zealand White Rabbits Oryctolagus cuniculus
13:00

Intranasal Immunization and Milk Collection in Studies of Maternal Immunization in New Zealand White Rabbits Oryctolagus cuniculus

Published on: July 31, 2021

3.3K
An Efficient Single—Person Technique for Milk Sampling from Laboratory Mice
04:56

An Efficient Single—Person Technique for Milk Sampling from Laboratory Mice

Published on: March 28, 2025

1.9K

Videos de Experimentos Relacionados

Last Updated: May 2, 2026

Milk Collection Methods for Mice and Reeves' Muntjac Deer
07:34

Milk Collection Methods for Mice and Reeves' Muntjac Deer

Published on: July 19, 2014

19.8K
Intranasal Immunization and Milk Collection in Studies of Maternal Immunization in New Zealand White Rabbits Oryctolagus cuniculus
13:00

Intranasal Immunization and Milk Collection in Studies of Maternal Immunization in New Zealand White Rabbits Oryctolagus cuniculus

Published on: July 31, 2021

3.3K
An Efficient Single—Person Technique for Milk Sampling from Laboratory Mice
04:56

An Efficient Single—Person Technique for Milk Sampling from Laboratory Mice

Published on: March 28, 2025

1.9K

Área de la Ciencia:

  • Biología evolutiva Biología evolutiva.
  • Paleontología Paleontología.
  • Radiación para mamíferos.

Sus antecedentes:

  • La teoría evolutiva tradicional postula una divergencia rápida temprana seguida de un ajuste fino lento.
  • Este modelo sugiere que las especies llenan gradualmente nichos ecológicos.
  • Investigaciones recientes desafían esta suposición de larga data.

Objetivo del estudio:

  • Para investigar los cambios temporales en las tasas evolutivas a través de la diversificación de los mamíferos.
  • Para poner a prueba las teorías establecidas de la divergencia de especies y el llenado de nichos.
  • Para analizar la relación entre la diversificación morfológica y la especiación.

Principales métodos:

  • Aplicación de métodos estadísticos para detectar cambios en las tasas evolutivas.
  • Análisis de una filogenia integral de mamíferos.
  • La inclusión de datos de tamaño corporal para 3.185 especies existentes.

Principales resultados:

  • La mayoría de las especies de mamíferos no muestran un aumento sostenido en las tasas evolutivas.
  • Un subconjunto experimentó aumentos explosivos y de corta duración de las tasas (10 a 52 veces) que precedieron a la diversificación.
  • Otras especies exhibieron aumentos o disminuciones sostenidas de la tasa.
  • La diversificación morfológica se desacopla de la especiación.

Conclusiones:

  • Los nichos ecológicos no parecen llenarse de manera predecible.
  • La diversidad morfológica surge a través de diversos procesos, tasas y tiempos.
  • La diversificación evolutiva es más flexible de lo que se suponía anteriormente.