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

Global Climate Change01:50

Global Climate Change

28.9K
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
28.9K
Predicting Molecular Geometry02:27

Predicting Molecular Geometry

45.9K
VSEPR Theory for Determination of Electron Pair Geometries
45.9K
Conservation of Small Populations02:04

Conservation of Small Populations

17.4K
Small population sizes put a species at extreme risk of extinction due to a lack of variation, and a consequent decrease in adaptability. This weakens the chances of survival under pressures such as climate change, competition from other species, or new diseases. Large populations are more likely to survive pressures such as these, as such populations are more likely to harbor individuals that have genetic variants that are adaptive under new stresses. Small populations are much less...
17.4K
What is Population Genetics?01:25

What is Population Genetics?

64.8K
A population is composed of members of the same species that simultaneously live and interact in the same area. When individuals in a population breed, they pass down their genes to their offspring. Many of these genes are polymorphic, meaning that they occur in multiple variants. Such variations of a gene are referred to as alleles. The collective set of all the alleles within a population is known as the gene pool.
64.8K
Population Growth00:57

Population Growth

28.6K
Population size is dynamic, increasing with birth rates and immigration, and decreasing with death rates and emigration. In ideal conditions with unlimited resources, populations can increase exponentially, which plots as a J-shaped growth rate curve of population size against time. This type of curve is characteristic of newly-introduced invasive species, or populations that have suffered catastrophic declines and are rebounding.
28.6K
What are Populations and Communities?00:30

What are Populations and Communities?

37.9K
Overview
37.9K

También podría leer

Artículos Relacionados

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

Ordenar por
Same author

An Assessment of Allelic and SNP Bias in a Genome-Wide SNP Enrichment Kit for Killer Whales.

Ecology and evolution·2026
Same author

Current-following behaviour during maiden foraging trips predicts survival in naive marine mammals.

Movement ecology·2026
Same author

Mercury binding to selenoproteins and age-related depletion of bioavailable selenium in long-finned pilot whales.

The Science of the total environment·2026
Same author

Neutral lipid fatty acid composition in the epidermis and blubber of long-finned pilot whales (<i>Globicephala melas</i>) in the Northeast Atlantic confirms tissue-specific stratification.

Marine biology·2026
Same author

A Holistic Approach to Chemical Mixtures in the Canadian Environment.

Environmental science & technology·2026
Same author

The genome sequence of the Atlantic white-sided dolphin, <i>Leucopleurus acutus</i> (Gray, 1828) (Artiodactyla: Delphinidae).

Wellcome open research·2026

Video Experimental Relacionado

Updated: Feb 4, 2026

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling
20:36

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling

Published on: July 4, 2007

9.2K

Prediciendo el colapso de la población mundial de orcas debido a la contaminación por PCB

Jean-Pierre Desforges1, Ailsa Hall2, Bernie McConnell3

  • 1Department of Bioscience, Arctic Research Centre, Aarhus University, Frederiksborgvej 399, P.O. Box 358, 4000 Roskilde, Denmark. jpd@bios.au.dk rdi@bios.au.dk ajh7@st-andrews.ac.uk.

Science (New York, N.Y.)
|September 29, 2018
PubMed
Resumen

Los bifenilos policlorados (PCB) amenazan a más de la mitad de las poblaciones de ballenas asesinas del mundo debido a sus efectos reproductivos e inmunológicos. Estos contaminantes persistentes representan un riesgo significativo de colapso de la población, especialmente cerca de las zonas industriales.

Más Videos Relacionados

Laboratory Estimation of Net Trophic Transfer Efficiencies of PCB Congeners to Lake Trout Salvelinus namaycush from Its Prey
12:24

Laboratory Estimation of Net Trophic Transfer Efficiencies of PCB Congeners to Lake Trout Salvelinus namaycush from Its Prey

Published on: August 29, 2014

11.4K
Visualizing Field Data Collection Procedures of Exposure and Biomarker Assessments for the Household Air Pollution Intervention Network Trial in India
09:33

Visualizing Field Data Collection Procedures of Exposure and Biomarker Assessments for the Household Air Pollution Intervention Network Trial in India

Published on: December 23, 2022

3.0K

Videos de Experimentos Relacionados

Last Updated: Feb 4, 2026

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling
20:36

Predicting the Effectiveness of Population Replacement Strategy Using Mathematical Modeling

Published on: July 4, 2007

9.2K
Laboratory Estimation of Net Trophic Transfer Efficiencies of PCB Congeners to Lake Trout Salvelinus namaycush from Its Prey
12:24

Laboratory Estimation of Net Trophic Transfer Efficiencies of PCB Congeners to Lake Trout Salvelinus namaycush from Its Prey

Published on: August 29, 2014

11.4K
Visualizing Field Data Collection Procedures of Exposure and Biomarker Assessments for the Household Air Pollution Intervention Network Trial in India
09:33

Visualizing Field Data Collection Procedures of Exposure and Biomarker Assessments for the Household Air Pollution Intervention Network Trial in India

Published on: December 23, 2022

3.0K

Área de la Ciencia:

  • Toxicología en mamíferos marinos
  • Contaminantes del medio ambiente
  • Análisis de la viabilidad de la población

Sus antecedentes:

  • Las ballenas asesinas (Orcinus orca) muestran altos niveles de contaminación por policloruro de bifenilo (PCB) en todo el mundo.
  • Existen preocupaciones con respecto a los impactos sanitarios de los contaminantes orgánicos persistentes en las poblaciones de mamíferos marinos.
  • Los PCB son conocidos como disruptores endocrinos e inmunotoxicantes.

Objetivo del estudio:

  • Evaluar la viabilidad a largo plazo de las poblaciones de orcas bajo los niveles actuales de exposición a los PCB.
  • Identificar las poblaciones con mayor riesgo de efectos mediados por los PCB.
  • Para resaltar la amenaza persistente de los PCB para los ecosistemas marinos.

Principales métodos:

  • Utilizó un marco de modelo basado en el individuo.
  • Se han incorporado los datos disponibles a nivel mundial sobre las concentraciones de PCB en los tejidos de las orcas.
  • Efectos modelados mediados por PCB en la reproducción y la función inmune.

Principales resultados:

  • Más del 50% de las poblaciones mundiales de orcas enfrentan amenazas a la viabilidad a largo plazo por los PCB.
  • Las poblaciones cercanas a las regiones industrializadas y aquellas con altos niveles tróficos corren un alto riesgo de colapso.
  • La contaminación por PCB representa una amenaza persistente a pesar de las prohibiciones mundiales promulgadas hace más de 30 años.

Conclusiones:

  • Las exposiciones actuales a los PCB ponen en peligro la supervivencia a largo plazo de numerosas poblaciones de orcas.
  • Se necesitan estrategias de conservación urgentes para mitigar los impactos de los contaminantes químicos persistentes.
  • La persistencia de los PCB pone de relieve la necesidad de seguir controlando y gestionando los contaminantes heredados.