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Population Growth

Population Growth

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.

Conservation of Small Populations

Conservation of Small Populations

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...

What is Population Genetics?

What is Population Genetics?

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.

What are Populations and Communities?

What are Populations and Communities?

Conservation of Declining Populations

Conservation of Declining Populations

Conservation of declining population focuses on ways of detecting, diagnosing, and halting a population decline. The approach uses methods to prevent populations from going extinct.

Testing a Claim about Mean: Known Population SD

Testing a Claim about Mean: Known Population SD

A complete procedure of testing the hypothesis about a population mean is explained here.
Estimating a population mean requires the samples to be distributed normally. The data should be collected from the randomly selected samples having no sampling bias. The sample size needed to be higher than 30, and most importantly, the population standard deviation should be already known.
In most realistic situations, the population standard deviation is often unknown, but in rare circumstances, when it...

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Related Experiment Video

Updated: Jan 20, 2026

Population Replacement Strategies for Controlling Vector Populations and the Use of Wolbachia pipientis for Genetic Drive

Population Replacement Strategies for Controlling Vector Populations and the Use of Wolbachia pipientis for Genetic Drive

Published on: July 4, 2007

HDV infection in immigrant populations.

Nicola Coppola^1,2, Loredana Alessio², Lorenzo Onorato¹

¹Department of Mental Health and Public Medicine, Section of Infectious Diseases, University of Campania Luigi Vanvitelli, Naples, Italy.

Journal of Medical Virology

|August 21, 2019

Summary

This summary is machine-generated.

Hepatitis D virus (HDV) infection prevalence in immigrants varies by origin. High endemicity in origin countries and low endemicity in host countries significantly impacts HDV epidemiology due to migration.

Keywords:

HBV/HDV coinfection HDV hepatitis HDV infection HDV prevalence immigrants

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Genotypic Inference of HIV-1 Tropism Using Population-based Sequencing of V3

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Published on: December 27, 2010

Area of Science:

Hepatology
Infectious Diseases
Epidemiology

Background:

Limited data exists on Hepatitis D Virus (HDV) infection in immigrant populations.
Information on virological, phylogenetic, and clinical aspects of HDV in immigrants is scarce.

Purpose of the Study:

To review available information on HDV infection.
To analyze data concerning HDV infection in immigrant populations.
To provide insights for physicians caring for immigrants.

Main Methods:

Review of existing literature on HDV epidemiology.
Analysis of prevalence data based on country of origin.
Assessment of the impact of migratory flows on HDV epidemiology.

Main Results:

HDV prevalence in HBsAg-positive immigrants differs by country of origin.
Prevalence is higher in immigrants from Equatorial Guinea (24.4%) compared to other sub-Saharan African countries (10.3%).
Impact of HDV is high when immigrants from endemic areas move to low-endemicity countries.

Conclusions:

Immigration significantly impacts HDV epidemiology.
The impact is substantial when HDV endemicity is high in the country of origin and low in the host country.
The impact is less pronounced when immigrants move to countries with high or medium endemicity.