Related Experiment Video
Updated: May 29, 2026
05:34
Primordial Germ Cell Transplantation for CRISPR/Cas9-based Leapfrogging in Xenopus
Published on: February 1, 2018
Back from the brink: potential for genetic rescue in a critically endangered tree
A Finger1, C J Kettle, C N Kaiser-Bunbury
1ETH Zürich, Institute of Terrestrial Ecosystems, Ecosystem Management, CH-8092 Zürich, Switzerland. aline.finger@env.ethz.ch
Molecular Ecology
|September 3, 2011
Summary
Rare tropical trees face genetic erosion. Maintaining gene flow and implementing genetic rescue can improve reproductive success and conserve endangered plant populations.
Area of Science:
- Ecology
- Conservation Biology
- Genetics
Background:
- Rare plant species are susceptible to genetic erosion and inbreeding due to small, fragmented populations.
- Habitat fragmentation can isolate populations, exacerbating genetic problems and threatening species viability.
- The critically endangered tropical tree Medusagyne oppositifolia, endemic to Seychelles, exhibits recruitment failure in most of its populations.
Purpose of the Study:
- To investigate the genetic diversity and reproductive processes of Medusagyne oppositifolia populations.
- To determine if genetic issues, such as inbreeding and low gene flow, contribute to recruitment failure.
- To assess the potential of genetic rescue through inter-population crosses to enhance reproductive success.
Main Methods:
- Analysis of genetic diversity using 10 microsatellite loci across four Medusagyne oppositifolia populations.
- Assessment of pollen and seed dispersal distances.
- Controlled cross-pollination experiments between a large and a small population.
Main Results:
- High genetic diversity was observed in most populations, except for the smallest one.
- Significant genetic differentiation and within-population structure were found.
- Inter-population crosses from a large to a small population significantly increased reproductive success compared to within-population crosses.
Conclusions:
- Inbreeding in small, isolated populations likely causes recruitment failure in Medusagyne oppositifolia.
- Maintaining gene flow between populations is crucial, even for species with naturally patchy distributions.
- Genetic and ecological rescue strategies show promise for conserving plant species with limited gene flow and fragmented populations.
Related Concept Videos
01:50Threats to Biodiversity
There have been five major extinction events throughout geological history, resulting in the elimination of biodiversity, followed by a rebound of species that adapted to the new conditions. In the current geological epoch, the Holocene, there is a sixth extinction event in progress. This mass extinction has been attributed to human activities and is thus provisionally called the Anthropocene. In 2019 the human population reached 7.7 billion people and is projected to comprise 10 billion by...
02:07Conservation 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.
02:16Genetics of Speciation
Speciation is the evolutionary process resulting in the formation of new, distinct species—groups of reproductively isolated populations.
01:19Survival Tree
Survival trees are a non-parametric method used in survival analysis to model the relationship between a set of covariates and the time until an event of interest occurs, often referred to as the "time-to-event" or "survival time." This method is particularly useful when dealing with censored data, where the event has not occurred for some individuals by the end of the study period, or when the exact time of the event is unknown.
Building a Survival Tree
Constructing a survival tree begins...
Building a Survival Tree
Constructing a survival tree begins...
02:04Conservation 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 likely to...
01:59Plant Breeding and Biotechnology
Crop cultivation has a long history in human civilization, with records showing the cultivation of cereal plants beginning at around 8000 BC. This early plant breeding was developed primarily to provide a steady supply of food.