scholarly journals Inbreeding depression contributes to the maintenance of habitat segregation between closely related monkeyflower species

Evolution ◽  
2021 ◽  
Vol 75 (4) ◽  
pp. 832-846
Author(s):  
Katherine Toll ◽  
Eric F. LoPresti ◽  
David B. Lowry
Keyword(s):  
Inbreeding Depression ◽  
Habitat Segregation

The SUSPECT SYMPTOMS OF INBREEDING DEPRESSION AND THE HOMOZYGOSITY LEVEL OF FOURTH GENERATION OF SP450T AND FIFTH GENERATION OF DURA DELI OIL PALM SELFING POPULATION

2018 ◽  
Vol 24 (2) ◽  
pp. 55-66
Author(s):  
Rokhana Faizah ◽  
Sri Wening ◽  
Hernawan Yuli Rahmadi ◽  
Abdul Razak Purba
Keyword(s):  
Inbreeding Depression ◽  
Oil Palm ◽  
Recurrent Selection ◽  
Fourth Generation ◽  
Depression Symptoms ◽  
Reciprocal Recurrent Selection ◽  
Chain Reaction ◽  
Fifth Generation ◽  
Polymerase Chain ◽  
Simple Sequence

Inbreeding is a common method used to reproduce candidate mother plant from selected parental lines for commercial seeds in Reciprocal Recurrent Selection (RRS) oil palm breeding program. However this practice may increased homozigosity level of selected population. This study concerned the level of homozygosity of SP540T fourth generations and Dura Deli Dolok Sinumbah fifth generations (3 crosses respectively) and their correlation with inbreeding depression symptoms. Polymerase Chain Reaction-Simple Sequence Repeat (PCR-SSR) with 16 markers developed for oil palm was used to analyze 327 samples. The result shows that the levels of homozigosity of SP540T fourth selfing generation were ranged between 0.44-0.84 or 0.61 in average. While the levels of homozygosity of Dura Deli fifth selfing generations were ranged between 0.60-0.93 or 0.78 in average. The homozygosity level in Dura Deli was 1.27% higher than SP540T populations. Correlation analysis showed that the higher the level of homozygosity, the higher of the inbreeding symptoms 2 observed (R =0.95).

Inbreeding reduces reproductive fitness

2017 ◽  
Author(s):  
Richard Frankham ◽  
Jonathan D. Ballou ◽  
Katherine Ralls ◽  
Mark D. B. Eldridge ◽  
Michele R. Dudash ◽  
...  
Keyword(s):  
Natural Selection ◽  
Inbreeding Depression ◽  
Reproductive Fitness ◽  
Heterozygote Advantage ◽  
Small Populations ◽  
Population Bottlenecks ◽  
Risk Of Extinction ◽  
Survival And Reproduction

The harmful impacts of inbreeding are generally greater in species that naturally outbreed compared to those in inbreeding species, greater in stressful than benign environments, greater for fitness than peripheral traits, and greater for total fitness compared to its individual components. Inbreeding reduces survival and reproduction (i.e., it causes inbreeding depression), and thereby increases the risk of extinction. Inbreeding depression is due to increased homozygosity for harmful alleles and at loci exhibiting heterozygote advantage. Natural selection may remove (purge) the alleles that cause inbreeding depression, especially following inbreeding or population bottlenecks, but it has limited effects in small populations and usually does not completely eliminate inbreeding depression. Inbreeding depression is nearly universal in sexually reproducing organisms that are diploid or have higher ploidies.

scholarly journals Resolving the conundrum of inbreeding depression but no inbreeding avoidance: Estimating sex-specific selection on inbreeding by song sparrows (Melospiza melodia)

Evolution ◽  
2015 ◽  
Vol 69 (11) ◽  
pp. 2846-2861 ◽  
Author(s):  
Jane M. Reid ◽  
Peter Arcese ◽  
Greta Bocedi ◽  
A. Bradley Duthie ◽  
Matthew E. Wolak ◽  
...  
Keyword(s):  
Inbreeding Depression ◽  
Inbreeding Avoidance ◽  
Melospiza Melodia ◽  
Song Sparrows
Sign in / Sign up

Export Citation Format

Share Document