Inbreeding Depression and the Evolution of Dispersal Rates: A Multilocus Model

2005 ◽  
Vol 166 (6) ◽  
pp. 708
Author(s):  
Roze ◽  
Rousset
Keyword(s):  
Inbreeding Depression ◽  
Evolution Of Dispersal ◽  
Multilocus Model

scholarly journals Inbreeding depression drives evolution of dispersal and polyandry

2021 ◽  
Author(s):  
Greta Bocedi
Keyword(s):  
Inbreeding Depression ◽  
Extinction Risk ◽  
Empirical Work ◽  
Evolution Of Dispersal ◽  
Recessive Mutations ◽  
Mean Fitness ◽  
Widespread Phenomenon ◽  
Key Driver ◽  
Dispersal Evolution ◽  
Evolutionary Consequences

AbstractInbreeding depression, defined as the reduction in fitness components of offspring of related individuals compared to offspring of unrelated individuals, is a widespread phenomenon and has profound demographic and evolutionary consequences. It can reduce the mean fitness of a population and increase extinction risk, and it can affect traits evolution. Inbreeding depression is widely hypothesized to be a key driver of the evolution of, among other traits, dispersal (individual movements potentially leading to spatial gene flow) and polyandry (female mating with multiple males within a single reproductive bout), as mechanisms to avoid inbreeding. In turn, both dispersal and polyandry can change the relatedness structure within and among populations, thus affecting opportunity for inbreeding and consequent evolution of inbreeding depression. However, despite this potential major shared driver, and despite the large amount of both theoretical and empirical work, evolution of dispersal and polyandry given inbreeding have been so far studied separately, and thus we still do not know whether and how dispersal and polyandry affect each other’s evolution, and how they may feed-back onto evolution of inbreeding depression itself. Here, using a genetically-explicit individual-based model, which models realistic distributions of selection and dominance coefficients of deleterious recessive mutations underpinning inbreeding depression, I show that: 1) inbreeding depression indeed drives evolution of dispersal and polyandry; 2) there is a negative feedback between dispersal evolution and polyandry evolution, which therefore evolve as alternative inbreeding avoidance strategies; 3) inbreeding depression is mainly shaped by the level of dispersal, while polyandry has a much more limited effect.

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).

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