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Statements

Subject Item
n2:RIV%2F67985904%3A_____%2F14%3A00428029%21RIV15-GA0-67985904
rdf:type
skos:Concept n10:Vysledek
dcterms:description
Phylogenetic studies typically demonstrate lower evolutionary ages of clones, relative to their sexual ancestors. This has often been attributed to heightened extinction risk of asexual organisms. We previously criticized such interpretations and demonstrated that the life span of clones is ultimately limited by neutral drift depending on the rate at which new clones are spawned into an asexual community of a finite size. Therefore, it is important to investigate whether the natural rates of such influxes are sufficiently high to account for the relative ephemerality of clones without assuming their increased extinction rate. I applied the neutral clonal turnover model to phylogenies of polyploid asexual ferns and simulated the coalescent trees over a wide range of demographic structures and sampling schemes. On parameterizing the model with biologically relevant estimates of population sizes and plant polyploidization rates, simulated clonal assemblages appeared younger than their sexual counterparts even in the absence of selection against clones. Therefore, differences observed between the ages of sexual and clonal lineages may be explained by the neutral clonal turnover. Researchers should consider the possibility that natural clones may get lost by neutral drift before their fate could eventually be affected by any long-term constraints of asexuality. Phylogenetic studies typically demonstrate lower evolutionary ages of clones, relative to their sexual ancestors. This has often been attributed to heightened extinction risk of asexual organisms. We previously criticized such interpretations and demonstrated that the life span of clones is ultimately limited by neutral drift depending on the rate at which new clones are spawned into an asexual community of a finite size. Therefore, it is important to investigate whether the natural rates of such influxes are sufficiently high to account for the relative ephemerality of clones without assuming their increased extinction rate. I applied the neutral clonal turnover model to phylogenies of polyploid asexual ferns and simulated the coalescent trees over a wide range of demographic structures and sampling schemes. On parameterizing the model with biologically relevant estimates of population sizes and plant polyploidization rates, simulated clonal assemblages appeared younger than their sexual counterparts even in the absence of selection against clones. Therefore, differences observed between the ages of sexual and clonal lineages may be explained by the neutral clonal turnover. Researchers should consider the possibility that natural clones may get lost by neutral drift before their fate could eventually be affected by any long-term constraints of asexuality.
dcterms:title
Let us not be unfair to asexuals: their ephemerality may be explained by neutral models without invoking any evolutionary constraints of asexuality Let us not be unfair to asexuals: their ephemerality may be explained by neutral models without invoking any evolutionary constraints of asexuality
skos:prefLabel
Let us not be unfair to asexuals: their ephemerality may be explained by neutral models without invoking any evolutionary constraints of asexuality Let us not be unfair to asexuals: their ephemerality may be explained by neutral models without invoking any evolutionary constraints of asexuality
skos:notation
RIV/67985904:_____/14:00428029!RIV15-GA0-67985904
n4:aktivita
n14:S n14:P n14:I
n4:aktivity
I, P(GA13-12580S), S
n4:cisloPeriodika
2
n4:dodaniDat
n8:2015
n4:domaciTvurceVysledku
n15:3704998
n4:druhVysledku
n18:J
n4:duvernostUdaju
n9:S
n4:entitaPredkladatele
n13:predkladatel
n4:idSjednocenehoVysledku
26026
n4:idVysledku
RIV/67985904:_____/14:00428029
n4:jazykVysledku
n17:eng
n4:klicovaSlova
age of clones; asexuality; clonal turnover
n4:klicoveSlovo
n5:clonal%20turnover n5:asexuality n5:age%20of%20clones
n4:kodStatuVydavatele
US - Spojené státy americké
n4:kontrolniKodProRIV
[DB28FA67B609]
n4:nazevZdroje
Evolution
n4:obor
n7:EG
n4:pocetDomacichTvurcuVysledku
1
n4:pocetTvurcuVysledku
1
n4:projekt
n11:GA13-12580S
n4:rokUplatneniVysledku
n8:2014
n4:svazekPeriodika
68
n4:tvurceVysledku
Janko, Karel
n4:wos
000337938600021
s:issn
0014-3820
s:numberOfPages
8
n6:doi
10.1111/evo.12293