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Statements

Subject Item
n2:RIV%2F00216208%3A11310%2F11%3A10109115%21RIV12-MSM-11310___
rdf:type
skos:Concept n9:Vysledek
dcterms:description
Two populations of the fairy shrimp Eubranchipus grubii (Dybowski, I 860) and one population of Branchipus schaefferi Fischer, 1834 from Poland were studied cytogenetically. The aim was to confirm their diploid chromosome numbers and chromosome morphology, as well as to reveal the distribution of nucleolar organizer regions (NORs) and the course of meiosis. The first species exhibited 24 small chromosomes in both sexes, while the latter showed 2n = 20 in both males and females. In E. grubii, female meiosis involved a %22diffuse stage%22 characterized by decondensation of chromatin, and positive heteropycnosis (after staining by Giemsa) of one bivalent. The morphology of the plates of the second meiotic division suggests the chromosomes in both species are monocentric (prevailingly bi-armed). Nevertheless, constitutive heterochromatin has not been visualized by C-banding. Silver staining revealed 3 pairs of nucleolar organizer regions (NOR) in B. schaefferi, while in E. grubii the detection of NORs failed. In contrast to some previous studies reporting supernumerary chromosomes (B chromosomes) as sex ratio distorters in B. schaefferi, we failed to observe any B chromosomes in the populations under study. We suggest the fluctuation of sex ratios as found in the local populations, would rather be influenced by the environment. Two populations of the fairy shrimp Eubranchipus grubii (Dybowski, I 860) and one population of Branchipus schaefferi Fischer, 1834 from Poland were studied cytogenetically. The aim was to confirm their diploid chromosome numbers and chromosome morphology, as well as to reveal the distribution of nucleolar organizer regions (NORs) and the course of meiosis. The first species exhibited 24 small chromosomes in both sexes, while the latter showed 2n = 20 in both males and females. In E. grubii, female meiosis involved a %22diffuse stage%22 characterized by decondensation of chromatin, and positive heteropycnosis (after staining by Giemsa) of one bivalent. The morphology of the plates of the second meiotic division suggests the chromosomes in both species are monocentric (prevailingly bi-armed). Nevertheless, constitutive heterochromatin has not been visualized by C-banding. Silver staining revealed 3 pairs of nucleolar organizer regions (NOR) in B. schaefferi, while in E. grubii the detection of NORs failed. In contrast to some previous studies reporting supernumerary chromosomes (B chromosomes) as sex ratio distorters in B. schaefferi, we failed to observe any B chromosomes in the populations under study. We suggest the fluctuation of sex ratios as found in the local populations, would rather be influenced by the environment.
dcterms:title
Karyotypes and sex ratios in populations of Eubranchipus grubii (Dybowski, 1860) and Branchipus schaeferri Fischer, 1834 (Anostraca) from Poland Karyotypes and sex ratios in populations of Eubranchipus grubii (Dybowski, 1860) and Branchipus schaeferri Fischer, 1834 (Anostraca) from Poland
skos:prefLabel
Karyotypes and sex ratios in populations of Eubranchipus grubii (Dybowski, 1860) and Branchipus schaeferri Fischer, 1834 (Anostraca) from Poland Karyotypes and sex ratios in populations of Eubranchipus grubii (Dybowski, 1860) and Branchipus schaeferri Fischer, 1834 (Anostraca) from Poland
skos:notation
RIV/00216208:11310/11:10109115!RIV12-MSM-11310___
n9:predkladatel
n10:orjk%3A11310
n4:aktivita
n12:I
n4:aktivity
I
n4:cisloPeriodika
5-6
n4:dodaniDat
n17:2012
n4:domaciTvurceVysledku
n11:4357612
n4:druhVysledku
n8:J
n4:duvernostUdaju
n15:S
n4:entitaPredkladatele
n19:predkladatel
n4:idSjednocenehoVysledku
207202
n4:idVysledku
RIV/00216208:11310/11:10109115
n4:jazykVysledku
n6:eng
n4:klicovaSlova
sex ratios; meiosis; karyotypes; Eubranchipus grubii; Branchipus schaefferi
n4:klicoveSlovo
n7:sex%20ratios n7:Branchipus%20schaefferi n7:Eubranchipus%20grubii n7:karyotypes n7:meiosis
n4:kodStatuVydavatele
NL - Nizozemsko
n4:kontrolniKodProRIV
[A9F1BC03A312]
n4:nazevZdroje
Crustaceana
n4:obor
n5:EB
n4:pocetDomacichTvurcuVysledku
1
n4:pocetTvurcuVysledku
2
n4:rokUplatneniVysledku
n17:2011
n4:svazekPeriodika
84
n4:tvurceVysledku
Kořínková, Tereza Goldyn, B.
n4:wos
000293152900015
s:issn
0011-216X
s:numberOfPages
14
n13:doi
10.1163/001121611X577918
n18:organizacniJednotka
11310