Cariologia dei Lumbricidae II Contributo

Omodeo, Pietro Daniel

doi:10.1080/00087114.1955.10797555

Cited by 64 publications

(39 citation statements)

References 3 publications

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“…Muldal (1952) reported that there are obligatorily parthenogenetic diploid O. tyrtaeum in the British Isles but Casellato (1987) held that they are subtriploids. According to Omodeo (1955) O. tyrtaeum reproduces only parthenogenetically. He found triploid and aneuploid forms in Italy.…”

Section: Polyploidy and Reproductionmentioning

confidence: 99%

“…) and O. cyaneum (Sav.) are obligatorily parthenogenetic earthworms (Muldal, 1949(Muldal, , 1952Omodeo, 1955;Vedovini, 1973) that originate from the Palearctic (Gates, 1973;Sims & Gerard, 1985). They have an automictic parthenogenesis, in which the chromosome number is maintained through a premeiotic doubling followed by meiosis (Muldal, 1952).…”

Section: Introductionmentioning

confidence: 99%

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Clonal and morphological variation in marginal populations of parthenogenetic earthwormsOctolasion tyrtaeumandO. cyaneum(Oligochaeta, Lumbricidae) from eastern Fennoscandia

Terhivuo

Saura

1993

Bolletino di zoologia

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Clone pool diversity was studied in two parthenogenetic Octolasion species in South Finland belonging to the region of Fennoscandia where the species occur at the northern margin of their European range. In spontaneously dispersing O. tyrtaeum we recorded 24 clones (238 individuals/8 localities), but in anthropochorously dispersing O. cyaneum only two clones (134 ind./4 locs.) were found. In O. tyrtaeum the clone pools of the East ( = sample region) and the North were more similar to each other than to that in the West. Clone groups showed a clinal distribution pattern, which suggests that they may be adapted to regional environments. The low clonal heterogeneity of O. cyaneum is attributed to a small founder population and clonal drift. Morphological variability showed that characters related to reproductive organs vary extremely little in the two species. Considering somatic characters, segment number seemed to be mostly controlled by the genotype, whereas body size varied mostly according to the locality and region implying the role of environmental variables. In the North, O. tyrtaeum adults were larger than their counterparts in the East and the West.

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Section: Polyploidy and Reproductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Clonal and morphological variation in marginal populations of parthenogenetic earthwormsOctolasion tyrtaeumandO. cyaneum(Oligochaeta, Lumbricidae) from eastern Fennoscandia

Terhivuo

Saura

1993

Bolletino di zoologia

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“…Присутствие гаплотипов A. c. tra pezoides могло означать как действительную симпатрию двух подвидов, так и интрогрессию мтДНК от одного подвида к другому (случаи предполагаемой гибридизации между видами и отсутствия различий между ядерными геномами при сильно раз личающихся мтДНК встречаются нередко) (Shekhovtsov et al, 2014b(Shekhovtsov et al, , 2016bGiska et al, 2015;Martinsson et al, 2016). Заметим, что A. c. trape zoides является партеногенетичным, в отличие от A. c. caliginosa (Omodeo, 1952;Гарбар и др., 2007), но между различными его популяциями степень развития поло вой системы может варьировать от практически полноценной до полностью дегенерировавшей (Fernández et al, 2011b), т. е. вероятность хотя бы редкого обмена генами между этими подвидами в прошлом исключить нельзя. Для того, чтобы выяснить, какая из этих гипотез верна, мы просеквенировали ядерные последовательности гена гистона H3 у некоторых образцов и об наружили, что идентификация по мтДНК совпадает с таковой по ядерным генам.…”

Section: филогенетикаunclassified

Genetic diversity of the Aporrectodea caliginosa complex in Russia

Shekhovtsov¹,

Голованова²,

Bazarova³

et al. 2017

Vestn. VOGiS

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“…In some cases, the presence of rare males, new hybridization or polyploidization events and occasional sexual reproduction with closely related sexual species has been reported (Butlin et al, 1999;Lushai and Loxdale, 2002). Indeed, recent work by provides evidence that D. octaedra may not be strictly clonal even though meiotic stages have never been observed in this species (Omodeo, 1955;Terhivuo and Saura, 2006). Somatic recombination also could create new genotypes, as is known for polyploid plants (Richards, 2003).…”

Section: Introductionmentioning

confidence: 99%

“…Dendrobaena octaedra is a polyploid earthworm that reproduces by apomictic parthenogenesis (Omodeo, 1955;Terhivuo and Saura, 1990). In this type of parthenogenesis eggs are formed through mitotic division, meiotic recombination cannot occur and genotypes are transmitted intact from mother to offspring.…”

Section: Introductionmentioning

confidence: 99%

High mitochondrial DNA sequence diversity in the parthenogenetic earthworm Dendrobaena octaedra

Knott

Haimi

2010

Heredity

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Apomictic parthenogens are clonal organisms with limited genetic opportunity for increasing diversity beyond mutation. However, such species can be successful and have been shown to harbor more genetic diversity than might be expected. Here we surveyed diversity of the cytochrome oxidase subunit I gene from the mitochondrial genome of the earthworm Dendrobaena octaedra, an apomictic parthenogen. Diversity estimates made previously from allozyme markers for this species were high, but could have been affected by a detection bias, namely variable expression of alleles in the polyploid genome. We found similarly high mtDNA diversity over three localities in Finland, each represented by two sites; either with or without anthropogenic soil metal contamination. A single haplotype was most common over all sites, and over two thirds of all haplotypes sampled were similar to it in sequence (only varying by 1-3 substitutions). However, more divergent rare haplotypes were also found in one locality, Imatra, in southeast Finland close to the Karelian Isthmus. Metal contamination in the soil did not have a significant effect on genetic diversity, although metal exposure is known to be detrimental to the worms. There was no evidence for cryptic species within D. octaedra and phylogenetic analyses showed some structure of lineages that may have diverged in historical glacial refugia. Other mechanisms, such as rare genetic exchange with closely related species or high mutation and dispersal rates may explain high genetic diversity in D. octaedra.

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Cariologia dei Lumbricidae II Contributo

Cited by 64 publications

References 3 publications

Clonal and morphological variation in marginal populations of parthenogenetic earthwormsOctolasion tyrtaeumandO. cyaneum(Oligochaeta, Lumbricidae) from eastern Fennoscandia

Clonal and morphological variation in marginal populations of parthenogenetic earthwormsOctolasion tyrtaeumandO. cyaneum(Oligochaeta, Lumbricidae) from eastern Fennoscandia

Genetic diversity of the Aporrectodea caliginosa complex in Russia

High mitochondrial DNA sequence diversity in the parthenogenetic earthworm Dendrobaena octaedra

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